29
FUNCTIONAL DIAGRAM
NOTE. L-N-E CONNECTION MUST NOT BE INTERCHANGED
CONTROL SWITCHING OF TIME CLOCK AND ROOM THERMOSTAT RATED IS 230 V.a.c.
Fig. 39
F Hv
Fan power supply 230 V
F Lv
Fan signal control
E.P.
External
pump
F
Fuse 3.15A F (fast)
F1-F2
Fuse 3.15A T (delay)
OPE
Gas valve solenoids
S.E. (1)
Spark electrode
S.E. (2)
Sense electrode
C.S.
Condensate
sensor
G.V.
Gas
valve
TSC2 Ignition transformer
TR2
PCB
transformer
FS
Flow thermistor (NTC)
RS
Return thermistor (NTC)
AD02X Main
PCB
CN1÷CN5
Connection to PCB high voltage
X4÷X9
Connection to PCB low voltage
F.O.H.T
Flow over heat thermostat
H.E.T
Heat exchanger thermostat
M3-M3a
Terminal strip for supply in room thermostat
M3b
Terminal strip for esternal pump
X1
Connector minitank (
unused
)
CN12 Service connector
SW1
Co button
A1
24V output to 2CH - programmer
P2
Heating
potentiometer
P3
Selector
switch
R9
Trimmer for maximum output
R10
Trimmer for minimum output
R14
Trimmer for ignition fan speed
R19
Trimmer for heating fan speed
R35
Trimmer
thermoregulation