29
1. Indoor power P.C. board
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
Temperature (°F)
Resistance (k
)
32 50 68 86 104 122 140
MSZ-HM18NA MSZ-HM24NA
12V
GND
5V
Fuse (F11)
T3.15AL250V
Varistor (NR11)
Connector to indoor electronic
control P.C. board (CN20A)
5 VDC
12 VDC
GND
Connector to Indoor fan
motor (CN211)
Resistor (R111)
Connector to
Terminal block
(CN201)
(+)3-6 VDC
15 VDC
(-) GND (High
voltage DC)
294/325 VDC
(+)0 or 15 VDC
Timer short
mode point
(Refer to
7-1.)
Room temperature thermistor RT11 (CN111)
Connector to
Indoor coil
thermistor
RT12, RT13
(CN112)
Vane motor
(CN151)
Connector to indoor power
P.C. board (CN10A)
12V DC
5V DC
To disable "Auto restart function",cut the
Jumper wire to JR77. (Refer to 7-3.)
Emergency
operation
switch
(E.O. SW)
(SW1)
GND
2. Indoor electronic control P.C. board
OBH746B
