Carrier PAJ4 Instruction Manual

Owner’s Information Manual
A05194
Fig. 1 – Unit PAJ4 and WJA4
Our products are designed, tested and built in accordance with DOE standardized procedures; however, actual operating results and efficiencies may
vary based on manufacturing and supplier tolerances, equipment configuration, operating conditions and installation practices.
PAJ4 and WJA4
14 SEER Single-Packaged Air Conditioner System with R-410A Refrigerant
Single Phase
2 to 5 Nominal Tons (Sizes 024-060)
Technician Name
Phone Number
Address
Company Name
Date Installed
NOTE TO EQUIPMENT OWNER:
For your convience, please record the model and serial numbers of your new equipment in the spaces
provided. This information, along with the installation data and dealer contact information, will be
helpful should your system require maintenance or service.
UNIT INFORMATION
ACCESSORIES (List type of model #)
INSTALLATION INFORMATION
DEALERSHIP CONTACT INFORMATION
This manual must be left with the eqipment owner.
NOTE TO INSTALLER:
Model #
Serial #

PAJ4 and WJA4: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2
Safety Considerations
Improper installation adjustment, alteration, service, maintenance, or use
can cause explosion, fire, electrical shock, or other conditions which
may cause death, personal injury, or property damage. Consult a
qualified installer, service agency, or your distributor or branch for
information or assistance. The qualified installer or agency must use
factory-authorized kits or accessories when modifying this product Refer
to the individual instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses, protective clothing, and
work gloves. Use quenching cloth for brazing operations. Have a fire
extinguisher available. Read these instructions thoroughly and follow all
warnings or cautions included in literature and attached to the unit.
Consult local building codes, the current editions of the National
Electrical Code (NEC) NFPA 70 and NFPA 90B-Installation Warm Air
Heating and A/C Systems (Residential).
In Canada refer to the current editions of the Canadian electrical Code
CSA C22.1.
Recognize safety information. This is the safety-alert symbol . When
you see this symbol on the unit and in instructions or manuals, be alert to
the potential for personal injury. Understand these signal words;
DANGER, WARNING, and CAUTION. These words are used with the
safety-alert symbol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING signifies
hazards which could result in personal injury or death. CAUTION is
used to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
.
To Start Unit:
1. Turn on the electrical power supply to the unit.
2. Select temperature and set system switch to desired mode.
To Shut Off Unit:
NOTE: If the unit is being shut down because of a malfunction, call
your dealer as soon as possible.
1. Set the temperature switch to OFF.
2. Turn off the electrical power supply to unit.
Cooling Mode
With the SYSTEM or MODE control set to COOL, your unit will run in
cooling mode until the indoor temperature is lowered to the level you
have selected. On extremely hot days, your unit will run for longer
periods at a time and have shorter “off” periods than on moderate days.
Supplemental Heat
Your system may also be equipped with a supplemental heating source
such as electric heat. On cold days and nights, your system will
automatically turn on the supplemental heat, as needed, in order to
maintain the level of comfort you have selected. When the thermostat
calls for supplemental heat, you may notice the indoor fan increase its
speed.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
For your safety, keep the unit area clear and free of combustible
materials, gasoline, and other flammable liquids and vapors.
To assure proper functioning of the unit, flow of condenser air must not
be obstructed from reaching the unit. Clearance from the top of the unit
is 48 in. (1219 mm). Clearance of at least 36 in. (914 mm) is required on
sides except the power entry side (42 in. [1067 mm] clearance).
WARNING
!
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.Installation and servicing of this equipment
can be hazardous due to mechanical and electrical components.
Only trained and qualified personnel should install, repair, or service
this equipment.
WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Do not store or use combustible materials, gasoline, or other flammable
vapors and liquids in the vicinity of this or any other appliance.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury and/or
death.
Before performing recommended maintenance, be sure the main power
switch to unit is turned off and lock-out tag is installed.
WARNING
!
ELECTRICAL SHOCK AND OPERATION HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
Do not use this unit if any part has been underwater. Immediately call a
qualified service technician to inspect the unit and to replace any part of
the control system which has been under water.
WARNING
!
ELECTRICAL SHOCK AND CUT HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
When removing access panels or performing maintenance functions
inside your unit, be aware of sharp sheet metal parts and screws.
Although special care is taken to reduce sharp edges to a minimum, be
extremely careful and wear protective clothing, safety glasses and
gloves when handling parts or reaching into the unit.

PAJ4 and WJA4: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
Air Filters
The air filter(s) should be checked every 3 or 4 weeks and changed or
cleaned whenever it becomes dirty. Dirty filters produce excessive stress
on the blower motor and can cause the motor to overheat and shut down.
This unit must have air filters in place before it can be operated. These
filters can be located in one of at least two places. In many applications,
the installer will provide return air filter grilles mounted on the wall or
ceiling of the conditioned structure. In the instance of filter grilles, the
filters can simply be removed from the grille and replaced.
Table 1 indicates the correct indoor filter size for your unit.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for
instructions. When replacing filters, always use the same size and type of
filter that was supplied, originally, by the installer.
Fans and Fan Motors
Periodically check the condition of fan wheels and housings and
fan-motor shaft bearings. No lubrication of condenser-or evaporator-fan
bearings or motors is required or recommended.
Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service personnel.
Contact your dealer for the required annual maintenance.
Condensate Drain
The drain pan and condensate drain line should be checked and cleaned
at the same time the cooling coils are checked by your dealer.
Compressor
All compressors are hermetically sealed and do not require periodic
maintenance.
Condenser Fan
The fan must be kept free of all obstructions to ensure proper cooling.
Contact your dealer for any required service.
Electrical Controls and Wiring
Electrical controls are difficult to check without proper instrumentation.
If there are any discrepancies in the operating cycle, contact your local
dealer and request service.
Refrigerant Circuit
The refrigerant circuit is difficult to check for leaks without the proper
equipment. If inadequate cooling is suspected, contact your local dealer
for service.
Unit Panels
After performing any maintenance or service on the unit, be sure all
panels are fastened securely in place to prevent rain from entering unit
cabinet and to prevent disruption of the correct unit airflow pattern.
Regular Dealer Maintenance (Also refer to
Table 2)
In addition to the type of routine maintenance you might be willing to
perform, your unit should be inspected regularly by a properly trained
service technician. An inspection (preferably each year) should include
the following:
1. Inspection and, if required, cleaning of the indoor coil condensate
drain.
2. Inspection and, if required, cleaning of the evaporator drain pan.
3. Inspection and cleaning of blower wheel housing and motor.
4. Inspection of all supply-air and return-air ducts for leaks,
obstructions, and insulation integrity. Any problems found should
be resolved at this time.
5. Inspection of the unit base to ensure that no cracks, gaps, etc., exist
which may cause a hazardous condition.
6. Inspection of the unit casing for signs of deterioration.
7. Inspection of all electrical wiring and components to ensure proper
connection.
8. Inspection for leaks in the refrigerant circuit. Pressure-check to
determine appropriate refrigerant charge.
9. Operational check of the unit to determine working conditions.
Repair or adjustment should be made at this time.
WARNING
!
FIRE, EXPLOSION, ELECTRICAL SHOCK AND CUT
HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE SERVICING OR PERFORMING MAINTENANCE.
2. When removing access panels or performing maintenance
functions inside your unit, be aware of sharp sheet metal parts
and screws. Although special care is taken to reduce sharp
edges to a minimum, be extremely careful when handling parts
or reaching into the unit. Wear safety glasses, gloves and
appropriate protective clothing.
Table 1 – Indoor Air Filter Data
Unit Size Filter Size
024 20x20x1 (508x508x25 mm)
030 20x24x1 (508x610x25 mm)
036-042 24x30x1 (610x762x25 mm)
048-060 24x36x1 (610x914x25 mm)
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in property damage.
Never operate your unit without filters in place. An accumulation of
dust and lint on internal parts of your unit can cause loss of efficiency
and blower motor and/or compressor damage.
WARNING
!
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
Do not insert sticks, screwdrivers, or any other object into revolving fan
blades.
WARNING
!
EXPLOSION, BURN AND ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
System under pressure. Relieve pressure and recover all refrigerant
before system repair or final unit disposal. Use all service ports and
open all flow-control devices, including solenoid valves.

© 2020 Carrier. All rights reserved.
A Carrier Company
Edition Date: 08/20 Catalog No: 46202170303
Replaces: 46202170302
PAJ4 and WJA4: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
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
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______________________________________
Table 2 – Maintenance Checklist
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.
Description of Maintenance Recommended Interval
Consumer specific: Monthly Annual
Inspect, clean, or replace air filter if filter is located indoors in return air duct. X
Clear away debris and vegetation near unit. X
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. X
Inspect electrical disconnect for proper function. Repair or replace as necessary. X
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. X
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. X
Check refrigerant system subcooling and/or superheat (system dependent). X
Inspect inside of unit. Clean if debris is present. X
Inspect condenser coil. Clean if dust, dirt, or debris is present. Rinse unit with fresh water (see Note 2). X
Inspect condenser motor and fan for damage. Make sure fan spins freely. X
Inspect and clean blower assembly (includes blower housing, wheel, and motor). X
Inspect evaporator coil. Clean if dust, dirt, or debris is present (see Note 2). X
Clean condensate pan and drain lines (more frequent maintenance may be required in humid climates). X
Inspect airflow system (ductwork). Check for leaks and repair as needed. X
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.