TRANE Air Conditioner/heat Pump(outside Unit) Manual L0802029
User Manual: TRANE TRANE Air conditioner/heat pump(outside unit) Manual TRANE Air conditioner/heat pump(outside unit) Owner's Manual, TRANE Air conditioner/heat pump(outside unit) installation guides
Open the PDF directly: View PDF 
.
Page Count: 8
It's Hard To Stop A Trane7
INSTALLER'S
GUI E
TWR-IN-3E
18-BC29D8-6
Library Service Literature
Product Section Unitary
Product Split System Heat Pump
Model TWR
Literature Type Installer's Guide
Sequence 3E
Date March 2000
File No. SV-UN-S/SP-TWR-IN-3E 3/00
Supersedes TWR-IN-3D
Model:TWR012,018,024,030,042C
&TWR036,048,060D 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 fbr
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 fbr transportation damage al_er unit is uncrated. Report
promptly, to the carrier, any damage found to the unit.
To determine the electrical power requirements of the unit, refhr
to the nameplate of the unit. The electrical power available nmst
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 drainaqe of snow and ice (melted during de[_'ost cycle)
prior to its re[keezing. 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 accmnulate snow
drif_bs. If not possible, a snow drilt 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 l?om the unit to prevent
restriction of airflow to and from the unit. Also allow fbr proper
maintenance space. The barrier should be constructed of
materials which will blend in with the building design.
TOP DISCHARGE --- UNRESTRICTED
5FT. ABOVE UNIT
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 fog 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 manufacturer has a policy of continuous
© American Standard Inc. 2000 product improvement, it reserves the right to change
specifications and design without notice.
I STALLER'S GUIDE
B. LOCATION & PREPARATION OF THE UNIT
1. The u nit 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 minimun_ of 12" fi'om
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
fi'om any structure to prevent excess roof run-off water from
pouring directly on the unit.
3. The top discharge area must be unrestricted fbr at least five
(5) feet above unit.
4. 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
building structure.
5. The maximum length of refi'igerant lines fi'om outdoor to
indoor unit should NOT exceed sixty (60) feet.
6. Maximum difference in elevation should not exceed sixty
(60) f_et.
NOTE: Refi_r to '_efHgerant Pipir_ Sk_flu:are': Pub. No. 22-3312-01.
7. Locate and install indoor coil or blower coil in accordance
with instruction included with that unit.
8. A pull-thru hole for the ref>igerant lines should be provided
of sufficient size to allow the passage of both liquid and suction
lines.
9. Determine if adequate power supplyis available and correct
according to nmneplate specifications.
10. Install the unit in accordance with national, state, and
local codes.
C. ACCUTRON TM FLOW CONTROL VALVE
If the indoor unit System Refi'igerant Flow control is an
Accutron TM orifice and check valve assembly, an orifice size
change may 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 factory 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 perfbr-
tnance.
D. INSTALLING REFRIGERANT LINES
Pressure taps are provided on the service valve plate and on
service valve of outdoor unit for compressor suction and liquid
pressures.
The indoor end of recommended refiqgerant line sets may be
straight or with a 90 ° bend, depending upon situation require-
BRAZE TYPE iNDOOR END
SEALING CAP
ACCUTRONTM )
COMPONENTS
/
BODY
\FLOW CONTROL
CHECK VALVE
(F.C.C.V.)ORIFICE
AS SHIPPED _
[_ FIELD SUPPLIED
LIQUID LINE
ments. This should be thoroughly checked out befbre ordering
refrigerant line sets.
The gas line must always be insulated.
The units are factory charged with the system charge required
when using fil_een (15) feet of connecting line. Unit nameplate
charge is the same. Final ref1"igerant charge adjustment is
necessary, use the Charge Charts in the outdoor unit Service
Facts.
1. Determine the most practical way to run the lines.
2. Consider types of bends to be made and space limitations.
NOTE: Laqge diameter tubing will be very difficult to rebend
once it has been shaped.
3. Determine the best starting point fbr rou ting 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 clear. The location of this hole (if
practical) should be just about the wall plate which is resting on
the fbundation.
5. Be sure the tubing is of sufficient length.
6. Uncoil the tubing -- do not kink or dent.
7. Route the tubing maMng all required bends and properly
secure the tubing before making connections.
8. To prevent a noise within the building structure due to
vibration transmission fi'om the refi'igerant lines, the following
precautions should be taken:
a. When the refiigerant lines have to be fastened to floor
joists or other fi'amingin a structure, use isolation type hangers.
b. Isolation hangers should also be used when refi'igerant
lines are run in stud spaces or enclosed ceilings.
PAGE 2 Pub. No. 18-BC29D8-6
INSTALLER'S GUIDE
®LiQUiD LiNE SERVICE VALVE
UNIT SIDE OF
SERVICE
HEXHEADED
LIQUID LINE
CONNECTION
GAS LiNE SERVICE VALVE
RETAINING RING
UNIT SIDE OF
SERVICE VALVE LIQUID LINE
CONNECTION
c. Where the refrigerant lines run through a wall 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 factory 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).
AWARNING: Extremecautionshouldbe
exercised 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 ring is
missing, do not attempt to open the valve. See Figure 3.
BRASS GAS LINE BALL SERVICE VALVE
The Brass Gas Line Ball Service Valve is shipped in the closed
position to hold the factory refi'igerant 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 hdl open with a 1/4 turn counter-
clockwise. See Figure 4.
BRAZING REFRIGERANT LINES
1. Before brazing, remove plugs h'om 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 fl'om clear plastic bag. Soak pad in
water and place over suction and liquid lines to protect unit
finish. See Figure 5. Discard pad when finished with brazing.
7. Use a Dry Nitrogen Purge and Brazing Alloy without flux
when brazing the field line to the copper factory connection.
GAS LINE SERVICE VALVE
CAP -_.___ _114 TURN ONLY
COUNTERCLOCKWISE
UNIT SIDE
OF VALVE
/J
PRESSURE TAP PORT _"
/
GAS LINE CONNECTION
CAP _{_
il
CORE
Pub. No. 18-BC29D8-6 PAGE 3
I STALLER'S GUIDE
HEAT SHIELD
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
it, 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 nmst
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-flee! If not, release
pressure; then repair!
SYSTEM EVACUATION
NOTE: Since the outdoor unit has a refi'igerant charge, the gas
and liquid line values must remain closed.
1. Upon completion of leak check, evacuate the refl'igerant
lines and indoor coil before opening the gas and liquid line
valves.
2. Attach appropriate hoses fl'om manifold gauge to gas and
liquid line pressure taps.
NOTE: Unnecessary switching of hoses can be avoided and
complete evacuation of'all lines leading to sealed system can be
accomplished with manifidd center hose and connecting branch
hose to a cylinder of HCFC-22 and uacuum pump.
3. Attach center hose of manifold 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
mani%ld 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 toopen gas line vaIve. An Adjustable or 3 / 4" Open End
wrench is required to take off the valve stem cclp.
9. The liquid line shut-offvalve can now be opened. Remove
shut-offvalve cap. Fully insert hex wrench into the stem and
backout counterclockwise until valve stem just touches re-
tainer ring (approximately five (5) turns) observing WARNING
statement. See Figure 3.
10. Replace liquid service pressure tap port cap and valve stem
cap. These caps MUST BE REPLACED to prevent leaks.
Replace valve stem 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-offvalve cap and turning
the valve stem 1/4 turn counterclockwise. See Figure 4. For
brass gas line service valve opening, follow items 9 & 10 above.
12. The gas valve is now open for refrigerant flow. Replace valve
stem cap to prevent leaks. See Figure 4.
If may be necessary to adjust system refi'igerant charge upon
completion of installation. System should be operated and
checked for proper charge.
F. ELECTRICAL CONNECTIONS
WARN ING: Wheninstalling 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 nmst 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 4Pub. No. 18-BC29D8-6
INSTALLER'S GUIDE
6. The use of color coded low voltage wire is recommended to
simplify 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
fl'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. OUTDOOR THERMOSTAT
An outdoor thermostat TAYSTAT250A may be field installed.
For data see wiring diagrams attached to unit and instruction
sheet packaged with outdoor thermostat.
I. DEFROSTCONTROL
The demand defl'ost control measures heat pump outdoor am-
bient temperature with a sensor located outside the outdoor
coil. A second sensor located on the outdoor coil is used to
measure the coil temperature. The difference between the
ambient and the colder coil temperature is the difference or
delta-T measurement. This delta-T measurement is represen-
tative of the operating 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 temperature for termination of the defl'ost
cycle.
FAULT DETECTION
A fault condition is indicated by the flashing light on the defl'ost
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, refer to the service manual fbr that unit.
PIN IDENTIFICATION (See Figure 6)
1. TEST_COMMON (Shorting any of the other pins to this pin
causes the function of the other pin to be executed. Leaving this
pin open results in the normal mode of operation.)
2. TST = Test (ShortingTEST_COMMON to this pin speeds
up all defl'ost board timings.)
3. FRC_DFT = Forced Defl'ost (Short TEST_COMMON to
this pin fbr two (2) seconds to initiate a forced defrost. Remove
the short after defl'ost initiates.)
PiN IDENTIFICATION
Z
0
o
c)
h-
¢0
m_
DEFROSTCONTROLCHECKOUT
Normal operation requires:
a. LED on board flashing 1 time/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
TEST_COMMON pin.
If a defrost control problem is suspected, refhr to the service
information in control box.
WARN IN G: DoNOTconnect24VACtoT1
(ODS-A) terminal. ODS-A thermistor WILL BE BLOWN.
J. OPERATIONAL ANDCHECKOUTPROCEDURES
Final phases of this installation are the unit Operational and
Checkout Procedures which are found on page 8 of this instruction.
K. COMPRESSOR SUMP HEAT
After all electrical wiring is complete, SET THE THERMO-
STAT 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 Electrician
(SEE WIRING DIAGRAMS )
Pub, No, 18-BC29D8-6 PAGE 5
I STALLER'S GUIDE
NOTES:
ATYPICAL FIELD WIRING DIAGRAM FOR SPLIT SYSTEM HEAT PUMPS
TWR012-060 WiTH AIR HANDLERS TOPOWERSUPPLYPER
LOCAL CODES &AS DEFINED
IN FIELD WIRING TABLE
FOR S PH FromDwg. 21B131071,Rev. 2
ATYPICAL FIELD WiRiNG DIAGRAM FOR SPLIT SYSTEM HEAT PUMPS
TWR012=060 WiTH TAYPLUS103A CONTROL iN FURNACE (RESTRICTED MODE)
ROOM THERMOSTAT NOTES:
NTER-COMPONEN! WERNG
24 V, ] FACTORY
....... LINE V:_ WIRING
24V. _ _]ELD
LINE V>_ WIRING
FIELD INSTALLED
FACTORY WRING
HEATPUMP
O,D, SEO_ON
_bE __:::,\T
L__> I
L
TAYPLUSIO3AI___-
NOTE 4 ]
_R = _ME DELAY RELAY
MODEL RLY1BB4
K= RELAY
MODEL RLY1663
TDR
I. POWER SUPPLY AND GROUNDING OF
EQUIPMENT MUST COMPLY WITHLOOAL
COOLS,
2. BE SURE POWER SUPPLY AGREES WI]H
EOUIPMENINAMEPLATE
3, lOW VOLTAGE [24 V_A,C,! MUST BE
NO, 18 AWB MIN,
4. THIS LEAO REQUIRED ONLY IF FURNACE
NEEDS "Y"TO OELWER FULL COOLING
AIRFLOW.
5. MAKE TH!S JUMPER CONNECTION ONLY IF
THE FURNACE NEEDS FAN ENABLE SIGNAL
FOR HEATING OPERATION.
6. THIS JUMPER REQUIRED ONLY FOR 2
STAGE FURNACES,
7. BONNET THERMOSTAT MODEL TRTI248
REQUIRED FOR OIL FURNACE
APPLICATIONS,
8. ]D LOOK OUr GAS _URNACE A] OUTDOOR
]EMPERATURES ABOVE 00] SEE POINT, DO NO]
CONNEC[ WJRE [O [HERMOSfA1 IERMINAL '_"
AND TERMINAL "I" ON DO[.
LEGEND
ODT= OUTDOOR THERMOSTAT
MODEL TAYSTATBBOA
BT = BONNET THERMOSTAT
MODEL THT1248
TO.O.E.SUPPLY PER
LOCAL CODES
From Dwg. 21C149455, Rev. 2
PAGE 6 Pub, No, 18-BC29D8-6
INSTALLER'S GUIDE
TWR012=060 OUTLINE DRAWING
SERVICE PANEL
ELECTRICAL AND REFRIGERANT
COMPONENTS CLEARANCES
PER PREVAILING CODES.
28.G [I I/8] D]A. K.O. WITH
22.2 (7/8} D]A. HOLE
ELECTRIC POWER
22.2 (7/8] D[A.
HOLE LOW
PRESSURE TAPS
I/4" FLARE F[TT[N 210
(4 3 ]
NOTE:ALL DIMENSIONS ARE
iN MM (INCHES).
_TOP DISCHARGE AREA SHOULD BE
UNRESTRICTED FOR AT LEAST FIVE (5}
FEET ABOVE UNIT. UNIT SHOULD BE
PLACED SO ROOF RUN OFF WATER
DOES NOT POUR DIRECTLY ON UNIT,
AND SHOULD BE AT LEAST 305 (12"]
FROM WALL AND ALL SURROUNDING
SHRUBBERY ON TWO SIDES. OTHER
TWO SIDES UNRESTRICTED.
GAB LINE SERVICE VALVE,
"D'O.D. FEMALE BRAZED
CONNECTION WITH I/4"SAE FLARE
PRESSURE TAP FITTING.
LIQUID LINE SERVICE VALVE,
"E"O.D. FEMALE BRAZED
CONNECTION WITH I/4" SAE FLARE
PRESSURE TAP FITTING.
FIG. 1
PRESSURE TAPS
I/4" FLARE
FITTING
228 (81
41 11_ ]_
FIG. 2
GAS LINE BALL SERVICE VALVE,
_BALL 1/4 TURN "D" O.D. FEMALE
BRAZED CONNECTION WITH 1/4"
SAE FLARE PRESSURE TAP FITTING
"-LIQUID LINE SERVICE VALVE,
"E" O.D. FEMALE BRAZED
CONNECTION WITH IZ4" SAE
FLARE PRESSURE TAP FITTING.
MODELS FIG. ABCD E
TVVR012C 1 24-3/4 23-5/8 20 5/8 1/4
TVVR018C 1 24-3/4 23-5/8 20 5/8 1/4
TVVR024C 1 24-3/4 28-!/4 24-5/8 3/4 5/18
TVVR030C 1 32-3/4 28-!/4 24-5/8 3/4 5/18
TVVR036D 1 32-3/4 28-!/4 24-5/8 7/8 3/8
TVVR042C 2 37 32-7/8 28 3/4 7/8 3/8
TVVR048D 2 32-3/4 32-7/8 28 3/4 !-!/8 3/8
TVVR060D 2 37 38-7/8 34-3/4 !-!/8 3/8
From Dwg. 2ID147562, Rev. 6
Pub. No. 18-BC29D8-6 PAGE 7
I STALLER'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 procedures should be followed at initial Start-Up and at anytime the power has been offfor 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 dthe 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. If Steps 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. Check the 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.
Technical Literature -Printed in U.S.A.
PAGE 8
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 CHECK OF THE TOTAL
SYSTEM. The Trane Company
6200 Troup Highway
Tyler, TX 75707
Pub. No. 18-BC29D8-6
P.I.
