Arcoaire PHD4 Instruction Manual

Owner’s Information Manual
A09034
Fig. 1 – Unit PHD4 and WPH4
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.
PHD4, WPH4
14 SEER Single and Three Phase
2-5 Nominal Tons (Sizes 24-60)
Single Packaged Heat Pump System with R-410A Refrigerant
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 #

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.
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.
NOTE: Installer: This manual should be left with the equipment user.
Operating Your Unit
The operation of your heat pump system is controlled by the indoor
thermostat. You simply adjust the thermostat and it maintains the indoor
temperature at the level you select. Most thermostats of heat pump
systems have 3 controls: a temperature control selector, a FAN control,
and a SYSTEM or MODE control. Refer to your thermostat owner’s
manual for more information.
To better protect your investment and to eliminate unnecessary service
calls, familiarize yourself with the following facts:
1. During heating, increasing the desired temperature setting more
than 2°F (1.1°C) may cause the supplemental heaters to be turned
on for a short period of time to satisfy the demand. Needless use of
the supplementary heat reduces potential energy savings.
2. Ice or frost tends to form on the coil during winter heating
operation. Your unit is designed to automatically melt the ice. When
in this defrost cycle, it is normal for steam or fog to rise from the
outdoor unit, and for water to drain from the outside of unit. Do not
be alarmed!
To start the unit:
1. Turn on the electrical power supply to unit.
2. Set MODE control to desired mode and select temperature.
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 system MODE control 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.
Heating Mode
With the SYSTEM or MODE control set to HEAT, your unit will run in
heating mode until the room temperature is raised to the level you have
selected. Of course, your unit will run for longer periods to maintain a
comfortable environment on cooler days and nights than on moderate
ones.
Supplemental Heat
Your unit is your primary heating source. 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 your heat pump needs additional heat to keep you comfortable
your thermostat will turn on the supplemental heat (if equipped).
Defrost Mode
When your unit is providing heat to your home or office and the outdoor
temperature drops below 45°F (7.2°C), moisture may begin to freeze on
the surface of the coil. If allowed to build up, this ice would impede
airflow across the coil and reduce the amount of heat absorbed from the
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, ELECTRICAL SHOCK 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 under water. 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 HAZARD
Failure to follow this warning could result in personal injury or death.
Before performing recommended maintenance, be sure the main power
switch to unit is turned off and a lock-out tag is installed. There may be
more than one disconnect switch.
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing, safety glasses and gloves when
handling parts and servicing furnaces.

PHD4, WPH4: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
outside air. So, to maintain energy-efficient operation, your unit has an
automatic defrost mode.
The defrost mode starts at a preset time interval of 60 minutes, although,
it may be reset to 30, 90 or 120 minutes. Defrost will start at the preset
time only if the ice is sufficient to interfere with normal heating
operation.
After the ice is melted from the coil, or after a maximum of 10 minutes
in defrost mode, the unit automatically switches back to normal heating
operation.
Do not be alarmed if steam or fog appears at the outdoor unit during
defrost mode. Water vapor from the melting ice may condense into a
mist in the cold outside air.
During certain weather conditions such as heavy snow and freezing rain
it is not uncommon for ice to build up on the unit grille. This is normal
for these weather conditions. Do not attempt to remove the ice from the
unit grille. This condition will not affect the proper function of the unit
and will clear within a few days.
Emergency Heating Mode
In the event of primary unit heat failure, the emergency heat mode
allows your supplemental heating source to keep your home or office
warm until your unit can be serviced. Contact your dealer in the event of
primary unit heat failure.
Maintenance and Service
This section discusses maintenance that should be performed by your
dealer and care you, as the owner, may wish to handle for your new unit.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
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) and the
duct side (12 in. [305 mm] minimum clearance).
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 an air filter in place before it can be operated. These
filters should be located in at least one of 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.
The other typical application is an accessory filter rack installed inside
the unit itself. The following information is given to assist in changing
filters used in these internal filter racks.
Filter kits are available as a purchased accessory or a factory installed
option. The same filter kit is included with the accessory economizers
and factory installed economizers.
To replace or inspect filters in accessory filter rack:
1. Remove the filter access panel (See Fig. 3) using a 5/16-in. nut
driver.
2. Remove the filter(s) by pulling it out of the unit. If the filter(s) is
dirty, clean or replace with a new one.
When installing the new filter(s), note the direction of the airflow arrows
on the filter frame.
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. See Table 1 for filter
sizes supplied with accessory filter rack.
A09044
Fig. 2 – Accessory Filter Rack Access Panel
WARNING
!
FIRE, EXPLOSION, ELECTRICAL SHOCK, 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 AND
INSTALL A LOCK-OUT TAG. THERE MAY BE MORE THAN
ONE DISCONNECT SWITCH.
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.
Table 1 – Replacement Filter Sizes
Unit Size Filter Size
24 2 each 20 x 12 x 1
(508 x 305 x 25 mm)
30 2 each 20 x 12 x 1
(508 x 305 x 25 mm)
42-48 1 each 24 x 14 x 1 (610 x 356 x 25 mm),
24 x 16 x 1 (610 x 406 x 25 mm)
36 & 60*
*.Units with bent indoor coil.
1 each 24 x 16 x 1 (610 x 406 x 25 mm),
24 x 18 x 1 (610 x 457 x 25 mm)
WARNING
!
FIRE AND UNIT OPERATION HAZARD
Failure to follow this warning could result in personal injury, death or
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.
Access Panels
Filter Access Panel
For Accessory Filter Rack

PHD4, WPH4: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
A10063
Fig. 3 – Small Chassis Filter Access
Replacing or inspecting filters in units with
economizers
Small Chassis (See Fig. 3)
1. Remove return air duct cover at rear of unit using a 5/16-in. nut
driver.
2. Remove the filter(s) by pulling it out and through the unit duct
opening. If filter is dirty, replace both filters with new ones.
A10062
Fig. 4 – Large Chassis Filter Access
When installing the new filters, note the direction of the airflow arrows
on the filter frame, which should be pointing at the indoor coil.
3. Reinstall duct cover ensuring opening is air and water tight.
Large Chassis (See Fig. 4)
1. Remove filter access door using a 5/16-in. nut driver.
2. Remove the filter(s) by pulling it out and through the unit filter
access door. If filter is dirty, replace both filters with new ones.
Units with bent indoor coils, install 24 x 18 x 1 (610 x 457 x 25 mm)
filter first and then install 24 x 16 x 1 (610 x 406 x 25) filter.
When installing the new filters, note the direction of the airflow arrows
on the filter frame, which should be pointing at the indoor coil.
3. Reinstall filter access door ensuring opening is air and watertight.
Fans and Fan Motor
Periodically check the condition of fan wheels and housings and
fan-motor shaft bearings. Contact your dealer for the required annual
maintenance.
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 factory shipped with a normal charge of the correct
type and quantity of refrigeration grade oil.
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 outdoor and indoor
coils.
2. Inspection and, if required, cleaning of the indoor coil drain pan.
3. Inspection and cleaning of blower wheel housing and motor.
4. Inspection of all supply 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 assure proper
connection.
8. Inspection for leaks in the refrigerant circuit. Pressure and
temperature 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.
RETURN
DUCT COVER
(Remove for
lter access)
SMALL CHASSIS
LARGE CHASSIS
FILTER
ACCESS
PANEL
WARNING
!
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
Do not poke 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.

PHD4, WPH4: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
5
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 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 or above the
indoor temperature during heating season. Be sure the SYSTEM switch
or MODE control is in the COOL or HEAT and not OFF.
( ) 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.

© 2020 Carrier. All rights reserved.
A Carrier Company
Edition Date: 08/20 Catalog No: 518022001107
Replaces: 518022001106
PHD4, WPH4: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
6
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.