Nortek PSA4BG User manual

VARIABLE SPEED, R-410A
IMPORTANT SAFETY INFORMATION
WARNING:
To avoid possible equipment damage, fire,
or death, the following instructions must be
observed regarding unit maintenance and
operational procedures.
Please read all instructions before servicing this equipment.
Pay attention to all safety warnings and any other special
notes highlighted in the manual. Safety markings are used
frequently throughout this manual to designate a degree
or level of seriousness and should not be ignored.
WARNING indicates a potentially hazardous situation that
if not avoided, could result in personal injury or death.
CAUTION indicates a potentially hazardous situation that
if not avoided, may result in minor or moderate injury or
property damage.
Keep this literature where you have easy access to it in
the future. If a problem occurs, check the instructions and
follow recommendations given. If these suggestions don’t
eliminate your problem, call your servicing contractor. Do
not attempt to service this unit yourself!
• To achieve optimum performance and minimize
equipment failure, it is recommended that periodic
maintenance be performed on this unit. The ability
to properly perform maintenance on this equipment
requires certain mechanical skills and tools. Please
consult your dealer for maintenance information and
availability of maintenance contracts.
• The area around the cooling unit a must be kept clear
and free of combustible materials, gasoline, and other
flammable vapors and liquids. Do not store or use
flammable items such as paint, varnish, or strippers
in the vicinity of the unit.
• Do not use this appliance 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 and any gas control which has been under
water.
• Familiarize yourself with the controls that shut off the
electrical power to the unit. If the unit needs to be shut
down for an extended period of time, turn off electrical
power at the circuit breaker. For your safety always turn
off the electrical power before performing service or
maintenance on the unit
USER'S MANUAL
WARNING
• Under no circumstances should the appliance owner attempt to install and/or service this
equipment. Some local codes require licensed installation / service personnel for this
type of equipment. Improper service, adjustment, or maintenance may cause explosion,
fire, electrical shock or other hazardous conditions which may result in personal injury or
property damage.
• Read these instructions thoroughly before using the equipment. Follow all precautions and
warnings contained within these instructions and on the unit.
• Improper installation, adjustment, alteration, service, or maintenance can cause personal
injury or property damage. Refer to this manual. For assistance or additional information,
consult a qualified installer or service agency.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
DO NOT DESTROY. PLEASE READ CAREFULLY & KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
SPLIT SYSTEM AIR CONDITIONER 20 SEER

2
ABOUT THE AIR CONDITIONER
This split system cooling unit has been designed and built
to provide many years of safe and dependable comfort,
providing it is properly installed and maintained. With
regular maintenance, this unit will operate satisfactorily
year after year. Abuse, improper use, and/or improper
maintenance can shorten the life of the appliance and
create unsafe hazards. A regular service and maintenance
schedule should be established to ensure efficient and
safe operation of the unit.
OPERATING INSTRUCTIONS
The primary control for the overall heating and cooling
system is provided by the indoor thermostat. Refer to
the thermostat's user manual for detailed programming
instructions.
The thermostat should be mounted about 5 feet above the
floor on an inside wall and not on an outside wall or other
location where its operation may be adversely affected by
radiant heat from fireplaces, sunlight, or lighting fixtures,
and convective heat from warm air registers or electrical
appliances.
The 20 SEER air conditioner is a variable speed system.
Normally the compressor will operate at one of 5 speeds,
each predetermined for a balance of optimum efficiency
and capacity.The outdoor fan motor will also operate at
multiple speeds, following the compressor.
The control will not permit the unit to operate in outdoor
temperatures below 50° F. If there is a call for air
conditioning when the temperature drops below this
point, the outdoor unit will shut down (if running) and the
indoor blower will run. After the lockout is in effect, the
unit can resume cooling after the outdoor temperature
rises above 55° F.
The speeds used will depend on several factors, including:
• Whether first or second stage operation is called for
by the thermostat (which must be two stage-capable),
• Outdoor ambient temperature.
• The length of time the equipment has been operating
during the current cycle
• The operating speed history, for both the current and
the previous operating cycles.
Cooling Operation
1. Set the thermostat’s system mode to COOL or AUTO
and change the fan mode to AUTO. See Figure 1.
2. Set the temperature selector to the desired
temperature level.The outdoor fan, compressor, and
blower motor will all cycle on and off to maintain the
indoor temperature at the desired cooling level.
NOTE: If the temperature level is re-adjusted, or the
system mode is reset, the fan and compressor in the
outdoor unit may not start immediately. A protective
timer circuit holds the compressor and the outdoor fan
off for approximately 5 minutes following a previous
operation or the interruption of the main electrical
power.
Heating Operation
1. Set the thermostat’s system mode to HEAT or AUTO
and change the fan mode to AUTO. See Figure 1.
2. Set the temperature selector to the desired
temperature level. The optional heating equipment
(furnace or electric heat) will cycle on & off to maintain
the indoor temperature at the desired heating level.
Operating the AC for Automatic Cooling &
Heating
1. Set the thermostat system mode to AUTO and the
thermostat fan mode to AUTO. See Figure 1.
2. Set the thermostat temperature selector to the
desired temperature level. The thermostat will
maintain the desired temperature level by switching
between either the outdoor cooling unit or the indoor
heating unit (furnace or electric heat) automatically.
Operating the Indoor Blower Continuously
The continuous indoor blower operation is typically used
to circulate the indoor air to equalize a temperature
unbalance due to solar loads, increased occupancy loads,
or mechanical equipment operation. Set the thermostat
fan mode to ON (Figure 1). The indoor blower starts
immediately, and will run continually until the fan mode
is reset to AUTO.
NOTE: The continuous indoor blower operation can be
obtained with the thermostat system mode set in any
position, including OFF.
Turning the Air conditioner Off
Change the thermostat’s system mode to OFF and the fan
mode to AUTO (See Figure 1). NOTE: The system will not
operate, regardless of the temperature selector setting.
Figure 1. Digital Thermostat
Fan
Mode
Temperature
Selector
System
Mode

3
AIR CONDITIONER MAINTENANCE
WARNING:
This air conditioner contains liquid and gaseous
refrigerant under pressure. Installation and
servicing should only be attempted by qualified,
trained personnel thoroughly familiar with the
equipment and safe responsible refrigerant
handling procedures. Failure to comply with
this warning could result in equipment damage,
personal injury, or death.
WARNING:
To prevent electrical shock, personal injury, or
death, disconnect all electrical power to the unit
before performing any maintenance or service.
The unit may have more than one electrical supply.
CAUTION:
DO NOT touch any of the internal electrical
components while cleaning the unit.
Proper maintenance is important to achieve optimum
performance from the air conditioner. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult your
local dealer about the availability of maintenance contracts.
Routine maintenance should include the following:
Regular Cleaning
CAUTION:
DO NOT touch any of the internal electrical
components while cleaning the unit.
• The area around the unit and the vicinity of any other
appliances must be kept clear and free of combustible
materials, gasoline, and other flammable vapors and
liquids. Do not store or use flammable items such as
gasoline, paint, varnish, or strippers in the vicinity of
the unit.
• Keep the outdoor unit clean. Hose off periodically and
keep unit fins clear of leaves and grass clippings. Be
careful not to damage the aluminum fins. Clean
the outdoor coil and fins as necessary using a mild
detergent and water. Rinse thoroughly with water. Do
not use a pressure washer to clean the unit.
• Keep the outdoor unit clear of obstructions. DO NOT
obstruct airflow with tall plants or shrubs. Check for and
remove any obstructions such as twigs, sticks, etc.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Air Filters
WARNING:
Never operate the unit without a filter in the return
air system. Dust and lint in the return air can
build up on the internal components, resulting
in loss of efficiency, equipment damage, and
possible fire risk.
• Inspect and clean or replace air filters at the beginning
of each heating and cooling season, or more frequently
if required. A clogged filter could cause airflow related
problems and reduce the overall efficiency of your unit.
Always replace disposable filter(s) installed in your
system only with the same size dimensional filters
that are being replaced.
• Never operate the appliance without a filter installed in
the return air duct. Inspect filters frequently and replace
when necessary with filter of same dimensional size.
TROUBLESHOOTING
Before you call a Technician, check the following:
• Check the thermostat setting. Make sure the system
mode and temperature settings are correct.
• Check the electrical panel for tripped circuit breakers.
• Check the filters for dust accumulation.
• Check the unit and make sure it is clean and not
covered with grass or leaves.
• If the items above don’t resolve your problems, then
call your nearest service technician.
WARRANTY INFORMATION
A warranty certificate with full details is included with the
equipment. Carefully review these responsibilities with
your dealer or service company. The manufacturer will not
be responsible for any costs found necessary to correct
problems due to improper setup, improper installation,
adjustments, improper operating procedure on the part
of the user, etc.
Some specific examples of service calls which are not
included in the limited warranty are:
• Correcting wiring problems in the electrical circuit
supplying the equipment.
• Resetting circuit breakers or other switches.
• Adjusting or calibrating of thermostat.

10348430
(Replaces 7096610)
Specifications & illustrations subject to change without notice or incurring obligations (01/21).
O’Fallon, MO, © Nortek Global HVAC LLC 2021. All Rights Reserved.