Suction Pressure Sensor
refrigeration
Description
Suction pressure sensor is out of range, and the unit gives alarm only and forces STANDARD mode.
Activation Conditions
Suction pressure sensor is out of range. If Economizer pressure < or = (Suction pressure - 10) for 10 seconds and suction pressure is > than 40 psig and < than 60 psig with the compressor running.
Unit Behavior
Engine and Electric: Alarm only. Economizer forced to STANDARD mode when alarm is active.
Reset Conditions
Auto reset when Suction Pressure Sensor is in range 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 System Pressures a. Check Unit Data. Refer to Section 3.15. Compare the pressure readings for the ECOP, the CSP and the CDP. The ECOP should read between the CSP and the CDP. Refer to Section 8.8.11 for instruction on comparison. If pressures are in normal range, proceed to next step. b. Place the Unit in Service mode. Refer to Section 5.2.5. After the unit has equalized, compare the pressure readings for the ECOP, the CSP and the CDP. The ECOP the CSP and the CDP should all read within 5 PSI, if not it indicates a failed sensor. Refer to Section 8.8.11 for instruction on comparison. 2. Check Pressure Sensor - Inspect sensor and connectors (1-3MSM-9, 21, and 32). Verify there is no damage to sensor, and no damage, moisture, or corrosion in connectors.