Fan; Gas Valve - andrews MAXXflo EVO Lite Installation And Maintenance Manual

a
c
e
10 Maintenance

10.4.8 Fan

b
The combustion fan is best removed when the whole burner assembly The combustion fan is best removed when the whole burner assembly
has been detached from the heat exchanger (see 10.3.2 for details), but has been detached from the heat exchanger (see 10.3.2 for details), but
can also be removed individually if these steps are followed: can also be removed individually if these steps are followed:
b
1. 1. Carefully remove the two electrical connectors (a) from the fan. Carefully remove the two electrical connectors (a) from the fan.
a
2. 2. Remove two cap screws (c) securing the venturi to the fan. Remove two cap screws (c) securing the venturi to the fan.
3. Remove four bolts (b) securing the fan to the air arm.
4. Slide fan off venturi and remove.
c
5. Inspect both the venturi gasket and air arm gasket and replace if dam-
aged.
6. Replacement is the reverse.
7. After replacement, operate the burner and check for gas leaks.
8. Perform a fl ue gas analysis check of the CO & CO
for details).
Important
Please ensure that the cork gasket between the fan and the ven-
d
turi is correctly placed before fi xing the two venturi screws. Place
a screw through the venturi (d) to hold the gasket in place when
refi tting to fan

10.4.9 Gas valve

1. Turn off the gas supply to the heater.
2. Undo the securing screw and remove the electrical connector (f) from
the gas valve.
3. Remove four 4mm allen bolts (g) securing the gas pipe to the valve.
4. Release the gas valve from the venturi by undoing three 4mm allen
bolts (e).
f
5. Transfer the rubber gasket to the new gas valve and orifi ce if fi tted.
6. Replacement is the reverse.
g
7. Turn on the gas supply and check for gas leaks.
8. Perform a fl ue gas analysis check of the CO & CO
for details).
Valve Coil resistances are 2.8k and 1.6k ohms
85
settings (see 7.2.3
2
settings (see 7.2.3
2
MAXXfl o EVO Lite