Operating The Boiler; Switching The Boiler On/Off; Setting The Heating Temperature; Controlling The Central Heating - Bosch External System 12/18 Users Instructions And Customer Care Manual

2.2

Operating the boiler

2.2.1 Switching the boiler on/off

▶ To switch on the boiler; turn on the water, oil and electricity supply to the boiler.
▶ Check the programmer/timer is correct and is set to ON.
▶ Set the room thermostat to the desired setting.
▶ Open and set thermostatic radiator valves as required.
▶ Turn the boiler water temperature control to the required setting.
▶ To switch off the boiler; turn the programmer/timer to OFF for heating and hot water.
If the boiler is left unused and exposed to freezing conditions; shut off all the mains supplies, isolate the boiler and drain the
system and boiler.

2.2.2 Setting the heating temperature

▶ Turn the control clockwise to increase the water temperature. The demand light will illuminate until the water reaches the set
temperature. Once the set temperature is reached the demand light extinguishes
▶ Turn the control anti-clockwise to reduce the water temperature.
The minimum and maximum ranges of the temperature control positions are approximately 55°C to 81°C.

2.2.3 Controlling the central heating

▶ Set the programmer/timer to the correct time with the required ON/OFF periods.
▶ Turn the room thermostat to the temperature required.
▶ Set thermostatic radiator valves to the required temperature for each room.

2.2.4 Frost protection

▶ The appliance has a built-in frost thermostat to protect the internal components.
▶ Frost thermostats can be wired into the boiler.
▶ Frost protection should be fitted to the system where the system is most exposed and at risk of freezing.
If there is no hot water or heating, check
page 6 and 7 for fault condition guidance.
Danesmoor External & External System– 6 720 809 792 (2013/10)
flue boiler
reset reset
flue boiler
reset reset
Using your boiler
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