Hitachi PSC-A32MN - Page 165

4 Individual remote controls
PC-ART
TCGB0106 rev.0 - 12/2014
149
4
Step
No.
Microcomputer input/output indication
12 Indoor unit microcomputer input/output.
C1 Z
Heat Thermostat on
Cold Thermostat on
Alarm
Operation
YH2
Y52H
Dark
13 Outdoor unit microcomputer input/output. C2 -
Y211
Y212
Y52C1
Y52C2
Y20B
Y20A
Dark
Fan operating
PCB relay Part name
YH2 Relay for drain pump (MD) and/or dew heater (EHW).
Y52H Relay for electric heater (CEH).
Y211
4-way valve relay.
Y212
Y52C1
Compressor relay.
Y52C2
Y20A
Solenoid valve relay.
Y20B
Symbols with the letter Y are relays on the indoor/outdoor unit PCB plate.