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1-7 Step 1 — Check Equipment and Jobsite . I • UNPACKAGE UNIT • INSPECT EQUIPMENT • COMPLETE OR CONSIDER SYSTEM REQUIREMENTS Step 2 — Mount Outdoor Heat Pump .. 3 • ON THE GROUND: MOUNT UNIT ON A SOLID, LEVEL CONCRETE PAD • ON THE ROOF: MOUNT UNIT ON A LEVEL PLATFORM OR FRAME Step 3 — Make Piping Connections____ 3-5 • REPLACE THE ACCURATER™ REFRIGERANT CONTROL PISTON IN THE INDOOR COIL AS REQUIRED • CONNECT REFRIGERANT LINES Step 4 — Make Electrical Connections .. 5-7 • INSTALL A BRANCH CIRCUIT DISCONNECT PER NEC • ROUTE LINE POWER LEADS INTO UNIT • CONNECT GROUND LEAD AND POWER WIRING • SEE INDOOR UNIT AND ELECTRIC HEATER INSTALLATION, START-UP AND SERVICE INSTRUCTIONS • CONNECT CONTROL POWER WIRING (24 v) START-UP............................ 7 SERVICE............................. 7-14 MAINTENANCE...................... 14-17 SAFETY CONSIDERATIONS Installation and servicing of air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair or service air conditioning equipment. Untrained personnel can perform basic maintenance functions of cleaning coils and cleaning and replacing filters. All other operations should be performed by trained service personnel. When working on air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply. Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available for all brazing operations. WARNING: Before performing service or maintenance operations on system, turn off mam power switches to indoor unit and outdoor unit. Turn off accessory heater power switch if applicable. Electrical shock could cause personal injury'. INSTALLATION Step 1 — Check Equipment and Jobsite UNPACKAGE UNIT — Move to final location. Lift carton off, taking special care not to damage service valves or grilles. INSPECT EQUIPMENT — File claim with shipping company if shipment is damaged or incomplete. COMPLETE OR CONSIDER SYSTEM REQUIREMENTS before installing the 38QB: Consult local building codes and National Electrical Code (NEC) for special installation requirements. When installing, allow sufficient space for airflow clearance, wiring, refrigerant piping and servicing. Position so water or ice from roof cannot drop directly on top of unit. Make provisions for condensate drainage and defrost water disposal whether unit is installed on ground or roof. (Ensure unit basepan drainage holes are not blocked.) See Step 2 for details. Roof installation method for 38QB depends on building construction and special requirements of local codes. Be sure that roof can support unit weight. It is recommended that 38 QB units be used with Carrier approved indoor sections; see Table 1. System Refrigerant Control on 38QB units and matching Carrier indoor units is a factory-installed AccuRater™ device (bypass type). Bypass-type AccuRater components are discussed in the service section of this booklet. The AccuRater piston has a refrigerant metering hole thru it and is field replaceable. Table 2 indicates indoor units for which the © Carrier Corporation 1982 Form 38QB-1SIM 4'-0"(l220mm) OVERHEAD SPACE REQUIRED FOR SERVICE AND AIRFLOW ^ (22 mm} DIAM HOLE FOR CONTROL WIRING lf"(35mm) DIAM HOLE FOR POWER WIRING LIQUID VALVE SERVICE PORT f VAPOR VALVE SERVICE PORT AIRFLOW SUCTION SERVICE PORT б" (152 mm) THICK i2" (305mm) GRAVEL APRON I'-ll" (585mm) DIAM x б"(152 mm)THK CONCRETE MOUNTING PAD FOR 38QB0I8 ~ (6.35 mm) TIE DOWN BOLTS CENTERLINE BETWEEN VALVES 2-6" (762 mm) DIAM x б" (152mm) THK CONCRETE MOUNTING PAD FOR 38QB024-042 Fig. 1 — Dimensions, Connections and Mounting Pad (Refer to Table 2) I-0 (305mm) GRAVEL APRON 'MARKER TAPE (HIDDEN) CONCRETE MOUNTING PAD FOR 38QB0I8 2'-6" (762 mm) DIAM 6" (152 mm THICK CONCRETE MOUNTING PAD FOR 38QB024-042 Fig. 2 — Accessory Mounting Rack Table 1 — Carrier Approved 38QB Systems OUTDOOR UNIT 38QB REQUIRED OUTDOOR PISTON SIZE INDOOR UNIT MODEL & SIZE REQUIRED INDOOR PISTON SIZE 018 42 28HQ.VQ024 40AQ024 40DQ024 52 024 46 28HQ.VQ030 40AQ030 40DQ030 61* 030 59 28HQ,VQ036 40AQ036 70* 40AQ036 70* 036 61 28HQ.VQ042 40QB042 76 042 63 40QB042 28HQ.VQ048 76* С ‘Replace factory-installed piston with this piston size © 2 Table 2 — Installation Data (Fig. 1) REFRIGERANT CONNECTIONS Suction (ODF) Compatible Fitting (Suction) & Flare (Liquid) 5/8 3/4 sj 3/4 "May use 7/8-in (22 22-mm) accessory tubing package (slight capacity loss) See Table 3 required replacement piston is factory supplied with specified 38QB outdoor unit. Replace piston as described under AccuRater™ Servicing on page 13. Top Cover Removal — Top cover can be removed for wiring or servicing heat pump. Loosen decora-< tive strip and slide down off screw heads. Remove V 3 screws in connector plate and 2 ...