Carrier VECTOR 6500 Operation & Service Manual page 150

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