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62-11637
7–60
P00191
CHECK UL2
• ACTIVATION: The pressure differential between suction and discharge pressures did not change as
expected when the Rear Unloader (UL2) was de-energized / loaded (discharge pressure should rise and
suction pressure should drop) or when it was energized / unloaded (discharge pressure should drop and
suction 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 Trans-
ducer should have a BLUE marking dot on it.
2.
Check Alarms
Check for alarm
(Check UL2). Alarm
conditions must be corrected and the alarm cleared to continue
3.
Check System Pressures
Install manifold gauge set and check and compare compressor discharge & suction pressures with
those shown in Unit Data. Refer to
for instruction on comparison.
4.
Check Rear Unloader (UL2) Operation
Check operation of Rear Unloader (UL2) See
. Unloader must load and unload properly.
P00192
CHECK SV2 CIRCUIT
• ACTIVATION: The circuit current draw is outside the normal range.
• UNIT CONTROL: Pretrip will fail in test 2 and display “PRETRIP FAIL AND COMPLETED”.
• RESET CONDITION: Auto reset if Pretrip is started again, or alarm may be manually reset via keypad or
by turning the unit off, then back on again.
CORRECTIVE ACTIONS:
1.
Check SV2 Speed Operation
Refer to procedure for alarm
. Alarm condition must be corrected and the
alarm cleared to continue.
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