Carrier 38YCW Heat Pump User Manual
Contents
1. A98525 Fig 1 Model 38YCW 4 Leave some slack between structure and unit to absorb vibration 5 When passing refrigerant tubes through the wall seal opening with RTV or other pliable silicon based caulk See Fig 2 6 Avoid direct refrigerant tubing contact with water pipes duct work floor joists wall studs floors and walls 7 Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap that comes in direct contact with tubing See Fig 2 8 Ensure that refrigerant tubing insulation is pliable and com pletely surrounds vapor tube 9 When necessary use hanger straps which are 1 in wide and conform to shape of tubing insulation See Fig 2 10 Isolate hanger straps from insulation by using metal sleeves bent to conform to shape of insulation When outdoor unit is connected to factory approved indoor unit outdoor unit contains system refrigerant charge for operation with indoor unit of the same size when connected by 15 ft of field supplied or factory accessory tubing For proper unit opera tion check refrigerant charge using charging information located on control box cover and or in the Check Charge section of this Instruction IMPORTANT Maximum liquid line size is 5 8 in O D for all residential applications including long line applications IMPORTANT Always install a liquid line filter drier Refer to Product Data Digest for appropriate part nu2. HEATING amp COOLING 38YCW 10 SEER Split System Heat Pump Visit www carrier com Installation and Start Up Instructions NOTE Read the entire instruction manual before starting the installation This symbol indicates a change since the last issue SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electrical shock or other conditions which may cause death personal injury or property damage Consult a qualified installer service agency or your distributor or branch for information or assistance The qualified installer or agency must use factory authorized kits or accessories when modifying this product Refer to the individual instructions packaged with the kits or accessories when installing Follow all safety codes Wear safety glasses protective clothing and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thor oughly and follow all warnings or cautions included in literature and attached to the unit Consult local building codes and National Electrical Code NEC for special requirements Recognize safety information This is the safety alert symbolA When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand the signal words DANGER WARNING and CAU TION These words are used with the safety alert sy
3. POR VAPOR LONG LINE SIZE Connection Diameter Tube Diameter Connection Diameter Tube Diameter Connection Diameter Tube Diameter 018 024 3 8 3 8 3 4 3 4 3 4 3 4 030 036 3 8 3 8 3 4 3 4 3 4 7 8 042 048 3 8 3 8 7 8 7 8 7 8 1 1 8 060 3 8 3 8 7 8 1 1 8 7 8 1 1 8 NOTES 1 Tube diameters are for lengths up to 50 ft For tubing lengths greater than 50 ft consult Long Line section of the Application Guideline 2 Do not apply capillary tube indoor coils to these units Step 8 Make Piping Connections A WARNING Relieve pressure and recover all refrigerant before system repair or final unit disposal to avoid personal injury or death Use all service ports and open all flow control devices including solenoid valves A CAUTION If ANY refrigerant tubing is buried provide a 6 in vertical rise at service valve Refrigerant tubing lengths up to 36 in may be buried without further special consideration For lengths above 36 in consult your local distributor A CAUTION To prevent damage to unit or service valves observe the following Use a brazing shield eWrap service valves with wet cloth or use a heat sink material Outdoor units may be connected to indoor section using accessory tubing package or field supplied refrigerant grade tubing of cor rect size and condition For tubing requirements beyond 50 ft length or 20 ft vertical differential substantial capacity and performance losses can occur Follo
4. R FA FB FC OTHER FD FF FH HEAT _ OUTDOOR NON PROGRAMMABLE FD FF HEAT HP THERMOSTAT FAN COIL PUMP THERMOSTAT HP THERMOSTAT FAN COIL PUMP 24 VAC HOT PEVAS ROT ACCON 24 VAC COM HEAT STAGE 2 HEAT STAGE 2 COOL HEAT COOL HEAT STAGE 1 SASKI INDOOR FAN RVS COOLING o EMERGENCY EMERGENCY HEAT HEAT NOTE Remove wires from crimp nut in indoor fan coil when installing outdoor thermostat IMPORTANT When using outdoor thermostat Wo must be energized when requesting supplemental heat CARRIER CARRIER PROGRAMMABLE 40FKA PROGRAMMABLE FA FB FC THERMOSTAT FK4C HEAT THERMOSTAT FD FF FH HEAT MODEL HP FAN COIL PUMP MODEL HP FAN COIL PUMP 24 VAC HOT 24 VAC HOT INDOOR FAN INDOOR FAN HEAT STAGE 2 HEAT STAGE 2 COOL HEAT COOL HEAT STAGE 1 STAGE 1 RVS COOLING RVS COOLING NOT USED NOT USED 24 VAC COM 24NAC COM NOT USED NOTUSED IF AVAILABLE TROUBLE TROUBLE T OPTIONAL srr ne SENSOR SENSOR CONNECTION CONNEC CARRIER CARRIER PROGRAMMABLE ONE PROGRAMMABLE FA FB FC Two THERMOSTAT FA FB FC FD FF FH HEAT _ OUTDOOR THERMOSTAT FD FF FH HEAT _ OUTDOOR MODEL HP FAN COIL PUMP THERMOSTAT MODEL HP FAN COIL PUMP THERMOSTATS ODT 24 VAC HOT 24 VAC HOT INDOOR FAN INDOOR FAN HEAT STAGE 2 ODT eee COOL HEAT COOL HEAT 4 STAGE1 JEST Pp E O AaS STAGE 1 RVS COOLING RVS COOLING NOT USED NOT U
5. SED 24 VAC COM 24 VAC COM NOT USED NOT USED TROUBLE TROUBLE OPTIONAL OUTDOOR SENSOR CONNECTION OPTIONAL OUTDOOR SENSOR CONNECTION S2 NOTE Remove wires from crimp nut in indoor fan coil when installing outdoor thermostats NOTE Remove wires from crimp nut in indoor fan coil when installing outdoor thermostat IMPORTANT When using outdoor thermostats Wo must be energized when requesting supplemental heat IMPORTANT When using outdoor thermostat Wo must be energized when requesting supplemental heat A01384 Fig 6 Typical 24v Circuit Connections 6 WIRING DIAGRAM NOTES 1 CARRIER THERMOSTAT WIRING DIAGRAMS ARE ONLY ACCURATE FOR MODEL NUMBERS BEGINNING WITH TSTAT__ 2 WIRING MUST CONFORM TO NEC OR LOCAL CODES 3 SOME UNITS ARE EQUIPPED WITH PRESSURE SWITCH ES TEMPERATURE SWITCH OR 5 MINUTE COMPRESSOR CYCLE PROTECTION CONNECT 24V FIELD WIRING TO FACTORY PROVIDED STRIPPED LEADS 4 THERMOSTATS ARE FACTORY CONFIGURED WITH 5 MINUTE COMPRESSOR CYCLE PROTECTION AND 4 CYCLES PER HR LIMIT SEE THERMOSTAT INSTALLATION INSTRUCTIONS FOR DETAILS 5 TO STAGE ELECTRIC RESISTANCE HEAT CONSULT OUTDOOR THERMOSTAT INSTALLATION INSTRUC TIONS 6 UNDERLINED LETTER ON DUAL TERMINAL INDI CATES ITS USAGE FOR EXAMPLE O W2 MEANS O O W2MEANS W2 7 OUTDOOR TEMPERATURE SENSOR MUST BE AT TACHED IN ALL DUAL FUEL INSTALLATIONS JUMPER WIRE BETWEEN O W2 AND L THERMOS
6. TAT TERMINALS MUST BE PRESENT 8 Y1 AND O CONNECTIONS TO 2 STAGE FURNACES MAY NOT EXIST OR MAY ONLY BE A WIRE RATHER THAN A SCREW TERMINAL SEQUENCE OF OPERATION NOTE Defrost control board is equipped with 5 minute lockout timer that may be initiated upon any interruption of power With power supplied to indoor and outdoor units transformer is energized Cooling On a call for cooling thermostat makes circuits R O R Y and R G Circuit R O energizes reversing valve switching it to cooling position On 3 phase models with scroll compressors the units are equipped with a phase monitor to detect if the incoming power is correctly phased for compressor operation If phasing is correct circuit R Y energizes contactor starting outdoor fan motor and compressor circuit R G energizes indoor unit blower relay start ing indoor blower motor on high speed NOTE If the phasing is incorrect the contactor will not be energized To correct the phasing interchange any 2 of the 3 power connections on the field side When thermostat is satisfied its contacts open de energizing the contactor and blower relay Compressor and motors should stop NOTE If indoor unit is equipped with a time delay relay circuit the blower runs an additional 90 sec to increase system efficiency Heating On a call for heating thermostat makes circuits R Y and R G If phasing is correct circuit R Y energizes contactor starting outdoor fan motor and co
7. ambient in cooling mode is 125 F The maximum outdoor operating ambient in heating mode is 66 F Step 5 Elevate Unit A CAUTION Accumulation of water and ice in base pan may cause equipment damage In areas where prolonged freezing temperatures are encountered elevate unit per local climate and code requirements to provide clearance above estimated snowfall level and ensure adequate drainage of unit Step 6 Check Indoor And Outdoor AccuRater Piston Check indoor coil piston to see if it matches the required piston shown on outdoor unit rating plate If it does not match replace indoor coil piston with piston shipped with outdoor unit The piston shipped with outdoor unit is correct for any approved indoor coil combination A CAUTION Remove indoor coil piston if unit is to be installed on system with a TXV metering device Step 7 Check Defrost Thermostat Check defrost thermostat to ensure it is properly located and securely attached There is a liquid header with a brass distributor and feeder tube going into outdoor coil At the end of 1 of the feeder tubes there is a 3 8 in O D stub tube approximately 3 in long The defrost thermostat should be located on stub tube Note that there is only 1 stub tube used with liquid header and on most units it is the bottom circuit Table 1 Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters In UNIT LIQUID VA
8. door coil are exposed to atmosphere they must be evacuated to 500 microns to eliminate contamination and moisture in the system Follow these steps to properly start up the system 1 Fully back seat open liquid and vapor tube service valves 2 Unit is shipped with valve stem s front seated closed and caps installed Replace stem caps after system is opened to refrigerant flow Replace caps finger tight and tighten with wrench an additional 1 12 turn 3 Close electrical disconnects to energize system 4 Set room thermostat to desired temperature Be sure set point is below indoor ambient temperature 5 Set room thermostat to HEAT or COOL and fan control to ON or AUTO as desired Operate unit for a minimum of 15 minutes Check system refrigerant charge A CAUTION 3 phase scroll compressors are rotation sensitive A flashing LED on phase monitor indicates reverse rotation See Fig 7 and Table 2 This will not allow contactor to be energized Disconnect power to unit and interchange 2 field wiring leads on unit contactor Step 13 Check Charge Factory charge is shown on unit rating plate To check charge in cooling mode refer to Cooling Only Procedure on unit wiring and charging label COOLING ONLY PROCEDURE NOTE If superheat or subcooling charging conditions are not favorable charge must be weighed in accordance with unit rating plate 0 6 oz ft of 3 8 in liquid line above or below 15 ft respectiv
9. driver for 5 sec and released a short defrost cycle will be observed actual length is dependent upon the selected Quiet Shift position When Quiet Shift switch is in ON position the length of defrost is 1 minute 30 sec compressor off period followed by 30 sec of defrost with com pressor operation On return to heating operation compressor will again turn off for an additional 30 sec and the fan for 40 sec When the Quiet Shift is in OFF position only a brief 30 sec cycle will be observed If it is desirable to observe a complete defrost in warmer weather Step 1 Final Checks the thermostat must be closed as follows IMPORTANT Before leaving job be sure to do the following 1 Turn off power to outdoor unit 1 Securely fasten all panels and covers 2 Disconnect outdoor fan motor lead from OF2 on control 2 k Tighten service valve stem caps to 1 12 turn past finger tight board See Fig 8 Tape to prevent grounding 3 Leave User s Manual with owner Explain system operation 3 Restart unit in heating mode allowing frost to accumulate on n 3 and periodic maintenance requirements outlined in manual outdoor coil 4 After a few minutes in heating mode liquid line temperature CARE AND MAINTENANCE should drop below closing point of defrost thermostat ap proximately 30 F For continuing high performance and to minimize possible equip NOTE Unit will remain in defrost until defrost thermostat ment failure
10. efore starting in the heating mode 4 L0 os lt a le j gt AE mO ol e E e of gt 4 o A e N z gt 2S O gt oy sv es Oo 03 lt a y C ola lt a gt gt Co x Hy QO g b 3 Ae ee com Ed s Es a e eaS ee ee 2 ss BI g E 4 E AE i a ee dob qo bf c gt oO 5 Hea J gt E HED D CESO130076 00 Speedup Quiet Defrost interval Pins Shift DIP switches A91444 Fig 8 Defrost Control Defrost The defrost control is a time temperature control which includes a field selectable time period DIP switch 1 and 2 on the board between defrost cycles of 30 60 90 or 120 minutes factory set at 90 minutes To initiate a forced defrost two options are available depending on the status of the defrost thermostat If defrost thermostat is closed speedup pins J1 must be shorted by placing a flat head screwdriver in between for 5 sec and releasing to observe a complete defrost cycle When the Quiet Shift switch is selected compressor will be turned off for two 30 sec intervals during this complete defrost cycle as explained previously When Quiet Shift switch is in factory default OFF position a normal and complete defrost cycle will be observed If defrost thermostat is in open position and speedup pins are shorted with a flat head screw
11. ely EXAMPLE To calculate additional charge required for a 25 ft line set 25 ft 15 ft 10 ft X 0 6 oz ft 6 oz of additional charge HEATING CHECK CHART PROCEDURE To check system operation during heating cycle refer to the Heating Check Chart on outdoor unit This chart indicates whether a correct relationship exists between system operating pressure and air temperature entering indoor and outdoor units If pressure and temperature do not match on chart system refrigerant charge may not be correct Do not use chart to adjust refrigerant charge NOTE When charging is necessary during heating season charge must be weighed in accordance with unit rating plate 0 6 oz ft of 3 8 in liquid line above or below 15 ft respectively Step 14 Final Checks IMPORTANT Before leaving job be sure to do the following 1 Securely fasten all panels and covers 2 Tighten service valve stem caps to 1 12 turn past finger tight 3 Leave User s Manual with owner Explain system operation and periodic maintenance requirements outlined in manual 4 Fill out Dealer Installation Checklist and place in customer file CONTACTOR 24VAC COM ep 00 e N D O Q L O a M 4 OFF NO 24VAC ON 0K FLASH PHASE PROBLEM L2 o UU A00010 Table 2 Phase Monitor LED Indicators LED STATUS OFF No call for compressor operation FLASHING Reversed phase ON Normal Fig 7 Phase Monitor Control FA FB FC ONE OTHE
12. heck factory wiring and field wire connections to ensure terminations are secured properly Check wire routing to ensure wires are not in contact with tubing sheet metal and so forth Step 10 Compressor Crankcase Heater When equipped with a crankcase heater furnish power to heater a minimum of 24 hr before starting unit To furnish power to heater only set thermostat to OFF and close electrical disconnect to outdoor unit A crankcase heater is required if refrigerant tubing is longer than 50 ft Step 11 Install Electrical Accessories Refer to the individual instructions packaged with kits or acces sories when installing Step 12 Start Up A CAUTION To prevent compressor damage or personal injury observe the following Do not overcharge system with refrigerant Do not operate unit in a vacuum or at negative pressure Do not disable low pressure switch In scroll compressor applications eDome temperatures may be hot A CAUTION To prevent personal injury wear safety glasses protective clothing and gloves when handling refrigerant and observe the following Back seating service valves are not equipped with Schrader valves Fully back seat counterclockwise valve stem before removing gage port cap Front seating service valves are equipped with Schrader valves A CAUTION Do not vent refrigerant to atmosphere Recover during system repair or final unit disposal If refrigerant tubes or in
13. hould occur The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes Failure to follow this warning can result in an electric shock fire or death CONNECT GROUND AND POWER WIRES Connect ground wire to ground connection in control box for safety Connect power wiring to contactor as shown in Fig 5 DISCONNECT PER N E C AND OR LOCAL CODES CONTACTOR N E terested E FIELD POWER ar aaa p e BLUE SPHASEONY 2a A 3 FIELD GROUND WIRING GROUND LUG A94025 Fig 5 Line Power Connections CONNECT CONTROL WIRING Route 24v control wires through control wiring grommet and connect leads to control wiring Refer also to Installation Instruc tions packaged with thermostat Use No 18 AWG color coded insulated 35 C minimum wire If thermostat is located more than 100 ft from unit as measured along the control voltage wires use No 16 AWG color coded wire to avoid excessive voltage drop All wiring must be NEC Class 1 and must be separated from incoming power leads Use furnace transformer fan coil transformer or accessory trans former for control power 24v 40va minimum NOTE Use of available 24v accessories may exceed the mini mum 40va power requirement Determine total transformer load ing and increase the transformer capacity or split the load with an accessory transformer as required FINAL WIRING CHECK IMPORTANT C
14. ifted during shipment Ensure tubes are not rubbing against each other or any sheet metal Pay close attention to feeder tubes making sure wire ties on feeder tubes are secure and tight Step 9 Make Electrical Connections A WARNING To avoid personal injury or death do not supply power to unit with compressor terminal box cover removed Be sure field wiring complies with local and national fire safety and electrical codes and voltage to system is within limits shown on unit rating plate Contact local power company for correction of improper voltage See unit rating plate for recommended circuit protection device NOTE Operation of unit on improper line voltage constitutes abuse and could affect unit reliability See unit rating plate Do not install unit in system where voltage or phase imbalance 3 phase may fluctuate above or below permissible limits NOTE Use copper wire only between disconnect switch and unit NOTE Install branch circuit disconnect of adequate size per NEC to handle unit starting current Locate disconnect within sight from and readily accessible from unit per Section 440 14 of NEC ROUTE GROUND AND POWER WIRES Remove access panel and control box to gain access to unit wiring Extend wires from disconnect through power wiring hole provided and into unit control box A WARNING The unit cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault s
15. mber Obtain filter drier from your distributor or branch Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 4 PC 101 Catalog No 533 80020 Tab 5a 5a Printed in U S A Form 38YCW 3SI Pg 1 2 02 Replaces 38YCC 4SI NOTE Avoid contact between tubing and structure OUTDOOR WALL INDOOR WALL CAULK y Pa y LIQUID TUBE WZ t VAPOR TUBE INSULATION THROUGH THE WALL a OST HANGER STRAP AROUND VAPOR TUBE ONLY INSULATION 2 nes VAPOR TUBE o o o 17MIN gt lee N LIQUID TUBE SUSPENSION A94028 Fig 2 Connecting Tubing Installation INSTALLATION Step 1 Check Equipment and Job Site UNPACK UNIT Move to final location Remove carton taking care not to damage unit INSPECT EQUIPMENT File claim with shipping company prior to installation if shipment is damaged or incomplete Locate unit rating plate on unit service panel It contains information needed to properly install unit Check rating plate to be sure unit matches job specifications Step 2 Install on a Solid Level Mounting Pad If conditions or local codes require the unit be attached to pad tie down bolts should be used and fastened through knockouts provided in unit base pan Refer to unit mounting pattern in Fig 3 to determine base pan size and knockout hole location On rooftop application
16. mbol DAN GER identifies the most serious hazards which will result in severe personal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation A WARNING Before installing modifying or servicing system main elec trical disconnect switch must be in the OFF position There may be more than 1 disconnect switch Lock out and tag switch es with a suitable warning label Electrical shock can cause personal injury or death INTRODUCTION AND RECOMMENDATIONS NOTE In some cases noise has been traced to improper instal lation of equipment 1 Locate unit away from windows patios decks and so forth where unit operation sounds may disturb customer 2 Ensure that vapor and liquid tube diameters are appropriate to capacity of unit 3 Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends
17. mpressor Circuit R G energizes indoor blower relay starting blower motor on high speed Should temperature continue to fall R W2 is made through second stage room thermostat bulb Circuit R W2 energizes a sequencer bringing on first bank of supplemental electric heat and providing electrical potential to second heater sequencer if used If outdoor temperature falls below setting of outdoor thermostat field installed option contacts close to complete circuit and bring on second bank of supplemental electric heat When thermostat is satisfied its contacts open de energizing contactor and sequencer All heaters and motors should stop When the thermostat is satisfied its contacts open de energizing contactor and sequencer All heaters and motors should stop Quiet Shift Quiet Shift is a field selectable defrost mode which will eliminate occasional noise that could be heard at the start of the defrost cycle and restarting of heating cycle It is selected by placing DIP switch 3 on defrost board in ON position When Quiet Shift switch is placed in ON position and a defrost is initiated the following sequence of operation will occur Revers ing valve will energize compressor will turn off for 30 sec then turn back on to complete defrost At the start of heating cycle after conclusion of defrost mode reversing valve will de energize the compressor will turn off for another 30 sec and the fan will turn off for 40 sec b
18. periodic maintenance must be performed on this equipment reopens at approximately 80 F coil temperature at liquid line or remainder of defrost cycle time Frequency of maintenance may vary depending upon geographic 5 Turn off power to outdoor and reconnect fan motor lead to areas such as coastal applications OF2 on control board after above forced defrost cycle Copyright 2002 CARRIER Corp 7310 W Morris St e Indianapolis IN 46231 38ycw3si Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations reek 4 PC 101 Catalog No 533 80020 Printed in U S A Form 38YCW 3SI Pg 8 2 02 Replaces 38YCC 4SI a aj oa
19. s mount on level platform or frame 6 in above roof surface Place unit above a load bearing wall and isolate unit and tubing set from structure Arrange supporting members to adequately support unit and minimize transmission of vibration to building Consult local codes governing rooftop applications Roof mounted units exposed to winds above 5 mph may require wind baffles to achieve adequate defrost Consult Low Ambient Guideline for wind baffle construction NOTE Unit must be level to within 2 43 8 in ft per compressor manufacturer specifications Step 3 Clearance Requirements When installing allow sufficient space for airflow clearance wiring refrigerant piping and service Allow 30 in clearance to service end of unit and 48 in above unit For proper airflow a 6 in clearance on 1 side of unit and 12 in on all remaining sides must be maintained Maintain a distance of 24 in between units Position so water snow or ice from roof or eaves cannot fall directly on unit On rooftop applications locate unit at least 6 in above roof surface 3D 9 53 TIEDOWN KNOCKOUTS 2 PLACES B _ A94199 MINIMUM UNIT MOUNTING PAD SIZE 018 030 DIMENSIONS 036 060 Fig 3 Mounting Unit to Pad Step 4 Operating Ambients The minimum outdoor operating ambient in cooling mode is 55 F and the maximum outdoor operating
20. wing the recommendations in the Residential Split System Long Line Application Guideline will reduce these losses Refer to Table 1 for field tubing diam eters REFRIGERANT TUBING Connect tubing to fittings on outdoor unit vapor and liquid service valves See Table 1 Use refrigerant grade tubing Refer to appropriate section below for type of service valves installed on unit SWEAT CONNECTION A CAUTION To avoid valve damage while brazing service valves must be wrapped in a heat sinking material such as a wet cloth 1 Remove plastic retainer holding outdoor piston in liquid service valve 2 Locate adapter tube shipped with unit 3 Install strainer in adapter tube and connect tube to service valve See Fig 4 4 Connect refrigerant tubing to fittings on outdoor unit vapor and liquid service valves 5 Service valves are closed from factory and ready for brazing After wrapping service valve with a wet cloth tubing set can be brazed to service valve using either silver bearing or non silver bearing brazing material Consult local code re quirements Refrigerant tubing and indoor coil are now ready for leak testing This check should include all field and factory joints PISTON BODY PISTON PISTON RETAINER STRAINER A97512 Fig 4 Liquid Service Valve with Sweat Adapter Tube FINAL TUBING CHECK IMPORTANT Check to be certain factory tubing on both indoor and outdoor unit has not sh
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