Carrier X4 7300 - P00202 High Side Leak; P00203 Chk Discharge Check Valve

7–65 62-11637
P00202 HIGH SIDE LEAK
• ACTIVATION: Refrigerant pressure is leaking past one of the components in the high pressure side of the
refrigeration system into the low pressure side.
• UNIT CONTROL: Alarm Only
• 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 System Pressures
Install manifold gauge set and check and compare compressor discharge & suction pressures with
those shown in Unit Data. Refer to Section 8.9.12 for instruction on comparison.
2. Check Compressor
a. Perform Pump-Down Test. Refer to Section 8.8.1. Must hold a vacuum and not equalize in a short
period of time.
b. Cover condenser and build-up discharge pressure. Must be able to raise pressure to 400 psig (27.2 bar).
c. Disassemble and inspect compressor valve plates, cylinder suction valves, cylinder discharge valves
and pistons, etc. Must be intact, clean, and in good working order.
P00203 CHK DISCHARGE CHECK VALVE
• ACTIVATION: Refrigerant is leaking backwards through the Discharge Check Valve.
• UNIT CONTROL: Alarm Only
• 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. Pump Down Low Side
Perform pump down and check valve for leakage. Refer to Section 8.9.10.
2. Disassemble and Check Condition
Refer to Section 8.9.10.