Hitachi RWM-(H)FSN3E, Service Manual

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5 Control system
SMGB0070 rev. 1 - 08/2011
115
5
5.2 Printed circuit board
5.2.1 Indoor unit
• PCB Drawing
PCB1 PCB2
PCB1
Connector Indications
Name Connector Nº
Power
Power supply PCN1
Power supply 2 PCN2
Transformer power supply (230v) PCN3A,B
Transformer power supply (24v) CN10A,B
LCD Power supply CN15
Pro-
tection
Device
Low Water Pressure & Water Flow control PCN10
Pump feedback PCN4
Heater protection (Thermostat cut-out) PCN5
Trans-
mission
H-Link communication CN1
PCB1-PCB2 communication CN2,5,6,9
A/D Input Swimming pool water thermistor or 2nd
ambient temperature
CN4
External
Input /
Output
Heater step 1 PCN7
Heater step 2 PCN8
Room thermostat (ON/OFF) PCN6
Swimming pool input PCN10
Electrical Tariff input PCN10
Solar input PCN7
3-way valve swimming pool output PCN8
3-way valve DHW output PCN8
Mixing valve second temperature PCN 9 / 12
Secondary pump output (WP2) PCN9
Secondary pump output (WP3) PCN9
PCB2
Actuator
Pump Actuator PCN1
Boiler signal PCN2
Electrical heater DHW signal PCN3
Solar signal PCN4
A/D Input
Gas Thermistor (THMg) CN12
Liquid Thermistor (THMl) CN11
Water outlet Thermistor (THMwo) CN13
Water inlet Thermistor (THMwi) CN9
Water sanitary tank thermistor (THMDHW) CN10
Water Boiler control thermistor (THMwo3) CN15
Water 2nd temperature thermistor
(THMwo2)
CN16
PCB1
Switch indication
Name Connector No.
Operation
/ Display
Not used DSW1
Capacity Setting DSW2
Additional setting DSW3
Additional setting DSW4
Not used DSW5
H-link (transmission) DSW6
Additional setting DSW7
Refrigerant unit address
RSW1
RSW2
Indoor unit address
RSW3
RSW4
Checking Mode (Forward) PSW1
Checking Mode (Back) PSW2
PCB1
LED indication
Name Connector No.
LEDS
7-segment SEG1,2,3,4,5
Water Pump operation LED1
Heater or Boiler operation LED2
DHW Heater operation LED3
Thermo ON/OFF operation LED4
Power supply in the unit LED5
Alarm (Flickering with 1
sec interval)
LED6
Not used LED7
H-Link transmission LED8