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Manafacture: Carrier File size: 506.37 kb File name: 38qp-5si.pdf Language of manual:

40RR900271 NOTE: Read and become familiar with these instructions before beginning installation. SAFETY CONSIDERATIONS Installing and servicing air-conditioning equipment can be hazardous due to system pressures and electrical components. Only trained and qualified service personnel should install or service air-conditioning equipment. When working on air-conditioning equipment, observe the precautions provided in literature, and on tags and labels attached to the unit. A WARNING Electrical shock can cause personal injury or death. Before beginning any modification or installation of this package, be sure the main electrical disconnect is in the off position. Ensure power is disconnected to the fan coil unit. On some systems both the fan coil and the outdoor unit may be on the same disconnect. Tag the disconnect switch with a suitable warning label. GENERAL The accessory heat pump piping package is designed for use with the Carrier 38QP024 heat pump (outdoor section) in combination with the 40RR024 fan coil unit (indoor section) (see Fig. 1). Special accessories are available for electrical control of this system. Electric heaters for the 40RR024 are a field-installed accessory. Ensure that all material required for installation is available at the jobsite, including the 38QP024 outdoor section, the 40RR024 indoor section, piping package, electrical control package, and 40RT electric heater packages. The Sporlan part no. G8 nozzle is used for both the upper (circuit no. 2) and lower (circuit no. 1) coil sections of the indoor unit. Nozzles are shipped as standard parts of the factory-installed 40RR distributor. Distributor sizes are as follows: COIL SECTION DISTRIBUTOR SIZE (in. OD) Upper (Ckt 2) Lower (Ckt 1) 7/8 7/8 OUTDOOR SECTION 38QP024 INDOOR SECTION 40RR024 Fig. 1 — 38QP024/40RR024 Heat Pump System Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 11 PC 111 Catalog No 563-710 Printed in U.S.A Form 38QP-5SI Pg 1 11-92 Replaces: New Tab 5a Accessories INSTALLATION PIPING PACKAGE — Contains check valves, thermostatic expansion valves (TXV’s), receiver, filter driers, and tubing to connect the indoor coils for heat pump service. THERMOSTAT HH07AT172 (HH07AT162 For Use on Celsius Scale) — Used with subbase HH93AZ174, is a 2-stage cool/2-stage heat thermostat with automatic changeover and a lockout light. There is no provision for emergency heat. THERMOSTAT HH07AT172 (HH07AT162 For Use on Celsius Scale) — Used with subbase HH93AZ177, is a 2-stage cool/2-stage heat thermostat. This combination has all the features of HH07AT172 (HH07AT162)/HH93AZ174 plus a provision for emergency heat. SEQUENCER PACKAGE — Can be used with this system when unloaders are added to the compressor(s). (Unloading can be applied in the cooling cycle only. Unloading can never be applied in the heating cycle.) The sequencer has 4-stage cooling capability. ELECTRIC HEATERS — May be used with the 40RR indoor unit (see Table 1). Use a maximum of four 20-kW (at 240 v) or 21.8-kW (at 480 v) electric heater assemblies. ELECTRIC HEATER CONTROL PACKAGE 40RT900081 — Provides control for up to 3 stages of electric heat when used with outdoor-air thermostat(s). Package must be used whenever 40RT electric heaters are utilized. If a fourth stage of electric heat is used, an additional field-supplied heater control relay is necessary. This relay must have a 24-v coil with 230-v contacts. Outdoor thermostats (part no. HH22QA040) are recommended for staging electric heaters. Table 1 — Unit 40RR Accessory Electric Heaters ELECTRIC HEATER (3 PHASE 50/60 Hz) PART NO. Rated Voltage kW FLA 40RT-900-101 240 20.0 48 0 40RT-900-111 480 21.8 26.0 LEGEND FLA — Full Load Amps NOTES: 1. A maximum of 4 electric heaters can be used with the 40RR024 unit. 2 Electric heaters are not UL (Underwriters’ Laboratories) listed for the 38QP/40RR heat pump. WATTAGE MULTIPLICATION FACTORS Heater Voltage Rating Actual Heater Voltage (3 Phase, 50/60 Hz) Multiplication Factor 200 0.69 208 0.75 240 220 0.84 230 0.92 240 1.00 380 0.63 400 0 69 480 415 440 0.75 0.84 460 0.92 480 1.00 Example: 20.0 kW (at 240 v) heater on 230 v = 20.0 (0.92 multiplication factor) = 18.4 kW capacity at 230 v Step 1 — Perform Outdoor and Indoor Unit Installation — Follow the installation instructions provided with each outdoor and indoor unit. See Table 2 for maximum vertical elevation between the indoor and outdoor sections. Table 2 - Maximum Vertical Separation HEIGHT OF INDOOR UNIT SYSTEM Above Outdoor Unit Below Outdoor Unit ft m ft m 40RR024/38QP024, 60 Hz, Ckt 1 and 2 40RR024/38QP024, 50 Hz, Ckt 1 and 2 59 58 180 17.7 59 58 18.0 17.7 Step 2 — Size Piping Lines — Employ one of the following methods to size interconnecting refrigerant piping between the 38QP and the 40RR: 1. Use the pipe sizes shown in Refrigerant (R-22) Charge...

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