Technical data

Fig. 9. Functional flow
diagram.
13
To Programmer
Note: If programmer fails, link
connector terminals, as shown by
dotted line, to create temporary
heat availability.
Switched central
heating from
programmer
Switched hot
water from
programmer
Live supply
to programmer
Neutral
Connector
X2 on
control
board
Plug-in
connector
CH
DHW
L
N
Fig. 11. Programmer connections.
N
Room thermostat
External frost thermostat
Remove link
Live supply
Neutral
Live return
Fig. 10. Room/frost thermostats.
Modulating Valve
Diverter Valve
CH Temperature Control
HW Temperature Control
CH / Primary Sensor
HW Sensor
Tank Sensor
Overheat Thermostat
System Thermostat
TTB Thermostat (OF only)
Flow Turbine
INPUTSOUTPUTS
INDICATORS
Convert AC to Low Voltage DC
MICROPROCESSOR/
ELECTRONICS
(Safety Low Voltage)
Mains ON
(Green)
CH Light
(Red)
DHW Light
(Red)
Heating demand
from Programmer
(or link L to CH)
Hot water demand
from Programmer
(or link L to DHW)
X2
PIN CH
X2
PIN DHW
X3
PIN Rs
X3
PIN N
X3
PIN R
R
Frost Thermostat
(if fitted)
X3
PIN Fs
X3
PIN F
R
X2
PIN L
Fuse F1
2A Slow
X1
PIN L
LIVE IN
X1
PIN N
Fuse F2
1A Fast
N
TRANSFORMER
X5
PIN 1
N
IGNITOR
CIRCUIT
MAIN
VA LV E
PILOT
VA LV E
NAC / GAS VALVE
ELECTRONICS
ELECTRONICS
X8
PIN 3
X8
PIN 2
Red
Black
Brown
Brown
PUMP
Nc
NO
C
Brown
X6
PIN 1
RL102
Brown
X6
PIN 4
FAN
RL101
White
Grey
X6
PIN 2
X6
PIN 3
X8
PIN 1
Spark at pilot bracket
AIR PRESSURE
SWITCH
X7
FLAME SIGNAL
(DE-ENERGISES RL101)
Room Thermostat
(or link)
RR
RS
FR
FS
X3