TIUIHE
It's Hard To Stop A Trane?
INSTALLER'S
GUID
Model:
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Supersedes
18-BC39D6-4
TWX018-0240, TWX030-048D & TWX060C Heat Pumps
IMPORTANT -- This Document is customer property and is to remain with this unit. Please return to service information pack
upon completion of work.
These instructions do not cover all variations in systems
nor provide for every possible contingency to be met in
connection with installation. All phases of this installa-
tion must comply with NATIONAL, STATE AND LOCAL
CODES. Should further information be desired or should
particular problems arise which are not covered sufficiently for
the purchaser's purposes, the matter should be referred to your
installing dealer or local distributor.
A. GENERAL
©
NOTICE: These outdoor units may be used with indoor
units equipped with Capillary Tube, Thermostatic Ex-
pansion Valve or the Accutron TM Flow Control Check
Valve (F.C.C.V.) assembly for refrigerant flow control.
Check for transportation damage alter unit is uncrated. Report
promptly, to the carrier, any damage fbund to the unit.
To determine the electrical power requirements of the unit, refer
to the nameplate of the unit. The electrical power available must
agree with that listed on the nameplate.
The Weathertron ®Heat Pump has been designed and manufac-
tured to withstand and operate in severe winter conditions.
However, there are precautionary steps which should be taken at
the time of installation which will help assure the efficient
operation of the unit. It is recommended that these precau-
tions be taken for units being installed in areas where
snow accumulation and prolonged below freezing tem-
peratures occur.
1. Units should be elevated 3 to 12 inches above the pad or
rooftop, depending on local weather. This additional height will
allow be tter dra inclge of snow and ice (melted during del)'ost cycle)
prior to its refPeezing. This should prevent a build-up of ice
around the unit which occurs when unit is not elevated. Insure
that drain holes in unit base pan are not obstructed
preventing draining of defrost water.
2. If possible, avoid locations that are likely to accumulate snow
drills. If not possible, a snow drill barrier should be installed
around the unit to prevent a build-up of snow on the sides of the
unit and should be of sufficient distance from the unit to prevent
restriction of airflow to and li'om the unit. Also allow for proper
maintenance space. The barrier should be constructed of mate-
rials which will blend in with the building design.
3. Avoid locating the unit where condensation and freezing of
defrost vapor may annoy the customer. For instance, installing
the unit under a bedroom, kitchen, or picture window may be
annoying to the customer since condensate and lbg will occur
during the defrost cycle.
4. Avoid locating the unit under the eaves or other overhead
structures as sizeable icicles may form and the unit may be
damaged by these falling icicles.
Since The Trane Company has a policy of continuous
© American Standard Inc. 2000 right to change design and specifications without notice.
product and product data improvement, it reserves the
INSTALLER'S GUIDE
B. LOCATION & PREPARATION OF THE UNIT
1. The unit should be set on a level support pad at least as large
as the unit base pan.
2. The support pad must NOT be in direct contact with any
structure. The unit must be positioned a minimum of 12" from
any wall or surrounding shrubbery to insure adequate airflow.
A 30" clearance must be provided in front of control box (access
panels) & any other side requiring service access to meet
National Electrical Code. The unit must be far enough away
fl'om any structure to prevent excess roof run-off water fi'om
pouring directly on the unit.
3. These units are shipped with (4) 4" mounting legs and
(8) robber isolators. Loosen two screws on each corner and slide
slots in mounting leg under head of screws (as illustrated in
Figure 2) and tighten: do this at all four corners.
4. Vibration isolaters (shipped with unit) should be used if
location requires vibration isolation. Place supplied mounting
pads under unit corner legs as illustrated in Figure 2.
5. When the outdoor unit is mounted on a roof, be sure the roof
will support the unit's weight. Properly selected vibration
isolators are recommended to prevent transmission to the build-
ing structure.
6. The maximum length of refrigerant lines li'om outdoor to
indoor unit should NOT exceed sixty (60) feet.
7. Maximum diffbrence in elevation should not exceed sixty
(60) feet.
NOTE: Refer to '_e[i_gerant Pipir_ Software'; Pub. No. 32-3312-01.
8. Locate and install indoor coil or blower coil in accordance with
instruction included with that unit.
9. A pull-thru hole for the refrigerant lines should be provided
of sufficient size to allow the passage of both liquid and suction
lines.
@
UNIT LEG & ISOLATOR LOCATION
NIT UNIT LEG
\ _ ISOLATORS
LOOSEN TWO SCREWS AND
SLIDE SLOT OF LEG UNDER
HEAD OF SCREWS AND TIGHTEN
(2 PER LEG)
PAD
(_ BRAZE TYPE INDOOR END
SEALING CAP
COMPONENTS
ACCUTRONTU
_' FLOW CONTROL
CHECK VALVE
(F.C.C.V.) ORIFICE
LIQUID LINE
FIELD SUPPLIED
10. Determine if adequate power supply is available and correct
according to nameplate specifications.
11. Install the unit in accordance with national, state, and local
codes.
C. ACCUTRON TM FLOW CONTROL VALVE
If the indoor unit System Refrigerant Flow control is an
Accutron TM orifice and check valve assembly, an orifice size
change ,nay be necessary.
The outdoor model determines the required orifice size. Check
the listed orifice size on nameplate of the selected outdoor model.
If the indoor unit is lhctory shipped with a different orifice size,
the orifice must be changed to obtain system rated performance.
IMPORTANT: The outdoor unit is shipped with the proper size
orifice and a stick-on orifice size label in an envelope attached to
the outdoor unit. Outdoor unit nameplate will have correct
orifice size specified as BAYFCCV --- A for rated perlbrmance.
D. INSTALLING REFRIGERANT LINES
Pressure taps are provided on the service valve plate and on
service valve of outdoor unit Ibr compressor suction and liquid
pressures.
The indoor end of recommended refrigerant line sets may be
straight or with a 90 degree bend, depending upon situation
requirements. This should be thoroughly checked out before
ordering refrigerant line sets.
The gas line must always be insulated.
The units are factory charged with the system charge required
when using fifteen (15) feet of connecting line. Unit nameplate
charge is the same. Final refl'igerant charge adjustment is
necessary, use the Charge Charts in the outdoor unit Service
Facts.
TYPICAL 4 CORNERS
2. Consider types of bends to be made and space limitations.
PAGE 2 Pub. No. 18-BC39D6-4
1. Determine the most practical way to run the lines.
G
LIQUID LINE SERVICE VALVE
<,.
UNIT SIDE OF
SERVICE VALVE
LIQUIDLINE
HEX HEADED
CONNECTION
RETAINING RING
NOTE: Large diameter tubin_ will be very di[f_cult to rebend once
it has been shaped,
3. Determine the best starting point for routing the refrigerant
tubing-INSIDE OR OUTSIDE THE STRUCTURE.
4. Provide a pull-thru hole of sufficient size to allow both liquid
and gas lines plus fittings to dear. The location of this hole (if
practical) should be just above the wall plate which is resting on
the foundation.
5. Be sure the tubing is of sufficient length.
6. Uncoil the tubing --- do not kink or dent.
7. Route the tubing making all required bends and properly
secure the tubing before making connections.
@
GAS LINE SERVICE VALVE
CAP _ ,[--'J, 1/4 TURN ONLY
_ _-_//_- POSITION
UNIT SiDE
OF VALVE
PRESSURE TAP PORT /
GAS LiNE CONNECTION
CAP _
COUNTERCLOCKWISE
FOR FULL OPEN
VALVE STEM
¢
/
INSTALLER'S GUIDE
8. To prevent a noise within the building structure due to
vibration transmission from the refrigerant lines, the following
precautions should be taken:
a. When the refrigerant lines have to be fastened to floor
joists or other framing in a structure, use isolation type hangers.
b. Isolation hangers should also be used when refrigerant
lines are run in stud spaces or enclosed ceilings.
c. Where the refrigerant lines run through awall or sill, they
should be insulated and isolated.
d. Isolate the lines from all ductwork.
E. SERVICE VALVE OPERATION
BRASS LIQUID LINE SERVICE VALVE OPERATION
The Brass Liquid Line Service Valve is factory shipped in the
seated position to hold Ihctory charge. The pressure tap service
port (when depressed) opens only to the field brazing side of the
valve when the valve is in the seated position. The liquid line
valve is not a back seating valve (see WARNING below).
WARNING: Extreme caution should be ex-
ercised so the internal steel stem retaining ring is not
damaged by backing out the valve stem when opening the
valve. If the valve stem is forced out past the retaining
ring, system pressure could force the valve stem out of the
valve body. If the retaining ringis missing, do not attempt
to open the valve. See Figure 4.
BRASS GAS LINE BALL SERVICE VALVE
The Brass Gas Line Ball Service Valve is shipped in the closed
position to hold the factory refrigerant charge. The pressure tap
service port (when depressed) opens only to the field brazing side
when the valve is in the closed position.
The Gas Line Service Valve is lull open with a 1/4 turn counter-
clockwise. See Figure 5.
BRAZING REFRIGERANT LINES
1. Before brazing, remove plugs from external copper stub
tubes. Clean internal and external surfaces of stub tubes prior
to brazing.
2. Cut and fit tubing minimizing the use of sharp 90 ° bends.
3. Insulate the entire gas line and its fittings.
4. Do NOT allow uninsulated liquid line to come in direct
contact with bare gas line.
5. Precautions should be taken to avoid heat damage to
the pressure tap valve core during brazing. It is recom-
mended that the pressure tap port valve core be removed
and a wet rag wrapped around the valve body.
NOTICE: Use care to make sure that no moisture enters
pressure tap port, while wet rag is being used.
6. Remove braze shield from clear plastic bag. Soak pad in
water and place over suction and liquid lines to protect unit
finish. See Figure 6. Discard pad when finished with brazing.
CORE
Pub. No. 18-BC39D6-4 PAGE 3
INSTALLER'S GUIDE
(_ HEAT_
7. Use a Dry Nitrogen Purge and Brazing Alloy without flux
when brazing the field line to the copper factory connection. Flow
dry nitrogen into either valve pressure tap port, thru the tubing
and out the other port while brazing.
8. Braze using accepted good brazing techniques.
LEAK CHECK
CAUTION: In scroll compressor applica-
tions, dome temperatures may be hot. Do not touch top of
compressor, may cause minor to severe burning.
IMPORTANT: Replace pressure tap port valve core be-
fore attaching hoses for evacuation.
After brazing operation of refrigerant lines to both the outdoor
and indoor unit is completed, the field brazed connections must
be checked for leaks. Pressurize through the service valve
ports, the indoor unit and field refrigerant lines with dry
nitrogen to 200 psi. Use soap bubbles or other leak-checking
methods to see that all field joints are leak-free! If not, release
pressure; then repair!
SYSTEM EVACUATION
NOTE: Since the outdoor unit has a re[}'igerant chasge, the gas
and liquid line valves must remain closed.
1. Upon completion ofleak check, evacuate the refrigerant lines
and indoor coil before opening the gas and liquid line valves.
2. Attach appropriate hoses li'om manilbld gauge to gas and
liquid line pressure taps.
NOTE: Unnecessary switchin¢ of hoses can be avoided and
complete evacuation of all lines leadin_ to sealed system can be
accomplished with manifSld center hose and connecting branch
hose to a cylinder of HCFC-22 and vacuum pump.
3. Attach center hose of manifbld gauges to vacuum pump.
4. Evacuate until the micron gauge reads no higher than
350 microns.
5. Close off valve to vacuum pump and observe the micron
gauge. If gauge pressure rises above 500 microns in one (1)
minute, then evacuation is incomplete or system has a leak.
6. If vacuum gauge does not rise above 500 microns in one (1)
minute, the evacuation should be complete.
7. With a vacuum pump and micron gauge blanked off, open
valve on HCFC-22 cylinder and charge refrigerant lines and
indoor coil with vapor to tank pressure of HCFC-22 supply.
NOTE: DO NOT VENT REFRIGERANT INTO THE
ATMOSPHERE.
8. Close valve on HCFC-22 supply cylinder. Close valves on
manifold gauge set and remove refrigerant charging hoses from
liquid and gas pressure tap ports.
NOTE: A 3/16" Allen wrench is required to open liquid line
service valve. A 1/4" Open End or Adjustable wrench is required
to open gas line valve. An Adjustable or 3/4" Open End wrench
is required to take off the valve stem cc_p.
9. The liquid line shut-off valve can now be opened. Remove
shut-off valve cap. Fully insert hex wrench into the stein and
backout counterclockwise until valve stem just touches retainer
ring (approximately five (5) turns) observing WARNING state-
ment. See Figure 4.
10. Replace liquid service pressure tap port cap and valve stem
cap. These caps MUST BE REPLACED to prevent leaks.
Replace valve stein and pressure tap cap finger tight, then
tighten an additional 1/6 turn.
11. The gas valve can now be opened. For a ball type gas valve,
open the valve by removing the shut-off valve cap and turning
the valve stem 1/4 turn counterclockwise. See Figure 5. For brass
gas line service valve opening, fbllow items 9 & 10 above.
12. The gas valve is now open for refrigerant flow. Replace valve
stem cap to prevent leaks. See Figures 4 & 5.
If may be necessary to adjust system refrigerant charge upon
completion of installation. System should be operated and
checked for proper charge.
F. ELECTRICAL CONNECTIONS
A WARNING: When installing or servicing
this equipment, ALWAYS exercise basic safety precau-
tions to avoid the possibility of electric shock.
1. Power wiring and grounding of equipment must comply with
local codes.
2. Power supply must agree with equipment nameplate.
3. Install a separate disconnect switch at the outdoor unit.
4. Ground the outdoor unit per local code requirements.
5. Provide flexible electrical conduit whenever vibration trans-
mission may create a noise problem within the structure.
PAGE 4 Pub. No. 18-BC39D6-4
INSTALLER'S GUIDE
6. The use of color coded low voltage wire is recommended to
simpliI_ connections between the outdoor unit, the thermostat,
and the indoor unit.
Table 1 --- NEC Class II Control Wiring
24 VOLTS
WIRE SIZE MAX. WIRE LENGTH
*22 AWG 30 FT.
20 AWG 100 FT.
18 AWG 150 FT
16 AWG 225 FT.
14 AWG 300 FT.
*If 22 AWG is used, make sure it is high quality wire.
7. Table I defines maximum total length of low voltage wiring
fi'om outdoor unit, to indoor unit, and to thermostat.
8. Mount the indoor thermostat in accordance with instruction
included with the thermostat. Wire per appropriate hook-up
diagram (included in these instructions).
G. ELECTRICAL HEATERS
Electric heaters, if used, are to be installed in the air handling
device according" to the instructions accompanying the air handler
and the heaters.
H. DEFROSTCONTROL
The demand defrost control measures heat pump outdoor ambi-
ent temperature with a sensor located outside the outdoor coil.
A second sensor located on the outdoor coil is u sed to measure the
coil temperature. The difference between the ambient and the
colder coil temperature is the difference or delta-T measure-
ment. This delta-T measurement is representative of the oper-
ating state and relative capacity of the heat pump system. By
measuring the change in delta-T, we can determine the need for
defrost. The coil sensor also serves to sense outdoor coil tempera-
ture lbr termination of the defi'ost cycle.
FAULT DETECTION
A fault condition is indicated by the flashing light on the defrost
control inside the heat pump control box.
In normal operation, the defrost control light will flash once each
second. If the light is flashing more than once per second or not
at all, rel_r to the service manual for that unit.
PIN IDENTIFICATION (See Figure 7)
1. TEST COMMON (Shorting anyof the other pins to this pin causes
the lunction of the other pin to be executed. Leaving this pin open
results in the nol, nal mode of"operation.)
2. TST = Test (ShortingTEST_COMMON tothispinspeedsupall
defrost board thnings.)
3. FRC DFT = Forced Defrost (ShortTESTCOMMONto thispin
for two (2) seconds to i_litiate a forced defrost. Remove the short 'after
defrost initiates.)
4. IX)WFAN = I_)wspeedFmltestmode(ShortTEST COMMON
to this pin to force the outdoor lhn to low speed. When the short is
removed, the fro1 will go to high speed for approxhnately 15 seconds
and then return to the speed it was running before the short was
applied.)
©
DEFROST CONTROLCHECKOUT
Normal operation requires:
a. LED on board flashing 1 thne/second.
b. 24V AC between R & B
c. 24V AC between Y & B with unit operating
d. Defrost initiation when FRC_DFT pin is shorted to
TESTCOMMON pin.
lfa defi'ost control problem is suspected, refer to the service informa-
tion in control box.
PIN IDENTIFICATION
Z
O
O
o
I
I-,
(D
WARNING: .o connect24VACto
T1 (ODS-A) terminal. ODS-A thermistor WILL BE BLOWN.
I. OPERATIONAL AND CHECKOUTPROCEDURES
Final phases of this installation are the unit Operational and
Checkout Procedures which are fbund on page 8 of this
instruction.
J. COMPRESSOR SUMP HEAT
After all electrical wiring is complete, SET THE THERMOSTAT
SYSTEM SWITCH IN THE OFF POSITION SO COMPRESSOR
WILL NOT RUN, and apply power by closing the system main
disconnect switch. This will activate the compressor sump heat.
Do not change the Thermostat System Switch until power has
been applied long enough to evaporate any liquid of HCFC-22 in
the compressor (30 minutes for each pound of HCFC-22 in the
system as shown on the nmneplate). Following this procedure
will prevent compressor damage at the initial start-up.
Record the "POWER APPLIED DATA" on the designated lines
below:
Time A.M./P.M. Date
By
(SEE WIRING DIAGRAMS)
Electrician
Pub. No. 18-BC39D6-4 PAGE 5
INSTALLER'S GUIDE
A TYPICAL FIELD WIRING DIAGRAM FOR SPLIT SYSTEM HEAT PUMPS
N0[ESr
; POWER _iR]_5 AN0 6R0tI_/O]N5 OF EQUIPMENT
MUSI COMPY WITH r0CAL CODES¸
2 BE SUiiF POWEi! SUPPi v ACREi_S Wii_J
EOU[P#ENT N£MEPL ATE
3 L 0_ VOLT/',0E WIRING TO BE NO i8 AWG
M]_ iMtiM _0_0UC] 0R
4 USE C(}_PFI_ OONi)UCTORS 0NtY
5 POLARIZED Pt. U0 0ii¢ [1O _, PMA IS AT IAC_IE[;
l0 liFA?':ii C0_4f!_0L BOX SEC_ i0_4 I Pi¸ i5
_A(} _0FiY WiI:_E0 IN I 0 AiR HANDI I_R
TEFiMiNAL WP__[tL HAVE i1/I_R_At C0_NECIION5
ONLY IF SrC0ND COM_A010R IS USE0 BY Tli_
H_ATER EOFi C0_ FROLI I_0 POWER [0 Ei{C 1!i iC
HEM iN0 E_M_N_S IF S£OOND IBH_ CON;AOT0_
IS N0[ US_0, _HEk FiiiL0 {10'/_iiC?]0_S 10 W2
CA_ B_ OM]l TED AS £PPROPRIAiE.
ii¸¸ 0[}f JO N01¸ USED, lilEN CONNECT APPROPN]AIE
JUMPER F_0M _i TO W2 ON kYTB
]r I_UMI0iSTAT [5 NOT USFD, CONNrCT JUMPER
_ROM "R" T0 '_K" _0R _Ui I 10N_AOE AIRNi 0W
I_ C00_ iNS
S CONNFC_ I_ THiS _ANNER iF 0D LJ_iT HAS "_"
10 10_/_EC T W3 10 W_ 0_t Y IF bS1_0 i4FA_EI:i _iTli
3 HEA_ER S[AOES
TWXO18-O60 WITH AIR HANDLERS
ODI
_,0 _/! I'WO !,
ii ......
I0 PO¢_E 5(PPY
PER LOCAL CO S
NOTIS (_& 7
AIR i AN LEF/
tUM D[5 AT
NOTE 8
A TYPICAL FIELD WIRING DIAGRAM FOR SPLIT SYSTEM HEAT PUMPS
TWXO18-O60 WITH VARIABLE SPEED AIR HANDLERS
OES:
I POWER #lRh6 ACiD GROUkDINO OF EOJ PME_4T
_US[ COMPLY _1_1LOC,% ¢O_ES
2 BE SUN_ POWER 5UPPi Y AORLE5 _ITH
3 { OW VOLTAOE _[RiN6 TO BE !/0 i8 A_O
MiNimUM OONCUCTOR
4 iJSi_ COP;%R O0;qOdCiONS O_tv
b POLARiZ_[} PLU6 5ECi iON PM A IS Ai _ACliED
TO liEAI_R _O_i_OL BOX, S_O[[Ok I PF IS
FAC[OI/v WIRE[} i_T(} AiR i4A_Oi LR
0 IF 001 iS _()[ USED, 114ENCO_E_ [ APPRO_RI/'TE
JUMPER5 FRO_ Hi i0 W2 AND W3 ON L?T B
7 Ti_NMINAI 5 _2 AN8 _3 Wil I ilAVii IN ILRkAL
CO_EC;iON50_Y iF 2NL)_ ]RDCO_IAC;ORS
ARE USEO BY ]lie H_A[EP, FOR COntROl [ tN8
POWLI! TO ELECTRIC _!FAI U/O _EN]5 JF¸
2NO & 3R_ (Bli & Cli) CON IAC iONS ARE NOT US_O_
Tilden FIEi {) CONN!IC _]0_0 T 0 W2 £Ni) _3 O£N BE
O_ [_'TE O AS APPROPR IA_L.
O CO_N_[C[ ¸ iN THIS MAN_/OR iF¸ 0[} (i_IT liAS
"F" CONNECTION
_L
................. :J
ROOM TiERMOS A
Lr, E I/ _ WILING
V, "_ FEb
_E ""'* /qR I(
From Dwg. 21B800255 Rev. 2
TO POWER SLJPPL Y PER
OCAL COD S&iG D P]_4ED
]N SE 9 WIN]NO TABLE
INTER O0!?PONENT W[Rt3 X t,o
....... ','_ WRIO
FOR 3 Pl
24 V _ FACTORY
4 /. ', :ILl}
;]_1 /_ .. ....F, C
From Dwg. 21B131071 Rev. 2
PAGE 6 Pub. No. 18-BC39D6-4
SERVICE PANEL "-
ELFCTR1CAL AND RFFRIGERANT
COMPONENIS CLffARANOES
PER PREVAILING CODES.
403 [5 7/8)
330 {_3)
INSTALLER'S GUIDE
TWX018-060 OUTLINE DRAWING
_ NN T SHOUI D BE PLACED SO ROOF
RUNOFF WATER DOES NOT POUR
D]REC]I Y ON UNI], AN[} BHDU D BE
AT lEAST 305 {2"/ FROM //VAL AND All
SURROUNDING SBRDBBERY ON TWO B]©ES.
OTHER TWO S DES DNREBTR]CTED,
28.6 {I }/S) DIA. K.O. W[/
22.2 7/8/ D[A. IOIE /
ELECTRICAL POWER SUPPLY
22.2 17/8) DIA, IOIE
lOW VO TAGE
PRESSURE TAPS
/4" FLARE F TTINGS
229 9)
/
GAS L]NE BAL SERVICE
VALVE, BAL }/4 TURN
"D'_O.D. FEMA E BRAZED
CONNECT ON WT }/4"' AE
_LAR PRESSURE FAR 11 lING.
6O (2 3/8_
MODELS A B C D E
TWX018C 34-3/4 33-3/4 29-1/2 5/8 1/4
TWX024C 34-3/4 33-3/4 29-1/2 3/4 5/16
TWXO30D 38-7/8 33-3/4 29-1/2 3/4 5/16
TWXO36D 43-1/8 39-3/4 35-1/2 7/8 3/8
TWXO42D 43-1/8 39-3/4 35-1/2 7/8 3/8
TWXO48D 43-1/8 39-3/4 35-1/2 1-1/8 3/8
TWX060C 50-7/8 39-3/4 35-1/2 1-1/8 3/8
From Dwg. 21D147482 Rev. 7
Pub. No. 18-BC39D6-4 PAGE 7
INSTALLER'S GUIDE
CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the
following list:
1. Refrigerant Line, Leak checked .......................................................................................................... [ ]
2. Suction Lines and Fittings properly insulated ...................................................................................... [ ]
3. Have all Refrigerant Lines been secured and isolated properly? ........................................................ [ ]
4. Have passages through masonry been sealed? If mortar is used, prevent mortar from
coming into direct contact with copper tubing ..................................................................................... [ ]
5. Indoor coil drain line drains freely. Pour water into drain pan ............................................................. [ ]
6. Supply registers and return grilles open and unobstructed ................................................................. [ ]
7. Return air filter installed ...................................................................................................................... [ ]
8. Thermostat thermometer is accurate. Check against a reliable thermometer. Adjust
per instructions with thermostat .......................................................................................................... [ ]
9. Is correct speed tap being used? (Indoor blower motor) .................................................................... [ ]
SYSTEM OPERATIONAL CHECK
IMPORTANT: To prevent compressor damage which may result from the presence of LIQUID refrigerant in the
crankcase, these procedu res should be followed at initial Start-Up and at anytime the power has been off for 12 hours
or more.
1. Before proceeding with this "Operational Check," go to "Compressor Sump Heat Section" of this instruction to
determine the time compressor heat has been "ON," and make entry of the designated lines, in Step 2.
2. Start-Up Time A.M./P.M. Power Applied Time A.M./P.M.
Time Lapse Hours Minutes.
3. IfSteps 1 and 2 cannot be used, then place thermostat's system switch in the "OFF" position and apply power
by closing system disconnect switch. This energizes compressor heat and evaporates the liquid in the
crankcase. TO EVAPORATE LIQUID ALLOW AT LEAST ONE-HALF HOUR PER POUND (HCFC-22), AS
SHOWN ON UNIT NAMEPLATE.
OPERATING PRESSURES: After the unit has operated in the cooling mode for a short period of time, install
pressure gauges on the gauge ports of the discharge and suction line valves. Checkthe suction and discharge
pressures and compare them to the normal operating pressures provided in the unit's Service Facts.
NOTE: Use the pressures from Service Facts to determine the unit refrigerant charge.
To charge the system accurately, use superheat charging, or pressures
depending on flow control.
4. Except as required for safety while servicing: DO NOT OPEN SYSTEM DISCONNECT SWITCH.
SUPPLEMENTARY HEATERS CHECKOUT PROCEDURES, IF USED
DOES HEATER REQUIRE A SEPARATE CIRCUIT?
1. Be sure the fused disconnect switch is "OFF," and safety label (if any) is attached ................................ [ ]
2. Check on field wiring for sound connections and grounding according to codes .................................... [ ]
3. Check fuses for proper size per nameplate specifications ..................................................................... [ ]
4. Check control box panel -- in place and secured .................................................................................. [ ]
NOTE: OPERATION OF HEATERS MUST BE CHECKED DURING THE OPERATION CHECKOF THE TOTAL
SYSTEM. The Trane Company
6200 Troup Highway
Technical Literature- Printed in U.S.A. Tyler, TX 75707
PAGE 8 Pub. No. 18-BC39D6-4
PJ.
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