INSTALLER`S GUID
Contents
1. 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 refrigerant charge the gas and liquid line valves must remain closed 1 Upon completion of leak check evacuate the refrigerant lines and indoor coil before opening the gas and liquid line valves 2 Attach appropriate hoses from 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 manifold center hose and connecting branch hose to a cylinder of HCFC 22 and vacuum pump PAGE 4 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 o2. was running before the short was applied PIN IDENTIFICATION z o o o LE o ul Be DEFROST CONTROL CHECKOUT Normal operation requires a LED on board flashing 1 time second b 24V AC between R amp B c 24V AC between Y amp B with unit operating d Defrost initiation when FRC DFT pin is shorted to TEST COMMON pin If a defrost control problem is suspected refer to the service informa tion in control box A WARNING Do NOT connect 24V AC to T1 ODS A terminal ODS A thermistor WILL BE BLOWN I OPERATIONAL AND CHECKOUT PROCEDURES Final phases of this installation are the unit Operational and Checkout Procedures which are found 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 nameplate 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 PAGE 5 INSTALLER S GUIDE A TYPICAL F
3. IELD WIRING DIAGRAM FOR SPLIT SYSTEM HEAT PUMPS TWX018 060 WITH AIR HANDLERS A TYPICAL FIELD WIRING DIAGRAM FOR SPLIT SYSTEM HEAT PUMPS TWX018 060 WITH VARIABLE SPEED AIR HANDLERS 4th WIRE REQUIRED FOR 3 PH From Dwg 21B131071 Rev 2 PAGE 6 Pub No 18 BC39D6 4 INSTALLER S GUIDE TWX018 060 OUTLINE DRAWING SERVICE PANEL ELECTRICAL AND REFRIGER COMPONENTS CLEARANCE PER PREVAILING CODES UNIT SHOULD BE PLACED SO ROOF RUN OFF WATER DOES NOT POUR DIRECTLY QN UNIT AND SHOULD BE AT LEAST 305 112 FROM WALL AND ALL SURROUNDING SHRUBBERY ON TWO SIDES OTHER TWO SIDES UNRESTRICTED 330 403 15 7 8 28 6 1 1 8 DIA WITH 22 2 7 8 DIA HOLE ELECTRICAL POWER SUPPLY 22 2 7 8 DIA HOLE LOW VOLTAGE PRESSURE Taps TS 1 4 FLARE FITTINGS 229 ny EL LIQUID LINE SERVICE GAS LINE BALL SERVICE VALVE E O D FEMALE 4 lb VALVE BALL 1 4 TURN BRAZED CONNECTION D O D FEMALE BRAZED WITH 1 4 SAE FLARE CONNECTION WITH 1 4 SAE PRESSURE TAP FITTING FLARE PRESSURE TAP FITTING 60 2 3 8 us ae TWXO24C 34 34 33 3 4 TWX030D 38 7 8 33 3 4 TWX036D 35 172 78 TWXO60C 50 78 39 34 3 8 From Dwg 21D147482 R
4. S FRANE It s Hard To Stop A Trane INSTALLER S GUIDE 18 BC39D6 4 Library Product Section Product Model Literature Type Sequence Date File No Supersedes Model TWX018 024C TWX030 048D amp 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 Flow Control Check Valve F C C V assembly for refrigerant flow control 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 withst
5. UNIT SIDE OF SERVICE VALVE E HEX HEADED VALVE SYSTEM Q EE NOTE Large diameter tubing will be very difficult to rebend once it has been shaped LIQUID LINE CONNECTION RETAINING RING 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 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 1 4 TURN ONLY COUNTERCLOCKWISE FOR FULL OPEN TS POSITION gt UNIT SIDE a GR VALVE STEM OF VALVE ESS Be PRESSURE TAP PORT GAS LINE CONNECTION COOLING Pub No 18 BC39D6 4 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 Wher
6. and 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 better drainage of snow and ice melted during defrost cycle prior to its refreezing 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 Ifpossible avoid locations that are likely to accumulate snow drifts If not possible a snow drift 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 from the unit Also allow for proper American Standard Inc 2000 WAMU AA AAA SAMOS LENT maintenance space The barrier should be constructed of mate rials which will blend in with the building design 3 Avoid locating the unit where condensatio
7. arp 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 PAGE 3 INSTALLER S GUIDE HEAT pu 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 A 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
8. cedures 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 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 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 a
9. control is an Accutron 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 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 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 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 Pub No 18 BC39D6 4 LIQUID LINE SERVICE VALVE
10. e 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 Pub No 18 BC39D6 4 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 22 ANG 20 AWG MAX WIRE LENGTH 30 FT 100 FT 150 FT 225 FT 300 FT 18 AWG 16 AWG 14 AWG 22 AWG is used make sure it is high quality wire 7 Table 1 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 handler and the heaters H DEFROST CONTROL 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 measu
11. e 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 A WA R N G 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 ofthe valve body Ifthe retaining ring is 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 full 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 sh
12. ev 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 eene nennen 2 Suction Lines and Fittings properly insulated nennen 3 Have all Refrigerant Lines been secured and isolated 4 Have passages through masonry been sealed If mortar is used prevent mortar from coming into direct contact with copper tubing ce ceeeeceeeeeeeeneeeeeeeeceeeeeeeeeeeeeaeeseeeeeesaaeeseaeeeeeeeeeeaeeesaa 5 Indoor coil drain line drains freely Pour water into drain 6 Supply registers and return grilles open and unobstructed mmmmmsverrrrrnvvrrrrrrrrrvrrrrrarrrrrrrrnnvsrrrrrnnnen 7 Return air filter installed tree eoe ae RE ETE PR XR EIE 8 Thermostat thermometer is accurate Check against a reliable thermometer Adjust per instructions with thermostat enne nnne nennen nennen 9 Is correct speed tap being used Indoor blower motor rrrrnvrrrrrnnnvvrrnrrnnrrrrrnnnnnvnrrrnnrrvnnrnrnnrrersrrnnnnn SYSTEM OPERATIONAL CHECK IMPORTANT To prevent compressor damage which may result from the presence of LIQUID refrigerant in the crankcase these pro
13. n manifold gauge set and remove refrigerant charging hoses from liquid and gas pressure tap ports NOTE 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 valve An Adjustable or 3 4 Open End wrench is required to take off the valve stem cap 9 The liquid line shut off valve can now be opened Remove shut off valve cap Fully insert hex wrench into the stem 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 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 off valve cap and turning the valve stem 1 4 turn counterclockwise See Figure 5 For brass gas line service valve opening follow items 9 amp 10 above 12 The gas valve is now open for refrigerant flow Replace valve stem cap to prevent leaks See Figures 4 amp 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 th
14. n 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 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 amp 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 amp any other side requiring service access to meet National Electrical Code The unit must be far enough away from any structure to prevent excess roof run off water from pouring directly on the unit 3 These units are shipped with 4 4 mounting legs and 8 rubber 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 locati
15. nd safety label if any is attached 2 Check on field wiring for sound connections and grounding according to codes 1 3 Check fuses for proper size per nameplate specifications 9 4 Check control box panel in place and NOTE OPERATION OF HEATERS MUST BE CHECKED DURING THE OPERATION CHECK OF THE TOTAL SYSTEM The Trane Company 6200 Troup Highway TechnicalLiterature Printed in U S A Tyler TX 75707 PAGE 8 Pub No 18 BC39D6 4 PA
16. on 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 from outdoor to indoor unit should NOT exceed sixty 60 feet 7 Maximum difference in elevation should not exceed sixty 60 feet NOTE Refer to Refrigerant Piping Software Pub No 32 3312 01 8 Locateandinstall 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 amp ISOLATOR LOCATION UNIT UNIT LEG ISOLATORS 2 PER LEG LOOSEN TWO SCREWS AND SLIDE SLOT OF LEG UNDER HEAD OF SCREWS AND TIGHTEN TYPICAL 4 CORNERS PAGE 2 BRAZE TYPE INDOOR END SEALING CAP ACCUTRON COMPONENTS c 3 FLOW CONTROL CHECK VALVE F C C V ORIFICE rs e BODY FIELD SUPPLIED LIQUID LINE 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 FLOW CONTROL VALVE If the indoor unit System Refrigerant Flow
17. re 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 for termination of the defrost cycle FAULT DETECTION A fault condition is indicated by the flashing light on the defrost control inside the heat pump control box In normaloperation 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 for that unit PIN IDENTIFICATION See Figure 7 1 TEST COMMON Shortinganyof theother pinstothis 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 Shorting TEST COMMON tothis pin speeds up all defrost board timings 3 Forced Defrost Short TEST COMMON to this pin for two 2 seconds to initiate a forced defrost Remove the short after defrost initiates Pub No 18 BC39D6 4 INSTALLER S GUIDE 4 LOW FAN Low speed Fan test mode Short TEST COMMON to this pin to force the outdoor fan to low speed When the short is removed the fan will go to high speed for approximately 15 seconds and then return to the speed it
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