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/configuration 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
