Fig. 12.3
a Explain the appliance controls.
b Give guidance if the system is to
be shut down for long periods
when freezing is possible.
c Advise that the appliance should
be serviced regularly.
d Explain that the correct
operating position for the 3-way
switch is the down TIMED
position which enables HOT
WATER and HEATING to be
obtained when required. The up
HOT WATER position will
provide 24 hour hot water
availability in the unlikely event
of the programmer failing.
e Explain how to re-start appliance if
red neon indicates lock-out.
f Hand over the User’s
Instructions, Installation
Instructions and completed
log book to the user.
Fig. 12.4 Standard Switch Panel
Fig. 12.5 Programmer Switch Panel
The Central Heating System
Handing Over to
the User
a On programmer model, set the 3-way-switch to
TIMED and commission the programmer by moving
the slider switch (accessible behind the switch
panel) to the right.
Press SELECT HW and SELECT CH buttons (repeat if
necessary) until the indicators align with either ALL DAY
or 24HR, Fig 12.5, and press SET button to align left
hand indicator with RUN.
On standard model move central heating switch to the ‘I’
(on) position, Fig 12.4.
b Check that any connected room thermostat is calling for
heat.
c Note that the central heating pump will not operate until
the storage cylinder contents have reached a
temperature of approximately 60°C. After filling with cold
water, this will normally take between 20 to 25 minutes.
d Wait until the thermal store has reached its normal
temperature of approx 82°C (by temporarily switching
the central heating off again) before balancing the
radiators in the usual way to achieve a temperature drop
of 10° to 15°C.
e Set the room thermostat or programmer according to the
manufacturer’s instructions. On programmer model
press SELECT CH button to align CH indicator with
AUTO and press SELECT HW button to align indicator
with ALL DAY.
f With the thermal store fully heated, check DHW output
temperature is approximately 55-60°C using nearest tap
and a flowrate of approximately 5 l/min. Record inlet and
outlet temperatures in log book.
g Measure hot water flow rate at bath tap (fully open) and
record in log book.
h Refit outer covers and plinth front in reverse order.
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