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GE Monogram BIS42CKB/C Technician Manual page 8

1989 refrigerators

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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
/
EVAPORATOR
HOUSING
l
DRAIN
TROUGH
DRAIN TROUGH
HEATER

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