High Suction Pressure
refrigeration
Description
During Cool Pretrip Test #4, suction pressure is higher than normal, and the unit gives an alarm only.
Activation Conditions
This alarm is generated during Test #4 in Cool Pretrip, suction pressure is higher than normal.
Unit Behavior
Alarm Only
Reset Conditions
Auto reset if Pretrip is started again, or Alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check Wiring to CDP and CSP a. Verify that correct wires are connected to each transducer. Plugs to transducers are the same. The correct 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 Alarms: Check for P00181 Check SV4 Valve. 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 and suction pressures with those shown in Unit Data. Refer to Section 1.9.12 for instruction on comparison. b. Check transducer operation Refer to Section 1.9.12. 4. Check Low Side Operating Conditions: Refer to procedure for alarm 00027 High Suction Pressure. Alarm condition must be corrected and the alarm cleared to continue. 5.