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PA4Z: Owner's Information Manual
Your servicing dealer may offer an economical service contract that
covers seasonal inspections. Ask for further details.
Complete service instructions can be found in the unit Installation,
Start-up and Service Instructions.
Warranty Certificate
Your unit has a limited warranty. Be sure to read the warranty carefully
to determine the coverage for your unit.
Before you call for service...
...check for several easily-solved problems.
If insufficient heating or cooling is suspected:
( ) Check for sufficient airflow.
( ) Check the air filter for dirt.
( ) Check for blocked return-air or supply-air grilles. Be sure they are
open and unobstructed. If these checks do not reveal the cause, call your
servicing dealer.
If your unit is not operating at all, check the following list for easy
solutions:
( ) Check to be sure that your thermostat temperature selector is set
below the indoor temperature during the cooling season. Be sure the
Monthly maintenance items and outdoor unit rinsing may be performed by the consumer. All other maintenance items and all service work must be
performed by a qualified service technician. Read all Warning labels.
Consumer specific:
Inspect, clean, or replace air filter if filter is located indoors in return air duct.
Clear away debris and vegetation near unit.
Dealer specific:
Inspect cabinet and basepan for damage. Replace panels, gaskets, and other components that are damaged or severely
rusted. Make sure precipitation has not entered indoor section of unit.
Inspect electrical disconnect for proper function. Repair or replace as necessary.
Inspect electrical wiring and connections. Tighten loose connections. Inspect and perform functional test of equipment as
needed to ensure proper function. Repair or replace damaged or overheated components and wiring.
Inspect electric heater, if installed. Check for signs of overheating of elements, controls, and wiring. Make sure heater
elements are not broken or electically shorted.
Check refrigerant system subcooling and/or superheat (system dependent).
Inspect inside of unit. Clean if debris is present.
Inspect condenser coil. Clean if dust, dirt, or debris is present. Rinse unit with fresh water (see Note 2).
Inspect condenser motor and fan for damage. Make sure fan spins freely.
Inspect and clean blower assembly (includes blower housing, wheel, and motor).
Inspect evaporator coil. Clean if dust, dirt, or debris is present (see Note 2).
Clean condensate pan and drain lines (more frequent maintenance may be required in humid climates).
Inspect airflow system (ductwork). Check for leaks and repair as needed.
Notes:
1. The above list may not include all maintenance items. Inspection intervals may vary depending on climate and operating hours. Consult your HVAC dealer about a service
contract for seasonal inspections.
2. Do not use harsh chemicals or high pressure water on coils. More frequent rinsing is required for units near a sea coast.
© 2021 Carrier. All rights reserved.
A Carrier Company
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 2 – Maintenance Checklist
Description of Maintenance
Edition Date: 06/21
4
SYSTEM switch or MODE control is in the COOL position and not in
the OFF position.
( ) If your unit still fails to operate, call your servicing dealer for
troubleshooting and repairs. Specify the model and serial numbers of
your unit. (Record them in this manual in the space provided.) If the
dealer knows exactly which unit you have, he may be able to offer
suggestions over the phone, or save valuable time through
knowledgeable preparation for the service call.
In Case of Trouble
If you perform the steps above and unit performance is still
unsatisfactory, shut off the unit and call your dealer.
Dealer's Name _________________________________________
Telephone _____________________________________________
Unit Model ____________________________________________
Unit Serial Number______________________________________
Recommended Interval
Monthly
Annual
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Catalog No: OG-PA4Z-05
Replaces:OG-PA4Z-04
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