7–63
62-11637
P00198
LOW DISCHARGE PRESSURE
• ACTIVATION: In Pretrip heat, the compressor discharge pressure did not rise to normal. (“Normal” dis-
charge pressure for systems operating in Pretrip heat can be estimated by adding 80 psig (5.5 bars) toe
the saturation temperature of the air entering the condenser (ATS reading).
• UNIT CONTROL: Pretrip will abort and “PRETRIP FAILED IN TEST 4” will be displayed in MessageCenter.
• 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 installed in each position. Mechanical connections are the same. The
CDT should have a red dot on it while the CST has a blue dot.
2.
Check for Alarms
a. Check for alarm
00121 CHECK AMBIENT AIR SENSOR
P00158 CHECK AMBIENT AIR SENSOR
Alarm conditions must be corrected and the alarm cleared to continue.
b. Check Ambient Sensor reading. Must be within ±10°F (±5.5°C) of actual temperature.
3.
Check System Pressures
a. Install manifold gauge set and check and compare compressor discharge & suction pressures with
those shown in Unit Data. Refer to
for instruction on comparison.
b. Check transducer operation. Refer to
4.
Check Refrigerant Charge
Refer to
5.
Check SV1
Refer to SV1 Checkout Procedure in
6.
Check Compressor
a. Check the operation of the high side of the compressor by covering the condenser inlet air. Discharge
pressure must rise a minimum of 50 to 100 psig (3.4 to 6.9 bars).
b. Remove compressor heads & inspect condition of cylinder suction valves, cylinder discharge valves
and gaskets. Must be in good condition.
Summary of Contents for Transicold X4 7300
Page 21: ...62 11637 1 6 1 3 SAFETY DECALS ...
Page 22: ...1 7 62 11637 62 03958 ...
Page 23: ...62 11637 1 8 ...
Page 24: ...1 9 62 11637 ...
Page 119: ...62 11637 SECTION 6 MESSAGECENTER PARAGRAPH NUMBER Page 6 1 MESSAGECENTER MESSAGES 6 1 ...
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