GE Monogram BIS42CKB/C Technician Manual page 8

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1989 REFRIGERATORS
Defrost Drain System
1. Drain Tube and Auxilary con-
denser
Defrost water from the drain
trough, under the evaporator,
flows through a tube that extends
to the defrost water pan at the
right side of the refrigeration
unit. In addition to warm air from
the condenser fan flowing across
the pan, the auxiliary condenser,
positioned under the bottom of the
pan, helps evaporate the accum-
ulated defrost water.
For access to the defrost heater
and the drain trough heater, the
evaporator must be completely
removed. There is a piece of
styrofoam between the evaporator
coils and the housing on the right
side. This piece of styrofoam may
fall down when removing the
evaporator and must be replaced
when reinstalling.
2. Defrost Heater
The defrost heater is positioned
into the right side and rear of
the evaporator and held securely
by brackets at each end.
3. Drain Trough Heater
The drain trough heater is
positioned on the bottom of the
drain trough. The heater is
imbedded in an aluminum sheet, and
the sheet adheres to the bottom of
the trough. The heater can be
removed by peeling the aluminum
sheet off the drain trough.
4. Defrost Thermostat and Fan
Delay Thermostat
The defrost thermostat and the fan
delay thermostat are mounted, one
above the other, to the front of
the evaporator. The defrost fan
delay is connected in series with
the evaporator fan motor. The
thermostat closes at 25 degrees
and opens at 45 degrees. The
thermostat delays the fan for
about 10 minutes after a defrost
to allow the evaporator to pull
down sufficiently. These thermo-
stats must be removed from the
evaporator when removing the evap-
orator from the housing.
Page 7
MONOGRAM REFRIGERATOR
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EVAPORATOR
HOUSING
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DRAIN
TROUGH
DRAIN TROUGH
HEATER