6-16
Compressor Temperature Sensor Replacement
Refrigeration System Diagnosis and Service
CSR-20 & CSR-40, September 1999
5.
Pressurize the refrigeration system and check for leaks
(see “Refrigerant Leak Test Procedure” in this chapter).
6.
If no leaks are found, recover the refrigerant used for the
leak test (see “Refrigerant Recovery” in this chapter).
7.
Evacuate the system (see “Evacuation and Cleanup of the
Refrigeration System” in this chapter).
8.
Connect three-phase electric power to the compressor.
9.
Recharge the unit with R-404A (see “Refrigerant Charge” in
this chapter). Then perform a controller Pretrip Test to
verify system operation.
Compressor Discharge Temperature Sensor
Replacement
Removal
1.
Disconnect the unit from the three-phase power supply.
2.
Open control box door. Disconnect 2-pin, white molded
connector of temperature sensor leads.
3.
Remove sensor wires from main harness and control box.
4.
Use a razor knife to cut the black RTV sealant between
the compressor body and molded sensor cap.
5.
Remove sensor assembly from compressor.
6.
Remove all RTV sealant from the compressor body.
Installation
1.
Apply a heat conducting grease, P/N 203-454, on the
sensing element.
2.
Apply a 6 mm (0.25 in.) bead of black RTV silicone
around the underside of the sensor cap (see sensor illustra-
tion below).
3.
Insert sensor into compressor body.
4.
Apply another bead of black RTV sealant around the outer
edge of the sensor cap. Smooth and spread the sealant
bead evenly around the edge of the sensor cap with a
damp cloth.
5.
Route sensor wires into control box. Connect new sensor
leads (2-pin, white molded connector).
CAUTION: Do NOT splice or damage sensor
leads or compressor damage will occur.
Removing Compressor Discharge Temperature
Sensor
1. Loosen sensor cap from compressor body by cutting
through RTV sealant with razor knife. Cut complete-
ly around the cap.
Preparing Compressor Discharge Temperature
Sensor for Installation
1. Sensor Cap
2. O-ring
3. Apply heat conductive grease on this area of sensor
4. Apply a 6 mm (0.25 in.) bead of RTV silicone around
top of the sensor before inserting sensor into com-
pressor pocket.
5. Route sensor leads into control box.
CAUTION: Do NOT splice or damage sensor
leads or compressor damage will occur.
