Carrier VECTOR 1550 Series Operation & Service Manual page 129

Alarm
Steps
NO.
18 LOW REFRIGERANT PRESSURE (Continued)
7 Check CSMV
a. Check compressor suction modu-
lation valve.
8 Check Evaporator Section
a. Check evaporator section, return
air bulkhead, air chute, cleanliness
of evap. coil and airflow.
9 Visually Inspect Unit
a. Visually inspect unit for damage to
the liquid line causing a restriction
or any signs of temperature drop at
the drier.
Check Evaporator Expansion Valve (EVXV)
10
a. Check operation of valve.
ALARM / CAUSE CORRECTIVE ACTION
Refer to procedure "How To Check CSMV", Section
8.6.7.
Refer to Section 9.4.10
All tubing from the receiver to the evaporator section is
in good condition
There is no temperature drop at the drier or anywhere
on the liquid line
Refer to Section 8.6.8
7-13
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