Supplied By www.heating spares.co Tel. 0161 620 6677
29
FUNCTIONAL DIAGRAM
Fig. 38
NOTE. L-N-E CONNECTION MUST NOT BE INTERCHANGED
CONTROL SWITCHING OF TIME CLOCK AND ROOM THERMOSTAT RATED IS 230 V.a.c.
Key
F Hv
Fan power supply 230 V
F Lv
Fan signal control
P
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
TSC1
Ignition transformer
TR2
PCB transformer
E.S.
External sensor
WPS
Water pressure switch
FS
Flow thermistor (NTC)
RS
Return thermistor (NTC)
AD01A
Main PCB
CN1÷CN5
Connection to PCB 230V
X2÷X16
Connection to PCB 24V
F.O.H.T.
Flow over heat thermostat
H.E.T.
Heat exchanger thermostat
M3-M5
Terminal strip for supply in/clock/room thermostat
M3a-M4
Terminal strip for esternal sensor/condense pump / low
temperature thermostat
OT+
Open therm + connection
JP6
For system open vent boilers
X1
Connector minitank (unused)
CN12
Service connector
SW1
Co button
A1
24V output to 2CH - programmer
P1
DHW potentiometer (unused)
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
UHT
Underfloor heating thermostat
CPA
Condensate pump alarm