Thermostat Assembly - Potterton MULTIPOINT Installation And Service Instructions Manual

Gas fired water heater non spouted multipoint model
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Replacement of Parts - Page 15
6.8.
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.
6.9.

THERMOSTAT ASSEMBLY

a.
Gain general access - see 6.2.
b.
Drain the appliance - see 6.6.
c.
Remove the thermostat phial from its pocket.
CAUTION: To prevent possible damage to the heating
unit, release the split tubing nut with a suitable spanner
whilst supporting the phial housing hexagon boss with a
second spanner.
d.
Remove the 2 long screws to detach the thermostat
assembly and spacer from the throttle body.
e.
Remove the rubber grommet from around the capillary
tube in the chassis base then pull the thermostat phial
down through the hole.
Fig. 29
Fig. 30
Fig. 31

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