BRAZED PLATE
HEAT EXCHANGERS
COMFORT
SOLUTIONS
INSTALLATION
AND
MAINTENANCE
MANUAL
DIVERSIFIED HEAT TRANSFER, INC. • Website: www.dhtnet.com • 1-800-221-1522
INSTALLATION
INSTALLATIONAND
ANDMAINTENANCE
MAINTENANCEFOR
FORBPHEs
CBE’s
Mounting............................................................................................................................................2
.........................................................................................................................................1
Mounting
Connections
Connections........................................................................................................................................3
.....................................................................................................................................2
General .........................................................................................................................................3
General........................................................................................................................................2
Threaded
connections...................................................................................................................4
Allowable
for Pipe Assembly Conditions......................................................4
Threaded Connection
connections..Loads
................................................................................................................3
Soldering
Connections
.................................................................................................................5
Allowable Connection Loads for Pipe Assembly Conditions.....................................................3
Soldering Procedure .....................................................................................................................5
Soldering
Connections................................................................................................................4
Welding
Connections
.......................................................................................................................6
Strainers............................................................................................................................................6
Soldering Procedure....................................................................................................................4
Insulation ..........................................................................................................................................6
Welding Connections........................................................................................................................5
Installation of CBEs in Different Applications ................................................................................7
Strainers............................................................................................................................................5
Single-Phase Applications, e.g. Water/Water or Water/Oil.........................................................7
Refrigerant
Applications in General ............................................................................................8
Insulation.
..........................................................................................................................................5
Refrigerant Applications and Evaporators; V-Type CBEs, e.g. V27 or V45 ..............................8
Installation of BPHEs in Different Applications..............................................................................6
Refrigerant Applications and Expansion Valves .........................................................................8
Single-Phase
Applications,
Water/Water
or Water/Oil.........................................................6
Refrigerant
Applications
ande.g.
Freezing
Protection
- To prevent freezing ....................................9
Cleaning
of theApplications
CBEs .......................................................................................................................9
Refrigerant
in General............................................................................................7
Warranty.........................................................................................................................................11
Refrigerant
Applications and Evaporators; V-Type BPHEs, e.g. V27 or V45............................7
Disclaimer
......................................................................................................................................11
Refrigerant Applications and Expansion Valves.........................................................................7
Refrigerant Applications and Freezing Protection - To prevent freezing....................................8
Cleaning of the BPHEs.....................................................................................................................8
Warranty............................................................................................................................................9
Disclaimer.........................................................................................................................................9
Installation
Installation and
and Maintenance
Maintenance Manual
Manual For
For CBEs
BPHEs
Mounting
Mounting
Never expose
expose the
the unit
unit to
to pulsations
pulsations or
or excessive
excessive cyclic
cyclic pressure
pressure or
or temperature
temperature changes.
changes. It
It is
is also
also
Never
important that
that no
no vibrations
vibrations are
are transferred
transferred to
to the
the heat
heat exchanger.
exchanger. If
If there
there is
is aa risk
risk of
of this,
this, install
install
important
vibration
absorbers.InInthethe
of larger
connection
diameters,
we you
advise
you
use an
vibration absorbers.
casecase
of larger
connection
diameters,
we advise
to use
an to
expanding
expanding
device
in theUse
pipeline.
e.g.mounting
a rubber mounting
strip asbetween
a bufferthe
between
device in the
pipeline.
e.g. a Use
rubber
strip as a buffer
BPHEthe
andCBE
the
and
the mounting
mounting
clamp. clamp.
In
water
or or
water
to oil,
the the
mounting
direction
has
In single-phase
single-phase applications
applications such
suchasase.g.
e.g.water
watertoto
water
water
to oil,
mounting
direction
little
or
no
effect
on
the
performance
of
the
heat
exchanger,
but
in
two-phase
applications,
the
has little or no effect on the performance of the heat exchanger, but in two-phase applications,
orientation
of the
heatheat
exchanger
becomes
very
important.
In In
two-phase
the orientation
of the
exchanger
becomes
very
important.
two-phaseapplications,
applications,SWEP’s
DHT’s
CBEs
should
be
mounted
vertically,
with
the
arrow
on
the
front
plate
pointing
upwards.
BPHEs should be mounted vertically, with the arrow on the front plate pointing upwards.
Several
mountingsuggestions
suggestionsforfor
SWEP
CBEs
are shown
Mounting
studin bolts,
in
Several mounting
DHT
BPHEs
are shown
below.below.
Mounting
stud bolts,
different
different
versions
and locations,
are available
on theasCBEs
as an option.
versions and
locations,
are available
on the BPHEs
an option.
Supported
Supported from
from the
the
bottom
bottom
Sheet
Sheet metal
metal
bracket
bracket
(rubber
(rubber insert
insert
between
between
bracket
bracket and
and
exchanger)
exchanger)
Crossbar
Crossbar and
and
bolts
(rubber
bolts (rubber
insert
insert
between
between the
the
crossbar
crossbar and
and
exchanger)
exchanger)
Equipped with
with
Equipped
mounting
stud
mounting stud
bolts on
on the
the
bolts
front
or
back
front or back
cover plate
plate
cover
Support legs
legs are
are
Support
available
for
some
available for some CBEs
BPHEs
For
smaller BPHEs
CBEs it
alsopossible
possibleto tomount
mount
by simply
suspending
it the
from
the
For smaller
it isis also
thethe
unitunit
by simply
suspending
it from
pipes/
pipes/connections.
connections.
21
Connections
Connections
General
General
All connections
connections are
are brazed
brazed to
to the
the heat
heat exchanger
exchanger in
in the
the general
general vacuum
vacuum brazing
brazing cycle,
cycle, aa process
process
All
which
gives aa very
verystrong
strongseal
sealbetween
betweenthe
theconnection
connectionand
and
cover
plate.
However,
which gives
thethe
cover
plate.
However,
taketake
carecare
not
not
to join
the counterpart
force
the connection
is damaged.
to join
the counterpart
withwith
suchsuch
force
that that
the connection
is damaged.
Depending
onapplication,
application,there
there
lotoptions
of options
available
the connections,
Depending on
areare
a lota of
available
for thefor
connections,
differentdifferent
versions

versions
and
locations,
e.g.
Compac
flanges,
SAE
flanges,
Rotalock,
Victualic,
threaded
and locations, e.g. Compac® flanges, SAE flanges, Rotalock, Victualic, threaded connections and
connections
and welding
connections.
It isthe
important
to have the
rightstandard
international
or local
welding connections.
It is important
to have
right international
or local
of connection,
standard
of
connection,
as
they
not
always
are
compatible.
as they not always are compatible.
Rotalock Connections
Victualic Connections
Welding Connections
Flanges of DIN Type,
Compac flanges
Flanges of SAE Type
SAE O-Ring
Connections
Sealing surface
connections have
have an
anexternal
externalheel.
heel.The
Thepurpose
purposeofofthe
theheel
heel
Some connections
is is
to
to
simplify
the
pressure
and
leakage
testing
of
the
CBE
in
simplify the pressure and leakage testing of the BPHE in production.
production.
Some connections are equipped with a special plastic cap to protect
Some
connections
are equipped
special plastic
capprevent
to protect
the
threads
and sealing
surface ofwith
the aconnection
and to
dirt
the
threads
and
sealing
surface
of
the
connection
and
to
prevent
dirt
and dust from entering the BPHE. This plastic cap should be removed
and care,
dust in
from
entering
the CBE.
This plastic
cap should
be
with
order
not to damage
the thread
or any other
part of the
removed
with
care,
in
order
not
to
damage
the
thread
or
any
other
connection. Use a screwdriver, pliers or knife.
part of the connection. Use a screwdriver, pliers or knife.
32
Threaded connections
Threaded connections can be female or male of well-known standards such as, ISO-G, NPT and
ISO 7/1. The exterior can also be hexagonal which is shown below.
Externally Threaded
Connections (Male)
Internally Threaded
Connections (Female)
of Standard Type
Internally Threaded
Connections (Female)
with a Hexagonal
Exterior
Allowable Connection Loads for Pipe Assembly Conditions
Mb
The maximum allowable connection loads
given below are valid for low-cycle
fatigue.
The
maximum
allowable
connection loads given below are valid for
low cycle fatigue. If high cycle fatigue is
involved special analysis should be made
Mt
Pipe
Size
Shear Force, Tension Force, Ft
Bending Moment,
Torque, Mt
Fs
Mb
(kp)Force(kN) Tension
(kp)Force (Nm) Bending
(kpm)
(Nm) (kpm
Pipe Size(kN) Shear
Moment
Torque
)
inches
FT (lbs)
MB (ft.lb)
MT (ft.lb)
FS (lbs)
7
0.7
5
0.5
40
4
70
7
½”
24
2.4
5
0.5
40
4
230
23
¾”
23
2.3
8
0.8
90
9
310
32
1”
29
3.0
13
1.3
175
18
530
54
1 ¼”
33
3.4
19
1.9
310
32
700
71
1 ½”
43
4.4
27
2.8
510
52
1200
122
2”
89
9.1
36
3.7
780
80
2900
296
2 ½”
146
14.9
82
8.4
2700
277
8100
827
4”
43
Soldering Connections
Soldering
Soldering Connections
Connections
The soldering connections (sweat connections) are in principle
The soldering
soldering
connections
(sweatconnections)
connections)
in principle
designed
for connections
pipes
with (sweat
dimensions
in mm
or
inches.
The
The
are are
in principle
designed
designed
for dimensions
pipes withto
dimensions
inThemm
The
measurements
correspond
the
internal
diameter
oforthe inches.
connections.
for
pipes with
in mm
or inches.
measurements
correspond
measurements
correspond
to
the
internal
diameter
of
the
connections.
Some
of
SWEP’s
soldering
connections
are
universal,
i.e.
fit
both
the
to the internal diameter of the connections. Some of DHT’s soldering
Someand
of SWEP’s
soldering
connections
aremm
universal,
i.e. pipes.
fit the
both
the are
mm
incharepipes.
Thesei.e.
arefitdenominated
xxU,
as
28U
connections
universal,
both the
and such
inch
These
mm
and
inch
pipes.
These
are
denominated
xxU,
such
as
the
28U
which
fits
both
the
1
1/8”
and
28.75
mm.
denominated xxU, such as the 28U which fits both the 1 1/8” and 28.75 mm.
which fits both the 1 1/8” and 28.75 mm.
All
CBEs
are
vacuum-brazed
witheither
eithera pure
a pure
copper
or a nickel-based
filler. normal
Under
All BPHEs are vacuum-brazed with
copper
fillerfiller
or a nickel-based
filler. Under
All
CBEs
are vacuum-brazed
athepure
copper not
filler
or not
a 1470°F
nickel-based
filler.
Under
normal
soldering
conditions
(nowith
vacuum),
temperature
should
exceed(800°C).
1470°F
(800°C).
soldering
conditions
(no vacuum),
theeither
temperature
should
exceed
Too
much
normal
soldering
conditions
(no
vacuum),
the
temperature
should
not
exceed
1470°F
(800°C).
Too
much
heat
could
change
the
material
structure
resulting
in
internal
or
external
leakage
at
the
heat could change the material structure resulting in internal or external leakage at the connection.
Too much heat
could change
the
material
structure
resulting
in internal
or external
leakage
at the
connection.
Because
of
this
we
recommend
that
all
soldering
is
made
with
silver
solder
Because of this we recommend that all soldering is made with silver solder containing min. 45%
connection.min.
Because silver.
of thisThis
we type
recommend
that
solderinglow
is made with
silver solder
containing
of solder
has all
a relatively
silver. This type 45%
of solder has
a relatively
low soldering
temperaturesoldering
and hightemperature
moistening and
and
containing
min. and
45%fluidity
silver. properties.
This type of solder has a relatively low soldering temperature and
high
moistening
fluidity
properties.
high moistening and fluidity properties.
When soldering flux is used in order to remove oxides from the metal surface. This property
When soldering flux is used in order to remove oxides from the metal surface. This property
When soldering
flux is used
in aggressive.
order to remove
oxides from
the metal
surface.
This
makes
the flux potentially
very
Consequently,
it is very
important
to use
theproperty
correct
makes
the
flux
potentially
very
aggressive.
Consequently,
it
is
very
important
to
use
the
correct
makes the
flux potentially
Consequently,
use the tocorrect
amount
of flux.
Too much,very
mightaggressive.
lead to severe
corrosion, itsoisnovery
fluximportant
should betoallowed
enter
amount of
of flux. Too much, might lead to severe corrosion, so no flux should be allowed to enter
amount
the
CBE. flux. Too much, might lead to severe corrosion, so no flux should be allowed to enter
the CBE.
BPHE.
the
Soldering
Soldering Procedure
Procedure
Soldering Procedure
The
hard silver
silver soldering
soldering procedure
procedure for
for all
all BPHE
CBE connections
The hard
connectionscan
canbe
be carried
carried out
out without
without any
any use
use
Thecooling
hard silver
procedure
forunder
all CBE
connections
can be
carried
out the
without
any use
of
water,soldering
neither by
dimpling
water
nor e.g. water
flow
through
waterside
of
of cooling water, neither by dimpling under water nor e.g. water flow through the waterside of the
of cooling
water, neither by dimpling under water nor e.g. water flow through the waterside of
the
exchanger.
exchanger.
the exchanger.
1. Clean the joints to be soldered. Clean the inside of the connection on the CBE and the
1.
Clean the
the joints
joints to
to be
be soldered.
soldered. Clean the
ofofthe
connection on
the BPHE
and the
the
1. outside
Clean
theinside
inside
the
CBEe.g.
and
of the pipe.
Degrease the Clean
connection
properly
withconnection
some kindon
of the
solvent,
Tri.
outside
of
the
pipe.
Degrease
the
connection
properly
with
some
kind
of
solvent,
e.g.
Tri.
outsideflux
of the
pipe.
Degrease
connection
withofsome
kind of solvent, e.g. Tri.
2. Apply
to the
inside
of the the
connection
andproperly
the outside
the pipe.
2.
Apply flux
flux
to the
the
inside
of the
the connection
connection and
and the
the outside
outside of
of the
the pipe.
pipe.
2. Center
Apply
to
inside
of
3.
the pipe
into
the connection.
3.
Center oxidation
the pipe
pipe into
into
the connection.
connection.
3. Avoid
Center
the
4.
on the
inside of the pipe by sending a flow of nitrogen through the pipe
4.
Avoid
oxidation
on
the
inside
pipe
sending
a flow
of nitrogen
through
the pipe
and
4. and
Avoid
on the soldering
insideofofthe
the
pipebyby
sending
a flow
of nitrogen
through
the pipe
theoxidation
CBE during
process.
theis BPHE
during
soldering
process.
and
the
CBE
during
the
soldering
process.
5. It
important
thatthe
the
connection
and the pipe are evenly heated.
5.
It
is
important
that
the
connection
and
the pipe
pipe
are connection
evenly heated.
heated.
5.
It
is
important
that
the
connection
and
the
are
evenly
6. At the correct soldering temperature
(1112°
F) the
has a slightly red color.
6.
At the
thefirst
correct
soldering
temperature
(1112°
F)keeping
the connection
connection
has
color.
6. The
At
correct
temperature
(1112°
the
has aa slightly
slightly
redthrough
color. the
7.
partsoldering
of the collings
is done
byF)
the nitrogen
flowingred
7.
The first
of
the
collings
is
done
by
keeping
the
nitrogen
flowing
through
the
exchanger.
7. exchanger.
The
firstpart
part
of
the
collings
is
done
by
keeping
the
nitrogen
flowing
through
the
The final cooling could be done with water which removes the last hardened
The
final
cooling
could
be
done
with
water
which
removes
the
last
hardened
flux
on
the
exchanger.
The final
cooling around
could be
with water which removes the last hardened
flux
on the inside
and outside
thedone
solder.
inside
around
the around
solder. the solder.
flux
onand
the outside
inside and
outside
The minimal compound of silver must be at least 45%. Below you find an example of such a
solder.
The minimal
minimalcompound
compound
silver
must
beleast
at least
45%.
Below
you an
find
an example
The
ofof
silver
must
be at
45%.
Below
you find
example
of suchofasuch a solder.
solder.
Tab. 2 Solder and flux
Tab. 2 Solder and flux
Hard silver solder: 454
Flux: 800 F
Welding Connections
Ag
45
Ag
Compound (%)
Cu
CompoundCd
(%)
15
24
Cu
Cd
Zn
16
Zn
5
54
Welding is only recommended on specially designed welding
Melting range
°Frange
ºC
Melting
620-635
1148-1175
ºC
1112-1472
600-800
Hard silver solder: 454
Flux: 800 F
45
15
24
16
620-635
600-800
WeldingConnections
Connections
Welding
Welding is only recommended on specially designed
designed welding
welding
connections.
All
SWEP’s
welding
connections
are
executed
connections. All DHT’s welding connections are executed with
with
a 30° chamfer on top of the connection. Do
Do not
not weld
weld on
on pipes
pipes on
on
other
other types
types of
of connections.
connections. The
The measurement
measurement in
in mm
mm corresponds
corresponds
to
the
external
diameter
of
the
connection.
to the external diameter of the connection.
Welding Procedure
Protect the unit from excessive heating
by:
a) using a wet cloth around the
connection.
b) making a chamfer on the joining tube
and connection edges as shown.
+
Use TIG or MIG/MAG welding. When
using electrical welding circuits, connect
the ground terminal to the joining tube,
not to the back of the plate package.
Internal oxidation can be reduced by a small nitrogen flow.
Strainers
Strainers
If
If any
any of
of the
the media
media contains
contains particles
particles larger
larger than
than 11 mm,
mm, we
we recommend
recommend that
that aa strainer
strainer be
be installed
installed
before the exchanger with a size of 16-20 mesh (number of
of openings
openings per
per inch).
inch). The
The particles
particles
could
could otherwise
otherwise block
block the
the channels,
channels, causing
causing bad
bad performance,
performance, increased
increased pressure
pressure drop
drop and
and risk
risk of
of
freezing.
freezing. Some
Some strainers
strainers can
can be
be ordered
ordered as
as CBE
BPHEaccessories.
accessories.
Insulation
65
Insulation
Insulation
Insulation for
forRefrigerant
RefrigerantApplications
Applications
CBE
BPHE insulation
insulation isis recommended
recommended for
for
evaporators,
evaporators, condensers
condensers or
or district
district heating
heating
applications,
applications, etc.
etc. For
For refrigeration,
refrigeration, use
use
extruded
insulation
sheets,
e.g.
Armaflex
extruded insulation sheets, e.g. Armaflex or
or
equivalent
equivalent which
which also
also can
can be
be supplied
supplied by
by
SWEP.
DHT.
Insulation
Heating
Applications
Insulationforfor
Heating
Applications
For
For heating
heating applications,
applications, various
various types
types of
of
insulation
boxes
can
be
used.
The
working
insulation boxes can be used. The working
temperature
temperature range
range defines
defines which
which insulation
insulation
is
recommended.
SWEP
can
supply some
is recommended. DHT can supply
some of
of
these
insulation
types
as
optional
these insulation types as optional accessories.
accessories.
Installation
inDifferent
DifferentApplications
Applications
Installationof
ofBPHEs
CBEs in
Single-Phase Applications, e.g. Water/Water or Water/Oil
Normally, the circuit with the highest temperature
and/or pressure should be connected on the left side
of the heat exchanger when the arrow is pointing
upwards. For example, in a typical water-to-water
application, the two fluids are connected in a
counter-current flow, i.e. the hot water inlet in
connection F1, outlet F3, cold water inlet F4, outlet
F2. This is because the right-hand side of the heat
exchanger contains one channel more than the lefthand side, and the hot medium is thus surrounded
by the cold medium to prevent heat loss.
6
7
F1
F3
F2
F4
Refrigerant
in General
General
Refrigerant Applications
Applications in
In
all refrigerant
refrigerant applications
In all
applications itit is
is very
very important
important that
that every
every refrigerant
refrigerant channel
channel is
is surrounded
surrounded by
by
aa water/brine
water/brine channel
on
both-hand
sides.
Normally
the
refrigerant
side
must
be
connected
to
the
channel on both-hand sides. Normally the refrigerant side must be connected to the
left-hand
side and
andthe
thewater/brine
water/brinecircuit
circuit
to the
the CBE.
the refrigerant
is
left-hand side
to the
rightright
side side
of theofBPHE.
If theIfrefrigerant
is incorincorrectly
connected,
to
the
first
and
last
channel,
instead
of
water/brine,
the
evaporation
rectly connected, to the first and last channel, instead of water/brine, the evaporation temperature
temperature
willthe
drop,
the risk and
of freezing
very bad performance.
SWEP
used as
will drop, with
riskwith
of freezing
very badand
performance.
DHT BPHEs
used CBEs
as condensers
condensers
or
evaporators
should
always
be
fitted
with
adequate
connections
on
the
refrigerant
or evaporators should always be fitted with adequate connections on the refrigerant side.
side.
Condenser:
Condenser: The
The refrigerant
refrigerant (gas)
(gas) is
is connected
connected to
to the
the upper
upper left
left
connection and the condensate to the lower left connection. The
water/brine
water/brine circuit
circuit inlet
inlet is
is connected
connected to
to the
the lower
lower right
right connection
connection
and
the outlet
outlet to
to the
the upper
upper right
right connection.
connection. DHT
SWEPBPHEs
CBE used
and the
used as
as
condensers
should always
alwaysbebefitted
fitted
with
soldering
connections
on
condensers should
with
soldering
connections
on the
the
refrigerant
refrigerant
side.side.
Evaporator:
Evaporator: The
The refrigerant
refrigerant (liquid)
(liquid) is
is connected
connected to
to the
the lower
lower left
left
connection
and
the
gas
to
the
upper
left
connection.
The
connection and the gas to the upper left connection. The water/water/
brine
brine
is connected
the upper
right connection
the
circuitcircuit
inlet isinlet
connected
to the to
upper
right connection
and theand
outlet
outlet
to the right
lowerconnection.
right connection.
SWEPused
CBEasused
as condensers
to the lower
DHT BPHEs
condensers
should
should
always
be soldering
fitted with
solderingon the
connections
always be
fitted with
connections
refrigeranton
side.the
refrigerant side.
Refrig Gas IN
F1
F2
W ater OUT
Refrig Liq OUT
F3
F4
W ater IN
Fig. 4 Connection location: Condenser
Refrig OUT
F1
F2
W ater IN
Refrig Liq IN
F3
F4
W ater OUT
Fig. 5 Connection location: Evaporator
Refrigerant
Applicationsand
andEvaporators;
Evaporators;
V-Type
BPHEs,
e.g.or
V27
Refrigerant Applications
V-Type
CBEs,
e.g. V27
V45or V45
The
V-type BPHEs
CBEs are
special
The V-type
are equipped
equipped with
with aa special
distribution
at the
the refrigerant
refrigerant inlet,
inlet, i.e.
i.e.
distribution device
device at
normally
The purpose
purpose of
of the
the distribution
distribution
normally port
port F3.
F3. The
device
is
to
evenly
distribute
the
refrigerant
in
device is to evenly distribute the refrigerant in the
the
channel
channel
The
liquid should
should be
be connected
connected to
to the
the
The refrigerant
refrigerant liquid
lower
left
connection
(F3)
and
the
refrigerant
gas
lower left connection (F3) and the refrigerant
outlet
to the
upper
The
gas outlet
to the
upperleft
leftconnection
connection (F1).
(F1). The
water/brine
circuit
inlet
should
be
connected
to
water/brine circuit inlet should be connected to
the
connection (F2)
(F2) and
and the
the outlet
outlet to
to
the upper
upper right
right connection
the
lower
right
connection
(F4).
the lower right connection (F4).
F2
Water
Ref. inlet
Gas
outlet
F4
F3
Water
outlet
Ref.
Liquid
inlet
Refrigerant Applications
Valves
Refrigerant
Applicationsand
andExpansion
Expansion
Valves
The expansion
expansion valve
valve should
should be
be placed
The
placed close
close to
to the
the inlet
inlet connection,
connection, whereas
whereas the
the bulb
bulb should
should be
be
mounted
about
500
mm
from
the
vaporized
refrigerant
outlet
connection.
The
pipe
diameter
mounted about 19.7 inches from the vaporized refrigerant outlet connection. The pipe diameter
between the
the expansion
expansion valve
valve and
and the
the BPHE
CBE should
between
shouldbe
bethe
thesame
sameas
as the
the diameter
diameter of
of the
the refrigerant
refrigerant
liquid
line.
liquid line.
87
For V-type
V-typeBPHEs,
CBEs, the
thepressure
pressuredrop
drop
in the
internal
distribution
system
must
be toadded
to the
For
in the
internal
distribution
system
must be
added
the pressure
pressure
drop
in the expansion
valveattothe
arrive
the totaldrop.
pressure
drop. Normally,
selecting
the
drop
in the
expansion
valve to arrive
totalatpressure
Normally,
selecting the
next larger
nextvalve
largerwill
sizegive
valve
will give satisfactory
performance.
size
satisfactory
performance.
Refrigerant Applications and Freezing Protection - To prevent freezing
a) Use a filter < 1 mm, 16 mesh (see previous chapter on Strainers).
b) Use an antifreeze when the evaporation temperature is close to liquid-side freezing.
c) Use a freeze protection thermostat and flow switch to guarantee a constant water flow before,
during and after compressor operation.
d) Avoid the “pump-down” function.
e) When starting up a system, wait a moment before starting the condenser (or have reduced flow
through it).
Refrigerant
Condensers
Applications
and
F2
The refrigerant (gas) should be connected
to the upper left connection, F1, and the
condensate to the lower left connection,
F3. The water/brine circuit inlet should be
connected to the lower right connection,
F4, and the outlet to the upper right
connection, F2.
Gas
inlet
Water
outlet
F4
F3
Water
Liquid
inlet
outlet
Cleaning of
Cleaning
of the
theCBEs
BPHEs
Thanks to
to the
there
is aisself-cleaning
effect
in
Thanks
the normally
normally very
very high
high degree
degree of
of turbulence
turbulenceininCBEs
BPHEs
there
a self-cleaning
effect
thethe
channels.
However,
in
channels.
However,ininsome
someapplications
applicationsthe
thefouling
foulingtendency
tendencycan
canbe
bevery
veryhigh,
high, e.g.
e.g. when
when
using
extremely
hard
water
at
high
temperatures.
In
such
cases
it
is
always
possible
to
clean
using extremely hard water at high temperatures. In such cases it is always possible to clean the
the
exchanger
by
circulating
a
cleaning
liquid
(CIP
Cleaning
In
Place).
Use
a
tank
with
weak
acid,
exchanger by circulating a cleaning liquid (CIP - Cleaning In Place). Use a tank with weak acid, 5%
5% phosphoric
the exchanger
is frequently
cleaned,
5% oxalic
acid. Pump
the cleaning
phosphoric
acid acid
or, ifor,
theifexchanger
is frequently
cleaned,
5% oxalic
acid. Pump
the cleaning
liquid
liquid
through
the
exchanger.
through the exchanger.
98
For
installations we
we recommend
recommend
For tough
tough installations
factory-installed CIP
CIP connections/valves
factory-installed
connections/valves for
for
easy maintenance.
For optimum
optimum cleaning,
For
cleaning, the
the cleaning
cleaning solution
solution
flow
rate
should
be
a
minimum
of
1.5
flow rate should be a minimum of 1.5 times
times
the normal
normal flow
rate, preferably
preferably in
the
flow rate,
in aa backbackflush mode.
mode. After
After use,
use, do
do not
flush
not forget
forget to
to rinse
rinse
the
heat
exchanger
carefully
with
the heat exchanger carefully with clean
clean
water. A solution
A solution
of sodium
1-2% hydroxide
sodium
water.
of 1-2%
hydroxide
(NaOH)
or
sodium
bicarbonate
(NaOH) or sodium bicarbonate (NaHCO3)
before
theensures
last rinse
that
(NaHCO
before
the3) last
rinse
thatensures
all acid
is
all
acid
is
neutralized.
Clean
at
regular
neutralized. Clean at regular intervals
intervals
F2
CIP solution out
F4
F1
F3
CIP solution in
For further information about cleaning of the
For further information about cleaning of
BPHEs, please consult DHT.
the CBEs, please consult SWEP’s CIP
information or your local SWEP company.
Warranty
DHT offers a 12-month warranty from the date of installation, but in no case longer than 15 months from
the date of delivery. The warranty covers only manufacturing and material defects.
Disclaimer
DHT’s BPHE performance is based on installation, maintenance and operating conditions done in
conformance with this manual. DHT cannot assume any liability for BPHEs that do not meet these criteria.
For further information, please consult DHT’s technical information, local DHT distributor or the factory
directly.
10
9
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Manufacturers and Designers Since 1938
1710 Flushing Avenue • Ridgewood, NY 11385
Phone:1-800-221-1522 • Fax: 718-386-7809
Website: www.dhtnet.com