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IMPORTANT NOTICE
These instructions are for the use of qualified individuals
specially trained and experienced in installation of this type
equipment and related system components.
WARNING
CAREFULLY FOLLOW ALL INSTRUCTIONS AND
WARNINGS IN THIS BOOKLET TO AVOID DAMAGE
TO THE EQUIPMENT, PERSONAL INJURY OR FIRE.
Overload Switch
The switch is connected in series with common so if the
switch opens, it will cut the power to the compressor motor.
The switch will open as a result of either or both of two
conditions that could be harmful to the compressor.
a)
High Amperes (Current)
The switch contains a heater which increases in
temperature as the current increases. The higher
temperature warps the switch and will cause it to
open before the windings reach a dangerous
temperature.
b)
High Temperature (Thermal)
The switch is clamped tightly against the
compressor housing and located close to the
windings. Therefore, as the windings reach a
higher temperature, it takes less current to cause
the switch to open.
As can be seen, the switch is always affected by a combination
of current to the compressor and winding temperature
Run Capacitors
The purpose of the run capacitors is to improve motor
efficiency during running. The run capacitors are always
connected between the start and run or main terminals of the
motor.
TABLE OF CONTENTS
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Individual Electrical Component Checkouts . . . . . . . . . . . . . . . . . . . . . 2
Service Problems and Possible Solutions . . . . . . . . . . . . . . . . . . . . . . . . 3
System Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
II. INDIVIDUAL ELECTRICAL COMPONENT
I. WARNINGS
Installation and service personnel are required by some states
to be licensed. PERSONS NOT QUALIFIED SHALL NOT
SERVICE THIS EQUIPMENT.
CHECKOUTS
Indoor Thermistor
The indoor thermistor is a freeze protection device installed in
the compressor relay circuit to prevent evaporator coil freeze-
ups. This device is a semi-conductor which has electrical
resistance that varies with temperature. The thermistor cutout
temperature is 26 degrees F. (±3 degrees), -3 degrees C (±1.7
degrees) and reset temperature is 40 degrees F. (±3 degrees),
4.4 degrees C (±1.7 degrees).
Outdoor Thermistor and Defrost Cycle
The outdoor thermistor is a freeze protection device installed
in the compressor relay circuit to prevent condenser coil
freeze-ups. This device is a semi-conductor which has
electrical resistance that varies with temperature. This device
is used in conjunction with a defrost circuit allowing the unit
to run at ambient temperatures below 3 degrees C.
During reverse cycle operation, as the outdoor coil sensor
temperature drops below -4 degrees C, a defrost cycle is
initiated. A single defrost cycle takes 60 minutes to complete.
For 57 minutes the temperature of the outdoor coil sensor is
monitored. (If at any point after the first 10 minutes of the
cycle has passed the temperature rises above 2 degrees C, the
cycle is terminated and normal reverse cycle operation
resumes.)
After 57 minutes, the indoor blower is shut down and the
reversing valve is un-energized shifting the unit back into A/C
mode for 3 minutes. This will heat the outdoor coil and melt
frost or ice that has formed on the coil. After 3 minutes, the
reversing valve is re-energized, putting the unit back in
reverse cycle operation. At this point a 15 second delay on
blower start-up will occur to avoid any cold air being blown
into the coach. The 60 minute cycle will restart unless the unit
satisfies or the temperature of the outdoor coil has risen above
2 degrees C.
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