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SECTION 7
GAS
CONTROL
VALVE
USER-
ADJUSTABLE
CONTROL
THERMOSTAT
WITH LIMIT
SENSOR PHIAL
AND OVERHEAT
ECO
38
REPLACING COMPONENTS, Hi-Flo RANGE
NOTE! Models L62/309 and L54/399 are fitted with an anchor bracket between the
burner manifold and the heater body. Remove two screws to release the anchor bracket.
1. Turn gas control knob and gas service cock to OFF.
2. Disconnect pilot feed pipe, thermocouple and thermostat leads from gas valve.
3. Disconnect union joint from gas service cock.
4. Unscrew two wing nuts and remove draught shield. Remove four screw located at
each end of the burner manifold and withdraw gas control/burner manifold as a unit.
5. Unscrew the control valve from the burner manifold noting position of the parts.
6. Remove gas service cock union from the control valve.
7. Re-assembly is reverse of above. The joints between the gas cock union and the
control valve to burner manifold must be made using an approved jointing compound
suitable for natural gas. The gas valve must be fitted so that it is square relative to the
centre line of the injectors.
8. Re-commission the heater as detailed in Section 4, Commissioning.
Please note that when replacing the gas control valve on heater models L32/143 &
L65/169 a restrictor must be fitted at the bottom of the gas valve inlet thread.
NOTE! These instructions apply to all models but Model L32/143 is not fitted with a limit
sensor phial.
1. Turn off the gas control and the service cock.
2. Drain the heater.
3. Remove front cover from control thermostat.
4. Disconnect black, red and white leads and withdraw.
5. Remove phial guard by removing two screws.
6. Remove the clips locating the thermostat capillary.
7. Unscrew gland nut securing limit phial and pull out the phial.
8. Rotate control thermostat/limit phial unit anti-clockwise using a smooth jawed spanner
and withdraw.
9. Re-assembly is reverse of above. The joint between control thermostat and tank must
be made using an approved jointing compound.
10. Re-commission the heater as detailed in Section 4, Commissioning.
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