Troubleshooting; Replacement Procedures - WaterFurnace AT022C/D Installation And Maintenance Manual

Troubleshooting

Replacement
Procedures
24
PREMIER 2 SINGLE-SPEED INSTALLATION AND MAINTENANCE MANUAL
CONTROLS
To check the unit control board for proper operation:
1) Disconnect thermostat wires at the control board.
2) Jumper the desired test input (Y1, Y2, W, O or G) to the C terminal with the SW2-8 in the
"ON" position) to simulate a thermostat signal.
3) If control functions properly:
• Check for thermostat and field control wiring (use the diagnostic inputs mode).
4) If control responds improperly:
• Ensure that component being controlled is functioning (compressor, Blower, Revering
valve, etc.).
• Ensure that wiring from control to the component is functioning (use the diagnostic
outputs mode).
• If steps above check properly, replace unit control.
Note: Refer to the wiring schematic on pages 13-16 for additional information.
REFRIGERANT SYSTEM
NOTE: Verify that air and water flow rates are at proper levels before servicing the
refrigerant circuit.
To maintain sealed circuit integrity, do not install service gauges unless unit operation
appears abnormal (refer to the unit operating pressores on page 25). If superheat and subcooling
are outside recommended ranges, an adjustment to the refrigerant charge may be necessary.
OBTAINING PARTS
When contacting WFI for service or replacement parts, refer to the model number and serial
number of the unit as stamped on the serial plate attached to the unit. If replacement parts are
required, mention the date of installation of the unit and the date of failure, along with an explana-
tion of the malfunctions and a description of the replacement parts required.
IN-WARRANTY MATERIAL RETURN
Material may not be returned except by permission of authorized WFI warranty personnel.
Contact your local distributor or the WFI warranty department for warranty return authorization
and assistance.