7–13 62-11785
00027 HIGH SUCTION PRESSURE
• ACTIVATION: The refrigeration system is running and the suction pressure has been greater than 98 psig
(6.7 bar) for more than 10 minutes.
• UNIT CONTROL: Alarm only or (if configured for shutdown) refrigeration system shutdown and alarm
with PSCON still energized.
• RESET CONDITION: Auto reset when suction pressure is less than 75 psig (5.1 bar) for 5 minutes and
configured for Alarm Only, or Auto Reset after 15 minutes if configured as a Shutdown Alarm or, alarm
may be manually reset via keypad 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, the active
alarm should clear itself (refer to reset condition above). 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 Refrigerant Charge - Refer to Section 8.5.2. Charge must be correct.
2. Perform Pretrip Check - Clear Active Alarm list, then run Pretrip & check for any new alarms. Any active
alarms must be corrected and cleared before proceeding.
3. Check System Pressures - Install manifold gauge set and check and compare compressor discharge &
suction pressures with those shown in Unit Data. Suction pressure must be above 3 psig (0.2 bar) and
should be in the normal range for ambient & refrigerated compartment conditions. Refer to Section
8.7.11.
4. Check Compressor
a. Check compressor for excessive vibration or noise. Replace compressor.
b. Cover condenser and build-up discharge pressure. Must be able to raise pressure to 400 psig
(27.2 bar).
5. Check Transducer Wiring, Refer to Section 8.7.11
a. Inspect transducer & connector pins & terminals. (See wiring schematic Section 10.3.) Verify
there is no physical damage to sensor. Verify there is no damaged or corroded pins in plug.
b. Check for voltage at the transducer plug between pins A (+) and B (ground). Voltage should be
approximately 12 VDC. If OK, go to next step. If not, continue with this step.
c. Reconnect the transducer plug. Check for voltage between 1MP-29 and ground. Voltage should be
greater than 0.24 VDC and less than 5 VDC.
6. Check Expansion Valve (EVXV)
a. Visually inspect valve. Check coil is seated properly.
b. Check valve. Refer to Section 8.7.8.
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