Replacing Temperature Controls In Gdm-7, Gdm-10, & Gdm-12 Models - True GDM Series Technical & Service Manual

INSTALLATION INSTRUCTION
Replacing Temperature Controls in GDM-7, GDM-10, and GDM-12 Models
F
r
o
n
t
o
f
C
o
o
l
e
r
___________ STEP 1 ___________
Unplug Cooler and turn temperature
control to "off" (0˚) position.
___________ STEP 2 ___________
Pull off the black control knob from
the control.
___________ STEP 3 ___________
Remove the mounting plate from the
evaporator housing.
___________ STEP 4 ___________
Remove the temperature control from
the plate and disconnect the 2 wires.
___________ STEP 5 ___________
Remove the lamp from the front of the
cooler and remove the front panel.
Sleeve Extension
Temperature
Evaporator
Control
___________ STEP 6 ___________
Reach in to the side of the evaporator
coil and remove the permagum from
around the control bulb. Then remove
the old thermostat control bulb from
the sleeve completely.
___________ STEP 7 ___________
Insert the new thermostat control bulb
into the new copper sleeve exten-
sion until about 1/2 inch protrudes
from the swaged end. Using a low
temperature lubricant on the control
bulb is advisable.
___________ STEP 8 ___________
Using the protruding end of the con-
trol bulb as a guide, insert it into the
copper sleeve (elbow) in the rear of
the evaporator. Then push the sleeve
extension over the end of the elbow to
lock the two
tubes together.
50
New Copper
Permagum
___________ STEP 9 ___________
Gently push the control bulb through
the joined sleeves in 1-2 inch incre-
ments until it reaches the end inside
the evaporator, taking care not to kink
the line.
___________ STEP 10 ___________
Seal both ends of the new control
sleeve with permagum to keep mois-
ture out.
___________ STEP 11 ___________
Remove the mounting plate from the
evaporator housing.Connect the 2
wires to the new control, the control to
the mounting plate, the plate to the
cooler, and replace the control knob.
___________ STEP 12 ___________
Turn the control knob to the #5 set-
ting.
___________ STEP 13 ___________
Reassemble front of cooler and plug it
in.
Standard
Copper
Sleeve