Gas Pressure Adjustment; Replacement Of Parts - IDEAL Henrad WH 30 FF Installation And Servicing Manual

53 GAS PRESSURE ADJUSTMENT

PILOT
The pilot is factory set to maximum and no further
adjustment is possible. If, after removing and checking the
injector (as detailed in Frame 58) and ensuring that there is
an inlet pressure of 20 mbar available, the pilot does not
light then contact Caradon Plumbing Limited.
Relight in accordance with 'Initial Lighting', Frame 43.
54 GENERAL
When replacing any component:
1. Isolate the electricity supply.
2. Turn OFF the gas supply.
3. Remove the boiler casing. Refer to Frame 48.
IMPORTANT. When work is complete the casing must be
correctly refitted, ensuring that a good seal is made.
55 SIGHTGLASS REPLACEMENT
1. Refer to Frame 54.
2. Unfasten the 2 nuts and washers holding the sightglass
assembly to the casing front panel.
3. When fixing the new assembly ensure that the parts are in
the correct order. The frame must have the return edge at
the bottom.
4. Retighten the 2 nuts to ensure an airtight seal. Do NOT
overtighten.
6. Replace the boiler casing. Refer to Frame 52.
56 OVERHEAT THERMOSTAT REPLACEMENT
1. Refer to Frame 54.
2. Remove the control box fixing screws.
3. Swing the control box down into the servicing position.
Henrad WH -
FF
Installation
SERVICING

REPLACEMENT OF PARTS

MAIN BURNER
After any servicing, reference should be made to Table 2
which quotes details of the rated output with the related
burner setting pressure and the heat input. Any required
adjustments should be made by using the pressure
adjustment screw.
Refer to 'initial Lighting', Frame 43.
Note. In order to assist fault finding, the control box printed
circuit board is fitted with 2 indicator lights which represent the
following boiler conditions:
Neon I3. Mains electricity ON.
Neon SG1. Flashes to indicate ignition operation (stops after
detection).
The boiler MUST NOT be operated if the casing is not fitted.
4. Pull off the electrical connections at the thermostat. Remove
the backnut retaining the thermostat to the bracket. Withdraw
the thermostat phial from the heat exchanger pocket.
5. Fit the new thermostat and re-assemble in reverse order.
6. Check the operation of the boiler.
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