62-11637 7–58
P00180 CHECK SUCTION MOD VALVE
• ACTIVATION: With the unit running in Pretrip Test #10, after the microprocessor attempts to close CSMV,
the suction pressure fails to drop below 4in. Hg (-0.14 bar).
• UNIT CONTROL: Pretrip will fail and display “PRETRIP FAIL IN TEST 10”.
• 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 Notes 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 Compressor Operation
Check compressor operation. If compressor does not pass all tests, repair or replace compressor.
Refer to Section 8.8.1.
3. Check Suction Modulating Valve
a. Visually inspect CSMV. No damage to valve.
b. Inspect CSMV coil and wire connections. Refer to Section 8.9.8. Verify there is no damage to coil,
and no damage, moisture, or corrosion in connector.
c. Check CSMV operation. Refer to Section 8.9.8. Must perform correctly.
d. Check wires from CSMV to microprocessor. Verify there is no visual damage to wires. Continuity
test verifies that each wire is good.
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