Carrier VECTOR 6500 Operation & Service Manual page 165

Alarm
Steps
NO.
39 CHECK ENGINE RPM - Continued
7 Check Low Speed Engine RPM
a. Check actual engine RPM using
hand held tachometer.
b. Compare actual RPM with those
shown on display.
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,
greater than 20°F (5.6°C) If the unit
does not immediately go into High
Speed, set the AIRFLOW Functional
Parameter to HIGH.
b. Check operation of Speed Relay
LED.
9 Check high speed engine RPM
a. Check actual engine RPM using
hand held tachometer.
b. Compare actual RPM with those
shown on display.
62-11389
Alarm/Cause
and a temperature
7−32
Corrective Action
Refer to Table 2-1.
Both readings within ± 50 RPM.
The microprocessor will call for High Speed opera-
tion.
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.)
Refer to Table 2-1.
Both readings within ± 50 RPM.