Expanded Commercial Specifications
October 27, 2006 - TECH 3.10
1. Floor Heating System
1.1
Provide a complete floor heating system as shown on the plans and as specified.
Length of loops, pipe sizing and spacing to be determined by HeatLink ®
FloorHeat system approach.
1.2
Piping installed in the slab shall be HeatLink® cross-linked polyethylene (PEX)
oxygen barrier tube installed in loops with spacing, length and size as per design
drawings or HeatLink design calculations. PEX pipe to allow oxygen
permeation no more than 0.1g/m3/day at 40°C in accordance to DIN 4726 and to
have a maximum operating temperature of 82C @690 kPa (180°F @100 psi) in
accordance to ASTM F876/877, as approved by CSA B137.5. Floor heat piping
to be placed with HeatLink® Tracking for tight control of spacing and depth.
For slab on grade projects piping can be tied to either a 150 X 150 (6" x 6")
wire mesh or a rebar with an even grid pattern (i.e.. 12" x 12", 18" x 18", or 24"
x 24") using plastic tie straps. Under no circumstances is pipe to be tied using a
binding wire. The installation shall be in strict accordance with the
manufacturer’s instructions.
1.3
System to be controlled with an indoor outdoor temperature reset controller in
conjunction with an outdoor sensor and a secondary supply water temperature
sensor. Controller to operate a fully automatic modulation of a temperature
mixing device. Individual room control is to be provided by the combination of
HeatLink® #46000 series thermostats and #56000 zone drive actuators for floor
heating or together with #30070 series sensors for floor warming. (See
HeatLink® thermostat description in the following).
1.4
Ensure that a minimal bending radius of 6 times the pipe diameter is
maintained: 1/2" piping = 3" radius, 5/8" piping = 4" radius, 3/4" piping = 5"
radius. Ensure that a minimal bending radius of 8 times the diameter is
maintained: 40x3.7mm piping = 320mm radius, 50x4.6mm piping = 400mm
radius.
1.5
Piping to have a fully enclosed protective conduit elbow where pipes penetrate
the concrete flooring to provide protection from abrasion.
1.6
Provide a 300mm (12") protective sleeve where PEX pipe crosses expansion
joints.
1.7
If in-slab repair joints are necessary, only brass insert compression couplings as
approved by the PEX pipe manufacturer are to be used. Wrap all couplings with
PVC tape or compatible material prior to concrete pouring to prevent any
possible corrosion.
1.8
Ensure a minimum of 1/4" thick foam or “sill gasket” expansion stripping is
placed against all inner and outer walls i.e. wherever the concrete topping
comes in contact with a wall plate. In the case of “gypsum” pour, expansion
stripping is not necessary.
1.9
Closely coordinate in-slab piping layout with other trades. Avoid sanitary drain
piping penetrations, electrical conduit penetrations, partition wall anchors,
furniture anchors, etc. through floor assemblies.
1.10 In all areas where other trades will be drilling, coring or anchoring other
equipment, furniture, or structures to the slab, the Contractor shall mark
locations of in-slab piping on the concrete slab surface to avoid penetration of
fasteners used (i.e., Hilti, Ramset, etc.).
1.11 The radiant slab system shall not be used for temporary heating until the
structural slabs are sufficiently cured and until all controls and safety devices
are in place and in working order.
2. Hydrostatic/air Testing
2.1
Pressure test HeatLink® FloorHeat PEX pipes to 80 to 100 psi (hydrostatic) or
60 to 80 psi (air test) for a minimum of 24 hours prior to and during concrete
pouring, or before any piping enclosure. Each PEX pipe loop must be
individually filled in either test.
3. Manifold/header
3.1
Provide HeatLink® flow balancing manifolds made of plastic construction or
stainless steel complete with wall support brackets, end caps, manual air vents,
hose bibs, thermometers; supply module with built in shut off valves, and return
module with flow regulating and balancing valves.
3.2
All loop numbers to be clearly marked on PEX pipe wall before being
connected to manifold. Room identification and loop number to be printed and
placed on each individual module in the manifold tag slot with the identification
tags provided. Pipe loops to be identified to allow for system balancing in the
future.
3.3
Manifolds to be housed in an accessible manifold housing/enclosure. Housing to
be either built on site as part of the framed wall structure or optionally a prefabricated metal access box to be provided. Doors to be hinged to allow for
unobstructed access in either case.
3.4
Manifolds to be wrapped with plastic sheets for protection from dirt, dust and/or
concrete during pouring in the course of construction.
4. HeatLink® Thermostats And Wiring Rough-in
4.1
Zone control to be provided by using HeatLink® #46000 series thermostats with
a preferable set temperature differential of no more than 0.5oF. Thermostats to
work in conjunction with either HeatLink® #56200 series actuator to provide
selected control for individual heating zone.
4.2
The HeatLink® #46000 thermostat to work on a combination of a proportional
input processing, providing a pulse width modulation output. The HeatLink ®
#56200 actuator to be a non-motorized zone drive motor actuated by the means
of an electric current.
4.3
Mounting the thermostat by roughing-in three wires (or four wires for floor
warming) 6" above light switch for future access. The wires to be routed to the
corresponding manifold location.
4.4
Each HeatLink® #46000 thermostat requires a 24V power source. A maximum
of 6 HeatLink® #56000 series zone drive actuators can be operated from a
thermostat.
5. System Start-up
5.1
Thoroughly clean, degrease and flush the new system before antifreeze solution
is added. System cleaning shall be in accordance with the manufacturers’
recommendations
5.2
Add to floor heating system a minimum of 30% glycol/water mixture for freeze
protection and system corrosion inhibitor, i.e. Dowfrost, Ucartherm or
equivalent.
5.3
Test corrosion and/or antifreeze solution for protection level and maintain
records in a manual to keep track of water quality control.
6. Testing, Balancing And Warranties
6.1
Contractor is responsible for ensuring all necessary adjustments to floor heating
equipment and controls, and that the entire system is fully tested, balanced and
operating as per specification.
6.2
All maintenance data and operation instructions on system controller (if
applicable) to be provided and kept on site complete with a copy of piping
layout. Data to be neatly assembled and placed in a protective binder.
6.3
All in-slab PEX pipes to carry 25 year guarantee from the manufacturer,
complete with a 10 year third party consequential coverage including damage and
expenses incurred. Refer to the HeatLink® warranty.