TRANE Air Conditioner/heat Pump(outside Unit) Manual L0802054
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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18-BC39D6-4 TIUIHE Library Product Section Product It's Hard To Stop A Trane? Model Literature Type INSTALLER'S GUID Sequence Date File No. Supersedes Model: TWX018-0240, TWX030-048D IMPORTANT -- This Document upon completion of work. is customer property Heat Pumps & TWX060C and is to remain 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 installation 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. with this unit. Please return to service information pack © A. GENERAL NOTICE: These outdoor units 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 refrigerant flow control. Check for transportation promptly, to the carrier, damage alter unit is uncrated. any damage fbund to the unit. Report 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 manufactured 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 precautions be taken for units being installed in areas where snow accumulation and prolonged below freezing temperatures 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 incl ge 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 © American Standard Inc. 2000 maintenance space. The barrier should be constructed rials which will blend in with the building design. of mate- 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 product and product data improvement, it reserves the right to change design and specifications without notice. INSTALLER'S GUIDE B. LOCATION & PREPARATION OF THE UNIT 1. The unit should be set on a level support as the unit base pan. pad at least as large (_ BRAZE TYPE INDOOR END SEALING 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. CAP COMPONENTS ACCUTRONTU _' FLOW CONTROL CHECK VALVE (F.C.C.V.) ORIFICE 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 building structure. 6. The maximum indoor unit should 7. Maximum (60) feet. NOTE: length of refrigerant lines li'om outdoor NOT exceed sixty (60) feet. diffbrence in elevation should not exceed sixty 10. Determine if adequate power supply is available according to nameplate specifications. 11. Install codes. the unit in accordance C. ACCUTRON Refer to '_e[i_gerant Pipir_ Software'; Pub. No. 32-3312-01. 8. Locate and install indoor coil or blower coil in accordance instruction included with that unit. 9. A pull-thru hole for the refrigerant of sufficient size to allow the passage lines. @ to LIQUID LINE FIELD SUPPLIED UNIT lines should of both liquid LEG & ISOLATOR NIT \ UNIT LEG _ with be provided and suction LOCATION ISOLATORS (2 PER LEG) TM FLOW with national, CONTROL and correct state, and local VALVE If the indoor unit System Refrigerant Flow Accutron TM orifice and check valve assembly, change ,nay be necessary. control is an an orifice size 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 service valve of outdoor unit Ibr compressor pressures. valve plate and on suction and liquid 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. PAD LOOSEN TWO SCREWS AND SLIDE SLOT OF LEG UNDER HEAD OF SCREWS AND TIGHTEN 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. 1. Determine TYPICAL 2. Consider PAGE 2 the most practical way to run the lines. 4 CORNERS types of bends to be made and space limitations. Pub. No. 18-BC39D6-4 INSTALLER'S GUIDE G LIQUID LINE SERVICE 8. To prevent a noise within the building structure due to vibration transmission from the refrigerant lines, the following precautions should be taken: VALVE <,. a. When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type hangers. UNIT SIDE OF SERVICE VALVE LIQUIDLINE HEX HEADED CONNECTION b. Isolation hangers should also be used when lines are run in stud spaces or enclosed ceilings. refrigerant c. Where the refrigerant lines run through should be insulated and isolated. or sill, they d. Isolate E. SERVICE BRASS RETAINING NOTE: Large diameter it has been shaped, 3. Determine tubing-INSIDE RING tubin_ will be very di[f_cult to rebend once point for routing the refrigerant 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. 6. Uncoil the tubing is of sufficient LIQUID --- do not kink or dent. and LINE SERVICE _ ,[--'J, 1/4 TURN _-_//_- POSITION VALVE UNIT SiDE OF VALVE GAS LINE properly ¢ GAS BALL SERVICE STEM REFRIGERANT be ex- should VALVE / / LiNE CONNECTION LINES 1. Before brazing, remove plugs tubes. Clean internal and external to brazing. 3. Insulate PORT caution 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. 2. Cut and fit tubing TAP Extreme ONLY COUNTERCLOCKWISE FOR FULL OPEN _ OPERATION 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. BRAZING CAP VALVE The Gas Line Service Valve is lull open with a 1/4 turn counterclockwise. See Figure 5. GAS LINE SERVICE VALVE PRESSURE OPERATION length. 7. Route the tubing making all required bends secure the tubing before making connections. @ VALVE 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). BRASS 5. Be sure the tubing the lines from all ductwork. WARNING: the best starting OR OUTSIDE awall the entire minimizing from external copper surfaces of stub tubes the use of sharp stub prior 90 ° bends. gas line and its fittings. 4. Do NOT allow uninsulated contact with bare gas line. liquid line to come in direct 5. Precautions should be taken to avoid heat damage to the pressure tap valve core during brazing. It is recommended that the pressure tap port valve core be removed and a wet rag wrapped around the valve body. CAP _ NOTICE: pressure Use care to make sure that no moisture tap port, while wet rag is being used. enters 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 3. Attach (_ center 4. Evacuate 350 microns. HEAT_ hose of manifbld until the micron gauges gauge to vacuum reads pump. no higher than 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 minute, the evacuation should be complete. in one (1) 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 ATMOSPHERE. VENT REFRIGERANT INTO THE 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. 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 LEAK using accepted good brazing techniques. CHECK CAUTION: tions, dome compressor, temperatures may cause In scroll compressor applicamay be hot. Do not touch top of minor to severe burning. 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 statement. 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 open the the valve gas line gas valve can now be opened. For a ball type gas valve, valve by removing the shut-off valve cap and turning stem 1/4 turn counterclockwise. See Figure 5. For brass service valve opening, fbllow items 9 & 10 above. be- 12. The gas valve is now open for refrigerant flow. Replace stem cap to prevent leaks. See Figures 4 & 5. valve 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! If may be necessary to adjust system refrigerant charge completion of installation. System should be operated checked for proper charge. upon and IMPORTANT: fore attaching SYSTEM Replace pressure tap port valve hoses for evacuation. core EVACUATION NOTE: Since the outdoor unit has a re[}'igerant and liquid line valves must remain closed. chasge, the gas 1. Upon completion ofleak check, evacuate the refrigerant lines and indoor coil before opening the gas and liquid line valves. 2. Attach appropriate hoses liquid line pressure taps. li'om manilbld gauge to gas and 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. PAGE 4 F. ELECTRICAL CONNECTIONS A WARNING: When this tions exercise basic safety of electric shock. equipment, to avoid ALWAYS the possibility 1. Power wiring local codes. and grounding 2. Power supply must 3. Install a separate 4. Ground the outdoor installing of equipment agree with equipment disconnect switch or servicing precau- must comply with nameplate. at the outdoor unit. unit per local code requirements. 5. Provide flexible electrical conduit whenever vibration mission may create a noise problem within the structure. trans- 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 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.) 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. © PIN IDENTIFICATION Z O O o I *If 22 AWG is used, make sure it is high quality I-, (D wire. 7. Table I defines maximum total length of low voltage fi'om outdoor unit, to indoor unit, and to thermostat. wiring 8. Mount the indoor thermostat in accordance with instruction included with the thermostat. Wire per appropriate hook-up diagram (included in these instructions). DEFROST G. ELECTRICAL a. LED on b. 24V AC c. 24V AC d. Defrost TESTCOMMON Electric heaters, device according" and the heaters. HEATERS if used, are to be installed in the air handling to the instructions accompanying the air handler H. DEFROSTCONTROL The demand defrost control measures heat pump outdoor ambient 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 measurement. This delta-T measurement is representative 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 lbr termination of the defi'ost cycle. CONTROLCHECKOUT Normal operation requires: board flashing 1 thne/second. between R & B between Y & B with unit operating initiation when FRC_DFT pin pin. lfa defi'ost control problem is suspected, tion in control box. terminal. I. OPERATIONAL connect 24VACto ODS-A thermistor WILL BE BLOWN. AND CHECKOUTPROCEDURES Final phases of this installation Checkout Procedures which instruction. J. COMPRESSOR FAULT to refer to the service informa- WARNING: .o T1 (ODS-A) is shorted SUMP are the unit Operational and are fbund on page 8 of this HEAT DETECTION A fault condition is indicated by the flashing control inside the heat pump control box. light on the defrost 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 defrost board thnings.) tothispinspeedsupall 3. FRC DFT = Forced Defrost (ShortTESTCOMMONto thispin for two (2) seconds to i_litiate a forced defrost. Remove the short 'after defrost initiates.) Pub. No. 18-BC39D6-4 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 below: APPLIED Time A.M./P.M. DATA" on the designated lines Date By Electrician (SEE WIRING DIAGRAMS) PAGE 5 INSTALLER'S GUIDE A TYPICAL FIELD WIRING DIAGRAM FOR SPLIT SYSTEM TWXO18-O60 WITH AIR HANDLERS HEAT PUMPS I0 PO¢_E 5(PPY PER LOCAL CO S N0[ESr ; POWER _iR]_5 MUSI COMPY AN0 6R0tI_/O]N5 OF EQUIPMENT 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 M ]_ iMtiM _0_0UC] 0R 4 USE C(}_PFI_ OONi)UCTORS 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 TO BE NO _,0 _/! I'WO !, i8 AWG 0NtY 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 JUMPER F_0M _i TO W2 ON kYTB APPROPN]AIE S CONNFC_ I_ THiS _ANNER iF 0D 10 10_/_EC T W3 10 W_ 0_t Y IF bS1_0 3 HEA_ER S[AOES AIR i AN LEF/ ODI LJ_iT HAS "_" i4FA_EI:i NOTIS (_ & 7 ii ...... ]r I_UMI0iSTAT [5 NOT USFD, CONNrCT JUMPER _ROM "R" T0 '_K" _0R _Ui I 10N_AOE AIRNi 0W I_ C00_ iNS _iTli tUM D[5 NOTE 8 _L AT Lr, E I/ _ WILING :J ................. V, _E "_ FEb ""'* /qR I( From Dwg. 21B800255 Rev. 2 A TYPICAL FIELD WIRING DIAGRAM FOR SPLIT SYSTEM HEAT PUMPS TWXO18-O60 WITH VARIABLE SPEED AIR HANDLERS TO POWER SLJPPL Y PER OCAL COD S&iG D P]_4ED ]N SE 9 WIN]NO TABLE OES: I 2 3 POWER #lRh6 ACiD GROUkDINO _US[ _1_1LOC,% COMPLY BE SUN _ POWER 5UPPi Y AORLE5 _ITH { OW VOLTAOE i8 A_O MiNimUM _[RiN6 TO BE !/0 iJSi_ COP;%R O0;qOdCiONS b POLARiZ_[} TO liEAI_R F AC[OI/v IF 001 JUMPER5 7 ROOM TiERMOS A OONCUCTOR 4 0 OF EOJ PME_4T ¢O_ES PLU6 5ECi _O_i_OL WIRE[} iS _()[ FRO_ BOX, i_T(} O_tv iON PM A IS Ai _ACliED S_O[[Ok USED, 114EN CO_E_ Hi W2 AND W3 ON L?T B i0 Ti_NMINAI 5 _2 AN8 _3 Wil I ilAVii CO_EC;iON50_Y I PF IS AiR i4A_Oi LR iF 2NL)_ [ APPRO_RI/'TE IN ILRkAL ]RDCO_IAC;ORS ARE USEO BY ]lie H_A[EP, FOR COntROl POWLI! TO ELECTRIC _!FAI U/O _EN]5 [ tN8 JF¸ 2NO & 3R_ (Bli & Cli) CON IAC iONS ARE NOT US_O_ Tilden FIEi {) CONN!IC _]0_0 O_ [_'TE O AS APPROPR IA_L. O T 0 W2 £Ni) _3 O£N BE CO_N_[C[ ¸ iN THIS MAN_/OR iF¸ 0[} "F" CONNECTION (i_IT liAS INTER O0!?PONENT 24 V 4 /. ....... ;]_1 FOR 3 Pl PAGE 6 W[Rt3 _ X t,o FACTORY ','_ WRIO ', /_ :ILl} .. ....F, C From Dwg. 21B131071 Rev. 2 Pub. No. 18-BC39D6-4 INSTALLER'S GUIDE TWX018-060 SERVICE PANEL OUTLINE DRAWING "- ELFCTR1CAL AND RFFRIGERANT COMPONENIS CLffARANOES PER PREVAILING CODES. _ 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, 330 {_3) 403 [5 7/8) 28.6 {I }/S) DIA. 22.2 7/8/ ELECTRICAL D[A. 22.2 17/8) lOW VO PRESSURE /4" K.O. IOIE POWER DIA, W[/ / / SUPPLY IOIE TAGE TAPS FLARE F TTINGS 229 9) GAS L]NE BAL SERVICE VALVE, BAL }/4 TURN "D'_O.D. FEMA E BRAZED CONNECT ON WT }/4"' _LAR PRESSURE FAR 6O MODELS A B TWX018C 34-3/4 33-3/4 TWX024C 34-3/4 TWXO30D (2 AE 11 lING. 3/8_ C D E 29-1/2 5/8 1/4 33-3/4 29-1/2 3/4 5/16 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 Pub. No. 18-BC39D6-4 Rev. 7 PAGE 7 INSTALLER'S GUIDE CHECKOUT After installation following list: has been completed, 1. Refrigerant it is recommended that the entire system be checked against the [ ] [ ] [ ] 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. [ ] [ ] [ ] 8. Thermostat thermometer is accurate. Check against a reliable thermometer. Adjust per instructions with thermostat .......................................................................................................... [ ] 9. Is correct [ ] 2. Suction Line, Leak checked PROCEDURE Lines and Fittings properly 3. Have all Refrigerant 6. Supply .......................................................................................................... registers insulated Lines been secured ...................................................................................... and isolated properly? Pour water into drain pan ............................................................. and return grilles open and unobstructed 7. Return air filter installed ........................................................ ................................................................. ...................................................................................................................... speed tap being used? (Indoor blower SYSTEM motor) .................................................................... 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. Time Lapse Power Applied Time Hours A.M./P.M. 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. 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: SUPPLEMENTARY HEATERS CHECKOUT DOES HEATER 1. Be sure the fused disconnect DO NOT OPEN SYSTEM REQUIRE and grounding 3. Check fuses for proper size per nameplate specifications 4. Check control box panel -OPERATION Technical Literature- Printed in U.S.A. PAGE 8 IF USED CIRCUIT? according to codes .................................... ..................................................................... in place and secured .................................................................................. OF HEATERS SYSTEM. PROCEDURES, A SEPARATE SWITCH. switch is "OFF," and safety label (if any) is attached ................................ 2. Check on field wiring for sound connections NOTE: DISCONNECT MUST BE CHECKED DURING THE OPERATION CHECKOF [ ] [ ] [ ] [ ] THE TOTAL The Trane Company 6200 Troup Highway Tyler, TX 75707 Pub. No. 18-BC39D6-4 PJ.
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