Test Point Diagram; Ftc (Controller Board) - Mitsubishi Electric EHSD-MEC.UK Service Manual

10-7. Test point diagram

FTC (Controller board)

CNP1/OUT1 (TBO.1 1-2)
Water circulation pump1
(230V AC)
OUT2 (TBO.1 3-4)
Water circulation pump2
(Local supply) (230V AC)
OUT3 (TBO.1 5-6)
Water circulation pump3
(Local supply) (230V AC)
CNP4/OUT14
Water circulation pump4
(230V AC)
OUT5 (TBO.2 1-3)
Mixing valve (Local supply)
(1-2[Close]: 230VAC)
(2-3[Open]: 230VAC)
OUT4 (TBO.2 4-6)
3-way valve/2-way valve
(Local supply)
(4-5: 230V AC)
OUT10 (TBO.3 1-2)
Signal output (Boiler)
(non-voltage contact)
OUT11 (TBO.3 3-4)
Signal output (Error) (230V AC)
OUT12 (TBO.3 5-6)
Signal output (Defrost) (230V AC)
OUT15 (TBO.3 7-8)
Signal output (Comp on)
(230V AC)
OUT13 (TBO.4 1-2)
2-way valve2 (230V AC)
CNIH/OUT9 (TBO.4 3-4)
Signal output for immersion
heater (230V AC)
OUT8 (TBO.4 5-6)
Signal output (Cooling)
(230V AC)
CNBHT
Thermostat input for
booster heater
CNBC
Signal output for booster heater
(230V AC)
CNBH
Signal output for booster heater
(1-3: heater1 230V AC)
(5-7: heater2 230V AC)
IN7
(TBI.1 1-2)
Flow switch 3 input
IN6
(TBI.1 3-4)
Room thermostat 2
input
IN5
IN3
(TBI.1 5-6)
(TBI.1 9-10)
Outdoor ther-
Flow switch
mostat input
2 input
IN4
IN2
(TBI.1 7-8)
(TBI.1 11-12)
Demand
Flow switch 1
control input
input
OCH571
IN1 IN9 CN1A
(TBI.1 13-14) (TBI.3 3-4) Flow sensor
Room thermo- Power meter input
stat input 2 input
IN8 IN10
(TBI.3 1-2) (TBI.3 5-6)
Power meter 1 Heat meter
input input
57
THW7
(TBI.2 5-6)
Thermistor
(Zone1 return
water temp. )
CNW5 THW6
Thermistor (TBI.2 3-4)
(DHW tank Thermistor
water temp.) (Zone1 flow
water temp. )
CN01
Power supply
(230V AC)
F1
10A/250V
F2
6.3A/250V
CN3C
Transmission
(Indoor/Outdoor)
(0 - 24V DC)
LED1
Power supply (FTC)
CNPWM
Water circulation
pump 1
(2 - 3: 5V DC)
LED2
Power supply
(Main controller)
LED3
Transmission
(Indoor/Outdoor)
CNRF
Transmission (Indoor/
Wireless receiver)
(1-2: 11.5 - 13.2 V DC)
CN105
Transmission (Indoor/
WiFi adaptor)
(1-2: 11.5 - 13.2 V DC)
LED4
Reading or writing
data to SD card
CN22/RC(TBI.2 1-2)
Main controller
(10.4 - 13.7 V DC)
CN108
SD card
CN21
Thermistor
(Ref. liquid temp.)
CN20
Thermistor
(Room temp.)
CNW12
Thermistor
(1-2: Flow water temp.)
(3-4: Return water temp.)
THWB2
(TBI.2 13-14)
Thermistor
(Bolier return
water temp. )
THWB1
(TBI.2 11-12)
Thermistor
(Boiler flow
water temp.)
THW8 THW9
(TBI.2 7-8) (TBI.2 9-10)
Thermistor Thermistor
(Zone2 return
(Zone2 flow
water temp. ) water temp. )