Gas Control Valve Replacement; Diverter Valve Actuator Replacement - IDEAL istor HE260 Installation And Servicing

72 GAS CONTROL VALVE REPLACEMENT

1. Refer to Frame 53 & 54.
Note.
Ensure surrounding water system pipework is cooled to a
point where it cannot represent a burn hazard.
2. Slacken the backnut on the DHW expansion vessel and
remove to one side as shown.
3. Unplug the electrical lead from the gas control valve and
disconnect the earth wire.
5

73 DIVERTER VALVE ACTUATOR REPLACEMENT

1. Refer to Frame 53 & 54.
2. Unplug the electrical lead from the valve
actuator.
3. Slacken off the screw and pull off the
cover.
4. Slacken off the 2 screws and pull off the
complete assembly from the mounting
plate.
5. Fit the new actuator and re-assemble in
reverse order.
6. Check operation of the boiler. Refer to
Frame 49.
istor system store -
Installation and Servicing
SERVICING
4. Remove the sensing tube from the gas control valve.
5. Undo the gas inlet pipe union.
6. Undo the union nut on the RHS of the gas control valve.
7. Withdraw the valve, complete with inlet pipe.
8. Fit the new valve and re-assemble in reverse order.
9. Check operation of the boiler. Refer to Frame 49.
4
3
6
3
2
Gas cock
(shown in the closed position)
ist9853
ist8381
53