Supplied By www.heating spares.co Tel. 0161 620 6677
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INTRODUCTION
Your Vokera Option is a combination boiler supplying
central heating and instantaneous domestic hot water.
Features included are an integral time clock, LED indica-
tors showing the status of the appliance and system
pressure, 2-stage frost protection and anti-pump seize
function.
GAS SAFETY (Installation and Use) REGULATIONS
In the interests of your safety and that of others, it is a legal
requirement that all gas appliances are installed and
correctly maintained by a competent person and in ac-
cordance with the latest regulations.
ELECTRICAL SUPPLY
Please ensure that this appliance has been properly
connected to the electrical supply by means of a double
pole isolator or un-switched socket and that the correct
size of fuse – 3 AMP – has been fitted.
Warning: this appliance must be earthed!
EXPLANATION OF CONTROLS
The Vokera Option has been designed for simplicity of
use, as a result there are only two controls – the mode
selector switch & the time clock – that can be accessed
by the user.
MODE SELECTOR SWITCH AT:
OFF “O”, when the mode selector switch is in the ‘OFF’
position, the appliance will not function for hot water or
heating. However the appliance will still operate in frost
protection mode, and if unused for a period of 24 hours,
will momentarily activate the pump to prevent seizure due
to non-use.
Note; the appliance must have an electrical supply at all
times for the frost protection and anti-seize modes to
operate.
HOT WATER ONLY “
”, when the mode selector
switch is in the ‘HOT WATER ONLY’ position, the appli-
ance will operate as above. However when a hot water
outlet is opened the appliance will operate to provide hot
water until the demand for hot water has been satisfied.
Note; the appliance delivers a fixed maximum flow rate of
hot water, therefore if a hot water outlet is turned on full,
it is most likely that you will be unable to obtain hot water
from another outlet at the same time.
HEATING AND HOT WATER “
”, when the
mode selector switch is in the ‘HEATING AND HOT
WATER’ position the appliance will operate as above.
However should the time clock be switched on automati-
cally or manually, the appliance will operate to provide
heat to the central heating circuit until the demand has
been satisfied.
Note; if a room thermostat is fitted it must be calling for
heat before the appliance will operate.
TIME CLOCK
The Vokera Option is supplied with a built-in, 24-hour,
time clock that can be set to operate the appliance for
central heating. However it may be that your installer has
fitted an external time clock, (usually because of the
location of the appliance i.e. loft, basement, outhouse,
etc.) if so, please disregard the following instructions and
refer to those supplied with the external time clock.
ON period
OFF period
Selector
switch
Setting the time
The time of day can be set by grasping the outer edge of
the black dial and turning it in a clockwise direction until
the correct time is in line with the white pointer.
Setting the ‘switching times’
The ‘ON’ periods are set by sliding the black tappets,
adjacent to the time periods required, to the outer edge
of the dial.
The tappets that remain at the centre of the dial will be the
‘OFF’ periods.
The smallest switching time (ON or OFF) is 15 minutes.
To select ‘Timed’ mode move the selector switch in the
middle of the clock face to the ‘ ‘ position.
To select ‘Constant’ mode move the selector switch in
the middle of the clock face to the ‘I’ position.
To select ‘Off’ mode move the selector switch in the
middle of the clock face to the ‘O’ position.
Fig. 2
