Field Troubleshooting - True GDM Series Technical & Service Manual

FIELD TROUBLESHOOTING

5. Cabinet Temperature Control
A. Remove the two screws on the right
side of the evaporator housing that
holds the control mounting plate.
Reach behind the evaporator housing
on the control side of the cabinet and
pull the control bulb out of the recepta-
cle in the roof of the cabinet.
Disconnect the wires from the control.
Check control for continuity, replace if
defective.
6. Evaporator Fan Motor
A. Remove fan blade guard from the evap-
orator housing. Remove the blade.
Remove screws holding the evaporator
motor. Disconnect wires by removing
wire nuts.
7. C.R.O. Valve
A. Remove the refrigerant from the system
to an equalized 0 pounds pressure.
Remove securing strap holding the
valve to the condensing unit base.
Replace the valve. Evacuate the sys-
tem to 100 microns and recharge the
system.
8. Fan Door Switch (and lights on "T"
Models)
A. Pull switch downward out of the square
hole overriding the holding tabs.
Remove wires and replace the switch.
FREEZER PERIMETER HEATER WIRE
REPLACEMENT
1. Disconnect the power supply, unload
contents of cabinet and lay cabinet on
its back.
2. Remove the lower louvered grill.
Remove the stainless steel skirt around
the louvered grill.
3. Remove the sign or the louver section
above the door(s).
4. Remove hinges and door(s).
5. Drill out pop rivet on right top corner of
plastic and stainless steel mullion trim.
Remove horizontal top stainless steel
strip by sliding it to the right on the
tracks in the plastic. Be sure to raise
the corner of the plastic trim where the
pop rivet was removed so that the stain-
less trim slides beneath it. Drill out the
two pop rivets in the top plastic trim
which was hidden by the horizontal
piece of stainless trim.
6. Remove left and right vertical stainless
steel trim pieces by sliding them out of
the plastic trim. Be sure to raise the top
horizontal plastic trim piece so that the
stainless trim passes underneath it
toward the top of the cabinet.
110
7. Drill out the pop rivet that was hidden
by the stainless steel trim in the lower
right corner of the vertical plastic
piece. Raise this corner of the vertical
plastic piece so that the lower vertical
stainless trim slides beneath it for
removal.
8. Remove three (3) screws on each side
of the center mullion and raise mullion
out of the cabinet and slide the stainless
trim past the top of the cabinet.
9. Disconnect heater wires in the junction
box, Remove heater wire loop by
unhooking at the corners where it is
retained by the plastic trim pieces.
10. Replace inoperative heater wire loop,
being sure to hook under the corners of
the plastic trim as observed during dis-
assembly.
11. Reverse assembly sequence to replace
trim. Use the four (4) small sheet metal
screws furnished with the heater wire
in the same sequence as the pop rivets
were removed.
12. Attach the heater wires to the power
supply in the junction box. Replace all
other assemblies in reverse sequence in
which they were removed.