7−32
62-11389
Alarm
NO.
Steps Alarm/Cause Corrective Action
39 CHECK ENGINE RPM - Continued
7 Check Low Speed Engine RPM
a. Check actual engine RPM using
hand held tachometer.
Refer to Table 2-1.
b. Compare actual RPM with those
shown on display.
Both readings within ± 50 RPM.
8 Force High Speed Operation
a. Place unit in continuous run and
adjust set point to at least 15 degrees
away from refrigerated compartment
temperature, and a temperature
greater than 20°F (5.6°C) If the unit
does not immediately go into High
Speed, set the AIRFLOW Functional
Parameter to HIGH.
The microprocessor will call for High Speed opera-
tion.
b. Check operation of Speed Relay
LED.
LED 27 must be ON. (If LED 27 is not on, the micro-
processor is not calling for high speed operation.
Check Speed Overrides in Section 4.8.3 for more
information.)
9 Check high speed engine RPM
a. Check actual engine RPM using
hand held tachometer.
Refer to Table 2-1.
b. Compare actual RPM with those
shown on display.
Both readings within ± 50 RPM.
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