Page 2 - CAUTION; A CAUTION
• Allow sufficient space for airflow clearance, wiring, refrigerant piping and servicing unit. See Fig. 1. • Locate unit so that condenser airflow is unrestrieted on all sides and above. • Unit has legs for mounting on level pad. See Fig. 2 and Table 1 for weight distribution based on recommended su...
Page 3 - Table 2 — Physical Data; Fig. 3 — Component Locations
SUCTION PIPING AT INDOOR COIL AND TXV BULB LOCATION — The purpose of these recom mendations is to achieve good mixing of refrigerant leaving indoor coil suction header for proper sensing by the TXV bulb. 1. A minimum of two 90° elbows must be installed upstream of the expansion valve bulb location....
Page 6 - To be used with approved 40RR combinations only
START-UP Before Starting Unit, check the following: 1. Compressor oil level must be visible in the compressor oil sight glass. Add oil if necessary. (See Oil Charge.) 2. Compressor hold-down bolts must be snug but not tight. 3. All internal wiring connections must be tight; all barriers and covers m...
Page 7 - To Charge System; Charge unit in cooling mode only.
To Charge System — Refer to Carrier Standard Serviee Teehniques Manual, Chapter 1 and the pro- eedures described below. Use Fig. 8 for charging any 40RR/38AQ024 combination; Fig. 9 for charging any 40RR/38AQ028 combination; and Fig. 10 for charging any 40RR/38AQ034 combination. A CAUTION Charge unit...
Page 8 - Oil Charge (Table 1
f NOTES1 All 3 outdoor fans must be operating 2 To be used with approved 40RR combinations only 3. Applies to all approved combinations. Fig. 10 — Cooling Cycle Charging Chart, 40RR/38AQ034 Oil Charge (Table 1 ) — Allow unit to run for about 20 minutes. Stop unit and check compressor oil level. Add ...
Page 9 - Fig. 11 — Fan Adjustment
SERVICE Capacity Control is by one electrically actuated unloader which controls 2 cylinders. Unloader does not require field adjustment. Compressor Motor Protection CIRCUIT BREAKER — A manual reset calibrated-trip magnetic circuit breaker protects the compressor against overcurrent. Do not bypass c...
Page 10 - Or
OPERATING SEQUENCE (Refer to wiring diagrams in 38AQ wiring booklet) Standby (OFF) Mode — During the standby or OFF mode, crankcase heater is energized. Reversing valve may Or may not be energized depending on mode of operation (heating or cooling) when thermostat is satisfied. COOLING — When thermo...
Page 11 - Fig. 12 — Typical Heat Pump Operation
Hot gas from compressor flows through the 4-way valve and is directed to the outdoor coil header At the header it is con densed and subcooled through converging circuits Refrigerant leaves the outdoor coil by way of the check valve to the liquid line The refrigerant then fiows through the filter d...
Page 12 - TROUBLESHOOTING CHART, COOLING CYCLE
Page 13 - TROUBLESHOOTING CHART. HEATING CYCLE