April 1998
43
RS5290000 Rev. 0
Defrost System–Nonelectronic Models
Every 6 or 8 hours of compressor run time defrost
timer activates radiant electric defrost heater
suspended from evaporator. After 33 minutes of
defrost cycle time, timer restores circuit to
compressor.
Defrost terminator (thermostat) and fusible link are
wired in series with defrost heater and evaporator fan
motor. Terminator opens and breaks circuit when
preset high temperature is reached. After defrost
thermostat opens, thermostat remains open until end
of defrost cycle until cooling cycle starts and
terminator senses present low temperature and
closes.
Fusible link opens if terminator fails open and preset
high temperature is reached.
Defrost heater is suspended on left side of evaporator
coil and across bottom to keep defrost drain free
flowing during defrost. Defrost water is caught in
trough under evaporator coil and flows through drain
hole in liner and drain tubing into drain pan. Heated air
circulated by condenser fan over pan evaporates
water.
Defrost System–Electronic Models
See “Electronic Functional Description.”
Product Design
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit and discharge
capacitor through a 10,000 ohm resistor before attempting to service, unless test procedures require power to be
connected. Ensure all earth wires are connected before certifying unit as repaired and/or operational.
!
WARNING