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REPLACEMENT OF PARTS - Page 15
6.8.
WATER GOVERNOR VENTURI
a.
Gain general access - see 6.2.
b.
Drain the appliance - see 6.6.
c.
Release the union nut and clamping plate then remove
the feed pipe.
d.
Using a large flat bladed screwdriverthat will engage
both slots, remove the venturi.
e.
Clean and re-fit.
6.9.
AUTOMATIC VALVE AND BURNER MANIFOLD
COMPLETE
a.
Gain general access - see 6.2.
b.
Drain the appliance - see 6.6.
c.
Remove the water governor - see 6.7.
d.
Release the union above the flame safety device. Do
not lose the 'O' ring.
e.
Release the retaining plate (2 screws) and remove the
burner supply pipe. Do not lose the 'O' ring.
f.
Prise the manifold location brackets apart and carefully
lift out the complete assembly.
IMPORTANT: The automatic valve and burner manifold
are only available as a combined assembly. Retain all
screws and 'O' rings from the old assembly or renew.
NOTE: On re-assembly slide the pressure test point
extension tube through the grommet before locating the
manifold against the location brackets.
g.
Re-fit the water governor.
h.
Re-connect the burner supply pipe.
i.
Test for gas soundness as follows:-
-
Ensure the water service cock is in the OFF
position, this will ensure that water CANNOT flow
and open the automatic valve.
-
Turn ON the gas, purge and light the pilot, this will
pressurise the burner supply pipe.
-
Test the burner supply pipe joints for gas soundness
using leak detection fluid.
j.
Re-assemble remaining parts and ensure the water
service cock is in the ON position.
IMPORTANT: If the automatic valve and burner manifold
complete is dismantled, it can only be tested for gas
soundness under pressure AFTER blanking off all the
injectors.
Fig. 29
Burner S upply Pipe
Union
'O' Ring
MY99020A
Fig. 30
MY99019A
Fig. 31
'O' Ring
R etaining Plate
Drain S c rew
OFF
W ater
S ervic e
Cock
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