THINK SAFETY 1. Power Supply – from Commercial Utility 1) Wire Size The power supply to the air conditioner must come through a circuit breaker or time delay fuse. The power supply must be 20 amperes and 12 AWG wire minimum. Any size larger wire at any time may be used and should be used if the length of the wire is over 32 feet. 2) Color Code The electric power from the electric service panel should be delivered through a 3 conductor cable and the Service Technician should check to be sure the color code is correct. The electrician probably installed the cable with the colors according to code, but don’t bet your life on it. a) The wire with black insulation is the hot wire and there should be 115 volts (domestic USA) between it and either of the other wires. All switches, fuses, circuit breakers, disconnects, etc. should be in this line. b) The wire with the white insulation is the neutral. There should be 115 volts (domestic USA) between the neutral and the hot (black) wire, but there should be 0 volts between the neutral and the ground (the green wire or the frame of the air conditioner). There must be no switches, fuses, disconnects, etc. of any kind in the neutral wire. c) The third wire may be covered with green insulation or it may be a bare metal wire. It is the ground wire. There must be 115 volts (domestic USA) between this wire and the hot (black) wire and 0 volts between it and the neutral (white) wire. The ground wire must be securely fastened to the air conditioner cabinet. A green headed screw is provided for this purpose. 3) Voltage The voltage (electrical pressure) at the unit should be 115 volts (domestic USA) and all electrical components will perform best at the correct voltage. However, the voltage will vary and the air conditioning system will perform satisfactorily within plus or minus 10% of the rated (115) voltage (domestic USA). Therefore, the voltage has to be between 103.5 volts and 126.5 volts. 2. Power Supply – Generated By On-board Motor Generator If the power supply for the recreational vehicle is supplied by an on-board motor generator, its wiring may be identical to the commercial power described above. There are, however, some motor generators on which both the current carrying leads are insulated from the ground. That is to say; there is no grounded neutral, so there will be 115 volts (domestic USA) between the black and white leads, but there will be 0 volts between either lead and ground. WARNING: The service technician must keep in mind when checking to make sure that the power is turned off – check only between the hot (black) lead and the neutral (white) lead. The black lead could still be hot even though there is 0 volts between it and ground. 3. Compressor Motor The compressor motor is located inside the hermetic compressor housing and is therefore, not accessible for service or visual observation in the field. However, the motor winding condition can be analyzed by using an ohm meter. Be sure to remove all the leads from the compressor terminals before making this check. 1. If the resistance between any two terminals is 0 ohms, the motor windings are shorted. 2. If the resistance between any terminal and the compressor housing is anything but infinity, the winding is grounded. 4. Overload Switch Mounted on the outside of the compressor housing is a two terminal Overload switch. The switch is connected in series with the common terminal. If the switch opens, it will cut the power to the compressor motor. The switch will open as the…

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