SERVICE MANUAL for MODEL AirV Rooftop Air Conditioning Systems

1.6 AirV SYSTEM COMPONENT SPECIFI-CATIONS1.6.1 Refrigerant ChargeStandard -- High Capacity -- Heat PumpR--22 -- 15.9 OuncesLow Profile (All)R--22 -- 16.9 Ounces1.6.2 Compressor - 115 Volts, 60 Cycles, 1 PhaseNOTEAirV Compressor mounting bolts must betorqued15/17 ft./lbs.1. Locked Rotor Amps - Standard - HighCapacity - Heat Pump60.0 AMPS2. Locked Rotor Amps - Low ProfileHigh Capacity59.0 AMPS3. Fully Loaded Amps - StandardCooling -- Approximate 12.8 AMPSHeating -- N/A4. Fully Loaded Amps - High CapacityCooling -- Approx. 14.1 AMPSHeating -- Approx. 11 AMPS5. Fully Loaded Amps - Low ProfileCooling -- Approx. 13.4 AMPSHeating -- Approx. 13.8 AMPS6. Fully Loaded Amps - Heat PumpCooling -- Approx. 12.9 AMPSHeating -- Approx. 13.8 AMPS1.6.3 Compressor - 220 Volts, 50 Cycles, 1 Phase1. Locked Rotor Amps23.6 AMPS1.6.4 Thermostat Range (All Free Blow Units)61° F(16° C) to 89° F(32° C)1.6.5 Return Air Sensor (Thermistor)The Return--Air--Sensor (Thermistor) is part of the PCBMain Assembly. The sensor has a yellow coating andprotrudes about 3/16 inch thru the ceiling panel wheninstalled. Refer to Table 3--1 for resistance table.1.6.6 Heat Pump Sensors (Thermistors)The Heat Pump systems have a (ODA) outdoor airthermistor and a (ODC) outdoor coil thermistor, bothlocated in the upper unit and a (IDC) indoor coilthermistor located in the ceiling unit. Resistance valuesfor these thermistors can be found in Table 3--2.1.7 START -UPRefer to operating instructions in Owners Guide (seeTable 1--3) packaged with the vehicle system.1.8 Dry Mode FunctionThis operation effectively eliminates moisture byoperating the compressor and fan motor intermittently,so that the room temperature is maintained at settemperature. Compressor will be “on” for 5 minutes,then “off” for 5 minutes. System fan motor will operateon low speed.NOTEUnit determines Dry Mode by sensing Room Temperatureevery 5 minutes (3 minute minimum operationof compressor is not applied).DISCHARGELIQUIDSUCTIONEVAPORATORCAPILLARYTUBEACCUMULATORSTRAINERCOMPRESSORCONDENSERFigure 1 -13 Refrigerant Flow Schematic (Standard System)1.9 REFRIGERANT CYCLE -STANDARD SYSTEMThe cooling cycle is energized when the thermostat,located on the ceiling unit, calls for cooling. The maincomponents of the system are the compressor,air-cooled condenser coil, strainer, capillary tube,evaporator coil and accumulator.The compressor raises the pressure and thetemperature of the refrigerant and forces it through thedischarge line into the condenser coil. (SeeFigure 1--13.)The condenser fan circulates surrounding air (which isat a temperature lower than the refrigerant) over theoutside of the coil tubes. Heat transfer is established10/091--15T--298