3
OPERATING INSTRUCTIONS
12
3-A Boiler Controls
Visible on the front boiler casing are
• Central Heating thermostat control.
• Time control - Domestic Hot Water. & Central Heating (optional).
• Limit-stat reset button (see diagram on page 11).
• Pressure Gauge
Also indicator lights. These are:
• Mains ‘on’.
• Burner lockout.
• Domestic Hot Water
• Central Heating
3-B Operating Procedure
To start the boiler follow this sequence:
■ Turn on fuel supply.
■ Switch on power supply to boiler.
■ Set the boiler thermostat to the required temperature.
■ Set timer - Domestic Hot Water & Central Heating.
The central heating thermostat controls the boiler when in central
heating mode only, thus maintaining the required boiler water
temperature output for central heating.
Domestic hot water temperature is controlled by separate non
adjustable thermostat, plus thermostatic mixing valve. See page 15.
Safe operation is also maintained by the burner control system which
provides the required ignition and shut off sequence.
If the optional timer controls are fitted this will automatically
switch the boiler off and on when cental heating and Domestic
Hot Water is required.
The boiler can be turned off by any of the following means:
■ Turn both timer switches to OFF.
■ Turn OFF the mains electrical supply to the boiler.
WHEN SERVICING ALWAYS SWITCH OFF THE MAINS SUPPLY TO
THE BOILER
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