Supplied By www.heating spares.co Tel. 0161 620 6677
19
pull the cover towards you before lifting and
disengaging. Locate and remove the six screws
that secure the front combustion cover, then
remove the cover. Disconnect the electrical con-
nections and silicone tubes attached to the fan,
noting their positions. Locate and remove the
screws (6) that secure the air pressure switch
assembly (4 & 5). Locate and remove the screws
that secure the flue hood and air baffle, disconnect
the flue clip (1) from the fan-flue elbow, and gently
ease the fan (3) & flue hood assembly (2) from its
location. Locate and remove the four screws that
secure the fan to the flue hood. Remove the fan to
flue elbow. Replace in the reverse order. Ensure all
seals are in good condition, taking care to ensure
they are replaced correctly.
6.17
MAIN HEAT EXCHANGER fig. 23/24
Carry out component removal procedure as de-
scribed in 6.4.
Unclip and remove the air chamber cover, gently
pull the cover towards you before lifting and
disengaging. Locate and remove the six screws
that secure the front combustion cover, then
remove the cover. Remove the air chamber side
panels if necessary by unscrewing the securing
screws. Disconnect the flow and return connec-
tions (4,5, fig. 24) and the primary thermistor on
the heat exchanger. The heat exchanger can now
be withdrawn from the appliance. Replace in the
reverse order. Ensure all seals are in good condition,
taking care to ensure they are replaced correctly.
6.18
AIR PRESSURE SWITCH fig. 23
Carry out component removal procedure as de-
scribed in 6.4.
Unclip and remove the air chamber cover, gently
pull the cover towards you before lifting and
disengaging. Locate and remove the two screws
(6) holding the air pressure switch to the air
chamber. Disconnect the electrical connections
and silicone tubes (10) attached to the air pressure
switch, noting their connections/positions. Replace
in the reverse order. Ensure all seals are in good
condition, taking care to ensure they are replaced
correctly.
6.19
FLOW RESTRICTOR fig. 25
Carry out the component removal procedure as
described in 6.4.
Slacken the cold water outlet pipe (A) at the DHW
flow switch and disconnect. Ease the flow restrictor
(B) from its seating. Replace in the reverse order.
Ensure all seals are in good condition, taking care
to ensure they are replaced correctly.
6.20
DHW FLOW SWITCH fig. 25
Carry out component removal procedure as de-
scribed in 6.4.
Disconnect the cold water inlet/outlet pipes (A)
from the DHW flow switch. Disconnect the wiring
to the DHW flow switch. Lift the DHW flow switch
from its location. Replace in the reverse order.
Ensure all seals are in good condition, taking care
to ensure they are replaced correctly.
Fig. 25
6
7
8
1
3
2
9
4
5
10
A
B
C
Fig. 23
Fig. 24