Bosch 90 Operations Instructions download pdf (Page 5)

(See Fig. 1.)

(a) Switch on the electrical mains supply to the boiler.

(b) Ensure that any external controls connected to the boiler, such

as a room thermostat, are on a high setting.

position the selectors to ON.

(d) Ensure the switch on the Outdoor control box is in the ‘run’

position.

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

(see Fig. 2: temperature control).

(f) 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.

(g) 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.

Fig. 1. Control Facia

HOW TO START YOUR

BOILER

Overheat

Thermostat

Reset Button

Switch

TEMP

Isolate

mains

supply

before

removing

Burner

or any

electrical

cover.

Bosch Thermotechnik

Te mperature

Control Knob

Serial Number

Label

Side view of

switch in

‘RUN MODE’

RUN

SERVICE

Frost Thermostat

Outdoor Control Box

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

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Bosch 90 Operations Instructions Page 5

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