7–57
62-11637
P00178
CHECK UL1
• ACTIVATION: The pressure differential between suction and discharge pressures did not change as
expected when the Front Unloader (UL1) was de-energized / loaded (discharge pressure should rise and
suction pressure should drop) or when it was energized / unloaded (discharge pressure should drop and suc-
tion pressure should rise.
• UNIT CONTROL: Pretrip will fail in test 5 and display “PRETRIP FAIL AND COMPLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again or alarm may be manually reset using the dis-
play mounted keys or by turning the unit off then back on again.
NOTE: Follow the steps below until a problem is found. Once a repair or correction has been made, clear the
alarm(s). (Refer to Note 1 in
Section, page 7-2.) Operate the unit through the appropriate modes to see if
any active alarm occurs. Continue with the steps below as necessary.
CORRECTIVE ACTIONS:
1.
Check Wiring to CDP & CSP
a. Verify that correct wires are connected to each transducer. Plugs to transducers are the same. The cor-
rect wire plug must be connected to the proper transducer. The CDP connector is identified with a red
tape band while the CSP connector is identified with a blue band.
b. Verify that correct transducer is being used in each position. Mechanical connections to transducers
are the same. The discharge transducer should have a RED marking dot on it. The suction transducer
should have a BLUE marking dot on it.
2.
Check for Alarms
Check for alarm
. Alarm conditions
must be corrected and the alarm cleared to continue.
3.
Check System Pressures
a. Install manifold gauge set and check and compare compressor discharge & suction pressures with
those shown in Unit Data. Suction and Evaporator Outlet pressures must be above 3 psig (0.2 bar).
Refer to
for instruction on comparison.
b. Check transducer operation. Refer to
4.
Check Front Unloader (UL1) Operation
Check operation of Front Unloader (UL1). See
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