TRANE Air Conditioner/heat Pump(outside Unit) Manual L0802003

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

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It's Hard To Stop A Trane?

INSTALLER'S

GUI E

TWP-I N- 1C

18-BC28D 11-4

Library Service Literature

Product Section Unitary

Product Split System Heat Pump

Model TWP

Literature Type Installer's Guide

Sequence 1C

Date December I999

File No. SV-UN-S/SP-TWP-IN-IC I2/99

Supersedes TWP-IN-1B

Model:

TWP018,024,036,048C &TWP030,060D Heat Pumps

IMPORTANT -- This Document is customer property and is to remain with this unit. Please return to service infbrmation 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, except for the TWPO6OD,

may be used with indoor units equipped with Capillary

Tube, Thermostatic Expansion Valve or the Accutron TM

Flow Control Check Valve (F.C.C.V.) assembly for refrig-

erant flow control. The TWP06OD outdoor units are only

approved with indoor units equipped with thermostatic

expansion valve refrigerant controls.

Check for transportation damage after unit is uncrated. Report

promptly, to the carrier, any damage found 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 inc_ge of snow and ice (melted during d@x)st cycle)

prior to its refbeezin_. 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

drif_bs. If not possible, a snow drif_b 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

TOP DISCHARGE --- UNRESTRICTED

5FT. ABOVE UNIT

restriction of airflow to and fi'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

deli'ost 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

product improvement, it reserves the right to change

specifications and design without notice

I;TALLER'S G

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 Na-

tional Electrical Code. The unit must be far enough away from

any structure to prevent excess roofrun-offwater from pouring

directly on the unit.

3. The top discharge area must be unrestricted for at least five

(5) f_et above the 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 build-

ing structure.

5. The maximum length of refrigerant lines from outdoor to

indoor unit should NOT exceed sixty (60) f_et.

6. Maximum diffbrence in elevation should not exceed sixty

(60) feet.

NOTE: Consult Ref)'t:erantPtpuzgSoflware ,Pub.No. _2-3312-01.

7. Locate and install indoor coil or blower coil in accordance with

instruction included with that unit.

8. A pull-thru hole for the refrigerant lines should be provided

of sufficient size to allow the passage of both liquid and suction

lines.

9. Determine if adequate power supply is available and correct

according to nameplate specifications.

10. Install the unit in accordance with national, state, and local

codes.

C. ACCUTRON FLOW CONTROL VALVE

If the indoor unit System Refrigerant Flow control is an

Aecutron 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 u nit is factory shipped with a diffbrent 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 performance.

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 refrigerant line sets may be

straight or with a 90 degree bend, depending upon situation

BRAZE TYPE iNDOOR END

SEALING CAP

ACCUTRON_M

COMPONENTS

\ADAPTER

FLOW CONTROL

CHECK VALVE

(F.C.C.V.)ORtFICE

BODY

AS SHIPPED _

[_ FIELD SUPPLIED

_:--------LIQUID LINE

requirements. This should be thoroughly checked out befbre

ordering refrigerant line sets.

The gas line nmst 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 stone. Final refrigerant 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: Large diameter tubing will be very: di[ficult to rebend once

it has been shc:ped.

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 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 sufticient 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 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.

PAGE 2 Pub. No. 18-BC28D11-4

STALLER'S GUI

UNIT SiDE OF

SERVICE VALVE

HEX HEADED

VALVE SYSTEM_

LIQUID LINE SERVICE VALVE

LIQUID LINE

CONNECTION

RETAINING RING

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 a wall or sill, they

should be insulated and isolated.

d. Isolate the lines fl'om all ductwork.

E. SERVICE VALVE OPERATION

BRASS LIQUID AND GAS LINE SERVICE VALVE

OPERATION

The Service Valves are factory shipped in the seated position to

hold factory charge. The pressure tap service port (when de-

pressed) 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: Extremecautionshouldbeex-

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 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 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 full open with a 1/4 turn counter-

clockwise. See Figure 4.

BRAZING REFRIGERANT LINES

1. Boil)re brazing, remove plugs from external copper stub

tubes. (?lean 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 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. 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

CAM TI ON: Inscroncompressorapplications,

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

360 psi. Use soap bubbles or other leak-checking methods to see

that all field joints are leak-free! If not, release pressure; then

repair!

GAS LiNE SERVICE VALVE

CAP_._8 114 TURN ONLY

COUNTERCLOCKWISE

UNITSIDE

OF VALVE

_-- VALVE STEM

PRESSURE TAP PORT

GAS LINE CONNECTION

CAP_ &

CORE

Pub. No. 18-BC28D11-4 PAGE 3

I ;TALLER'S G

HEAT SHIELD

O o

SYSTEM EVACUATION

NOTE: Since the outdoor unit has a refi'igerant charge, the gas

and liquid line valves must remain closed.

1. Upon completion ofleak check, evacuate the refi'igerant lines

and indoor coil before opening the gas and liquid line valves.

2. Attach appropriate hoses from mani%ld gauge to gas and

liquid line pressure taps.

NOTE: Unnecessary switching of hoses cart be avoided and

complete evacuation of all lines leading to sealed system cart be

accomplished with mani[bld center hose and connecting branch

hose to a <ylinder of HCFC-22 and vacuum pump.

3. Attach center hose of mani%ld gauges to vacuum pump.

4. Evacu ate until the micron gauge reads no higher than 350 mi-

crons.

5. Close off valve to vacuum pump and observe the micron

gauge. Ifgau ge 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

manifbld gauge set and remove refrigerant charging hoses fi'om

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

PAGE 4

to ()pen gas line valve. An Adjustable or 314" Open End wrench

is required to take off the valve stem crop.

9. The liquid line shut-off valve can now be opened. Remove

shut-off' valve cap. Fully insert hex wrench into the stem and

baekou t counterclockwise until valve stem just touches retainer

ring (approximately five (5) turns) observing WARNING state-

ment. 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. Open the gas valve by

removing the shut-offvalve cap and turning the valve stem 1/4

turn counterclockwise, using 1/4" Open End orAdjustable wrench.

See Figure 4.

12. The gas valve is now open fbr refrigerant flow. Replace valve

stem cap to prevent leaks. See Figure 4.

If refrigerant lines are longer than 15 f>et and!or a different size

than recommended, it will be necessary to adjust system refrig-

erant charge upon completion of installation.

F. ELECTRICAL CONNECTIONS

WARN IN G: 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 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.

6. The use of color coded low voltage wire is recommended to

simplif_¢ 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.

Pub. No. 18-BC28D11-4

STALLER'S GUI

7. Table i defines maximum total length of low voltage wiring

from 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 han-

dler and the heaters.

H. START KIT

All single phase units, except TWP060D, have quick start com-

ponents which are factory installed.

I. OUTDOOR THERMOSTAT

An outdoor thermostat TAYSTAT250A may be field installed.

For data see wiring diagrmn attached to unit and instruction

sheet packaged with outdoor thermostat.

J. 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 used to measure the

coil temperature. The difference between the ambient and the

colder coil temperature is the ditI_rence or delta-T measure-

merit. 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

defi'ost. The coil sensor also serves to sense outdoor coil tempera-

ture for termination of the defi'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 defl'ost 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 for 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.)

®PiN IDENTIFICATION

I.-

a t

2. TST = Test (Shorting TEST_COMMON to this pin speeds

up all defi'ost board timings.)

3. FRC_DFT = Forced Defi'ost (ShortTEST COMMON to this

pin for two (2) seconds to initiate a forced defl'ost. Remove the

short affuer defi'ost initiates.)

DEFROSTCONTROLCHECKOUT

Normal operation requires:

a. LED on board flashing I 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

TESTCOMMON pin.

If a defl'ost control problem is suspected, ref>r to the service

information in control box.

WARNING: DoNOTconnect24VACtoT1

(ODS-A) terminal. ODS-A thermistor WILL BE BLOWN.

K. OPERATIONAL AND CHECKOUT PROCEDURES

Final phases of this installation are the unit Operational and

Checkout Procedures which are found on page 8 of this instruc-

tion.

L. 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 nameplate). Following this procedure

will prevent compressor damage at the initial startup.

Record the "POWER APPLIED DATA" on the designated lines

below:

Time A.M./P.M. Date

By Electrician

(SEE WIRING DIAGRAMS )

Pub, No, 18-BC28D11-4 PAGE 5

I ;TALLER'S G

A TYPICAL FIELD WiRiNG DIAGRAM FOR SPLIT SYSTEM HEAT PUMPS

TWP018=060 WITH AiR HANDLERS

A TYPICAL FIELD WIRING DIAGRAM FOR TWP018-060 HEAT PUMPS

WITH VARIABLE SPEED AIR HANDLERS AND SUPPLEMENTARY HEATERS

NOTES:

1. POWER W_RING AND GROUNDING OF EQUIPMENT MUST COMPLY WITH

LOCAL CODES.

2. BE SURE POWER SUPPLY AGREES WITH EQUIPMENT NAMEPLATE

3. LOW VOLTAGE WIRING TO BE NO 18 AW.G. MINIMUM CONDUCTOR

4. USE COPPER CONDUCTORS ONLY.

5. POLARIZED PLUG SECTION PM-A iS ATTACHED TO HEATER CONTROL

BOX. SECTION 1-PF IS FACTORY WIRED INTO AIR HANDLER.

6. TERMINAL W2 WILL HAVE INTERNAL

CONNECTIONS ONLY IF SECOND

CONTACTOR IS USED BY THE HEATER

CONTROLLING POWER TO ELECTRIC

HEATING ELEMENTS IF SECOND (BH) H # _,

CONTACTOR IS USED, THEN FIELD 0, J) JC I (N

CONNECTIONS TO W2 CAN BE SNLE ''E

OMITTED AS APPROPRIATE

7. IF ODT iS NOT USED. THEN CONNECT

APPROPRIATE JUMPER FROM W1 TO

W2 ON LVTB

8. IF HUMIDISTAT IS NOT USED,

CONNECT JUMPER FROM "R" TO "BK"

FOR FULL TONNAGE AIRFLOW IN

COOLING

9. CONNECT IN THIS MANNER IF OD

UNiT HAS "F" CONNECTION

10. CONNECT W3 TO W2 ONLY IF USING

HEATER WITH 3 HEATER STAGES

s,O0 bl i I!bl0_ A

BA?28}', 38

/F iU'i C0[}S

Pr4 s_ ............

'pi If ,i }

_/' 8E [OT8

IOTE O

NOlES 6&Z

,_;[;-IA }[ R

IIUMI) _TAi

N0][ 8

=C: ....... ] _g> W;li N0

....................................4 '/ _ '_Y[;

] ',':;" WI, N0 From Dwg. 21B800255 Rev. 2

PAGE 6 Pub. No. 18-BC28D11-4

STALLER'S GUI

TWP018=060 OUTLINE DRAWING

_EFV CE A El }-_

E D _]CAL AND RE R_GE AX

COMRONE S C ARANCE%

PEr PFiEVA ]NO COD,

I (2} m

ii ii

!! !!

II II

ii ii

II II

ii ii

II II

JJ JJ

II II

JJ JJ

II II

ii ii

II II

NOTE: ALL DIMENSIONS IN MM (INCHES).

_-<: /O: O_SCI_ARG AF_EA S40UI D

LNR S[IRK}IED IOR AI [A}I VE (B)

Pl AD ) SO RDO RUN Oi F 7FA E:/

DOES NOT POJR D RECTI Y ON dN ,

AN[} SI(}(" B A EAS' 0% ( _'_

ROM WA[ AND A S(R 0[ O NB

5ilRUBBERY ON TWO SIDES, OT LR

I W 0 S )E S U E S R '_C I E D.

\_ _ GAS L [bE SER,/[CE Y/4 VE

"D"() J), F _SA : E% AZ l)

CONNECTION 'H]TB /4" S/\E F[ ARE

\\\\\\ t: J, I ] N G

" i Q;J]D ]NE S RV](E VA VE,

[:'_O,D, FEMA E BRAZED

(ONNEC ION W II I/4" SA : A i

PR-SSURE _AP Y'NG,

FG, 1

229 (9)

12)' (:N

4 8

FI@_ 2

GAS LINE BALL SERVICE VALVE,

BALL 1/4 TURN "D" O.D. FEMALE

BRAZED CONNECTION WITH 1/4"

SAE FLARE PRESSURE TAP FITTING

]QUID [NE SERV CE VA VE,

_ O,D, EMA E BRAZED

ONNE', ] '01 A'] H /4 _ SAE

i ARE NRESSJR lAP TT]NC

MODELS FIG. A B CD E

TWP0 ! 8C 1 24-3/8 28-1/4 24-5/8 5/8 1/4

TWP024C 2 28-5/8 32-7/8 28-3/4 3/4 5/18

TWP030D 2 32-3/4 32-7/8 28-3/4 3/4 5/18

TWP036C 2 37 38-7/8 34-3/4 7/8 3/8

TWP042C 2 37 38-7/8 34-3/4 7/8 3/8

TWP048C 2 37 38-7/8 34-3/4 1-1/8 3/8

TWP060D 2 37 38-7/8 34-3/4 1-1/8 3/8

NOTE: TABLE IN INCHES ONLY.

Pub, No, 18-BC28D11-4

From Dwg. 21D147562 Rev. 6

PAGE 7

I ;TALLER'S G

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 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 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.

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

Technical Literature- Printed in U.S.A. Tyler, TX 75707

PAGE 8 Pub. No. 18-BC28D11-4

P.I.

TRANE Air Conditioner/heat Pump(outside Unit) Manual L0802003

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