Maintenance Of Indoor Unit; Removing Pcb - York IDM030B21E Series Service Manual

4.2 Maintenance of Indoor Unit

Use the specified non-flammable refrigerant (R410A) to the outdoor unit in the refrigerant cycle.
Do not charge the unit with materials other than R410A, such as hydrocarbon refrigerants
(propane, etc.), oxygen, flammable gases (acetylene, etc.) or poisonous gases when installing,
maintaining and moving the unit. Contamination of these are extremely dangerous and may
cause an explosion, fire, and injury.
NOTE:
During the removal or installation of the parts if the insulation material attached on the cabinet is removed,
then reapply and repair the insulation. Otherwise, condensation may occur when cold air enters.
4.2.1

Removing PCB

(1) Loosen two M4 screws securing the electrical box cover and remove the electrical box cover by lifting
it up.
(2) There are two PCBs, control PCB (PCB1) and power PCB (PCB2). Both PCBs are secured with four
PCB holders. Clamp the center of the PCB holders using a long-nose plier to pull out the PCB.
NOTE:
Do not touch any components on the PCB.
Do not apply excessive force to the PCB or it will cause a malfunction.
SM-16005-rev.2
TURN OFF all POWER supply switches.
Electrical Box Cover
Connector for Condensate Pump
PCB1
PCN7 PCN6 DSW7 DSW4
CN2
ON ON
1 2 1 2
ON
1 2 3 4
ON
1 2
ON
1
TP
CN28
CN1 CN19 THM1 THM2 THM3 THM4 THM5 THU1 CN3 CN14
Tool Phillips Screwdriver
Screws
Tool Phillips Screwdriver, Long-nose Pliers
Connector for Thermistor
DSW5 RSW2
ON 0
3 4 1 2 3 4 5 6
ON
0
5 6 1 2 3 4 5 6
DSW6
RSW1
2 3
DSW8
Connector for Expansion Valve
CN17 CN11
Connector for EconoFresh Kit
Connector for Float Switch
PCB2
Connector for Fan Motor
MAINTENANCE
4-3