Removal Of Fan And Gas Valve Assembly; Removal Of Non-Return Valve - Keston HEAT 2 45 Installation & Servicing

3.3 REMOVAL OF FAN AND GAS VALVE ASSEMBLY

MODELS: 45 & 55
1. Refer to Section 2.32.
2. Remove the upper front panel, Refer to
Section 3.2.
3. Remove the three screws retaining the
upper and lower flue manifold.
4. To remove the flue manifold lift up
the flue Sections and disengage from
the sump then pull the flue Sections
downwards and remove.
5. Remove the air inlet damper and seal.
6. Disconnect the electrical connections
from the gas valve.
7. Disconnect the electrical connections
from the fan.
8. Undo the gas valve union nut and
replace the fibre washer.
9. Remove the three screws retaining
the fan assembly and remove the fan
assembly.
10. Inspect & clean as necessary.
11. Re-assemble in reverse order replacing
all gaskets.

3.4 REMOVAL OF NON-RETURN VALVE

1. Refer to Section 2.32.
2. Remove the upper front panel. Refer to
Section 3.2.
3. Remove the screw retaining the lower flue
manifold to the heat exchanger.
4. Lift up the flue Sections and disengage
from the sump then pull the flue Sections
downwards and remove.
5. Remove the non-return Valve assembly
and check for damage and that the non-
return valve moves freely. If any damage
is apparent the whole assembly must be
replaced. Ensure correctly sized non-
return valve is fitted.
6. Reassemble in reverse order, ensuring
all flue manifold seals are located and
undamaged. Replace if required.
7. Check the operation of the boiler. Refer to
Section 2.32.
Installation & Servicing
SECTION 3 - SERVICING
3
3
3
5
7
4
5
3
*
6
Inlet Gas
Pressure Test
Point
8
9
55