Supplied By www.heating spares.co Tel. 0161 620 6677
7.19
7.19.1
7.19.2
7.19.3
7.19.4
7.19.5
7.19.6
7.20
7.20.1
7.20.2
7.20.3
7.20.4
7.21
7.21 .1
7.21.2
7.21.3
7.21.4
7.21.5
7.22
7.22.1
TO REMOVE/REPLACE THE HEATING
CONTROL AND DOMESTIC HOT WATER
CONTROL
Remove the casing (sect. 7.3) lower the
instrument panel by unscrew the 2 screws
holding up the instrument panel and con-
trol box and lower it down on its awn
hinges.
Remove the top of the control box cover by
unclipplng it from its 4 locating clips
(2 each side).
Remove the instrument panel from the
control box by unclipping it from its 4 locat-
ing pins (2 each side).
Detach the wires by unclipping the connector
from the control board (Fig. 79).
Unscrew the lock nut which fastens the poten-
tiometer to the instrument panel (Fig. 78).
Replace in reverse order.
TO REMOVE/REPLACE THE MAIN
SWITCH (Fig. 82).
Remove the front panel from the outer cas-
ing (sect. 7.3). lower the instrument panel
(sect. 7.19. 113).
7.23.5
Detach the wires that connect to the switch
make sure that these wires are later recon-
nected to the same poles (Fig. 94).
7.23.6
Pull the switch out from the instrument
panel by pressing the clamp springs.
7.24
Replace in reverse order.
7.24.1
TO REMOVE/REPLACE THE WATER
PRESSURE GAUGE (Fig. 83).
7.24.2
Remove
the casing (sect. 7.3) and lower
the instrument panel (sect. 7.19. 1/3).
Close the heating system on/off valves and
drain the water from the drain point on the
heating system (Fig. 93).
7.24.3
Unscrew the fitting that secures the pres-
sure gauge probe.
7.24.4
Remove the two silicone tubes.
7.24.5
Remove the gauge from the instrument
panel by pressing its fastening springs.
7.24.6
Replace in reverse order.
TO REMOVE/REPLACE THE OVERHEAT
THERMOSTAT
Remove the front panel from the outer casing
(sect. 7.3) and lower the instrument panel.
7.22.3
7.22.4
7.22.5
7.22.6
7.22.7
7.23
7.23.1
7.23.2
7.23.3
7.23.4
Remove the two wires that connect to the
overheat thermostat making sure that
these wires will subsequently be recon-
nected to the same poles (Fig. 94).
Unscrew the plastic cover and locknut that
fastens the overheat thermostat and
remove It.
Remove the split pin and pull the thermo-
stat sensor from its pocket complete with
case sealing grommet.
Remove case sealing grommet from the
old thermostat and fit to new one.
Replace in reverse order.
TO REMOVE/REPLACE THE ELECTRIC
CONTROL BOARD (PCB)
Remove the casing (sect. 7.3) and lower
the instrument panel.
(sect. 7.19.1)
Detach the connectors from the board.
Detach the PCB board from its base by
unscrewing the 4 screws.
Replace in reverse order (ensure all electri-
cal connections are made correctly).
Having replaced PCB recommission boiler
on heating mode (sect. 6.15).
TO REMOVE/REPLACE THE DIFFEREN-
TIAL PRESSURE SWITCH (Fig. 87).
Remove the casing and the combustion
chamber front cover (sect. 7.3 & 4).
Detach the wires that connect to the pres-
sure switch, make sure that these wires are
later reconnected to the same poles
(Fig. 94).
Unscrew the two screws that fasten the
pressure switch to the back of combustion
chamber.
Ensure tubes are connected correctly (Fig.
87) avoiding kinks.
Replace in reverse order ensuring that the
- tapping is connected to the tube termi-
nating inside the case and the + tapping is
connected to the tube terminating at flue
ring (Fig. 87 and 94).
37
