Maytag PSA4BG048K User Manual

Split System Air Conditioner
FS4BG & PSA4BG Series 20 SEER
The 20 SEER, iQ Drive
®
split system air conditioner operates as part of a larger system which can provide temperature,
air flow, and humidity control for a residence or other similarly sized building. This system includes this outdoor unit and a
compatible indoor unit, typically a gas furnace or an air handler with electric strip heat. Accessory equipment which may be
used with the system includes humidifiers, electric or electronic air cleaners, and U/V (ultraviolet) sterilizing lamps.
Refer to the System Operation section within this document for a description of how the air conditioner operates. In addition,
information for troubleshooting and diagnosing problems is included.
OTHER REFERENCE DOCUMENTS
• Installation instruction documents for indoor equipment
(furnace or air handler, optional humidifier, etc.)
• localwiringandbuildingcodes
• ApplicationGuidelineforRefrigerantLinesOver75Feet,
document 044B-0600
• Operation/congurationmanualfortwo-stagethermostat
(existing or newly installed)
DO NOT DESTROY. PLEASE READ CAREFULLY AND
KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
IMPORTANT
ATTENTION INSTALLERS:
It is your responsibility to know this product better
than your customer. This includes being able
to install the product according to strict safety
guidelines and instructing the customer on how
to operate and maintain the equipment for the
life of the product. Safety should always be the
deciding factor when installing this product and
using common sense plays an important role as
well. Pay attention to all safety warnings and any
other special notes highlighted in the manual.
Improper installation of the unit or failure to follow
safety warnings could result in serious injury,
death, or property damage.
These instructions are primarily intended to assist
qualified individuals experienced in the proper
installation of this appliance. Some local codes
require licensed installation/service personnel for
this type of equipment. Please read all instructions
carefully before starting the installation. Return
these instructions to the customer’s package for
future reference.
IMPORTANT SAFETY INFORMATION .......................2
PREPARATION ............................................................3
Slab Mounting ................................................................... 3
Roof Mounting .................................................................. 3
ELECTRICAL CONNECTIONS ...................................4
Electrical Power Wiring ..................................................... 4
Control Circuit Wiring ........................................................ 4
REFRIGERANT LINE CONNECTIONS ....................... 4
LineDesignandRouting .................................................. 4
Brazing .............................................................................. 5
System Evacuation ........................................................... 5
Refrigerant Charging ........................................................ 5
Charging Operation .......................................................... 6
Alternate Procedure for Charging the Air Conditioner
in Cooling Mode ................................................................ 6
SYSTEM OPERATION .................................................6
Thermostat ........................................................................ 6
BlowerFlowRates ............................................................ 6
Start-Up Sequence ........................................................... 6
Run Sequence .................................................................. 6
Diagnostic Display ............................................................ 7
Short Cycle Timer Override .............................................. 7
LowTemperatureLockouts .............................................. 7
Other Speed Overrides ..................................................... 7
Instrumentation ................................................................. 7
TROUBLESHOOTING .................................................8
InverterCircuitBoardLEDs .............................................. 8
No Control Board Display ................................................. 9
TroubleshootingIndividualFaultCodes(whenactive) ..... 9
MAINTENANCE ...........................................................10
FIGURES & CHARTS ..................................................11
Figure2.AirConditionerControlPanel(CoverRemoved) 11
Figure3.PowerWiringTerminals ...................................... 12
Figure4.LowVoltageCompartmentforControlWiring ..... 12
Figure5.ServiceValves .................................................... 12
Figure6.ChargingChart ................................................... 13
Figure7.InterfaceBoardinControlPanel ......................... 13
Figure8.WiringDiagram(2,3&4TonModels) ................ 14
Figure9.WiringDiagram(5TonModels) .......................... 15
Figure10.TemperatureSensorResistanceCharts ........... 16
INSTALLATION / PERFORMANCE CHECK LIST ......20
INSTALLATION INSTRUCTIONS

Maytag PSA4BG048K Specifications

General

Brand	Maytag
Model	PSA4BG048K
Category	Air Conditioner
Type	Split System
Voltage	208/230V
Phase	1
Energy Efficiency Ratio (EER)	12.5
Refrigerant	R-410A
Cooling Capacity	48000 BTU
SEER Rating	16 SEER
Heating Capacity	48000 BTU
Heating Amps	20.2 A
Width	35.5 inches
Operating Temperature (Cooling)	55°F - 125°F

Summary

Electrical Connections

Electrical Power Wiring

Covers compliance with electrical codes, wire sizing, and connection points for power supply to the outdoor unit.

Control Circuit Wiring

Explains the 24 vac control circuit wiring requirements, including thermostat and indoor unit connections.

Refrigerant Line Connections

Line Design and Routing

Provides guidelines for routing refrigerant lines, including bend restrictions, support, and material requirements for efficiency.

Brazing

System Evacuation

Describes the process of evacuating the system to remove non-condensables and moisture using a vacuum pump.

Refrigerant Charging

Explains the methods for charging the system with refrigerant, including weight and subcooling methods for optimal performance.

Troubleshooting

Inverter Circuit Board LEDs

No Control Board Display

Troubleshooting Individual Fault Codes (when active)

Offers systematic procedures for diagnosing and resolving specific fault codes indicated by the system.