Section 5 – SR-2 Diagnostics
86 CHECK DISCHARGE PRESSURE SENSOR
Page 1 of 1
Alarm Type
Check Alarm
Associated Alarm
Codes
Circuit Description
The 3-wire sensor is supplied with +5 Vdc and ground from the microprocessor. The sensor is located above the 3
way valve. The wiring is located in the Sensor Harness via the DPP-01, DPN-01 and DPI-01 circuits.
How Alarm is Set
1. The unit is not running and the sensor reading is greater than 500 PSIG for 10 seconds.
2. The unit is running and the sensor reading is less than +25 PSIG for 10 seconds. This condition does not
apply if the ambient temperature is less than 0
°
F (-18
°
C) or if an ETV check is active.
3. The discharge pressure did not rise or fall during an ETV test.
How Alarm is Cleared
This alarm is cleared manually. Clearing the code will cause the unit to shut down and restart to check the
transducer for proper operation by performing a ETV check.
Considerations
Alarm Code 86 replaces Alarm Code 109 that was used on
µ
P-VI units.
Diagnostic Procedure
1. Check the discharge pressure display using the Gauge Menu.
2. If the discharge pressure is not displayed by the microprocessor, unplug the transducer and check for +5
Vdc between DPP-01 and DPN-01. If 5 volts is not present check the microprocessor using Service
Procedure A01A.
3. Connect refrigeration gauges to verify that the sensor is not displaying the correct pressure. Replace the
sensor.
4. Check the harness wires DPP-01, DPN-01 and DP-01 for continuity using an ohmmeter.
5-66
02 February 2005
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