FireBird Combi 120, Installation Commissioning Servicing & User Instructions

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DOMESTIC HEATING AND HOT WATER
Domestic Hot Water Circuits
The final 600 mm mains water supply should be of copper tube to BS 2871 Part 1. Ensure that any
capillary fittings used are of lead free solder variety. For user comfort the mains pressure at taps
should be between I and 5 bar. If it exceeds this it is advisable to fit a pressure reducing valve
adjusted to reduce pressure to an acceptable level within above range. To ensure user comfort and
satisfaction it may be advisable to discuss foregoing with householder. Where long hot water
supply-pipe runs are used these should be insulated to prevent rapid cooling of residual hot water
after draw off is completed.
If the boiler is fitted in a hard water area check that hardness does not exceed 200 p.p.m. by
testing with a standard test strip. Immerse test strip in flowing tap water for one second. Shake off
excess water. Check strip after approximately fifteen seconds. If three or more zones have changed
colour the water hardness is over 200 p.p.m.
(Read instructions on test strip package ). Fitting
of an in line scale inhibitor is then necessary.
Failure to check water hardness and fit appropriate water softening equipment will result in
scale build up and consequent reduction in water heating performance. Check with local
Water Authority if in doubt.
Hot and Cold taps, mixing valves and fittings must be suitable for operating at mains pressure up
to 10 bar Bidets with the supply of hot and cold mains water are permitted if they are of the
over-rim flushing type and have shrouded outlets which enable them to have temporary hand held
spray attached. Showers of loose headed or flexible type must be fixed so that the head cannot fall
closer than 25 mm above the top edge of the bath to prevent it immersing into the bath water.
Alternatively the shower should have an anti-syphoning device incorporated at the point of the
flexible connections.
Water Flow Regulation
The flow rate of water from individual taps may be affected by any of the following:-
1.
Number of taps in use at one time
2. Cold mains pressure
3. Diameter and length of pipework in the domestic water circuits within the dwelling.
4. Excessive flow from 3/4” bath taps in a house system converted to mains water supply.
It is recommended:-
A.
To ensure that the mains water connection to the appliance is the first connection from
the mains on entering the dwelling.
B. Where flow starvation is encountered that flow restrictors or balancing valves are fitted
at supply outlets.
* The boiler has circulating pumps fitted therefore no other is normally required. They are
factory set at maximum output. This setting should not be altered on the domestic hot
water pump as production of domestic hot water may be adversely affected.
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