Carrier 09AZ091-182 Installation, Start-Up And Service Instructions Manual page 14

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