User guide
17
5. The pump is operated from the boiler control. It should be connected to the pump terminals on the
boiler control board. The pump will run whenever the CALL indicator is illuminated (green) either
ashing or steady, and it will also continue to run if the boiler is hot, even after the demand has
ceased. It will turn off the pump when the boiler temperature falls below approximately 75
0
C. It will
also turn the pump back on if the water temperature rises above 75
0
C again. A bypass must be
incorporated in systems where the heating load can shut down, i.e. when valves or thermostatic
radiator valves are tted. See note on the bypass (page 5).
6. The ALARM indicator ashing (red) will only illuminate if there is a problem. If there is a water
problem the HEAT and the CALL (green) indicators will turn off. The boiler will remain in this tripped
state until the fault is corrected and the boiler is re-set.
7. An ALARM indicator ashing(red) together with the CALL indicator (red) indicates an over
temperature problem.
NO CONNECTION
PUMP SUPPLY CABLE
0.5mm - 1mm
MAINS SUPPLY CABLE
BOILER CONTROL CABLE
0.5mm - 1mm
SUPPORT BACK
OF PCB WHEN
TIGHTENING SCREWS
ENSURE SCREWS
ARE TIGHT.
LOOSE CABLE
CONNECTIONS
CAN CAUSE A
FIRE
SUPPLY
CONN 5
CONN 1
FS 1 2A 240V
(5 X 20mm)
REMOVE TOP COVER
ONLY TO GAIN ACCESS
TO THE CONNECTIONS
ON THE PRINTED
CIRCUIT BOARD
INSIDE THE BOILER
HOUSING
LIVE
EARTH
NEUTRAL
LIVE
EARTH
NEUTRAL
RUN
NEUTRAL
N
L
CONTROL
PUMP
CONTROL
PUMP
NC N R E N L
NC N R E N L
CASE EARTH
INITIAL TEST SET UP
REMOVE PUMP LIVE AND PUMP
NEUTRAL WIRES FROM CONN1 BLOCK.
RECONNECT PUMP LIVE TO RUN WIRE.
RECONNECT PUMP NEUTRAL TO
NEUTRAL.
UNPLUG CONN1 BLOCK FROM PCB.
ENSURE IT IS SAFE BEFORE CARRYING
OUT TEST.
POWER UP SYSTEM WITH ALL
CONTROLS SET TO RUN.
ENSURE THE BOILER SUPPLY LIGHT IS
ON, CALL LIGHT IS OFF AND PUMP
IS RUNNING.
THIS COMPLETES THE TEST.
SWITCH OFF ALL POWER TO BOILER
AND RECONNECT PUMP NEUTRAL
AND PUMP LIVE WIRES BACK TO
THEIR ORIGINAL POSITIONS.
PLUG THE TERMINAL BLOCK
BACK INTO CONN1 ON THE PCB.
ENSURE CONNECTION SCREWS ARE
TIGHT
2
2
2 2
FIGURE THIRTEEN: INITIAL TEST SET UP