Bosch GREENSTAR II HE OIL 12/22 Operations Instructions download pdf (Page 5)

(d) Turn the thermostat control knob to the desired position

(see Fig. 2: temperature control).

(e) Your boiler will now commence a start sequence, in which a

pre-ignition period of approximately 15 seconds is followed by

a supply of atomised oil being introduced into the combustion

chamber. Ignition then occurs, followed by a post-ignition

period of approximately 20 seconds.

(f) Your boiler is now in a steady run condition and will remain

so until the water temperature reaches the temperature set on

the control thermostat. At this point the burner will stop and

the boiler will shut down. The sequence will continue until

the boiler is programmed - either manually or by an automatic

programmer - for a period of shutdown.

The temperature control knob gives you con-

trol over the water temperature in your central

heating radiators, and you can adjust it to any

position within the indicated range (as shown in

Fig. 2).

Higher settings obviously mean hotter radia-

tors and rooms will reach the required tempera-

ture quicker. The ideal setting varies from proper-

ty to property, and can only be established by trial

and error and experience: a setting of medium to

high should serve as a good initial guide.

PLEASE NOTE: The control knob must not be

set below the first indicating bar.

HIGH LIMIT THERMOSTAT

Your boiler is fitted with a high limit cut out thermostat,

designed to protect the central heating system in the event of

the boiler running beyond a safe temperature level due to a con-

trol malfunction. This is indicated by excessive operating tem-

perature and the mains power indicator lamp going off. The

thermostat will reset itself when the boiler cools to a safe operat-

ing level.

TEMPERATURE CONTROL

SAFETY THERMOSTAT

The control knob has a range of adjustment as indi-

cated by the symbols.

Fig. 2.

TEMP

Low

Setting

High

Setting

1 2 3 4 5 6 7 8 9 10 11 12

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Bosch GREENSTAR II HE OIL 12/22 Operations Instructions Page 5

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