Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 530-921
Printed in U.S.A.
Form 09AZ-1SI
Pg 14
612 2-01
Replaces: New
Copyright 2001 Carrier Corporation
Table 5 — Troubleshooting
PROBLEM
POTENTIAL CAUSE
SOLUTION
Unit is tripping on high-pressure
switch or high discharge pressure is
noted.
1. Fan is not delivering adequate condenser
air.
2. Dirty condenser coil.
3. Head pressure controls not operating
correctly.
1. Check condition of condenser fan and mo-
tor. Check position of fan blade on motor
shaft.
2. Check and clean coil as required.
3. Check operation of head pressure controls.
Unit is tripping on low-pressure
switch or low suction pressure is
noted.
Head pressure controls not installed or not
operating correctly.
1. Check head pressure control, and be
sure it is operating properly. Install if not
provided.
2. Check wind baffles, apply if required.
3. Check operation of fan-cycling control on
two-fan units.
Unit trips on low pressure at start-up
with low outdoor temperatures.
1. Winterstart kit not installed or not working
correctly.
2. Fan cycling control for two-fan units is not
installed or not operating correctly.
1. Check operation of winterstart control. In-
stall if not provided.
2. Check operation of fan cycling control.
Unit is low on capacity or losing
capacity.
1. Dirty coil.
2. Airflow is not adequate.
1. Check and clean coil as required.
2. Check condition of condenser fan and mo-
tor. Check position of fan blade on motor
shaft.
Condenser is noisy.
1. Fan blade or motor is out of alignment.
2. Proper vibration isolation has not been
applied.
1. Check fan blades for bent or damaged
blades. Check blade position on the shaft.
2. Isolate unit properly.
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