VOKERA Compact 24 Installation & Servicing Instructions Manual - page 23
21
Compact
Fig. 26
Fig. 27
6.18
FLUE FAN (fig. 24 & 28)
Carry out component removal procedure as de-
scribed in section 6.5.
Remove outer combustion cover by un-clipping
the two retaining clips located at the base of the
combustion cover, gently pull the cover towards
you before lifting and disengaging it from the top
retaining lugs. Disconnect the electrical connec-
tions and silicone tubes attached to the fan,
noting their positions. Locate and remove the
combustion test point screws and the cross head
screw which retains the combustion analysis test
point assembly, push the test point into the fan
housing, locate and remove the three screws
which secure the fan to the flue hood, ease the
fan 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
6.19
HEAT EXCHANGER fig. 24 & 26
Carry out component removal procedure as de-
scribed in 6.5. Remove outer combustion cover
by un-clipping the two retaining clips located at
the base of the combustion cover, gently pull the
cover towards you before lifting and disengaging
it from the top retaining lugs. Locate and remove
the two screws at the base of the inner combustion
cover, pull the cover towards you before lifting
and disengaging it from the top retaining lugs.
Remove locking pins and disconnect the hoses,
from the flow and return connections on the heat
exchanger. Disconnect the hot and cold connec-
tions on the heat exchanger. Disconnect the
electrical plugs from the primary thermistor and
high limit thermostat at 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heat exchanger can now be withdrawn from the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.
6.20
AIR PRESSURE SWITCH (fig. 1, 24 & 28)
Carry out component removal procedure as de-
scribed in section 6.5.
Remove outer combustion cover by un-clipping the
two retaining clips located at the base of the
combustion cover, gently pull the cover towards
you before lifting and disengaging it from the top
retaining lugs. Locate and remove the two screws
holding the air pressure switch to the combustion
chamber. Disconnect the electrical connections
and silicone tubes attached to the air pressure
switch, noting their positions. Take-away the wires
belt. Replace in the reverse order. Replace with a
new belt. Ensure all seals are in good condition,
taking care to ensure they are replaced correctly.
6.21
EXPANSION VESSEL
Due to the compact design of this appliance,
removal and/or replacement of the expansion
vessel requires the appliance to be removed from
the wall, if this is deemed impractical, an external
expansion vessel may be fitted to the return pipe
as close to the appliance as possible.
6.22
EXPANSION VESSEL (removal) fig. 1
Carry out component removal procedure as de-
scribed in 6.5.
Isolate gas, water and electrical supplies from the
appliance. Disconnect and remove the electrical
supply cable from the appliance. Disconnect all
service valves and connections from the appli-
ance. Disconnect the flue from the appliance.
The appliance can now be lifted from its mounting
bracket. Lay the appliance on its side and discon-
nect the expansion pipe from the vessel, slacken
and remove the locknut that secures the lower
part of the vessel to the appliance frame. Locate
and remove the six screws that secure the vessel
top holding plate, remove the plate. The expan-
sion vessel can now be removed. Replace in the
reverse order. Ensure all seals are in good con-
dition, taking care to ensure they are replaced
correctly. GAS AND WATER SOUNDNESS
CHECKS MUST BE CARRIED OUT.
Fig. 28