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Hersteller: Carrier Dateigröße: 506.37 kb Dateiname: Unterrichtssprache:

When properly charged, the 40RR has approximately 32° F of state point subcooling leaving circuits no. 1 and 2 from the indoor coil in the heating cycle. Use charging chart on unit to complete charging (in cooling cycle only). NOTE: Use refrigerant R-22 only. NOTE: Since the 38QP unit contains 2 refrigeration circuits, both circuits must be charged separately. To charge system: 1. Regulate valve at refrigerant (R-22) tank to maintain suction pressure at 80 psig (551.6 kPa) while charging. Charge with vapor only at suction side of unit. NOTE: Do not depend on sight glass when charging unit; use charging charts which are attached to the inside of each compressor access panel. 2. Measure line temperature close to the liquid service valve, and measure the pressure at the Schrader port on the liquid line service valve. Plot point on the charging chart. If point is above the line, add charge. If point is below the line, remove and reclaim charge until operating point falls on the curve. 3. Allow system to operate for 20 minutes. Take temperature and pressure reading at liquid service valve and check values with the charging chart. 4. Record final installed system charge in ink on unit nameplate. CHECK OIL CHARGE — Allow system to run for approximately 20 minutes. Stop system and check compressor oil level. Ten pints is the proper oil charge amount for a 6D compressor. Add oil only if necessary to bring oil into view in sight glass. Use only Carrier-approved compressor oil: Petroleum Specialties ...................Cryol 150A Texaco, Inc.........................Capella WF32 Witco Chemical Corp..................Sunisco 3GS IMPORTANT: Do not reuse drained compressor oil or oil that has been exposed to atmosphere. Procedures for adding oil are given in GTAC II, Module 5, Charging, Recovery, Recycling, and Reclamation. To remove oil: shut system off; isolate the compressor; remove and reclaim the refrigerant in the compressor; remove the compressor oil drain plug. SEQUENCE OF OPERATION General — The heat pump contains 2 independent refrigeration circuits. Each circuit has its own set of independent controls, compressor, liquid line solenoid valve, reversing valve, crankcase heater, TXV, and accumulator. Circuit breakers provide overcurrent protection for compressors (in both heating and cooling modes). These require manual reset at the 38QP unit control box. The oil pressure safety and crankcase heater also require reset at the outdoor unit. Cooling NOTE: When power is supplied to a system that is off, crankcase heaters are energized. The reversing valve may or may not be energized depending on mode of operation (heating or cooling) when thermostat was previously satisfied. The following cooling operating sequence has both heat pump circuits connected to a single, 2-circuit fan coil. The system is controlled by a single 2-stage heat/2-stage cool thermostat. 5 When the thermostat calls for first-stage cooling (TCI closed), the indoor-fan motor starts immediately. Compressor no. 1 and outdoor fan no. 1 start after 3 seconds and before 5 minutes depending on the length of time system is off after thermostat was previously satisfied. (This time process is effective because of the 5-minute Time Guard® II circuit.) The reversing valve solenoid (RVS1) deenergizes, causing the reversing valve to shift to the cooling position. The crankcase heater is off when the compressor is operating. The liquid line solenoid valve in circuit no. 1 opens, allowing refrigerant to flow. When the thermostat calls for second-stage cooling (TC2 closed), compressor no. 2 and outdoor fan no. 2 start. The reversing valve solenoid (RVS2) is deenergized, causing the reversing valve to shift to the cooling position. The liquid line solenoid in circuit no. 2 opens, allowing refrigerant flow in circuit no. 2. When the second stage of thermostat is satisfied (TC2), compressor no. 2 shuts off and outdoor-fan motor no. 2 shuts off. When the first stage of thermostat is satisfied, compressor no. 1, outdoor fan no. 1, and indoor fan shut off. The liquid line solenoid valve closes in each refrigeration circuit when the corresponding compressor shuts off. The reversing valves do not shift but remain in the cooling position until there is a call for heating. The unit is equipped with a no-dump reversing valve logic. When the unit is in the cooling mode, the reversing valve remains in cooling mode position until the thermostat calls for heating Conversely, when the unit is in the heating mode, the reversing valve remains in heating mode position until the thermostat calls for cooling. NOTE: If a malfunction occurs, causing the high-pressure switch (HPS), compressor overtemperature (COTP) safety, or loss-of-charge switch (LCS) to open, the compressor in the affected circuit is locked out by a Cycle-LOC™ circuit. This causes the Signal-LOC™ warning light to come on at the thermostat subbase. The remaining refrigeration circuit continues to ...

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