Installation
Ow ner
Diagnostics
Water-to-Water
Water-Source Heat Pum p
Models WPWD, GSWD and EXWA
Mo d e ls
“ A” a n d la t e r De s ig n S e q u e n c e
WP WD
024-072 – 60 HZ
GS WD
024-072 – 60 HZ
EXWA
240 – 60 HZ
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Co n t e n t s
In s t a lla t io n /S t a rt u p /Co m m is s io n in g
Pre-installation Checklist
General Inform ation
4
4
5
6
Dim ensions/Weights
10
19
Installation Instructions
Electrical Requirem ents
20
21
Pre-Startup Checklist
S t a rt u p /Co m m is s io n in g
Sequence of Operation
21
22
Operating Pressures
24
Startup Checklist & Log
25
26
28
29
Ma in t e n a n c e
Wa rra n t y In fo rm a t io n
Tro u b le s h o o t in g Ch e c k lis t
Un it Wirin g
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P re -in s t a lla t io n
Ch e c k lis t
WARNING
Fib e rg la s s Wo o l!
P ro d u c t c o n t a in s fib e rg la s s w o o l. Dis t u rb in g t h e in s u la t io n in t h is
p ro d u c t d u rin g in s t a lla t io n , m a in t e n a n c e o r re p a ir w ill e xp o s e yo u t o
a irb o rn e p a rt ic le s o f g la s s w o o l fib e rs a n d c e ra m ic fib e rs k n o w n t o t h e
s t a t e o f Ca lifo rn ia t o c a u s e c a n c e r t h ro u g h in h a la t io n . Gla s s w o o l fib e rs
m a y a ls o c a u s e re s p ira t o ry, s k in o r e ye irrit a t io n .
J o b s it e In s p e c t io n
Always perform the following checks before accepting a unit:
1. Verify that the nam eplate data m atches the data on the sales order and bill of
lading (including electrical data).
2. Verify that the power supply com plies with the unit nam eplate specifica-
tions.
3. Visually inspect the exterior of the unit, for signs of shipping dam age. Do not
sign the bill of lading accepting the unit(s) until inspection has been com -
pleted. Check for dam age prom ptly after the unit(s) are unloaded. Once the
bill of lading is signed at the jobsite, the unit(s) are now the property of the
SOLD TO party and future freight claim s MAY NOT be accepted by the
freight com pany.
4. Verify that the refrigerant charge has been retained during shipm ent by use
of gauges. Schrader taps are located external to the cabinet on the 2-ton
through 6-ton equipm ent.
5. After assuring that charge has been retained, reinstall the schrader caps to
assure that refrigerant leakage does not occur.
WARNING
Mic ro b ia l Gro w t h !
We t in t e rio r u n it in s u la t io n c a n b e c o m e a n a m p lific a t io n s it e fo r
m ic ro b ia l g ro w t h (m o ld ), w h ic h m a y c a u s e o d o rs a n d d a m a g e t o t h e
e q u ip m e n t a n d b u ild in g m a t e ria ls . If t h e re is e vid e n c e o f m ic ro b ia l
g ro w t h (m o ld ) o n t h e in t e rio r in s u la t io n , t h e in s u la t io n s h o u ld b e
re m o ve d a n d re p la c e d p rio r t o o p e ra t in g t h e s ys t e m .
J o b s it e S t o ra g e
This unit is intended for indoor use only. To protect the unit from dam age due to
the elem ents, and to prevent possible IAQ contam inant sources from growing,
the unit should be stored indoors. If indoor storage is not possible, the following
provisions for outdoor storage m ust be m et:
1. Place the unit(s) on a dry surface or raise above the ground to assure ade-
quate air circulation beneath the unit.
2. Cover the unit(s) with a water proof tarp to protect them from the elem ents.
3. Make provisions for continuous venting of the covered units to prevent
m oisture from standing on the unit(s) surfaces. Wet interior unit insulation
can becom e an am plification site for m icrobial growth (m old) which has
been determ ined to be a cause of odors and serious health related indoor air
quality problem s.
4. Store units in the norm al UP orientation to m aintain oil in the com pressor.
5. Do not stack m ore than three units in total height for the WPWD/GSWD 2-ton
through 6-ton configurations, and no m ore than two units high for the EXWA
20-ton configuration.
4
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Ge n e ra l
In fo rm a t io n
Un it Na m e p la t e
ton through 6-ton equipm ent, and at
the power block for the 20-ton equip-
m ent.
(which m ay be available for field use).
See page 17 for diagnostic inform a-
tion.
The unit nam eplate is located at the
front of the unit. It includes the unit
m odel num ber, serial num ber, electri-
cal characteristics, refrigerant charge,
and other pertinent unit data.
De s u p e rh e a t e r
All low voltage wiring is m ade at the
unit’s low voltage term inal board.
(Option for 2-ton through 6-ton units)
For units containing the desuperheat-
er option, the unit is shipped from the
factory with a desuperheater water
coil and pum p m ounted internal to the
unit cabinetry. For dom estic hot water
hook-up instructions, see m anual
WSHPC-IN-4 or 72-9006-02.
Wirin g Co n n e c t io n s
Co m p re s s o r Na m e p la t e
The nam eplate for the com pressors
are located on the com pressor shell.
Troubleshooting and connection dia-
gram s for the equipm ent m ay be locat-
ed in the back of this m anual.
Un it De s c rip t io n
Ba s ic 2 4 V Co n t ro ls
(for 2-ton through 6-ton units)
Before shipm ent, each unit is leak test-
ed, dehydrated, charged with refriger-
ant and run tested for proper control
operation.
Safety devices for equipm ent contain-
ing the basic 24V control option in-
clude a low pressure switch and a
freezestat to prevent com pressor op-
eration during low tem perature activi-
ty. The switch is set to activate at
refrigerant pressures of 35 psig or 7
psig to fit m ost applications.
The desuperheater pum p fuse is locat-
ed in the control box within a contain-
er. The fuse is not factory installed to
avoid possible pum p dam age at initial
start-up. If the fuse in installed and the
unit is started without water in the sys-
tem , the pum p will be dam aged. See
page 17 for fuse installation.
Wa t e r-t o -Re frig e ra n t Co ils
The brazed-plate water-to-refrigerant
heat exchangers for the 2-ton through
6-ton equipm ent are constructed of
stainless steel.
The water-to-refrigerant heat ex-
changers for the 20-ton equipm ent are
an inner copper tube or cupro-nickel
(option available on the source-side
only) and steel tube (tube-within-a-
tube) design.
A high pressure switch prevents com -
pressor operation during high or ex-
cessive discharge pressures
exceeding 395 psig.
S c h ra d e r Co n n e c t io n s
Connections for the low and high side
of the refrigeration system are located
conveniently on the unit’s right side
for the 2-ton through 6-ton units, and
behind the front, refrigeration access
panel for the 20-ton unit.
The lockout relay com m unicates the
low or high pressure situation to the
com pressor to prevent operation. The
relay m ay be reset at the therm ostat,
or by cycling power to the unit.
Both heat exchanger types are leak
tested to assure there is no cross leak-
age between the water and refrigerant
gas.
General alarm m ay be accom plished
through the lockout relay to drive light
em itting diodes (LEDs) on a field sup-
plied status indicating therm ostat. Ter-
m inal 6 on the lockout relay is open for
field use in m alfunction indications.
This feature will drive dry contacts
only, and cannot be used to drive field
installed control inputs.
Wa t e r Co n n e c t io n s
One inch brass swivel connections are
provided for the 2-ton through 6-ton
equipm ent. Each brass fitting has a
one inch gasket for the connector. The
gaskets are shipped in the electrical
com partm ent to prevent loss at the job
site.
Water connections for the 20-ton are
located inside the unit at the units
front (source-side) and back (load-
side). The fitting consist of a 2-inch fe-
m ale pipe threaded connection.
De lu xe 2 4 V Co n t ro ls
(for 20-ton unit)
Units containing the Deluxe 24V con-
trol design will incorporate a m icro-
processor-based control board. The
Trane m icroprocessor board is factory
wired to a term inal strip to provide all
necessary term inals for field connec-
tion. The deluxe board is equipped
with a random start relay, anti-short
cycle tim er, brown out protection,
com pressor disable, unit safety con-
trol, diagnostics and a generic relay
Co n t ro ls
The control system offered to control
the unit is a Basic 24 volt control for
the 2-ton through 6-ton unit sizes, and
a deluxe 24 volt m icro processing
board for the 20-ton unit.
All power wiring to the equipm ent is
m ade at the unit contactor for the 2-
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Dim e n s io n s /We ig h t s /
Cle a ra n c e
Table 1: Unit weights
S h ip p in g
We ig h t
S h ip p in g
We ig h t
WARNING
S ize
Im p ro p e r Un it Lift !
c e n t e r o f g ra vit y lift p o in t . To a vo id d ro p p in g o f u n it ,
re p o s it io n lift in g p o in t if u n it is n o t le ve l. Fa ilu re t o
p ro p e rly lift u n it c o u ld re s u lt in d e a t h o r s e rio u s in ju ry
o r p o s s ib le e q u ip m e n t o r p ro p e rt y-o n ly d a m a g e .
w it h p a lle t (lb ) w /o p a lle t (lb )
Te s t lift u n it a p p ro xim a t e ly 2 4 in c h e s t o ve rify p ro p e r
024
036
042
048
060
072
240
163
183
203
214
244
277
1222
153
173
193
204
234
267
1156
Un it Lo c a t io n a n d Cle a ra n c e s
Locate the unit in an indoor area. The
am bient tem perature surrounding the
unit m ust not be less than 45°F. Do
not locate the unit in areas subject to
freezing.
Attention should be given to service
clearance and technician safety. The
unit access panels m ay be easily re-
m oved. There m ust be enough space
for service personnel to perform m ain-
tenance or repair. Provide sufficient
room to m ake water, and electrical
connection(s). Local and national
codes should be followed in providing
electrical power connections. See Fig-
ure 1 for m echanical clearances.
Figure 1: Mechanical clearances
6
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Dim e n s io n s
WP WD/GS WD 0 2 4 -0 3 6
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Dim e n s io n s
WP WD/GS WD 0 4 2 -0 7 2
8
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Dim e n s io n s
EXWA 2 4 0
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In s t a lla t io n
Ge n e ra l In s t a lla t io n Ch e c k s
WARNING
Ha za rd o u s
Vo lt a g e !
The checklist below is a sum m ary of
the steps required to successfully in-
stall a unit. This checklist is intended to
acquaint the installing personnel with
procedures required in the installation
process. It does not replace the de-
tailed instructions called out in the ap-
plicable sections of this m anual.
Dis c o n n e c t a ll e le c t ric p o w e r,
in c lu d in g re m o t e d is c o n n e c t s
b e fo re s e rvic in g . Fo llo w p ro p e r
lo c k o u t /t a g o u t p ro c e d u re s t o
e n s u re t h e p o w e r c a n n o t b e
in a d ve rt e n t ly e n e rg ize d . Fa ilu re t o
d is c o n n e c t p o w e r b e fo re
1
Rem ove packaging and inspect the
unit. Check the unit for shipping
dam age and m aterial shortage; file
a freight claim and notify appropri-
ate sales representation.
s e rvic in g c o u ld re s u lt in d e a t h o r
s e rio u s in ju ry.
Ma in Ele c t ric a l
5
6
7
Verify the power supply com plies
with the unit nam eplate specifica-
tions.
Note: The units have been tied to
the skid by (4) angle brackets. Re-
m ove these brackets from the unit
to slide unit from skid.
Inspect all control panel com po-
nents; tighten any loose connec-
tions.
2
3
4
Verify the correct m odel, options
and voltage from the unit nam e-
plate.
Connect properly sized and pro-
tected power supply wiring to a
field-supplied/installed disconnect
switch and to the m ain power ter-
m inal block (1TB1) in the unit con-
trol box for the 20-ton equipm ent,
or (1K1) for the 2-ton through 6-
ton equipm ent.
Verify the installation location of
the unit will provide the required
clearance for proper operation.
Rem ove refrigeration access panel
and inspect the unit. Be certain the
refrigerant tubing has clearance
from adjacent parts.
8
Install proper grounding wires to
an earth ground.
Note: All field-installed wiring m ust
com ply with NEC and applicable local
codes.
Lo w Vo lt a g e Wirin g (AC & DC)
Re q u ire m e n t s
9
Connect properly sized control wir-
ing to the proper term ination
points between the field supplied
therm ostat and the term inal strip
located in the equipm ent control
box.
10
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In s t a lla t io n
Wa t e r Co n n e c t io n
WARNING
Connect the source-side and load-side
water-in/water-out from the water-to-
water heat pum p to the source system
and the load system .
Im p ro p e r Un it Lift !
Te s t lift u n it a p p ro xim a t e ly 2 4
in c h e s t o ve rify p ro p e r c e n t e r o f
g ra vit y lift p o in t . To a vo id
d ro p p in g o f u n it , re p o s it io n lift in g
p o in t if u n it is n o t le ve l. Fa ilu re t o
p ro p e rly lift u n it c o u ld re s u lt in
d e a t h o r s e rio u s in ju ry o r p o s s ib le
e q u ip m e n t o r p ro p e rt y-o n ly
d a m a g e .
Note: The source for a water-to-water
heat pum p is typically a boiler/cooling
tower or geotherm al loop.
The load for a water-to-water heat
pum p is typically fresh-air unit(s), fan
coil(s), hydronic coil(s), radiant heat,
wall fin, or potable water.
Un it P la c e m e n t
Units m ay be placed into a field sup-
The source and load connections for
the 2-ton through 6-ton equipm ent is
on the right hand side of the unit.
plied m echanical rack (See Figure 2),
or placed on a finished floor. Loosen
com pressor bolts to release tension of
the rubber grom m ets to help reduce
vibration during operation. Sound
proofing m aterial (field supplied) is
recom m ended to help attenuate noise
generated by com pressor vibration.
The 20-ton equipm ent incorporates
the source-side connection at the
unit’s front, and the load-side connec-
tion at the unit’s back.
For vibration isolation, it is recom -
m ended that flexible steel braided
hoses be installed instead of hard pip-
ing the equipm ent to the m ain loop
system or m echanical device.
It is im portant to leave appropriate
clearances around the unit to achieve
m aintenance and
Figure 2: Racking installation
serviceability to
the equipm ent.
See page 6 for
service clearance
Trane offers 4-types of hose kit varia-
tions:
dim ensions.
•
•
•
•
Stainless steel braided flexible
hose with m anual shut-off (ball)
valves
Stainless steel braided flexible
hose with m anual deluxe shut-off
(ball) valves
Stainless steel braided flexible
hose with m anual circuit-setter
valve
Stainless steel braided flexible
hose with autom atic balancing
valve
Additional accessories, such as a
strainer are recom m ended for use to
elim inate contam inants from entering
the brazed-plate or co-axial water-to-
refrigerant heat exchangers.
Figure 3: Water connection
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In s t a lla t io n
Cle a n in g a n d Flu s h in g
t h e Wa t e r Lo o p
bled off.
Note: Vents should be open when the
pum ps and supplem entary heat sys-
tem are shut down.
(3 ) With the air vented and the water
circulating, the entire system
should be checked for leaks with re-
pairs m ade as required.
(4 ) Operate the supplem entary
heat system m aking checks per
m anufacturer’s instructions. Dur-
ing this operation, visual checks
should be m ade for leaks that m ay
have occurred due to increased
heat. Repair as required.
After the piping system is com plete,
the flexible hose connectors should be
doubled back to com plete the water
circuit external to the unit (avoiding
trash settle-out in the condenser). Fig-
ure 4. An extra pipe m ay be necessary
to connect the hose kits. See Page 14
for antifreeze/water m ixture by vol-
um e.
Figure 4: Flushing water loop
(1 ) Water circulation system should be
filled with clean water using the water
m ake up connections. Note: Air vents
should be opened during filling.
(5 ) Open the system at the lowest
point for the initial blow down
(m aking sure the m ake up water is
equal to the water being dum ped).
Continue blow down until the water
leaving the drain runs clear, but not
less than 2 hours.
(2 ) With the air vents closed, start the
circulating pum p and then crack the air
vents to bleed off the trapped air, as-
suring circulation through all com po-
nents of the system .
(6 ) Shut down pum ps and supplem en-
tary heat system . Reconnect the hoses
placing the water-to-refrigerant heat
exchanger in the water circulating sys-
tem .
Note: Make up water m ust be available
to the system to replace the volum e
form erly occupied by the air that is
Co n n e c t in g a Lo o p P u m p Kit
Clo s e d Lo o p S ys t e m
FROM UNIT’S
W.O.
TO UNIT’S
W.I.
All piping external to the unit is the re-
sponsibility of the installer. The water
pipe installation m ust be done in ac-
cordance with local codes. If no local
code applies, national codes should be
followed. It is the contractor’s respon-
sibility to know and adhere to all appli-
cable codes.
BRONZE OR CAST IRON PUMP
PURGING CAP (2)
SHUT-OFF 3-WAY
VALVE (2)
Water inlet and outlet to the unit’s wa-
ter-to-refrigerant heat exchanger are
clearly m arked on the subm ittal draw-
ings found on pages 7 through 9. The
supply and return piping m ust be in-
stalled correctly to the unit to ensure
the safety devices will work properly.
Units that are not piped accordingly
will not obtain the m anufacturers war-
ranty.
Figure 5 Pum p m odule
1" MPT x BARB FITTINGS,
1" MPT x BARB ELBOWS with
PRESSURE TEMPERATURE PORTS,
AND 10’ OF RUBBER HOSE with
4 HOSE CLAMPS.
A pum p m odule (Figure 5) and hose kit
(Figure 6) are typically used to connect
the unit to closed loop piping in do-
m estic applications.
Figure 6: Hose kit
12
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In s t a lla t io n
S u p p ly/Re t u rn P ip e Co n n e c t io n s
t o t h e Lo o p P u m p Kit
(3 ) The water lines should be routed
not to interfere with access to the unit.
The use of a short length of high pres-
sure hose with the swivel fitting m ay
sim plify the connections and prevent
vibration. Pressure/Tem perature (P/T)
ports are required for troubleshooting
the hydronic side of the unit. Extrem e
care should be taken by the installing
contractor to prevent dirt or other for-
eign m atter from entering the pipes or
piping com ponents during construc-
tion. Pipes should be capped until they
are in place and ready to be connected
to the system .
(1 ) Connect the supply and return hos-
es to the water-inlet (from supply) and
water-outlet (to return) of the unit. The
rubber gaskets for the water-in and
water-out connections are located in
the control box. These gaskets require
field installation prior to connecting
the water piping to the unit.
(2 ) Hand tighten the 1" FPT brass swiv-
el quick connections to the 1" MPT
adapter with P/T ports. Using a
wrench, tighten the adapter approxi-
m ately 1/2 additional turn. Care m ust
be taken to avoid overtightening as to
not dislodge the snap ring.
(4 ) Install the Trane loop pum p m od-
ule. See installation m anual WSHPC-
IN-5 or 72-9006-03 for instructions. If
the unit does not contain a Trane loop
pum p m odule, two ball valves m ust be
installed between the unit and the
loop’s water pum p to isolate the unit
from the system ’s water loop during
m aintenance and em ergency situa-
tions. See Figure 7.
If the unit s contain a Trane loop pum p
m odule, shut-off valves are supplied
by the m anufacturer within the pum p
m odule assem bly.
(5 ) Connect the unit’s water-in and wa-
ter-out hose to the loop pum p m odule.
(6 ) The pum ps connect to the load side
230 volt com pressor contactor, and re-
quire a field installed 6 am p in-line
fuse and holder.
(7 ) Insulate all indoor piping. Equip-
m ent is designed to operate with fluid
tem perature of 25ºF to 120ºF
Figure 7: Loop pum p kit installation
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In s t a lla t io n
Wa t e r He a t e r Ho o k -u p (option)
Instructions for connection from the
desuperheater (option) water-in/out to
the dom estic hot water heater m ay be
found in WSHPC-IN-4 or 72-9006-02.
This water heater kit (Figure 8) ships in
all units with the desuperheater op-
tion. The kit is zip tied to the com pres-
sor base; and consists of piping
Figure 8: Water heater kit
connections and shut-off valve.
For units containing the desuperheat-
er option, the desuperheater pum p
fuse is located within a container in-
side of the control box. The fuse is not
factory installed.
Note: If the fuse is installed, and the
unit is started without water in the sys-
tem , pum p dam age m ay occur.
Us in g An t ifre e ze
In areas of the country where entering
water tem peratures drop below 45°F
or where piping is being run through
areas subject to freezing, the loop
m ust be freeze protected by using an
approved antifreeze solution to pre-
vent the earth loop water from freez-
ing inside the heat exchanger.
Methanol and glycols are the m ost
com m only used antifreeze solutions.
Consult your geotherm al unit supplier
for locally approved solutions in your
area.
Propylene glycol is not recom m ended
in installations where the water tem -
perature are expected to fall below
30°F. At extrem e tem peratures, the
viscosity increases to the point where
norm al loop circulating pum ps m ay
not m aintain proper flow.
Table 2: Antifreeze requirem ents based on volum e
Minimum Temperature for Freeze Protection
Type of Antifreeze
10°F
25%
-
15°F
21%
-
20°F
16%
-
25°F
10%
-
30°F
3%
Methanol
Propylene Glycol
6%
If propylene glycol is the only locally
approved solution for anti-freeze,
good engineering practices should be
used to achieve the desired flow.
Calculate the approxim ate volum e of
water in the system by using the re-
quirem ents detailed in Table 2. Add
three gallons to this total to allow for
the water contained in the hose kit and
geotherm al unit.
14
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In s t a lla t io n
Fillin g t h e Lo o p P u m p Kit S ys t e m
Once the loop, pum p m odule and unit
are fully connected, the system will
need to be filled with water or water/
antifreeze solution. See Page 14 for an-
tifreeze/water m ixture by volum e.
Fill both sides of the outside portion of
the loop first via the pum p m odule.
The hose kit and unit should be filled
last after purging of the ground loop is
com plete.
To fill t h e o u t s id e lo o p ; (1 ) attach a
water hose to the 1-inch FPT brass
valve ports located on the front of the
pum p m odule (the caps at the front of
the m odule should be rem oved). (2 )
Rotate both valve 1 and valve 2 to the
"Position B" to prevent water from go-
ing to the unit. (3 ) Turn on the water
and allow the earth loop to slowly fill
with water. (4 ) Run the water until a
steady flow of water without air bub-
bles is observed com ing out of the dis-
charge hose.
Filling the Hose Kit and Unit and/or
Hose Kit and Unit Flush
Filling the Outside Loop and/or
Outside Loop Flush
To fill t h e h o s e k it a n d u n it ; (1 ) Re-
position valve 1 to the "Position A" to
fill the unit and hose kit. (2 ) Turn the
water on and allow the hose kit and
unit to be filled slowly with water. (3 )
Run the water until a steady flow of
water without air bubbles is observed
com ing out of the discharge hose.
S ys t e m P re s s u riza t io n
(1 ) Rotate both valves 1 and 2 to the
"Position D" to pressurize the system .
(2 ) Exam ine all internal unit fittings or
connections for leaks. (3 ) After check-
ing for leaks, the system is ready to be
flushed.
Run System
Full System Flush
Note: The plastic 1-inch MPT valve
plugs m ust be replaced after filling
and/or flushing is com pleted.
norm ally suitable for jobs up to six
tons. The loop m ust be flushed with a
high volum e of water at a m inim um
velocity of (2 feet per second) in both
directions. See Table 3 for flow rates
required to flush earth loops.
Note: There m ay be a certain am ount
of entrained air left in the loop system .
See "Position C" for valve rotation to
place the valves in RUN position.
Cle a n in g a n d Flu s h in g
t h e Wa t e r Lo o p
Table 3: System flushing flow rates
Gallons per
100 Ft.
Minimum
Flush GPM
All installations m ust be thoroughly
flushed to rem ove air and dirt from the
earth loop before running the system .
The pum ps used in the pum p m odule
are not adequate to use for the flush-
ing out of the unit. A secondary pum p
capable of delivering 50 gpm at 60 feet
of head (a 1 1/2 hp or larger pum p) is
Pipe
3/4" PE
1" PE
3.02
4.73
7.55
9.93
15.36
3.8
6.0
1 1/4" PE
1 1/2" PE
2" PE
9.5
13.0
21.0
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In s t a lla t io n
P o w e r Wirin g
Fie ld In s t a lle d P o w e r Wirin g
Power wiring to the equipm ent m ust
conform to National and Local Electric
Codes (NEC) by a professional electri-
cian.
The high voltage connection is m ade
at the 1TB1 term inal block for the 20-
ton equipm ent, and at 1K1 for the 2-
ton through 6-ton equipm ent. The ter-
m inal block or contactor is located in-
side the unit control box. Refer to the
custom er connection diagram that is
shipped with the unit for specific ter-
m ination points.
WARNING
Live Ele c t ric a l
Provide proper grounding for the unit
in accordance with the local and na-
tional codes.
Co m p o n e n t s !
Du rin g in s t a lla t io n , t e s t in g , s e r-
vic in g a n d t ro u b le s h o o t in g o f t h is
p ro d u c t , it m a y b e n e c e s s a ry t o
w o rk w it h live e le c t ric a l c o m p o -
n e n t s . Ha ve a q u a lifie d lic e n s e d
e le c t ric ia n o r o t h e r in d ivid u a l
w h o h a s b e e n p ro p e rly t ra in e d in
h a n d lin g live e le c t ric a l c o m p o -
n e n t s p e rfo rm t h e s e t a s k s . Fa ilu re
t o fo llo w a ll e le c t ric a l s a fe t y p re -
c a u t io n s w h e n e xp o s e d t o live
e le c t ric a l c o m p o n e n t s c o u ld re -
s u lt in d e a t h o r s e rio u s in ju ry.
Co n t ro l P o w e r Tra n s fo rm e r
The 24-volt control power transform -
ers are to be used only with the acces-
sories called out in this m anual.
Transform ers rated greater than 50 VA
are equipped with internal circuit
breakers. If a circuit breaker trips, turn
OFF all power to the unit before at-
tem pting to reset it.
WARNING
Verify that the power supply available
is com patible with the unit’s nam e-
plate. Use only copper conductors to
connect the power supply to the unit.
Ha za rd o u s Vo lt a g e !
Dis c o n n e c t a ll e le c t ric p o w e r, in -
c lu d in g re m o t e d is c o n n e c t s b e -
fo re s e rvic in g . Fo llo w p ro p e r
lo c k o u t /t a g o u t p ro c e d u re s t o e n -
s u re t h e p o w e r c a n n o t b e in a d -
ve rt e n t ly e n e rg ize d . Fa ilu re t o
d is c o n n e c t p o w e r b e fo re s e rvic -
in g c o u ld re s u lt in d e a t h o r s e ri-
o u s in ju ry.
CAUTION
Us e Co p p e r
Co n d u c t o rs On ly!
Un it t e rm in a ls a re n o t d e s ig n e d
t o a c c e p t o t h e r t yp e s o f c o n d u c -
t o rs . Fa ilu re t o u s e c o p p e r c o n -
d u c t o rs m a y re s u lt in e q u ip m e n t
d a m a g e .
The transform er is located in the
control box.
Ma in Un it P o w e r Wirin g
A field supplied disconnect switch
m ust be installed at or near the unit in
accordance with the National Electric
Code (NEC latest edition).
Location of the applicable electric ser-
vice entrance for HIGH (line voltage)
m ay be found on the unit subm ittal at
the front of this m anual (pages 7
through 9).
16
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In s t a lla t io n
Lo w Vo lt a g e Wirin g
Co n t ro ls Us in g 2 4 VAC
Before installing any wire, refer to the
electrical access locations on the unit
subm ittals located on pages 7 through
9.
Ensure that the AC control wiring be-
tween the controls and the unit’s ter-
m ination point does not exceed three
(3) ohm s/conductor for the length of
the run.
Note: Resistance in excess of 3-ohm s
per conductor m ay cause com ponent
failure due to insufficient AC voltage
supply.
Figure 9: Low voltage connection
Check all loads and conductors for
grounds, shorts, and m is-wiring.
Use copper conductors unless other-
wise specified.
Do not run the AC low voltage wiring
in the sam e conduit with the high volt-
age power wiring.
Table 4: 24V AC conductors
Distance
from unit to Control
Recom m ended
Wire Size
000-460 feet
461-732 feet
733-1000 feet
18 gauge
16 gauge
14 gauge
Low voltage connection diagram s are
shown in Figure 9. Optional desuper-
heater fuse installation shown in Fig-
ure 10.
Figure 10: Desuperheater fuse installation
Table 5: Deluxe controller diagnostic LEDs
Color: Green
LED1
OFF
ON
Color: Red
Controller Mode
LED2
LED3
OFF
OFF
OFF
Control OFF
OFF
Norm al/Com pressor OFF
Anti-short Cycle
ON
OFF
FLASH
ON
ON
OFF
Norm al/Com pressor ON
Brownout Condition
FLASH
ON
ON
OFF
FLASH
FLASH
ON
ON
Soft Lockout (low pressure)
Soft Lockout (high pressure)
Manual Lockout (low pressure)
Manual Lockout (high pressure)
Manual Lockout (condensate overflow)
Com pressor Disable
ON
FLASH
ON
ON
ON
ON
FLASH
OFF
ON
FLASH
ON
ON
OFF
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In s t a lla t io n
Ch a n g in g Fre e ze s t a t o r Lo w P re s -
s u re Cu t o u t S w it c h e s
(2 ) A unit with a 20°F freezestat is go-
ing to be put on an open well system
or a closed loop system with NO anti-
freeze solution. By definition, the unit
m ust have a 35°F freezestat installed
prior to operation.
the old low pressure cutout to the new
low pressure cutout.
(WP WD/GS WD m o d e ls ONLY)
Each unit has two factory installed low
pressure cutout switches and one
freezestat. Only one of the low pres-
sure cutout switches is connected to
the 24 volt control circuit, dependent
on which freezestat is being used (i.e.
35°F or 20°F). Both the freezestat and
the low pressure cutout are in the lock-
out relay circuit. The freezestat m oni-
tors the tem perature of the water
leaving the source and load side wa-
ter-to-refrigerant heat exchangers,
protecting the heat exchanger from
fluid freeze up. The low pressure cut-
out m onitors the suction pressure of
the com pressor to protect the com -
pressor from liquid floodback or oper-
ating under loss of charge conditions.
Identifying the Low Pressure Cutouts
The 7 psig low pressure cutout is used
with a 20°F freezestat. It is installed in
the insulated line and is in the piping
tee going to the external schrader port.
The 35 psig low pressure cutout is
used with a 35°F freezestat. It is in-
stalled in the insulated line and is not
connected to any fittings.
The best tim e to install the freezestat/
low pressure cutout is prior to install-
ing the unit. The freezestat is easily ac-
cessible from the top service door.
The 395 psig high press cutout is in-
stalled in the un-insulated com pressor
discharge line. It is the only cutout lo-
cated in this line. Further, it is connect-
ed to an external schrader port.
WARNING
Ha za rd o u s Vo lt a g e !
Dis c o n n e c t a ll e le c t ric p o w e r, in -
c lu d in g re m o t e d is c o n n e c t s b e -
fo re s e rvic in g . Fo llo w p ro p e r
lo c k o u t /t a g o u t p ro c e d u re s t o e n -
s u re t h e p o w e r c a n n o t b e in a d -
ve rt e n t ly e n e rg ize d . Fa ilu re t o
d is c o n n e c t p o w e r b e fo re s e rvic -
in g c o u ld re s u lt in d e a t h o r s e ri-
o u s in ju ry.
If the low pressure cutout is not
changed when the freezestat is
changed, problem s will occur. If the 35
psig low pressure cutout is connected
to a 20°F freezestat, the unit will go out
repeatedly on the low pressure cutout.
If the 7 psig low pressure cutout is
used with the 35°F freezestat, no prob-
lem s will occur as long as the freez-
estat is operating norm ally. However,
if the freezestat does fail, the loop wa-
ter could freeze before the suction
pressure dropped low enough for the
7 psig cutout to take the unit off the
line. Also, in a loss of charge situation,
the heat exchanger would freeze be-
fore the freezestat could take the unit
off-line.
Units can be ordered from the factory
with either the 35°F or 20°F freezestat
option. The 20°F freezestat is ONLY
used on closed loop system s with an-
tifreeze solution. The 35°F freezestat is
used on all other system s. The type of
freezestat on a unit can be determ ined
from the appropriate digit in the m odel
num ber. Digit 11 and/or 12 with a se-
lection of 1 is a 35°F freezestat, where-
as selection 2 is a 20°F freezestat.
Ch a n g in g a Fre e ze s t a t a n d Lo w
P re s s u re Cu t o u t
The freezestat is located in the top of
the source-side water-to-refrigerant
heat exchanger leaving water line. The
freezestat is located in the twelve
o’clock position. The capillary tube is
inserted into the well approxim ately 8-
inches. Rem ove the existing freezestat
and replace it with the new freezestat.
Wh a t Fre e ze s t a t S h o u ld Be
Ap p lie d ?
As previously m entioned, every unit is
shipped from the factory with two low
pressure cutouts installed in the refrig-
erant circuit. One of the low pressure
cutouts disables the com pressor at 35
psig, while the other disables the com -
pressor at 7 psig. The 35 psig cutout is
used with the 35°F freezestat, while
the 7 psig cutout is used with the 20°F
freezestat.
Note: The wires m ust be m oved from
one low
pressure
cutout to
the other.
The low pres-
sure cutouts are located in
the insu-
lated re-
Occasionally it will be necessary to
change the freezestat in the field. Ex-
am ples of when this change-out is
necessary include:
frigerant
lines. The high
pressure cutout is locat-
ed in the un-insulated
com pressor dis-
charge line and is the
only pressure cutout located
in this line. Change the wires from
(1 ) A unit with a 35°F freezestat is go-
ing to be put on a closed loop system
with antifreeze. By definition, the unit
requires a 20°F freezestat.
Figure 11: Pressure switch location
18
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Ele c t ric a l
Re q u ire m e n t s
Ta b le E-1 : Ele c t ric a l p e rfo rm a n c e WP WD/EXWA
Mo d e l/MBH
VOLTS -AC/HZ/P H
Min .
Ut il.
Vo lt
Ma x Co m p re s s o r LRA
No .
o f
Wit h o u t De s u p
Wit h De s u p
Ut il.
Vo lt
Ea c h
RLA
MCA
Ma x
Fu s e
25
De s u p
MCA
Ma x
Fu s e
25
Co m p
RLA
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
0.4
--
WPWD024
208-230/60/1
220-240/50/1
265/60/1
197
198
239
197
197
198
239
342
414
197
197
198
239
342
414
197
197
342
414
197
197
342
414
517
197
197
342
414
517
342
197
207
414
518
253
264
292
253
253
264
292
456
506
253
253
264
292
456
506
253
253
456
506
253
253
456
506
633
253
253
456
506
633
456
229
253
506
633
11.4
9.6
56.0
47.0
47.0
73.0
63.0
71.0
71.0
31.0
31.0
95.0
77.0
83.0
83.0
39.0
39.0
109.0
88.0
44.0
44.0
169.0
123.0
49.5
49.5
40.0
169.0
137.0
62.0
62.0
50.0
133.0
232.0
261.0
112.0
92.0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
14.3
12.0
12.0
18.8
13.4
17.9
17.9
6.3
14.7
12.4
12.4
19.2
13.8
18.3
18.3
6.7
20
20
9.6
20
20
WPWD036
208-230/60/1
208-230/60/3
220-240/50/1
265/60/1
15.0
10.7
14.3
14.3
5.0
30
30
20
20
30
30
30
30
380-415/50/3
460/60/3
15.0
15
15.0
15
5.0
6.3
6.7
WPWD042
208-230/60/1
208-230/60/3
220-240/50/1
265/60/1
18.4
11.4
16.4
16.4
5.7
23.0
14.3
20.5
20.5
7.1
40
23.4
14.7
20.9
20.9
7.5
40
25
25
35
35
35
35
380-415/50/3
460/60/3
15.0
15
15.0
15
5.7
7.1
7.5
WPWD048
WPWD060
208-230/60/1
208-230/60/3
380-415/50/3
460/60/3
20.4
13.9
7.1
25.5
17.4
8.9
45
25.9
17.8
9.3
45
30
30
15.0
15
15.0
15
7.1
8.9
9.3
208-230/60/1
208-230/60/3
380-415/50/3
460/60/3
28.0
20.0
7.5
35.0
25.0
9.4
60
35.4
25.4
9.8
60
45
45
15.0
15
15.0
15
7.5
9.4
9.8
575/60/3
6.4
8.0
15
8.4
15
WPWD072
208-230/60/1
208-230/60/3
380-415/50/3
460/60/3
32.1
19.3
10.0
10.0
7.8
40.1
24.1
12.5
12.5
9.8
70
40.5
24.5
12.9
12.9
10.2
--
70
40
40
20.0
20
20.0
20
575/60/3
15
15
EXWA180
EXWA240
380-415/50/3
208/60/3
16.7
31.7
31.7
14.1
11.2
37.58
71.39
71.39
31.73
25.24
50
--
100
100
45
--
--
--
230/60/3
--
--
--
460/60/3
--
--
--
575/60/3
35
--
--
--
Ta b le E-2 : Ele c t ric a l p e rfo rm a n c e GS WD
Mo d e l/MBH
VOLTS -AC/HZ/P H
Min .
Ut il.
Vo lt
Ma x
Co m p re s s o r
Da t a
No .
o f
Au x
De s u p
Ut il.
Vo lt
P u m p
Am p s
P u m p
MCA
Ma x
Co m p
RLA
11.4
15.0
18.4
20.4
28.0
32.1
LRA
56.0
RLA
0.4
0.4
0.4
0.4
0.4
0.4
Fu s e
25
GSWD024
GSWD036
GSWD042
GSWD048
GSWD060
GSWD072
208-230/60/1
208-230/60/1
208-230/60/1
208-230/60/1
208-230/60/1
208-230/60/1
197
197
197
197
197
197
253
253
253
253
253
253
1
1
1
1
1
1
2.5
2.5
2.5
2.5
2.5
2.5
17.2
21.7
25.9
28.4
37.9
43.0
73.0
35
95.0
40
109.0
169.0
169.0
45
60
70
WSHP-SVX02A-EN
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P re -S t a rt
Ch e c k lis t
P re -S t a rt -u p Ch e c k lis t
Before energizing the unit, the following system devices must be checked:
____ Is the high voltage power supply correct and in accordance with the nameplate ratings?
____ Is the field wiring and circuit protection the correct size?
____ Is the low voltage control circuit wiring correct per the unit wiring diagram?
____ Is the piping system clean/complete and correct? (A recommendation of all system flushing of debris from the water-
to-refrigerant heat exchanger, along with air purging from the water-to-refrigerant heat exchanger be done in accor-
dance with the Closed-Loop/Ground Source Heat Pump Systems Installation Guide).
____ Is vibration isolation provided? (i.e. unit isolation pad, hosekits)
____ Is unit serviceable? (See clearance specifications on page 6).
____ Are the low/high-side pressure temperature caps secure and in place?
____ Are all the unit access panels secure and in place?
____ Is the thermostat in the OFF position?
____ Is the water flow established and circulating through all the units?
____ Is the zone sensor correctly wired and in a good location?
____ Has all work been done in accordance with applicable local and national codes?
____ Has heat transfer fluid been added in the proper mix to prevent freezing in closed system application?
20
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S e q u e n c e
o f Op e ra t io n
In it ia l Un it S t a rt -u p
Start-up with the system controls is included below: Note: Air Handlers should not be operated in the construction phase of dry
walling. The air-to-refrigerant coil will foul, and the warranty will be void.
1.Set the system control to the desired mode of operation.
2.Set the control switch to fans and circulation pumps. The compressor should NOT run.
3.Reduce the temperature control setting until the compressor, reversing valve, solenoid valve, and loop pump are
energized. Adjust water flow utilizing pressure/temperature plugs and comparing to tables contained in specification
sheet data. Water leaving the heat exchanger should be warmer than the entering water temperature (approximately
9°F-12°F); compressor amps should be within data plate ratings; the suction line should be cool with no frost
observed in the refrigerant circuit.
4.Check the cooling refrigerant pressures against values in Table OP1. (Page 22).
5.Turn the system control switch to the OFF position. Unit should stop running and the reversing valve should de-ener-
gize.
6.Leave unit off for approximately FIVE minutes to allow for pressure equalization.
7.Turn the thermostat to the lowest setting.
8.Set the thermostat system switch to the opposite mode of operation.
9.Adjust the temperature setting upward until the unit is energized. A water temperature decrease of approximately 5°F-
9°F leaving the heat exchanger should be noted. The compressor operation should be smooth with no frost observed
in the refrigeration circuit.
10.Check the heating refrigerant pressures against values in Table OP1. (Page 22)
11.Set the system control to maintain the desired space temperature.
12.Instruct the owner on system operation.
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Op e ra t in g P re s s u re s
Op e ra t in g P re s s u re s
Table OP-1: Cooling m ode operating pressures
Unit Size
Entering
Load
Entering Source Temperature (Degree F)
86
50
104
Discharge
(Degree F)
Suction
Pressure
46-56
Discharge
Pressure
103-143
111-151
Suction
Pressure
49-59
Discharge
Pressure
188-228
205-245
Suction
Pressure
49-59
Pressure
238-278
259-299
EXWA 240
EXWA 240
53.6
86
61-71
84-94
87-97
Table OP-2: Heating m ode operating pressures
Unit Size
Entering
Load
Entering Source Temperature (Degree F)
68
50
104
(Degree F)
Suction
Pressure
46-56
Discharge
Pressure
160-200
245-285
310-350
Suction
Pressure
65-75
Discharge
Pressure
170-210
254-294
320-360
Suction
Pressure
86-96
Discharge
Pressure
183-223
268-308
333-373
EXWA 240
EXWA 240
EXWA 240
75
104
122
49-59
68-78
94-107
95-105
49-59
68-78
22
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Op e ra t in g P re s s u re s
Wa t e r P re s s u re Dro p
Tables 6 and 7 should be used to define feet of head/pressure drop. Note: To calculate feet of head, when using gauges that read in PSIG,
m ultiply PSI by 2.31.
Table 7: Heating water pressure drops (WPD) in feet of head
Table 6: Cooling water pressure drops (WPD) in feet of head
Source
Load
Ft. Head
Source
Load
Ft. Head
Unit Size
Unit Size
GPM
EWT
Ft. Head
Pressure
1.3
EWT
F
GPM
EWT
Ft. Head
Pressure
1.5
EWT
F
F
Pressure
1.6
F
Pressure
1.3
3.8
7.0
8.9
4.6
8.5
10.8
5.2
9.5
12.1
6.0
11.0
14.0
7.6
14.0
17.8
8.7
16.0
20.4
30.0
55.0
70.0
3.8
7.0
8.9
4.6
8.5
10.8
5.2
9.5
12.1
6.0
11.0
14.0
7.6
14.0
17.8
8.7
16.0
20.4
30.0
55.0
70.0
024
036
042
048
060
072
240
80
4.5
7.2
1.9
6.6
53.6
53.6
53.6
53.6
53.6
53.6
53.6
5.4
8.7
2.3
7.9
024
036
042
048
060
072
240
60
5.1
8.3
2.2
7.6
80
80
80
80
80
80
80
4.5
7.2
1.9
6.6
10.6
2.4
8.6
14.1
3.3
11.6
19.1
5.4
19.1
31.5
7.1
25.3
41.8
2.9
80
80
80
80
80
80
60
60
60
60
60
60
10.6
2.4
12.7
3.0
10.3
17.1
4.0
14.0
23.1
6.5
23.1
38.1
8.6
30.5
50.5
3.6
9.7
14.7
12.2
2.8
8.6
9.8
14.1
3.3
11.6
19.1
5.4
19.1
31.5
7.1
25.3
41.8
2.9
16.2
3.8
13.3
21.9
6.2
21.9
36.1
8.2
28.9
47.9
3.4
8.1
9.2
8.1
12.2
12.2
13.9
Wa t e r Vo lu m e
Table 8 is provided for use in calculating glycol requirem ents for the unit.
Table 8: Water volum e
Water Side Water Side Water Side
Unit Size
Volume
Cubic In.
55
105
105
259
259
259
1057
Volume
Cubic Ft.
0.032
0.061
0.061
0.150
0.150
0.150
0.615
Volume
Gallons
0.238
0.455
0.455
1.121
1.121
1.121
4.576
024
036
042
048
060
072
240
Note: The EXWA 240 has two circuits.
Flo w Ch e c k s
For the operating tem perature drop (heating) and rise (cooling), refer to Table OP1 and OP2 for the proper water tem pera-
ture change. Depending on the unit size, entering water tem perature and water flow rate, the cooling tem perature rise is
from 8°F-16°F. Based on the sam e criteria for heating, the tem perature drop is from 2°F-13°F.
P re s s u re
Using the P/T ports and one 0-60 psi pressure gauge with the P/T port adapter, m easure the pressure difference between
the water-in and water-out connections. Com pare the pressure differential to Table 6 to determ ine flow.
S t a rt -u p Ch e c k lis t a n d Lo g
Use the form on page 24 to log system and unit tem peratures during start-up.
WSHP-SVX02A-EN
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S t a rt -u p Ch e c k lis t
a n d Lo g
In s t a llin g Co n t ra c t o r: Use this form to thoroughly check-out the system and units before and during
start-up. (This form need not be returned to the factory unless requested during technical service support).
J o b Na m e :
Mo d e l Nu m b e r:
Da t e :
S e ria l Nu m b e r:
In order to m inim ize troubleshooting and costly system failures, com plete the following checks and data
entries before the system is put into full operation.
HEAT
Load
COOL
Load
MODE
Source
Source
Entering fluid tem perature
Leaving fluid tem perature
Tem perature differential
F
F
F
F
F
F
F
F
F
F
F
F
Water coil heat exchanger
(Water Pressure IN)
PSIG
PSIG
PSIG
PSIG
PSIG
PSIG
PSIG
PSIG
PSIG
PSIG
PSIG
PSIG
Water coil heat exchanger
(Water Pressure OUT)
Pressure Differential
COMP RES S OR
Am ps
Volts
Discharge line tem perature
F
F
F
F
(after 10 m inutes)
24
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Ma in t e n a n c e
P re ve n t ive Ma in t e n a n c e
WARNING
Ha za rd o u s
Ch e m ic a ls !
Maintenance on the unit is sim plified
with the following preventive sugges-
tions:
Co il c le a n in g a g e n t s c a n b e e it h e r
a c id ic o r h ig h ly a lk a lin e . Ha n d le
c h e m ic a l c a re fu lly. P ro p e r h a n -
d lin g s h o u ld in c lu d e g o g g le s o r
fa c e s h ie ld , c h e m ic a l re s is t a n t
g lo ve s , b o o t s , a p ro n o r s u it a s re -
q u ire d . Fo r p e rs o n a l s a fe t y, re fe r
t o t h e c le a n in g a g e n t m a n u fa c t u r-
e rs Ma t e ria ls S a fe t y Da t a S h e e t
a n d fo llo w a ll re c o m m e n d e d s a fe
h a n d lin g p ra c t ic e s . Fa ilu re t o fo l-
lo w a ll s a fe t y in s t ru c t io n s c o u ld
re s u lt in d e a t h o r s e rio u s in ju ry.
WARNING
Ha za rd o u s
Vo lt a g e !
Dis c o n n e c t a ll e le c t ric p o w e r, in -
c lu d in g re m o t e d is c o n n e c t s b e -
fo re s e rvic in g . Fo llo w p ro p e r
lo c k o u t /t a g o u t p ro c e d u re s t o e n -
s u re t h e p o w e r c a n n o t b e in a d -
ve rt e n t ly e n e rg ize d . Fa ilu re t o
d is c o n n e c t p o w e r b e fo re s e rvic -
in g c o u ld re s u lt in d e a t h o r s e ri-
o u s in ju ry.
It should be noted that the water qual-
ity should be checked periodically. See
Table 9.
Check the contactors and relays within
the control panel at least once a year.
It is good practice to check the tight-
ness of the various wiring connections
within the control panel.
Table 9: Water Quality Table
Scaling
Calcium and magnesium
Less than 350 ppm
(total hardness)
Corrosion
A strainer (60 m esh or greater) m ust
be used on an open loop system to
keep debris from entering the unit heat
exchanger and to ensure a clean sys-
tem .
pH
7-9.5
Hydrogen Sulfide
Sulfates
Less than 1 ppm
Less than 25 ppm
Less than 125 ppm
Less than 75 ppm
Chlorides
For units on well water, it is im portant
to check the cleanliness of the water-
to-refrigerant heat exchanger. Should
it becom e contam inated with dirt and
scaling as a result of bad water, the
heat exchanger will have to be back
flushed and cleaned with a chem ical
that will rem ove the scale. This service
should be perform ed by an experi-
enced service person.
Carbon Dioxide
Total dissolved solids
(TDS)
Less than 1000 ppm
Biological Growth
Iron Bacteria
Low
Low
Erosion
Suspended Solids
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Wa rra n t y
In fo rm a t io n
Wa rra n t y In fo rm a t io n
S t a n d a rd Wa rra n t y
The standard water-source heat pum p warranty is Trane’s parts-only warranty, running 12-m onths from star-
tup, not to exceed 18-m onths from shipm ent.
Ext e n d e d Wa rra n t y
The optional extended warranty is a second through fifth year warranty. The tim e starts at the end of standard
1-year coverage through the fifth year.
These extended warranties apply only to new equipm ent installed in dom estic Trane Com m ercial System s
Group sales territories and m ust be ordered prior to start-up.
26
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Tro u b le s h o o t in g
Ge n e ra l Op e ra t io n
WARNING
The standard m odel is designed for in-
door installation. When the unit is in-
stalled in an unconditioned space, the
unit m ay not start in cool weather (ap-
proxim ately 45°F). It m ay then be nec-
essary to start the unit in the cooling
m ode for three to five m inutes. The
unit m ay then be shut-off (there will be
a two m inute tim e-out of the unit), and
restarted in the heating m ode. The
freeze protection therm ostat should
also be checked as it m ay be adversely
affected by am bient tem perature.
Like any other type of m echanical
equipm ent, the unit perform s best
when it is well m aintained.
Ha za rd o u s S e rvic e
P ro c e d u re s !
Th e m a in t e n a n c e a n d t ro u b le
s h o o t in g p ro c e d u re s re c o m m e n d -
e d in t h is s e c t io n o f t h e m a n u a l
c o u ld re s u lt in e xp o s u re t o e le c t ri-
c a l, m e c h a n ic a l o r o t h e r p o t e n t ia l
s a fe t y h a za rd s . Alw a ys re fe r t o
t h e s a fe t y w a rn in g s p ro vid e d
t h ro u g h o u t t h is m a n u a l c o n c e rn -
in g t h e s e p ro c e d u re s . Wh e n p o s s i-
b le , d is c o n n e c t a ll e le c t ric a l
p o w e r in c lu d in g re m o t e d is c o n -
n e c t s b e fo re s e rvic in g . Fo llo w
p ro p e r lo c k o u t /t a g o u t p ro c e d u re s
t o e n s u re t h e p o w e r c a n n o t b e in -
a d ve rt e n t ly e n e rg ize d . Wh e n n e c -
e s s a ry t o w o rk w it h live e le c t ric a l
c o m p o n e n t s , h a ve a q u a lifie d li-
c e n s e d e le c t ric ia n o r o t h e r in d i-
vid u a l w h o h a s b e e n t ra in e d in
h a n d lin g live e le c t ric a l c o m p o -
n e n t s p e r t h e s e t a s k s . Fa ilu re t o
fo llo w a ll o f t h e re c o m m e n d e d
s a fe t y w a rn in g s p ro vid e d , c o u ld
re s u lt in d e a t h o r s e rio u s in ju ry.
Op e ra t io n w it h a Co n ve n t io n a l
Th e rm o s t a t
The unit is equipped with safety con-
trols, including high pressure control,
low pressure control and a freeze pro-
tection therm ostat, set to shut off the
com pressor under abnorm al tem pera-
ture or pressure conditions. If the safe-
ties shut off the com pressor, a lockout
relay prevents short cycling from the
abnorm al condition. When conditions
are corrected, the lockout control can
be reset by setting the therm ostat sys-
tem switch to OFF wait a few m inutes
for the system pressure to equalize,
and then return to HEAT or COOL. If
the condition continues, an authorized
service person should check out the
unit.
P re lim in a ry Tro u b le In s p e c t io n
If operational difficulties are encoun-
tered, be sure to perform the prelim i-
nary checks before referring to the
troubleshooting chart on page 28.
• Verify that the unit is receiving elec-
tric supply power.
• Ensure that the fuses in the fused
disconnect are intact.
After com pleting the prelim inary
checks, inspect the unit for other obvi-
ous problem s such as leaking connec-
tion, broken or disconnected wires,
etc. If everything appears to be in or-
der, but the unit still fails to operate
properly, refer to the troubleshooting
chart on page 28.
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Tro u b le s h o o t in g
Ch e c k lis t
Problem
Heating Cooling Cause
Correction
Check fuses
Replace
X
X
X
X
X
X
X
X
X
X
X
X
Main power off
Defective control transformer
Broken or loose connection
Defective thermostat
No response to any
thermostat setting
Repair
Replace
Transformer
Reset Transformer
Relocate
Unit short cycles
Thermostat or sensor improperly located
Locate leak, repair and recharge by
weight (not by superheat)
X
X
Low on refrigerant charge
X
X
X
X
X
X
X
X
X
X
X
X
X
Restricted thermal expansion valve
Defective reversing valve
Thermostat improperly located
Unit undersized
Replace
See WSHP-IOM-# for touch test chart
Relocate
Insufficient capacity
Recalculate heat gains/losses
Increase GPM
Inadequate water flow
Scaling in heat exchanger
Water too hot
Clean or replace
Decrease temperature
Increase temperature
Increase water flow to unit
Decrease temperature
Decrease charge
X
Water too cold
X
X
X
X
X
X
X
X
X
X
X
Inadequate GPM
Water too hot
High pressure switch open
X
X
Overcharged with refrigerant
Defective pressure switch
Trash in heat exchanger
Low water flow
Check or replace
Backflush
Increase GPM
High head pressure
X
X
X
X
X
X
X
X
X
X
Overcharge of refrigerant
Non-condensable in system
Water too hot
Decrease charge
Evacuate and recharge by weight
Decrease temperature
Locate leak, repair and recharge
Repair / replace
Undercharged
Low suction pressure
Restricted thermal expansion valve
Inadequate GPM
Increase GPM
Inadequate GPM
Increase GPM
Water too cold
Increase temperature
Increase charge
X
X
Undercharged with refrigerant
Defective pressure switch
Replace
Low Pressure switch open
Raise water temperature. For smaller
tonnage units, switch pressure switch
wires from 35 psig to 7 psig
X
X
Heat transfer fluid too cold
X
X
X
Inadequate GPM
Water too cold
Increase GPM
Increase GPM
X
Defective freezestat
Replace freezestat
Freezestat open
Replace freezestat. For smaller tonnage
units, switch pressure wires from 35 psig
to 7 psig.
X
Heat transfer fluid too cold
28
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Un it Wirin g
2 -t o n t h ro u g h 6 -To n Eq u ip m e n t
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Un it Wirin g
2 0 -To n Eq u ip m e n t
30
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Literature Order Num ber
File Num ber
WSHP-SVX02A-EN
SV-UN-WSHP-SVX02A-8-02
WSHPC-IOM-4 and 72-9036-02
Inland
Supersedes
Tra n e
Stocking Location
An Am e ric a n S t a n d a rd Co m p a n y
w w w .t ra n e .c o m
Since Trane has a policy of continuous product and data im provem ent and reserves the right to change
design and specifications without notice.
For m ore inform ation, contact
your local district office or e-m ail us at
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