Carrier 38AYB Heat Pump User Manual
Contents
1. Ca lt Carrier gt ee HEATING amp COOLING 38YCB P 38AYB 38BYB Split System Heat Pump Model Specific Instructions NOTE Read the entire instruction manual before starting the installation Refer to Split System Heat Pump Common Installa tion and Start Up Practices included in this packet 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 symbol A When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury Understand the signal word DANGER WARNING or CAU2. valve and recover refrigerant in tubing 5 Back off locknut and ferrule onto tube 6 Remove damaged part of tubing using tubing cutter Repeat installation procedure previously outlined using new ferrule 7 Evacuate tubing set and indoor coil Check for leaks 8 Open service valves or recharge unit Check refrigerant charge LOCK NUT TUBING MARK ON LOCK NUT AND TUBE A92122 Fig 6 Proper Marking of Valve Assembly NOTE A thermostatic expansion valve TXV is required on all 38BYB units Step 4 refers to the installation of the TXV Step 4 Remove Indoor AccuRater Piston and Insiall TXV A CAUTION For proper unit operation and reliability units must be installed with a field supplied hard shut off TXV Do not install with evaporator coils having capillary tube metering devices or piston After removing existing AccuRater from indoor coil install field supplied bi flow hard shut off TXV kit See Fig 7 and 8 SENSING BULB EQUALIZER TUBE THERMOSTATIC EXPANSION VALVE A88382 Fig 7 Typical TXV Installation 10 O CLOCK 2 O CLOCK a Fas SUCTION TUBE 4 8 O CLOCK 4 O CLOCK 7 IN OD amp SMALLER LARGER THAN 7 IN OD A81032 Fig 8 Positioning of Sensing Bulb For TXV kit part number and charging instruction refer to TXV label in your unit If the indoor unit fan coil comes factory equipped with a bi flow hard shut off TXV no TXV change
3. IELD CONTROL SUPPLY CONN 7 DIA HOLE SUCTION LINE CONN LIQUID LINE CONN A93578 LIQUID TUBE VAPOR TUBE UNIT S2E Conn Dia Tube Dia Conn Dia Tube Dia 018 024 3 8 3 8 5 8 5 8 030 036 3 8 3 8 3 4 3 4 042 048 3 8 3 8 7 8 7 8 060 3 8 3 8 7 8 1 1 8 Tube diameters are for lengths up to 50 ft For tubing lengths greater than 50 ft consult your local distributor Fig 2 Refrigerant Tube Dimensions Connections PISTON BODY PISTON PISTON RETAINER Q XL LIQUID SERVICE x VALVE ADAPTER oe FERRULE XL LOCK NUT A94030 Fig 3 Liquid Service Valve Mechanical Fitting Assembly 38YCP Model NOTE A backup wrench on the hex part of the suction valve fitting is required while tightening A CAUTION The tube end must stay bottomed in the service valve during final assembly to ensure proper seating sealing and rigidity MECHANICAL FITTING REPAIR To replace damaged ferrule or tubing proceed as follows 1 Attach gages to service valves 2 Close liquid service valve and operate unit in cooling mode to pump refrigerant charge into condenser coil 3 When suction pressure reaches 5 psig shut unit off Do not operate unit in a vacuum VALVE FITTING FERRULE LOCK NUT A92120 Fig 4 Suction Service Valve with Mechanical Adapter 38YCP Model FERRULE LOCK NUT TUBING A92121 Fig 5 Lock Nut Ferrule Positioning 4 Close suction service
4. ONS UNIT SIZE DIM IN 7 3 gt In In In 38YCB P 018 030 38AYB018 22 1 2 X 22 1 2 3 11 16 18 1 8 14 3 8 38BYB018 38YCB P 036 060 38AYB024 060 30 X 30 6 1 2 23 1 2 20 38BYB024 060 Fig 1 Mount Unit to Pad 3 Remove lock nut and ferrule from plastic bag taped to service panel See Fig 4 Remove the lock nut and ferrule from liquid service valve adapter See Fig 3 4 CAUTION If undersized damaged or elliptically shaped tubing is used when making connection leaks could result 4 Slide the lock nut and ferrule onto each tube See Fig 5 5 Apply a few drops of refrigerant oil to the ferrule and valve threads and adapter threads to reduce assembly torque and assist sealing 6 Insert tube end into the service valve or adapter until it bottoms 7 Push the ferrule into place and hand tighten the nut until an increase in torque is felt 8 Mark the nut and tube and tighten 1 1 2 turns from the mark See Fig 6 Keep the tube bottomed in the valve and adapter while tightening nut 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 563 809 Tab 5a 5a Printed in U S A Form 38YCB 2SI Pg 1 6 96 Replaces 38YCB 1SI AIR DISCHARGE vA a FIELD POWER SUPPLY CONN 7 DIA HOLE WITH 1 1 DIA KNOCKOUT AND 1 3 DIA KNOCKOUT F
5. Replaces 38YCB 1SI al a 5a
6. TION These words are used with the safety alert symbol 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 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 with a suitable warning label Electrical shock can cause personal injury or death INSTALLATION Step 1 Mount Unit to Pad Refer to Fig 1 for pad dimensions and dimensions needed to mount unit to pad Step 2 Refrigerant Tubing Refer to Fig 2 for refrigerant tube dimensions and connections Step 3 Mechanical Connection 38YCP Model 1 Remove plastic retainer holding outdoor piston and piston retainer in the liquid service valve Connect and tighten the liquid service valve adapter to the valve body prior to assembling ferrule lock nut See Fig 3 2 Cut tubing to the correct length deburr and size as necessary making sure tube ends are square If a large burr is evident the ID and OD must be deburred to allow the tube to bottom in valve 3D 9 53 TIEDOWN KNOCKOUTS 2 PLACES B _ A94199 TIEDOWN KNOCKOUT MIN PAD LOCATI
7. is required Install TXV kit to indoor coil as follows 1 Install suction tube adapter 2 Install liquid flare to sweat adapter 3 Connect external equalizer tube to fitting on suction tube adapter 4 Position sensing bulb on horizontal portion of suction tube adapter Secure using supplied hardware 5 Insulate bulb after installation See Fig 8 6 Leak check all connections SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual including e Unit Familiarization e Maintenance e Installation Overview e Operating Sequence A large selection of product theory and skills programs is available using popular video based formats and materials All include video and or slides plus companion book Classroom Service Training plus hands on the products in our labs can mean increased confidence that really pays dividends in faster troubleshooting fewer calloacks Course descriptions and schedules are in our catalog CALL FOR FREE CATALOG 1 800 962 9212 Packaged Service Training Classroom Service Training A94328 Copyright 1996 CARRIER Corp 7310 W Morris St e Indianapolis IN 46231 38ycb2si SS a FP EY 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 563 809 Printed in U S A Form 38YCB 2SI Pg 4 6 96
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