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 TM5-4110-234-14
TO 40R7-5-7-1
a.
Removal.
(1) Disconnect power.
(2)
See figure 4-12 and remove the evaporator air housing and screen.
(3)
Loosen screw and nut holding the clamp and slip the remote sensing bulb out of the clamp.
(4)
Remove the tube clamps and carefully cut the plastic tie wraps that hold the capillary line in place.
(5) Carefully thread the capillary line and bulb through the heat shield wall. Take care not to damage the
other capillary lines.
(6)
Remove the three attaching screws and nuts and pull the thermometer from the panel.
b. Calibration. Immerse the remote bulb in a container of cracked ice for several minutes. The dial should
indicate 32F (0C). If it does not, remove the crystal and correct the dial indication by means of the calibration adjustment
on the face of the dial. If the gage can't be calibrated, it must be replaced.
c.
Installation.
(1) Thread the bulb and capillary through the panel hole and mount the thermometer using three screws and
nuts.
(2)
Taking care not to damage the other capillary lines thread the bulb and capillary through the hole in the
heat shield wall.
(3) Reclamp the capillary line in its original clamps. Install new plastic tie wraps or use electricians tape to
secure the capillary lines together.
(4)
Insert the bulb in the mounting clamp and tighten the retaining screw and nut.
(5)
Check to see that grommets are in place at heat shield wall.
(6)
(7)
Close access doors and connect power.
4-30.
This gage indicates the pressure at the input to the compressor. It is called a compound gage because its scale
graduated for pressures above atmospheric pressure in psig and for pressures below atmospheric pressure (vacuum) in
inches of mercury.
a.
Removal.
(1)
Disconnect power.
(2)
Open doors to have access to the left rear of the control panel and the compressor suction valve.
(3) Remove the protective cap from the suction valve stem.
Use a refrigerant valve wrench or other
suitable wrench and totally backseat (turn fully counterclockwise) the valve.
(4) Carefully and slowly loosen the flare nut from the coupling on the back of the gage. Use two wrenches,
one to hold the coupling and the other to loosen the flare nut. Allow the small amount of refrigerant that is in the capillary
to escape. Should refrigerant continue to leak out after a few seconds, tighten the flare nut and check to see that the
compressor valve has been properly backseated.
(5)
Remove the flare nut from the coupling and remove the coupling from the gage.
4-42
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