Chapter 13
Piping Schematics
Piping Schematic
Level 1 Control
• Water heater
• Closed system
• Single-temperature radiant
floor heating
What to look for:
• Bypass loop – A bypass loop is
not required when using a water
heater with radiant heat.
Water Heater
Closed System
• Radiant
Low Temperature
loop circulator –
A circulator (P1) has been
added in the radiant loop. This
circulator is necessary to insureP1
flow through the radiant panel.
Where: All low-temperature
radiant applications (< 145˚F)
Why: This illustration shows a
• Isolation valves – Isolation
dedicated water heater supplying
valves are recommended at
water for a single radiant manifold.
the supply and return radiant
The water heater provides the
manifolds to facilitate purging
required supply water temperature
and service. Isolation valves or
directly to the radiant panel,
flanges are recommended at
with the water temperature
all circulators for easy service.
controlled by the water heater’s
• Pressure-relief valve – When
internal aquastat. As a result,
using a water heater as a heat
no additional water temperature
Water source, install a 30-pound relief
control device is needed.
Heater
valve in the near heat source
Important: Consult local
piping. Ensure there is NO
building codes prior to
isolation between the relief valve
installing a water heater
and the water heater.
as a heat source for
Water Heater
radiantClosed
heating.
System
ost water heaters come
M
equipped with a Temperature
and Pressure (T&P) Valve. Do
not remove this valve from the
water heater, as it provides
additional temperature safety.
• Pressure-reducing valve –
Uponor recommends installing
a pressure-reducing valve in the
fresh water makeup line to the
water heater. This is necessary
to properly set the system fill
pressure for additional safety.
• Zoning options – See
pages 127-131.
• Specific wiring schematic –
See pages 182-183.
Legend
Low Temperature
Manifold with Telestats
P1
Manifold without Telestats
Manifold with Valves
P1
Circulator
Expansion Tank
and Air Separator
Water
Heater
Ball Valve
Zone Valve
Legend
Pressure Temperature Gauge
Manifold with Telestats
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
Manifold without Telestats
Manifold with Valves
139
Piping Schematic
Level I Control
• Modulating-condensing boiler
• Single-temperature radiant
floor heating
Where: All radiant and snow
melt applications
Why: This illustration shows
a condensing boiler supplying
water to a single radiant manifold
for space heat or snow melting.
Condensing boilers are designed
to operate safely and efficiently
at low return water temperatures.
As a result, no additional water
temperature control device is
required. The boiler operating
control is set up to provide the
Condensing Boiler
correct
supply water temperature
Single
Temperature
to the radiant panel. When using
a condensing boiler in radiant and
snow melt applications, consult the
boiler manufacturer’s installation
and operation instructions
for specific near-boiler piping
information and return water
temperature limitations.
What to look for:
• Bypass loop – A bypass
loop is not required when
using a condensing boiler with
radiant heat.
• Boiler circulator – Many
condensing boilers are packaged
with an internal circulator (BP),
but require an additional system
circulator (P1). Consult the
boiler manufacturer’s installation
and operation instructions for
specific requirements. If the
boiler is equipped with a system
circulator, flow (gpm) and head
requirements for the radiant
panels may exceed the capacity
of that circulator. Review radiant
flow requirements and size the
system circulator appropriately.
• Isolation valves – Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options – See
pages 137-131.
• Specific wiring schematic –
See page 163.
Legend
Manifold with Telestats
Legend
Manifold without Telestats
Manifold with Telestats
Manifold with Valves
Manifold without Telestats
P1
Circulator
Manifold with Valves
P1
Circulator
Expansion Tank
and Air Separator
Ball Valve
Expansion Tank
and Air Separator
Ball Valve
BP
Zone Valve
P1
Pressure Temperature Gauge
Zone Valve
Pressure Temperature Gauge
Modulating-condensing Boiler
Modulating-condensing Boiler
140
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Piping Schematic
Level I Control
temperature to the radiant panel.
When using a condensing boiler in
radiant and snow melt applications,
consult the boiler manufacturer’s
installation and operation
instructions for specific near-boiler
piping information and return
water temperatures limitations.
• Modulating-condensing boiler
• Single-temperature radiant
floor heating
• Multiple manifolds
Where: All radiant and snow
melt applications
Why: This illustration shows a
condensing boiler supplying water
to multiple radiant manifolds
operating at the same supply
water temperature. Condensing
boilers are designed to operate
safely and efficiently at low return
water temperatures. As a result,
no additional water temperature
control device is required. The
boiler operating control is set up
to provide the correct supply water
Condensing Boiler
Single Temperature
Multiple Manifolds
What to look for:
• Bypass loop — A bypass loop
is not required when using
a condensing boiler with
radiant heat.
• Boiler circulator — Many
condensing boilers are packaged
with an internal circulator (BP),
but require additional system
circulators (P1). Consult the
boiler manufacturer’s installation
and operation instructions for
specific requirements. If the
boiler is equipped with a system
circulator, flow (gpm) and head
requirements for the radiant
panels may exceed the capacity
of that circulator. Review radiant
flow requirements and size the
system circulator appropriately.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options — See pages
127-131.
• Specific wiring schematic —
See pages 178-179.
Legend
Manifold with Telestats
Legend
Condensing Boiler
Single Temperature
Multiple Manifolds
Manifold without Telestats
Manifold
Manifold with
with Telestats
Valves
P1
Manifold without
Telestats
Circulator
Manifold with Valves
Expansion Tank
P1
and Air Separator
Circulator
P1
P2
BP
Ball Valve
Expansion Tank
and Air Separator
Zone Valve
P1
BP
P2
Ball Valve
Pressure Temperature Gauge
Zone Valve
Modulating-condensing Boiler
Pressure Temperature Gauge
Modulating-condensing Boiler
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
141
Piping Schematic
Level I Control
• Modulating-condensing boiler
• Dual-temperature radiant
floor heating
• Three-way tempering valve
Where: Multiple temperature
radiant applications
Legend
Manifold with Telestats
Manifold without Telestats
Why: This illustration shows a
condensing boiler supplying water
to multiple radiant panels requiring
dramatically different supply water
temperature, or having different
installation methods (i.e. concrete
vs. Joist TrakTM). Condensing
boilers are designed to operate
safely and efficiently at low return
water temperatures. As a result,
no additional water temperature
control device is required for the
higher temperature radiant. The
boiler operating control is set
up to provide the correct supply
water temperature to the high
temperature radiant panel. For the
low-temperature radiant panel,
an Uponor Three-way Tempering
Valve (T1) will mix hotter boiler
water with cooler radiant return
Condensing Boiler
water to
achieve
the
selected
3-way
Tempering
Valve
Temperature
radiantLow
supply
water temperature
High Temperature
per the valve setting (See
Chapter 12 for details on
Three-way Tempering Valve
operation). A Three-way
Tempering Valve allows the radiant
supply water temperature to be
adjusted from 80°F to 160°F.
When using a condensing boiler in
radiant applications, consult the
boiler manufacturer’s installation
and operation instructions
for specific near boiler piping
information and return water
temperature limitations.
What to look for:
• Bypass loop — A bypass
loop is not required when
using a condensing boiler with
radiant heat.
temperature, closing the hot (+)
port of the valve.
• High-temperature radiant
loop circulator — Many
condensing boilers are packaged
with an internal circulator (BP),
but require an additional system
circulator (P2). Consult the
boiler manufacturer’s installation
and operation instructions for
specific requirements. If the
boiler is equipped with a system
circulator, flow (gpm) and head
requirements for the radiant
panel may exceed the capacity
of that circulator. Review radiant
flow requirements and sized the
system circulator appropriately.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Low-temperature radiant
loop circulator — Circulators
(P1) have been added on the
radiant loop side of the Threeway Tempering Valve. This
circulator is necessary to insure
flow through the radiant panel.
Without this circulator, flow
through the radiant panel
would stop once the tempering
valve senses the supply water
has reached the desired
• Zoning options — See
pages 127-131.
• Specific wiring schematic —
See pages 178-179.
Legend
Manifold with Telestats
Manifold with Valves
Manifold without Telestats
P1
Circulator
Manifold with Valves
P1
Circulator
P1
Expansion Tank
and Air Separator
Ball Valve
Expansion Tank
and Air Separator
Ball Valve
Zone Valve
P2
BP
Zone Valve
Pressure Temperature Gauge
T1
Pressure Temperature Gaug
Modulating-condensing Boiler
Modulating-condensing Bo
142
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Piping Schematic
Level I Control
radiant applications, consult the
boiler manufacturer’s installation
and operation instructions
for specific near-boiler piping
information and return water
temperature limitations.
• Electric boiler
• Single-temperature radiant
floor heating
Where: All radiant applications
What to look for:
Why: This illustration shows an
electric boiler supplying water to
a single radiant panel. Electric
boilers are designed to operate
safely and efficiently at low return
water temperatures. As a result,
no additional water temperature
control device is required. The
boiler high limit is set to provide
the
maximum
supply water
Electric
Boiler
Single Temperature
temperature
to the radiant panel.
When using an electric boiler in
• Bypass loop — A bypass loop
is not required when using an
electric boiler with radiant heat.
• Boiler circulator — Electric
boilers are not typically packaged
with a circulator, and therefore
require the installation of a
system circulator (P1). Review
radiant flow requirements
(gpm and head) and size the
system circulator appropriately.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at
all circulators for easy service.
• Zoning options — See
pages 127-131.
• Specific wiring schematic —
See page 163.
Legend
Manifold with Telestats
Manifold without Telestats
Manifold with Valves
P1
Legend
P1
Circulator
Manifold with Telestats
Electric Boiler
Single Temperature
Expansion
Tank Telestats
Manifold
without
and Air Separator
Manifold
with Valves
Ball Valve
P1
P1
Circulator
Zone Valve
Pressure Temperature Gauge
Expansion Tank
and Air Separator
Ball Valve
Electric Boiler
Zone Valve
Pressure Temperature Gauge
Electric Boiler
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
143
Piping Schematic
Level I Control
• Electric boiler
• Single-temperature radiant
floor heating
• Multiple manifolds
Where: All radiant applications
Why: This illustration shows
an electric boiler supplying
water to multiple radiant panels
operating at the same supply
water temperature. Electric boilers
are designed to operate safely
and efficiently at low return
water temperatures. As a result,
no additional water temperature
control device is required. The
Electric Boiler
Single Temperature
Multiple Manifolds
boiler high limit is set to provide
the maximum supply water
temperature to the radiant panel.
When using an electric boiler in
radiant applications, consult the
boiler manufacturer’s installation
and operation instructions
for specific near-boiler
piping information.
What to look for:
• Bypass loop — A bypass loop
is not required when using an
electric boiler with radiant heat.
• Boiler circulator — Electric
boilers are not packaged with a
circulator, and therefore require
the installation of additional
system circulators (P1 and P2).
Review radiant flow requirements
(gpm and head) and size the
system circulators appropriately.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options — See pages
127-131.
• Specific wiring schematic See pages 178-179.
Legend
Manifold with Telesta
Legend
P1
Manifold without Telest
Manifold with Telestats
Manifold with Valves
Manifold without Telestats
P1
Circulator
Manifold with Valves
P2
P1
Circulator
Expansion Tank
and Air Separator
Ball Valve
Expansion Tank
and Air Separator
Zone Valve
Ball Valve
Pressure Temperature Ga
Zone Valve
Electric Boiler
Pressure Temperature Gauge
Electric Boiler
144
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Piping Schematic
Level I Control
using an electric boiler in radiant
applications, consult the boiler
manufacturer’s installation and
operation instructions for specific
near boiler piping information
and return water temperature
limitations.
• Electric boiler
• Multiple-temperature
radiant floor heating
• Three-way tempering valve
Where: Multiple temperature
radiant applications
What to look for:
• Bypass loop — A bypass loop
Why: This illustration shows an
is not required when using an
electric boiler supplying water to
electric boiler with radiant heat.
multiple radiant panels requiring
dramatically different supply
• Low-temperature radiant
water temperatures, or having
loop circulator — A circulator
different installation methods
(P1) has been added on the
(i.e. concrete vs. Joist Trak).
radiant loop side of the ThreeElectric boilers are designed to
way Tempering Valve. This
operate safely and efficiently at
circulator is necessary to insure
low return water temperatures.
flow through the radiant panel.
As a result, no additional water
Without this circulator,
temperature control device is
flow through the radiant panel
required for the higher temperature
would stop once the Three-way
radiant. The boiler high limit is
Tempering Valve senses the
set to provide the maximum
supply water has reached the
supply water temperature
to
the
desired temperature, closing the
Electric Boiler
Electric
Boiler
3-Way
Tempering Valve hot (+) port of the valve.
high temperature radiant
panel.
3-Way
Valve
LowTempering
Temperature
For the low temperature
radiant
LowHigh
Temperature
Temperature
High Temperature
panel, an Uponor Three-way
Tempering Valve is used to mix
hot boiler water with cooler
radiant return water to achieve
the selected radiant supply water
temperature per the valve setting
(see Chapter 12 for details on
Three-way Tempering Valve
operation). A Three-way Tempering
Valve allows the radiant supply
water temperature to be adjusted
from 80°F to 160°F. When
T1
T1
• High-temperature radiant
loop circulator ­— Electric
boilers are not packaged with
circulators, and therefore
require an additional system
circulator (P2). Consult the boiler
manufacturer’s installation and
operation instructions for specific
requirements. Review radiant
flow requirements and size the
system circulator appropriately.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options — See
pages 127-131.
• Specific wiring schematic —
See pages 178-179.
Legend
Legend
P2
P2
Manifold with Telestats
Manifold with Telestats
Manifold without Telestats
Manifold without Telestats
Manifold with Valves
Manifold with Valves
P1
P1
P1
Circulator
P1
Circulator
Expansion Tank
and AirTank
Separator
Expansion
and Air Separator
Ball Valve
Ball Valve
Zone Valve
Zone Valve
Pressure Temperature Gauge
Pressure Temperature Gauge
Electric Boiler
Electric Boiler
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
145
Piping Schematic
Level II Control
• Non-condensing boiler
• Three-way tempering valve
Where: All low-temperature
radiant applications (< 160° F)
Legend
Manifold with Telestats
Why: This illustration shows a
non-condensing boiler supplying
water to a single radiant panel.
The Uponor Three-way Tempering
Valve (T1) is used to mix hot boiler
water with cooler radiant return
water to achieve the selected
radiant supply water temperature
per the valve setting (see
Chapter 12 for details on
Three-way Tempering Valve
operation). In low-temperature
(< 160°F) radiant heating
applications using a noncondensing boiler, the boiler
supply water temperature must
be reduced to the proper radiant
supply water temperature. A
Three-way Tempering Valve
allows the radiant supply water
temperature to be adjusted from
80°F to 160°F.
Non Condensing Boiler
3-Way Tempering Valve
What to look for:
r adiant supply water does
not reach the desired
temperature, continue to close
the valve in small increments
until that temperature is reached.
• Bypass loop — This piping
schematic includes a
“bypass” loop at the boiler.
Non-condensing boilers
require minimum return water
temperatures of 140°F or higher
(see boiler manufacturer’s
installation instructions for
specific requirements) to prevent
flue gas condensation, potential
internal corrosion, and potential
thermal shock. The bypass loop
allows an amount of hot boiler
water (depending on bypass
valve position) to circulate
through the boiler to maintain
return water temperatures
above the minimum, preventing
the boiler’s flue gasses from
condensing. Condensed flue
gasses are highly corrosive and
will shorten the boiler’s life and
may void the boiler’s warranty.
The bypass valve (V1) should
never be left in the full open
position during normal operation.
• Radiant loop circulator — A
circulator (P1) has been added
on the radiant loop side of the
Three-way Tempering Valve.
This circulator is necessary to
insure flow through the radiant
panel. Without this circulator,
flow through the radiant panel
would stop once the Three-way
Tempering Valve senses the
supply water has reached the
desired temperature, closing the
hot (+) port of the valve.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options —
See pages 127-131.
• Bypass valve setting —
At system startup, position
a suitable valve (V1) in the
half-open position. If the
• Specific wiring schematic —
See page 163.
Legen
Manifold with
Manifold without Telestats
Manifold withou
Manifold with Valves
P1
Manifold with
P1
Circulator
P1
Circulato
T1
Expansion Tank
and Air Separator
V1
Expansion T
and Air Sepa
Ball Valve
Ball Valv
Zone Valve
BP
Zone Val
Pressure Temperature Gauge
Pressure Tempera
Non-condensing Boiler
Non-condensin
146
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Non-condensing boiler
Three-way tempering valves
Dual temperature radiant floor heating
Legend
Piping Schematic
Level II Control
• Non-condensing boiler
• Three-way tempering valve
• Dual-temperature radiant
floor heating
Where: All low-temperature
radiant applications (< 160°F)
Why: This illustration shows a
non-condensing boiler supplying
water to a multiple radiant panels
requiring dramatically different
supply water temperatures, or
having different installation
methods (i.e. concrete vs. Joist
Trak). The Uponor Three-way
Tempering Valves (T1 and T2)
will mix hot boiler water with
cooler radiant return water to
achieve the selected radiant supply
water temperatures per the valve
settings (see Chapter 12 for
details on Three-way Tempering
Valve operation).
In low-temperature (< 160°F)
radiant heating applications using
a non-condensing boiler, the boiler
supply water temperature must
be reduced to the proper radiant
supply water temperature. A
Three-way Tempering Valve
allows the radiant supply water
temperature to be adjusted from
80°F to 160°F.
return water temperatures
above the minimum, preventing
the boiler’s flue gasses from
condensing. Condensed flue T1
gasses are highly corrosive and
will shorten the boiler’s life and
may void the boiler’s warranty.
The bypass valve (V1) should
never be left in the full open
position during normal operation.
• Bypass valve setting —
At system startup, position aT2
suitable valve
(V1) in the halfV1
open position. If the radiant
supply water does not reach
the desired temperature,
continue to close the valve
in small increments until that
temperature is reached.
P1
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at
all circulators for easy service.
• Zoning options —
P2
See pages 127-131.
• Specific Wiring Schematic —
See pages 178-179.
Manifold with Valves
P1
Circulator
Expansion Tank
and Air Separator
Zone Valve
Pressure Temperature Gauge
Non-condensing Boiler
Legend
P1
Manifold with Telestats
Manifold without Telestat
T1
Manifold with Valves
P1
Circulator
P2
What to look for:
• Bypass loop — This piping
schematic includes a “bypass”
loop at the boiler. Noncondensing boilers require
minimum return water
temperatures of 140°F or higher
(see boiler manufacturer’s
installation instructions for
specific requirements) to prevent
flue gas condensation, potential
internal corrosion, and potential
thermal shock. The bypass loop
allows an amount of hot boiler
water (depending on bypass
valve position) to circulate
through the boiler to maintain
Complete Design Assistance Manual
Manifold without Telestats
Ball Valve
BP
• Radiant loop circulator —
Circulators (P1 and P2) have
been added on the radiant
boiler
loopNon-condensing
sides of each
ThreeThree-way tempering valves
way Dual
Tempering
Valve.
These
temperature radiant floor
heating
circulators are necessary to
insure flow through the radiant
panels. Without these circulators,
flow through the radiant panels
would stop once the Three-way
Tempering Valves sense the
supply water has reached the
desired temperature, closing
the hot (+) port of the valve.
Manifold with Telestats
—
T2
Expansion Tank
and Air Separator
V1
Ball Valve
Zone Valve
BP
Pressure Temperature Gaug
Non-condensing Boiler
Chapter 13 – Piping Schematics
147
Piping Schematic
Level II Control
• Non-condensing boiler
• Three-way tempering valve
• Dual-temperature radiant
floor heating
• High-temperature radiation
Where: All low-temperature
radiant applications (< 160°F),
with high-temperature radiation
Why: This illustration shows a
non-condensing boiler supplying
water to multiple radiant panels
requiring dramatically different
supply water temperatures or
having different installation
methods (i.e. concrete vs. Joist
Trak) plus high-temperature
radiation (baseboard, panel
radiators, fan coils, etc.). The
Uponor Three-way Tempering
Valves (T1 and T2) are used to
mix hot boiler water with cooler
radiant return water to achieve
the selected radiant supply water
temperature per the valve settings
(see Chapter 12 for details on
Three-way Tempering Valve
operation). In low-temperature
(< 160°F) radiant heating
applications using a noncondensing boiler, the boiler
supply water temperature must
be reduced to the proper radiant
supply water temperature. A
Three-way Tempering Valve
allows the radiant supply water
temperature to be adjusted
from 80°F to 160°F. The hightemperature radiation is supplied
directly with boiler water.
148
What to look for:
• Bypass loop — This piping
schematic includes a “bypass”
loop at the boiler. Noncondensing boilers require
minimum return water
temperatures of 140°F or higher
(see boiler manufacturer’s
installation instructions for
requirements) to prevent flue gas
condensation, potential internal
corrosion, and potential thermal
shock. The bypass loop allows
an amount of hot boiler water
(depending on bypass valve
position) to circulate through
the boiler to maintain return
water temperatures above the
minimum, preventing the boiler’s
flue gasses from condensing.
Condensed flue gasses are highly
corrosive and will shorten the
boiler’s life and may void the
boiler’s warranty. The bypass
valve (V1) should never be left
in the full open position during
normal operation.
• Bypass valve setting —
At system startup, position a
suitable valve (V1) in the halfopen position. If the radiant
supply water does not reach
the desired temperature,
continue to close the valve
in small increments until that
temperature is reached.
• Radiant loop circulator —
Circulators (P1 and P2) have
been added on the radiant
loop sides of the Three-way
Tempering Valves (T1 and T2).
These circulators are necessary to
insure flow through the radiant
panels. Without these circulators,
flow through the radiant panels
would stop once the Three-way
Tempering Valves sense the
supply water has reached the
desired temperatures, closing the
hot (+) port of the valves.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at
all circulators for easy service.
• Baseboard zone control —
In this schematic, the baseboard
loop(s) are controlled with a
zone valve (M1), which
operates independently of
the radiant heat.
• Zoning options —
See pages 127-131.
• Specific Wiring Schematic —
See pages 174-175.
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Non-condensing boiler
Three-way tempering valves
Dual temperature radiant floor heating
High temperature radiation
Legend
Manifold with Telestats
Non-condensing boiler
Three-way tempering valves
Dual temperature radiant floor heating
High temperature radiation
Legend
P1
Manifold without Telestats
Manifold with Telestats
Manifold with Valves
T1
P1
Manifold without Telestats
P1
Circulator
Manifold with Valves
T1
P2
M1
P1
Circulator
Expansion Tank
and Air Separator
P2
T2
M1
V1
Ball Valve
Expansion Tank
and Air Separator
T2
V1
Ball Valve
Zone Valve
Zone Valve
BP
Pressure Temperature Gauge
BP
Pressure Temperature Gauge
Non-condensing Boiler
Non-condensing Boiler
Baseboard
Baseboard
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
149
Piping Schematic
Level II Control
• Non-condensing boiler
• Heat exchanger
Where: All radiant and snow
melt applications
Why: This illustration shows a
non-condensing boiler supplying
water to a heat exchanger (HX1) to
provide water temperature control
and isolation where necessary.
Water temperature for the radiant
panel or snow melt system is
controlled by a sensor (S1),
either immersion type or strapon type, placed on the supply
outlet of the heat exchanger.
The sensor is wired to a set-point
controller or aquastat, which is
set for the desired supply water
temperature. When the supply
water temperature drops below
the desired level, the set-point
controller or aquastat will fire the
boiler circulator and/or boiler to
send hot water through the boiler
side of the heat exchanger. The
radiant supply water temperature
will increase until the desired level
is reached, shutting off the boiler
circulator and/or boiler. Besides
controlling water temperature, a
heat exchanger can be used for
isolating the boiler and its ferrous
(corrodible) components when
Uponor AquaPEX (non-barrier)
tubing is used on the radiant
or snow melt side of the heat
exchanger. A heat exchanger
will also protect non-condensing
boilers from thermal shock and low
return water temperatures, and
allows for glycol to be added to the
radiant/snow melt portion of the
system only.
150
What to look for:
• Bypass loop — This piping
schematic includes a “bypass”
loop at the boiler. Noncondensing boilers require
minimum return water
temperatures of 140°F or higher
(see boiler manufacturer’s
installation instructions for
specific requirements) to
prevent flue gas condensation,,
and potential thermal shock
potential internal corrosion.
The bypass loop allows an
amount of hot boiler water
(depending on bypass valve
position) to circulate through
the boiler to maintain return
water temperatures above the
minimum, preventing the boiler’s
flue gasses from condensing.
Condensed flue gasses are highly
corrosive and will shorten the
boiler’s life and may void the
boiler’s warranty. The bypass
valve (V1) should never be left
in the full open position during
normal operation.
• Expansion tank — An
expansion tank and air separator
are added to the radiant/snow
melt side of the heat exchanger.
This is required for proper
air elimination and thermal
expansion due to isolation
from the boiler loop by the
heat exchanger.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options —
See pages 127-131.
• Specific wiring schematic —
See page 163.
• Bypass valve setting —
At system startup, position
a suitable valve (V1) in the
half-open position. If the radiant
supply water does not reach the
desired temperature, continue
to close the valve in small
increments until that temperature
is reached.
• Radiant loop circulator — A
circulator (P1) has been added
on the radiant loop side of the
heat exchanger (HX1). This
circulator is necessary to insure
flow through the radiant panel.
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Legend
Non-condensing boiler
Heat exchanger
Manifold with Telestats
HX1
S1
Manifold without Telestats
P1
Manifold with Valves
V1
P1
Circulator
Expansion Tank
and Air Separator
BP
Legend
Ball Valve
ndensing boiler
changer
Manifold with Telestats
Zone Valve
HX1
S1
Manifold without Telestats
Pressure Temperature Gauge
P1
Manifold with Valves
V1
P1
Circulator
Non-condensing Boiler
Expansion Tank
and Air Separator
BP
Ball Valve
Zone Valve
Pressure Temperature Gauge
Non-condensing Boiler
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
151
Piping Schematic
Level II Control
What to look for:
• Wood boiler
• Mixing tank
• Single-temperature radiant
floor heating
Where: All radiant applications
Legend
Manifold with Telestats
Manifold without Telestats
Why: This illustration shows a
wood boiler supply water for
a single radiant panel, using a
mixing, or “buffer”, tank as a
tempering device. The wood
boiler supplies hot boiler water
to the tank that will mix with the
cooler radiant return water to
deliver the proper radiant supply
water temperature. An aquastat
(AQ1), either an immersion type
or strap-on type, controls the tank
temperature. When the aquastat
senses the radiant supply water
temperature has dropped below
the desired level, it starts the boiler
pump (P1), mixing hot boiler water
into the tank until the desired
temperature has been reached.
In all radiant applications using a
wood boiler, a buffer tank must be
used to control the radiant supply
water temperature, and to protect
Non-condensing
boiler excessive
the radiant
panel from
Buffer tank
boiler water
temperatures.
Single-temperature
• Bypass loop — This piping
schematic includes a “bypass”
loop at the boiler. The
installation of a bypass will allow
an amount of hot boiler supply
water (depending on bypass
valve position) to circulate
through the boiler to prevent low
boiler return water temperatures,
preventing the boiler’s flue
gasses from condensing.
Condensed flue gasses are highly
corrosive and will shorten the
boiler’s life and may void the
boiler’s warranty. The bypass
valve (V1) should never be left
in the full open position during
normal operation.
• Bypass valve setting —
At system startup, position
a suitable valve (V1) in the
half-open position. If the
radiant supply water does not
reach the desired temperature,
continue to close the valve
in small increments until that
temperature is reached.
• Radiant loop circulator —
A circulator (P1) has been added
on the radiant loop side of the
buffer tank. This circulator is
necessary to insure flow through
the radiant panel.
• Aquastat — An aquastat (AQ1)
is used to sense and control
water temperature inside the
buffer tank. The aquastat is set
to the desired radiant supply
water temperature, and is wired
to a relay that controls the boiler
circulator (P1).
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at
all circulators for easy service.
• Zoning options —
See pages 127-131.
• Specific wiring schematic —
See pages 180-181.
Legend
Manifold with Telestats
Manifold without Telestats
Manifold with Valves
Manifold with Valves
P1
Circulator
V1
Expansion Tank
and Air Separator
P1
Circulator
AQ1
Ball Valve
Buffer Tank
Expansion Tank
and Air Separator
P1
BP
Ball Valve
Zone Valve
Zone Valve
Pressure Temperature Gauge
Pressure Temperature Gaug
Non-condensing Boiler
Non-condensing Boiler
152
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Piping Schematic
Level II Control
tank temperature. When the
aquastat senses the radiant supply
water temperature has dropped
below the desired level, it starts
the heat pump circulator (P1),
mixing warmer heat pump water
into the tank until the desired
temperature has been reached.
Some geothermal manufacturers
make buffer tanks and controls
available for their equipment in
radiant applications. Refer to the
manufacturer’s installation and
operation instructions for specifics.
• Heat pump
• Mixing tank
• Single-temperature radiant
floor heating
Where: All low-temperature
radiant applications (< 120°F)
Why: This illustration shows a
geo-thermal heat pump supplying
water for a single radiant panel,
using a mixing, or “buffer”,
tank as a tempering device. The
geo-thermal heat pump supplies
warm water to the tank that will
mix will cooler radiant return water
to deliver the proper radiant supply
water temperature. An aquastat
(AQ1),
either an immersion type
Heat Pump
or
strap-on
type, controls the
Buffer
Tank
What to look for:
• Radiant loop circulator —
A circulator (P1) has been added
on the radiant loop side of the
buffer tank. This circulator is
necessary to insure flow through
the radiant panel.
Single Temperature
• Aquastat — An aquastat (AQ1)
is used to sense and control
water temperature inside the
buffer tank. The aquastat is set
to the desired radiant supply
water temperature, and is wired
to a relay that controls the
system circulator (P1).
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options —
See pages 127-131.
• Specific wiring schematic —
See pages 180-181.
Legend
Manifold with Telestats
Manifold without Telestats
Legend
Manifold with
Valves
P1
Circulator
Manifold with Telestats
Heat Pump
Buffer Tank
Single Temperature
AQ1
Buffer Tank
P1
Manifold without Telestats
Expansion Tank
and Air Separator
Manifold with Valves
Ball Valve
P1
Circulator
HPP
Zone Valve
AQ1
Buffer Tank
P1
Expansion Tank
and Air Separator
Pressure Temperature
Gauge
Ball Valve
HPP
Heat Pump
Zone Valve
Pressure Temperature Gauge
Heat Pump
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
153
Piping Schematic
Level III Control
• Non-condensing boiler
• Three-way modulating valve
• Single-temperature radiant
floor heating
Where: All radiant and hydronic
applications where full outdoor
reset with a weather-responsive
reset control is desirable
Why: This illustration shows a
non-condensing boiler supplying
water to a single radiant panel.
The radiant loop supply water
temperature is controlled by
the use of the Climate Cŏntrol
Multifunction Controller and
Three-way Modulating Valve.
The Multifunction Controller is a
weather-responsive reset controller
that senses changes in outdoor
temperatures and adjusts the
radiant supply water temperature
accordingly, while providing
adequate heat to satisfy the
structure’s heat loss requirements
(see Chapter 12 for further
information on weather responsive
reset control). The Multifunction
Controller also controls the
radiant loop circulator and the
boiler loop circulator, and also
enables the boiler.
154
What to look for:
• Bypass loop — This piping
schematic includes a “bypass”
loop at the boiler. Noncondensing boilers require
minimum return water
temperatures of 140°F or higher
(see boiler manufacturer’s
installation instructions for
specific requirements) to prevent
flue gas condensation and
potential internal corrosion. The
bypass loop allows an amount
of hot boiler water (depending
on bypass valve position and
Three-way Modulating Valve
position) to circulate through
the boiler to maintain return
water temperatures above the
minimum, preventing the boiler’s
flue gasses from condensing.
Condensed flue gasses are highly
corrosive and will shorten the
boiler’s life and may void the
boiler’s warranty. The bypass
valve (V1) should never be left
in the full open position during
normal operation.
• Bypass valve setting —
At system startup, position a
suitable valve (V1) in the
half-open position. If the
radiant supply water does not
reach the desired temperature,
continue to close the valve
in small increments until that
temperature is reached.
• Radiant loop circulator — A
circulator (P2) has been added
on the radiant side of the
Three-way Modulating Valve
(MV1). This circulator is
necessary to insure adequate
flow through the radiant panel.
Without this circulator, flow
through the radiant panel would
vary based on the position of the
Three-way Modulating Valve.
• Sensors — Strap-on sensors
(S1 and S2) are placed on the
piping between the MIX port
of the Three-way Modulating
Valve and the radiant manifolds,
on the boiler return piping (S3)
near the boiler return inlet, and
outdoors (OAS) on the north side
of the structure, preferably out
of direct sunlight.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options —
See pages 127-131.
• Specific Wiring Schematic —
See pages 186-187.
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Legend
Non-condensing boiler
Three-way modulating valve
Manifold with Telestats
S1
Manifold without Telestats
Legend
P1
Manifold with Valves
Non-condensing boiler
Three-way modulating valve
S2
S1
Manifold with Telestats
P1
Circulator
Manifold without Telestats
P1
Manifold
with
Valves
Expansion
Tank
and Air Separator
BP
OAS
S2
Place outdoor sensor
above the snow line
on north-facing wall
P1
Circulator
Ball
Valve
Zone Valve
Expansion Tank
and Air Separator
BP
OAS
Place outdoor sensor
above the snow line
on north-facing wall
Pressure Temperature Gauge
Ball Valve
Zone ValveBoiler
Non-condensing
Pressure Temperature Gauge
Three-way Modulating
Valve (0-10v)
Non-condensing Boiler
Three-way Modulating
Valve (0-10v)
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
155
Piping Schematic
Level III Control
• Non-condensing boiler
• Dual-temperature radiant
floor heating
• Variable-speed injection mixing
Where: All radiant and other
hydronic applications where two
separate temperatures of full
outdoor reset with a weatherresponsive control is desirable,
using primary/secondary piping
Why: This illustration shows a noncondensing boiler supplying water
to multiple radiant panels requiring
dramatically different supply water
temperatures, or having different
installation methods (i.e. concrete
vs. Joist Trak). The Climate
Cŏntrol Multifunction Controller
separately controls the radiant loop
temperatures based on outdoor
temperatures. The controller
senses changes in outdoor weather
conditions and changes the supply
water temperatures in each radiant
manifold independently using
variable-speed injection mixing
(see Appendix I for information
on variable-speed injection mixing),
while providing adequate heat to
satisfy the structure’s heat loss
requirements (see Chapter 12 for
further information on weatherresponsive reset controls). The
Multifunction Controller controls
each radiant loop circulator (SP1
and SP2) independently based on
calls for heat, and varies the speed
of each injection circulator (IP1 and
IP2) based on the required supply
water temperature for each radiant
loop. The Multifunction Controller
also enables the boiler and fires the
primary circulator (PP1).
156
What to look for:
• Bypass loop — Even though a
non-condensing boiler is used in
this applications, an additional
bypass loop is not required.
The Primary loop will suffice
as a bypass loop. The Climate
Cŏntrol Multifunction Controller
uses primary sensors (S5 and
S6) to provide boiler operation,
maintaining return water
temperatures above the boiler
manufacturer’s recommended
minimum and preventing
flue gas condensation in
non-condensing boilers.
• Primary loop circulator —
The primary circulator (BP)
should be sized to meet the flow
(gpm) demands of the entire
heating system. The primary
pump head should be sized to
the pressure drop of the primary
loop only, plus associated valves
and fittings.
• Radiant loop circulators
— These circulators (SP1
and SP2) have been added to
the secondary loops. These
circulators are necessary to insure
flow through the radiant panels.
These are considered secondary
circulators, and should be sized
to the flow (gpm) and head loss
of the secondary loops only.
• Injection circulators — These
circulators (IP1 and IP2) are
used to inject hot water from
the primary boiler loop into the
secondary radiant loops. Based
on input from the Multifunction
Controller, the speed of the
circulators will vary. This variable
speed injection mixing will
change the radiant supply water
temperature based on outdoor
weather conditions.
• Thermal traps — Thermal
traps are required in the injection
piping to prevent thermal
migration of hot water from
the Primary loop into the
secondary loops, possibly
effecting radiant supply water
temperature control.
• Balancing valves — Balancing
valves (BV1 and BV2) are
required on the return legs
of the injection piping to
balance flow through the
injection legs and to maximize
circulator operation.
• Tee spacing — Spacing
between supply and return
tees off the boiler primary loop
and off the secondary loop
should not exceed 6 inches.
This will eliminate pressure
drop between the tees. As a
result, flow will only occur in
the secondary loop when the
secondary circulator is
in operation.
• Sensors — Strap-on sensors
(S1 and S2) are placed on the
boiler supply and return piping
near the boiler, on the secondary
radiant loops (S3 through S6)
and outdoors (OAS) on the north
side of the structure, preferably
out of direct sunlight.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options —
See pages 127-131.
• Specific wiring Schematic —
See pages 188-189.
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Non-condensing boiler
Three-way modulating valve
Legend
S3
Non-condensing boiler
Three-way modulating valve
Manifold with Telestats
Legend
SP2
OAS
S4 S3
1
Manifold without Telestats
Manifold with Telestats
SP2
2
IP1
OAS
S4
1
2
IP1
S1
Note:
• Spacing between tees not to exceed 6"
• Thermal trap minimum 12"
1
1
S1
Note:
• Spacing between tees not to exceed 6"
• Thermal trap minimum 12"
1
S2
2
BV2
P1
S2
1
IP2
Place outdoor sensor
above the snow line
on north-facing wall
Place outdoor sensor
above the snow line
on north-facing wall
Manifold with Valves
Manifold without Telestats
P1
Circulator
Manifold with Valves
P1
Circulator
Expansion Tank
and Air Separator
Ball Valve
Expansion Tank
and Air Separator
S5
2
BV2 1
IP2
Zone Valve
Ball Valve
SP2
S6 S5
P1
1
Pressure Temperature Gauge
Zone Valve
SP2
S6
Pressure Temperature Gauge
Non-condensing Boiler
Non-condensing Boiler
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
157
Piping Schematic
Level III Control
• Non-condensing boiler
• Multiple-temperature
radiant floor heating and
snow melting
• Variable-speed injection mixing
Where: All single-temperature
radiant floor heating or other
hydronic applications, plus
integrated snow melting where
full outdoor reset with a weatherresponsive control is desirable,
using primary/secondary piping.
Why: This illustration shows a
non-condensing boiler supplying
water to a single radiant panel.
The Climate Cŏntrol Multifunction
Controller controls the radiant
loop temperature. The controller
senses changes in outdoor
weather conditions and changes
the supply water temperature in
the radiant loop using variablespeed injection mixing (see
Appendix I for information on
variable-speed injection mixing),
while providing adequate heat
to satisfy the structure’s heat
loss requirements (see Chapter
12 for further information on
weather-responsive reset controls).
The Multifunction Controller
also controls an integrated
snow melting system, using
variable-speed injection mixing in
conjunction with a heat exchanger
(HX1). The Multifunction
Controller controls the radiant and
snow melt circulators (SP1 and
SP2) independently based on calls
for heat, and varies the speed of
each injection circulator (IP1 and
IP2) independently, based on the
required supply water temperatures
for the radiant and snow melt
loops. The Multifunction Controller
also enables the boiler and fires the
primary circulator (P1).
158
What to look for:
• Bypass loop — Even though a
non-condensing boiler is used
in this application, an additional
bypass loop is not required. The
primary loop will suffice as a
bypass loop. The Multifunction
Controller uses boiler sensors
(S1 and S2) to provide boiler
operation, maintaining return
water temperatures above
the boiler manufacturer’s
recommended minimum and
preventing flue gas condensation
in non-condensing boilers.
• Primary loop circulator —
The primary circulator (BP)
should be sized to meet the flow
(gpm) demands of the entire
heating system. The primary
pump head should be sized to
the pressure drop of the primary
loop only, plus associated valves
and fittings.
• Radiant and snow melt loop
circulators — Circulators (SP1
and SP2) have been added to
the secondary loops. These
circulators are necessary to insure
flow through the radiant panels.
These are considered secondary
circulators and should be sized
to the flow (gpm) and head loss
of the secondary loops only.
• Injection circulators —
These circulators (IP1 and IP2)
are used to inject hot water from
the primary boiler loop into
the secondary radiant loops.
Based on input from the
Climate Cŏntrol Multifunction
Controller, the speed of these
circulators will vary. This
variable-speed injection mixing
will change the radiant and snow
melt supply water temperatures
based on outdoor weather
conditions (see Appendix I for
injection pump sizing).
• Thermal traps — Thermal traps
are required in the injection
piping to prevent thermal
migration of hot water from
the primary loop into the
secondary loops, possibly
affecting radiant supply water
temperature control (see
Appendix I for variable-speed
injection mixing piping detail).
• Balancing valves —
Balancing valves (BV1 and BV2)
are required on the return
legs of the injection piping
to balance flow through the
injection legs and to maximize
circulator operation.
• Tee spacing — Spacing
between supply and return
tees off the boiler primary loop
and off the secondary loops
should not exceed 6 inches.
This will eliminate pressure
drop between the tees. As a
result, flow will only occur in
the secondary loop when
the secondary circulator is
in operation.
• Sensors — Strap-on sensors
(S1 and S2) are placed on the
boiler piping near the boiler, on
the secondary radiant/snow melt
loops (S3 through S6) between
the secondary loop circulators
and the radiant manifolds, and
outdoors (OAS) on the north side
of the structure, preferably out
of direct sunlight.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Non-condensing boiler
Radiant floor heating and snow melting
Injection pumping
Dual temperature
Legend
S3
Non-condensing boiler
Radiant floor heating and snow melting
Injection pumping
Dual temperature
Manifold with Telestats
SP2
Legend
S4
1
S3
Manifold without Telestats
Manifold with Telestats
SP2
OAS
2
IP1
S4
1
Manifold with Valves
Manifold without Telestats
P1
Circulator
OAS
Place outdoor sensor
above the snow line
on north-facing wall
2
IP1
S1
1
1
S1
S2
Note:
• Spacing between tees not to exceed 6"
• Thermal trap minimum 12"
1
2
BV2
1
2
Note:
• Spacing between tees not toS5
exceed 6"
• Thermal trap minimum 12"
IP2
BV2
SP2
Ball Valve
Ball Valve
Zone Valve
S5
SP2
S6
• Expansion tank — An
expansion tank and air separator
are added to the snow melt
side of the heat exchanger.
This allows for proper air
elimination and thermal
expansion, as the snow melt
loop is isolated from the boiler
loop by the heat exchanger.
Zone Valve
Pressure Temperature Gauge
S6
HX1
P1
P1
ExpansionCirculator
Tank
and Air Separator
Expansion Tank
and Air Separator
IP2
HX1
P1S2
Place outdoor sensor
above the snow line
on north-facing wall
Manifold with Valves
Pressure Temperature
Non-condensing
Boiler Gauge
Non-condensing Boiler
• Zoning options —
See pages 127-131.
• Specific wiring Schematic —
See pages 190-191.
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
159
Piping Schematic
Level III Control
• Non-condensing boiler
• Three-way modulating valve
• Dual-temperature radiant
floor heating
• High-temperature radiation
• Domestic hot water
• Primary/secondary piping
Where: All low-temperature
radiant applications (< 160°F),
with high-temperature radiation
and indirect domestic hot water
using primary/secondary piping
Why: This illustration shows a
non-condensing boiler supplying
water to multiple radiant panels
requiring dramatically different
supply water temperatures or
having different installation
methods (i.e. concrete vs. Joist
Trak) plus high temperature
radiation (base board, panel
radiators, fan coils, etc.) and an
indirect hot water tank using a
single pipe primary/secondary
boiler piping arrangement. All
elements are controlled by the
Climate Cŏntrol Multifunction
Controller. The Three-way
Modulating Valves (MV1 and
MV2) are used to mix hot boiler
water from the primary loop with
cooler radiant return water from
the secondary loop to achieve
the selected radiant supply water
temperature per the valve settings.
The radiant panel loop(s) become
the secondary piping. Hot boiler
water off the primary boiler loop
will feed the Secondary loops
for both the high- temperature
radiation and the domestic hot
water tank. Primary/secondary
boiler piping allows for simplified
piping in multiple temperature
applications, protects the
boiler against low return water
temperature, possible flue gas
condensation and possible short
cycling. In low-temperature
(< 160°F) radiant heating
160
applications using a non-condensing
boiler, the boiler supply water
temperature must be reduced
to the proper radiant supply
water temperature. A Three-way
Modulating Valve allows the
radiant supply water temperature
to be mixed from 80°F to 160°F.
The high-temperature radiation is
supplied directly with boiler water.
What to look for:
• Bypass loop — Even though a
non-condensing boiler is used
in this application, an additional
bypass loop is not required.
The primary loop will suffice
as the bypass loop and will
protect the boiler.
• Primary loop circulator —
The primary circulator (PP)
should be sized to meet the flow
(gpm) demands of the entire
heating system. The primary
pump head should be sized to
the pressure drop of the primary
loop only, plus associated valves
and fittings.
• Radiant loop circulator —
Circulators (SP1 and SP2) have
been added on the radiant
loop side of the Three-way
Modulating Valves (MV1 and
MV2). These circulators are
necessary to insure flow through
the radiant panels. Without
these circulators, flow through
each radiant panel would stop
once the Three-way Modulating
Valves sense the supply water
has reached the desired
temperatures, closing the hot
(+) port of the valves. These are
considered secondary circulators,
and should be sized to the flow
(gpm) and head loss of the
secondary loops only.
Multiple high-temperature zones
may be controlled by multiple
circulators or zone valves.
• Tee spacing — Spacing
between tees off the boiler
Primary loop and off the
secondary loop should not
exceed 6 inches. This will
eliminate pressure drop between
the tees. As a result, flow will
only occur in the secondary loop
when the secondary circulator is
in operation.
• Sensors — Strap-on sensors
(S1 and S2) are placed on the
boiler piping near the boiler, on
the secondary radiant/snow melt
loops (S3 through S6) between
the secondary loop circulators
and the radiant manifolds, and
outdoors (OAS) on the north side
of the structure, preferably out
of direct sunlight.
• Isolation valves — Isolation
valves are recommended at
the supply and return radiant
manifolds to facilitate purging
and service. Isolation valves or
flanges are recommended at all
circulators for easy service.
• Zoning options —
See pages 127-131.
• Specific wiring schematic —
See pages 192-193.
• Baseboard control — In this
schematic, the baseboard loop(s)
is controlled with a circulator
(ZP1), which will provide flow
through the high-temperature
radiation during a call for heat.
Chapter 13 – Piping Schematics
—
www.uponorpro.com
Non-condensing boiler
Three-way modulating valves
Multi-temperature radiant floor heating
High-temperature radiation
Domestic hot water
Primary/secondary piping
Manifold with Telestats
Manifold without Telestats
Manifold with Valves
S3
S3
Legend
P1
Circulator
S3
S3
Non-condensing boiler
Three-way modulating valves
Multi-temperature radiant floor heating
S3
High-temperature radiation
Domestic hot water
Primary/secondary
S3piping
Manifold with Telestats
Note:
• Spacing between tees not to exceed 6"
S3
1
1
1
1
S3
Ball Valve
Manifold
with Valves
S3
S3
1
S3
S3
S3
S3
S3
Expansion Tank
Manifold
Telestats
and Airwithout
Separator
P1
Circulator
Zone Valve
S3
S3
S3
OAS
S3
1
1
1
Expansion Tank
and Air Separator
S3
Place outdoor sensor
above
S3 the snow line
on north-facing wall
1
1
S3
Pressure Temperature Gauge
Note:
• Spacing between tees not to exceed 6"
S3
S3
S3
Ball Valve
Non-condensing Boiler
Zone Valve
Domestic Hot Water Tank
Pressure Temperature Gauge
S3
Three-way Modulating
Valve (0-10v)
OAS
Place outdoor sensor
above the snow line
on north-facing wall
Baseboard Boiler
Non-condensing
Domestic Hot Water Tank
Three-way Modulating
Valve (0-10v)
Baseboard
Complete Design Assistance Manual
—
Chapter 13 – Piping Schematics
161
162
Chapter 13 – Piping Schematics
—
www.uponorpro.com