Instruction manual

DHW
Filling the Cylinder
l Ensure that all fittings and valves are correctly
installed and are water tight
l Flush all debris from the supply pipes before
connecting to the cylinder
l Open the furthest hot water tap from the DUO 55
cylinder
l Open the mains water inlet valve and allow the
cylinder to fill. Allow water to flow from the tap for a
few minutes to ensure any installation debris is
flushed through the system
l Open all other taps in turn to purge any remaining
air from the system
l Check all connections for leaks
Check the operation of the safety valves
l Manually open the temperature and pressure relief
valve (39 Fig. 17) for a few seconds.
l Check that the water flows away through the tundish
and discharge pipework and does not overflow.
l Ensure that the flow of water has stopped and that
the valve has reseated itself.
l Repeat the above check for the expansion relief
valve.
Central Heating
l Open flow and return valves on the boiler (28 & 29
Fig. 18)
l Open the automatic air vent (20 Fig. 19)
l Fill system and vent radiators
l Set system pressure and remove filling loop
l Check for leaks
l Manually check pump is free to turn
l Switch on electrical supply
l Turn selector switch (19 Fig. 20) to heating and hot
water position
l Allow pump to run for several minutes.
l Isolate electrical supply.
l Drain boiler and check water filter (34 Fig. 19) for
installation debris.
l Replace filter and recharge system.
Indirect Heating
l Ensure that the cylinder heating coils are filled and
purged of air.
Fig. 17
1% 28 27 29
Fig. 18
Fig. 19
16
m
--