38YKC Heat Pump—Outdoor Section Installation
Contents
1. A91327 SYSTEMS WITHOUT OUTDOOR THERMOSTATS INDOOR OUTDOOR INDOOR OUTDOOR THERMOSTAT SPLICE SPLICE DEFROST THERMOSTAT TERMINAL SPLICE DEFROST SUBBASE CONNECTION CONNECTION BOARD SUBBASE BOARD CONNECTION BOARD P AR E VERE 8 H a ea beei a T L a AY aL oie eee oa eee PA 7 E a l Ale E MA HATAL E REL FACTORY WIRING FIELD WIRING _ FIELD SPLICE USED WITH FDS FF1 FA4 FB4 FC4 FH4 FAN COILS USED WITH FK4B FAN COIL A91326 Fig 7 Typical Circuit Connections Copyright 1994 CARRIER Corp 7310 W Morris St Indianapolis IN 46231 43003c 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 563 797 Printed in U S A Form 38YKC 1SI Pg 6 4 94 Replaces 38YKB 4SI al ajoa2. A88160 Fig 1 Model 38YKC clearance on 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 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 Step 3 Elevate Unit For proper drainage the heat pump must be raised off the mounting surface Fig 4 shows unit with accessory heat pump feet installed Use accessory heat pump snow rack in areas where prolonged subfreezing temperatures or heavy snow occur Refer to separate Installation Instructions packaged with the accessories Step 4 Replace Indoor AccuRater Piston if required Check indoor coil piston to see if it matches the required piston shown on unit rating plate See Fig 2 If it does not match replace indoor coil piston with piston shipped with this unit The piston shipped with outdoor unit is correct for any approved indoor coil combination Manufacturer reserves the right to discontinue or change at any time s
3. Ca lt Carrier gt ee HEATING amp COOLING 38YKC Heat Pump Outdoor Section Installation and Start Up Instructions NOTE Read the entire instruction manual before starting the installation SAFETY CONSIDERATIONS Improper installation adjustment alteration service maintenance or use can cause explosion fire electrical shock or other conditions which may cause 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 pack aged with the kits or accessories when installing Follow all safety codes Wear safety glasses and work gloves Use quenching cloth for brazing operations Have fire extinguisher available Read these instructions thoroughly and follow all warnings or cautions attached to the unit Consult local building codes and the National Electrical Code NEC for special instal lation requirements Recognize safety information This is the safety alert symbol A When you see this symbol on the unit or in instructions and manuals be alert to the potential for personal injury Understand the signal word DANGER WARNING or CAU TION These words are used with the safety alert symbol DAN GER identifies the most serious hazards which will result in severe personal inj
4. former for control power 24 v 40 va minimum NOTE Use of available 24 v accessories may exceed the mini mum 40 va power requirement Determine total transformer load ing and increase the transformer capacity or split the load with an accessory transformer as required NOTE The defrost timer is factory set for 90 minute cycles The timer can be field set for 30 and 50 minute cycles depending on defrost conditions in your geographic location Step 7 Install Electrical Accessories Refer to the individual instructions packaged with the kits or accessories when installing A CAUTION Damage may occur to the scroll compressor if operated at a negative suction pressure during a system pumpdown Step 8 Start up 1 If equipped with a crankcase heater energize a minimum of 24 hrs before starting unit To energize heater only set thermostat at OFF position and close electrical disconnect to outdoor unit 2 Fully open liquid and vapor service valves 3 Unit is shipped with valve stem s front seated and caps installed Replace stem caps after system is opened to refrig erant flow Replace caps finger tight and tighten additional 1 6 turn using a backup wrench on valve body flats to prevent distortion of sheet metal 4 Close electrical disconnects to energize system 5 Set room thermostat at desired temperature 6 Set room thermostat at HEAT or COOL and fan switch at ON or AUTO as desired Operate unit for 15 min
5. AROUND VAPOR TUBE ONLY INSULATION VAPOR TUBE O fe O 3 17MIN gt ee X LIQUID TUBE SUSPENSION A94028 Fig 3 Piping Installation OUTDOOR UNIT CONNECTED TO FACTORY APPROVED INDOOR UNIT Outdoor unit contains correct system refriger ant charge for operation with indoor unit noted in ARI directory as tested combination when connected by 15 ft of field supplied or factory accessory tubing Check refrigerant charge for maximum efficiency See Section 9 Checking Charge REFRIGERANT TUBING Connect tubing to fittings on out door unit vapor and liquid service valves See Fig 2 and 5 SWEAT CONNECTION Remove plastic retainer holding out door piston in the liquid service valve and connect sweat flare A88277 Fig 4 Accessory Heat Pump Feet PISTON PISTON RETAINER A ADAPTER NANEN STRAINER A94029 Fig 5 Service Valve with Sweat Adapter Tube adapter provided to valve See Fig 5 Connect refrigerant tubing to fittings on outdoor unit vapor and liquid service valves Service valves are closed from factory and ready for brazing After wrapping the service valve with a wet cloth the tubing set can be brazed to the service valve using either silver bearing or non silver bearing brazing material Consult local code requirements Refrig erant tubing and indoor coil are now ready for leak testing This check should include all field and factory joints A WARNING Relieve pressure and reco
6. should stop Defrost The defrost control is a time temperature control which includes a field selectable quick connects located at board edge time period between defrost cycles 30 50 and 90 minutes factory set at 90 minutes The electronic timer and the defrost cycle will start only when the contactor is energized and the defrost thermostat is closed The defrost mode is identical to the cooling mode except that the outdoor fan motor stops and a second stage heat is turned on to continue warming the conditioned space Step 9 Checking Charge Factory charge is shown on unit rating plate See Fig 2 Adjust charge in cooling mode by following procedure shown on the subcooling charge tables located on unit information plate Check charge in heating by following procedure shown on heating check chart located on unit information plate A WARNING Service valve gage ports are equipped with Schrader valves To prevent personal injury wear safety glasses and gloves when handling refrigerant 4 CAUTION Compressor damage may occur if system is overcharged 4 CAUTION Do not vent refrigerant to atmosphere Recover during system repair of final unit disposal CARE AND MAINTENANCE For continuing high performance and to minimize possible equip ment failure it is essential that periodic maintenance be performed on this equipment Consult your servicing contractor or User s Manual for the proper frequ
7. UID O p LINE CONN O Es E O T eT A92485 UNIT SIZE In 018 024 27 1 2 030 036 34 15 16 042 060 34 15 16 Fig 2 Unit Reference Drawing Table 1 Refrigerant Connections A CAUTION and Recommended Liquid and k DO NOT BURY MORE THAN 36 IN OF REFRIGERANT Vapor Tube Diameters In y a 30 INO G TUBING IN GROUND If any section of tubing is buried UNIT LIQUID there must be a 6 in vertical rise to the valve connections on SIZE Connect Tube Connect Tube the outdoor unit If more than the recommended length is Diameter Diameter Diameter Diameter buried refrigerant may migrate to cooler buried section 018 024 3 8 3 8 5 8 5 8 during extended periods of unit shutdown causing refrigerant 030 036 3 8 3 8 3 4 3 4 slugging and possible compressor damage at start up 042 048 3 8 3 8 7 8 7 8 N 2 060 3 8 3 8 7 8 1 1 8 Step 5 Make Piping Connections Note Tube diameters are for lengths up to 50 ft For tubing lengths greater than Outdoor units may be connected to indoor sections using accessory 50 ft consult Long Line Application Guideline tubing package or field supplied refrigerant grade tubing of correct size and condition For tubing requirements beyond 50 ft consult Long Line Application Guideline which is available from your local distributor A CAUTION In some cases noise in the living area has been traced to gas pulsations from improper installation of equ
8. ency of maintenance Frequency of maintenance may vary depending upon geographic areas such as coastal applications Step 1 Leave User s Manual With Homeowner Explain system operation and maintenance procedures outlined in User s Manual SYSTEMS WITH ONE OUTDOOR THERMOSTAT SYSTEMS WITH TWO OUTDOOR THERMOSTATS THERMOSTAT INDOOR OUTDOOR DEFROST THERMOSTAT INDOOR OUTDOOR DEFROST SUBBASE SPLICE SPLICE BOARD SUBBASE SPLICE SPLICE BOARD CONNECTION CONNECTION CONNECTION CONNECTION x Z aa Hae lis ah e e SSO sar FP aa pe had 2 LATA bi edie eel ATEAN mai I I w fe SEE 7 A 6 W CL PAL i Ne ODT l 2S f L df ge g l Ipc SU sf se he J st z T ahehe oul 29 SHR L IN i 1 DA i Yeobee teh yam Ee 7 Le Miao sr eye eses 1 7 1 e l I i ODT LA B A A a eZ al HEN eee XIR Ta IREA ees Er amac E E 7_ 1 e IEN e eed Fa es AlL A EA A A E FACTORY WIRING FIELD WIRING ODT OUTDOOR THERMOSTAT EHR EMERGENCY HEAT RELAY _ FIELD SPLICE USED WITH FB4 FB5 FC4 FA4 FH4 FAN COILS USED WITH FB4 FB5 FC4 FA4 FH4 FAN COILS REMOVE WIRES FROM CRIMP NUT IN INDOOR FAN COIL WHEN INSTALLING OUTDOOR THERMOSTATS IMPORTANT WHEN USING OUTDOOR THERMOSTATS W MUST BE ENERGIZED WHEN REQUESTING SUPPLEMENTAL HEAT
9. ipment INSTALLATION RECOMMENDATIONS 1 Locate the unit away from windows 2 Ensure that vapor and liquid tube diameters are appropriate to the capacity of the unit See Table 1 3 Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends 4 Leave some slack between the structure and the unit to absorb vibration 5 When passing refrigerant tubes through the wall seal the opening with RTV or other pliable silicon based caulk See Fig 3 6 Avoid direct tubing contact with water pipes ductwork floor joists wall studs floors and walls 7 Do not suspend refrigerant tubing from joists and studs with a rigid wire or strap which comes in direct contact with the tubing See Fig 3 8 Ensure that tubing insulation is pliable and completely sur rounds the vapor tube 9 When necessary use hangar straps which are 1 in wide and conform to the shape of the tubing insulation See Fig 3 10 Isolate the hangar straps from the insulation by using metal sleeves bent to conform to the shape of the insulation If refrigerant tubes or indoor coil is exposed to atmospheric conditions for longer than 5 minutes it must be evacuated to 500 microns to eliminate contamination and moisture in the system NOTE Avoid contact between tubing and structure INDOOR 4 OUTDOOR WALL 6 LIQUID TUBE WA t VAPOR TUBE INSULATION THROUGH THE WALL ge 0ST HANGER STRAP
10. pecifications or designs without notice and without incurring obligations Book 1 4 PC 101 Catalog No 563 797 Tab 5a 5a Printed in U S A Form 38YKC 1SI Pg 1 4 94 Replaces 38YKB 4SI AIR DISCHARGE y 3 8 DIA TIEDOWN KNOCKOUTS 2 PLACES IN BASEPAN NOTES 1 ALLOW 30 CLEARANCE TO SERVICE END OF UNIT 40 ABOVE UNIT 6 ON ONE SIDE 12 ON REMAINING SIDE AND 24 BETWEEN UNITS FOR PROPER AIRFLOW 2 MINIMUM OUTDOOR OPERATING AMBIENT IN COOLING MODE IS 55 F UNLESS LOW AMBIENT CONTROL IS USED MAX 125 F 3 MAXIMUM OUTDOOR OPERATING AMBIENT IN HEATING MODE IS 66 F 4 SERIES DESIGNATION IS THE 13TH POSITION OF THE UNIT MODEL NUMBER AIR DISCHARGE A 5 CENTER OF GRAVITY AIR IN F DIA SERVICE LINE CONN UNIT RATING PLATE A Sel AIR DISCHARGE A i i x A FIELD POWER i SUPPLY CONN 3 7 8 DIA HOLE WITH 1 1 8 DIA KNOCKOUT AND 1 3 8 DIA KNOCKOUT O ACCESS XSL FELD CONTROL PANEL SUPPLY CONN 7 g DIA HOLE ai conn RRS PARERE ROMNAPOUS N Ece ij O 3 8 DIA LIQ
11. sor terminal box cover removed ROUTE GROUND AND POWER WIRES Remove access panel and control box cover to gain access to unit wiring Extend wires from disconnect through power wiring hole provided and into unit control box See Fig 2 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 6 DISCONNECT PER N E C AND OR LOCAL CODES CONTACTOR EEEE A E FIELD POWER SR RR ey BLUE 3PHASEONY 2a A S FIELD GROUND WIRING GROUND LUG A94025 Fig 6 Line Power Connections A WARNING According to NEC ANSI NFPA 70 and local codes the cabinet must have an uninterrupted or unbroken ground to minimize personal injury if an electrical fault should occur The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes Failure to follow this warning could result in an electric shock fire or death CONNECT CONTROL WIRING Route 24 v control wires through control wiring grommet and connect leads to control wiring terminal board See Fig 7 Use No 18 AWG color coded insulated 35 C minimum wires If thermostat is located more than 100 ft from unit as measured along the control voltage wires use No 16 AWG color coded wires to avoid excessive voltage drop Use furnace transformer fan coil transformer or accessory trans
12. ury 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 A WARNING Before installing or servicing system always turn off main power to system There may be more than 1 disconnect switch Turn off accessory heater power if applicable Elec trical shock can cause personal injury or death 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 corner panel See Fig 2 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 tiedown bolts should be used and fastened through knockouts provided in unit base pan Refer to unit mounting pattern in Fig 2 to determine base pan size and knockout hole location 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
13. utes Check system refrigerant charge See Section 9 SEQUENCE OF OPERATION With power supplied to indoor and outdoor units transformer is energized Cooling On a call for cooling the thermostat makes circuits R O R Y and R G Circuit R O energizes the reversing valve switching it to cooling position Circuit R Y energizes the contactor starting outdoor fan motor and compressor circuit R G energizes the indoor unit blower relay starting the indoor blower motor on high speed When the thermostat is satisfied its contacts open de energizing the contactor and blower relay Compressor and motors should stop Heating On a call for heating the thermostat makes circuits R Y and R G Circuit R Y energizes contactor starting outdoor fan motor and compressor Circuit R G energizes the indoor blower relay start ing the blower motor on high speed Should the temperature continue to fall R W2 is made through the second stage room thermostat bulb Circuit R W2 energizes a sequencer bringing on the first bank supplemental electric heat and providing electrical potential to the second heater sequencer if used If the outdoor temperature falls below the setting of the outdoor thermostat field installed option the contacts close to complete the circuit and bring on the second bank of supplemental electric heat When the thermostat is satisfied its contacts open de energizing the contactor and sequencer All heaters and motors
14. ver 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 4 CAUTION Do not vent refrigerant to atmosphere Recover during system repair or final unit disposal A CAUTION A brazing shield MUST be used when tubing sets are being brazed to the service valves to prevent damage to the painted unit surface A CAUTION To avoid valve damage while brazing service valves must be wrapped with a heat sinking material such as a wet cloth Step 6 Make Electrical Connections 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 may fluctuate above or below permissible limits NOTE Use copper wire only between disconnect switch and unit NOTE Install branch circuit disconnect per NEC of adequate size to handle unit starting current Locate disconnect within sight from and readily accessible from unit per Section 440 14 of NEC A WARNING To avoid personal injury or death do not supply power to unit with compres
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