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INTRODUCTION
Fig.1 General Layout
1 Flue Analysis Test Point
2 Pressure Tube Negative
3 Fan Assembly
4 Heat Exchanger
5 Secondary thermistor
6 Combustion chamber
7 Burner
8 Expansion vessel
9 Water pressure switch
10 Domestic Hot Water Flow Switch
11 Gas Valve
12 Mode selector switch
13 Fault indicator led
14 Timeclock
15 Low pressure indicator led
16 Pressure gauge
17 Safety valve
18 Pump
19 Auto air vent
20 Electrode
21 High limit thermistor
22 Primary thermistor
23 Air chamber (with cover removed)
24 Air pressure switch
25 Auto by pass (fig. 2)
26 Water flow restrictor (fig. 2)
The Vokèra Option is a combined central heating and
domestic hot water appliance. By design, it incorpo-
rates full sequence electronic ignition, circulating pump,
expansion vessel, safety valve, pressure gauge, and
mechanical timeclock.
The appliance is produced as a room sealed boiler,
suitable for wall mounted applications only. It is pro-
vided with a fan powered flue outlet with an annular co-
axial combustion air intake located on the top rear of the
appliance.
The appliance has been designed for use with a sealed
heating system, consequently it is not intended for use
with an open vented system.
The appliance can be used in conjunction with an ‘Y’ or
‘S’ Plan system when stored hot water via an in-direct
cylinder is required.
An automatic range-rating facility is incorporated in the
boiler, which automatically adjusts boiler output to match
the current demand.
Domestic hot water is provided directly, via the bi-
thermic heat exchanger
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