Service manual

62-11389
7−17
Alarm
NO.
Steps Alarm/Cause Corrective Action
22 LOW SUCTION SUPERHEAT - Continued
5
(Cont’d)
Check Compressor Suction Temperature (CST) and Evaporator Outlet Temperature
(EVOT) sensors - Continued.
e. Inspect EVOT & connector. No damage to sensor.
No damage, moisture, or corrosion in connector.
f. Check EVOT resistance.
(See Note 3 page Note 3.)
10,000 Ohms @ 77°F (25°C.) Refer to Table 8−5 for
complete table of temperatures and resistance val-
ues.
g. Check voltage at harness connec-
tion to EVOT.
Must be 2.5 $0.5 VDC. This verifies microprocessor
output and wiring connections to sensor.
h. Verify accuracy of EVOT using in-
frared or other accurate temperat-
ure testing tool.
EVOT reading must be within $3°F (1.7°C) of test
temperature tool reading.
6 Check EVOP and CSP
a. Check operation of both trans-
ducers
Refer to Section 8.8.8.
b. Check Schrader valve fitting under
each transducer
Must not be physically damaged, depressor must
fully open valve to allow pressure to transducer
7 Check EVXV
Check operation of EVXV Refer to Section 8.8.6.
8 Check heat exchanger
With the unit running in high speed
cool, check temperature of suction
line inlet and outlet at the heat ex-
changer.
Inlet line (toward evaporator coil) must be colder than
outline (toward compressor).