Maintenance
Removing the Outdoor Coil and Outdoor Air Thermistors
1.Remove the chassis from the wall.
2.Remove the front cabinet.
3.Remove the control box cover.
4.Disconnect the outdoor coil/air thermistor wiring from the control board.
5.Gently pull outdoor coil thermistor from the bracket near the capillary tube.
6.Gently remove outdoor air thermistor which is located at the drain valve.
7.Remove the outdoor coil/air thermistor from the unit.
Indoor Fan and Motor
1.Remove the chassis from the wall.
2.Remove the front cabinet.
3.Remove the heater/discharge deck assembly. (Refer to the heater disassembly instructions)
4.Remove the control box cover. Disconnect the control wiring. Remove the control box. Refer to the power cord disassembling for instructions on disassembling the control box.
5.Remove the indoor fan motor bracket screws (3) as shown.
6.Remove the set screw (you will need a long Allen wrench) securing the indoor fan to the motor shaft and remove the indoor fan and motor.
Outdoor Fan and Motor
1.Follow the directions for removing the condenser except don’t braze or remove the tubing connecting to the condenser. Capturing the system refrigerant is also not necessary.
2.Remove the screw on the right side of the unit (If you are looking at the back of the PTAC) toward the bottom of the PTAC near the lip of the basepan.
3.Lift the condenser up and over the lip of the basepan and move just enough to gain access to the outdoor fan and motor. Be careful not to damage the bottom of the condenser by sitting it on the lip of the basepan. Also, use caution when bending the condenser to gain access to the outdoor fan and motor. The tubing is very fragile and must be treated with care.
4.Remove the fan.
5.Remove the fan motor by removing the two screws securing it to the fan motor bracket.
6.Disconnect the fan motor wiring from the control by removing the wire junction box cover on the partition panel above the control panel cover.
Control Board Replacement Procedure
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/ tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.
Note: Before replacing the whole control board, make sure that the control board’s fuse is still functioning. The specs for the control board fuse are: 5X20mm, 250V, 315mA, fast acting. For more information on a blown fuse on the Control Board, check the Troubleshooting section of this document.
1.Remove plastic cabinet front and the metal cover that encloses the control board
2.Remove the replacement board from its package and set the power jumper to match the unit voltage .
3.There are two different pin connections, one for 230/208 VAC and another for 265 VAC . The jumper for the 115 VAC board is
Note: This is a very important step, and it might lead to damage of the control board if the jumper is not properly set.
4.Remove connections from the existing control board, tagging wires as required to ensure correct
5.Remove 2 screws from the front plastic mounting ears. Remove the screw from the green wire ground. Slide plastic chassis and board back and lift out of place.
6.Engage catches on bottom of plastic chassis of replacement assembly with sheet metal control box and slide forward to lock in position.
7.
8.Reinstall the sheet metal cover over the control board.
9.Position the front cabinet over the chassis and push the sides until the retaining clips engage.
Figure 28. Power jumper
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