SERVICE MANUAL FOR ROOF TOP AIR CONDITIONERS
PREFACE !WARNING – SHOCK HAZARD! This service manual is primarily intended for the use of qualified individuals specially trained and experienced in the service of this type of equipment and related system components. Installation and service personnel are required by some states, counties or cities to be licensed. Persons not qualified shall not attempt to service this equipment or interpret this service manual.
TABLE OF CONTENTS I. Basic Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 II. Air Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 III. Electrical Power Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 IV. Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BASIC COMPONENTS AND THEIR FUNCTIONS REFRIGERATION SYSTEM DIAGRAM 4
I. BASIC COMPONENTS Compressor Metering Device The compressor is called a hermetic compressor which means that it is completely sealed (welded together). It is, therefore, not internally field serviceable. Inside the compressor housing is an electric motor which drives the compressor. The refrigerant enters the cap tube from the condenser as a warm high pressure liquid. As the refrigerant flows through the small diameter cap tube, the pressure drops rather rapidly.
2. If there is a reading of 0 between any two leads, the motor is shorted and is no good. If there is a reading of infinity (no meter reading at all) between any two leads, the winding is open and the motor is no good. Note: Filters The filters should always be in place when the system is running. More important than their purpose of cleaning the air in the living space is the protection the filters give the evaporator coil.
Power Supply – Generated by on-board motor generator 115 volts (domestic USA) between the black and white leads, but there will be 0 volts between either lead and ground. 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. WARNING There are, however, some motor generators on which both the current carrying leads are insulated from the ground.
VI. FREE DELIVERY CEILING ASSEMBLIES Selector Switch – Free Delivery Ceiling Assemblies the electric heater when the selector switch is in the heating position. The thermostat is actuated by sensing the temperature of the return air through the vent where the bulb is located. Terminal continuity should make and break if ambient air temperature is between 65 and 90 degrees F. The selector switch is mounted on the left side of the interior ceiling assembly.
VII. SERVICE PROBLEMS AND THEIR POSSIBLE SOLUTIONS SERVICE PROBLEMS WITH AIR CONDITIONER AND FREE DELIVERY CEILING ASSEMBLIES The following list of service problems covers only some of the more common problems which may occur and lists only the more probable causes. In many instances, it will be necessary to use the wiring diagram in this manual to check out the electrical circuits step by step, starting at the power source.
WIRING DIAGRAMS 9330X713, 9330X714 COOL ONLY CEILING ASSEMBLIES 9330X715, 9330X916 HEAT/COOL CEILING ASSEMBLIES 10
7000 SERIES ROOF MOUNT AIR CONDITIONERS 11
8000 SERIES ROOF MOUNT AIR CONDITIONERS 9000 SERIES ROOF MOUNT AIR CONDITIONER 12
Airxcel, Inc. RV Products Division P.O.
