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3 BEFORE FITTING A COMBI BOILER THE INSTALLER MUST
CHECK:
1. What the maximum hot water demand placed on the boiler is likely to be. Not
every installation is suitable for a Combi boiler. Systems requiring very high hot
water flow rates may be better suited with a Warmflow unvented cylinder.
2. That the mains are capable of supplying up to 24 litre/min with a minimum
dynamic pressure of 1.8 bar at the boiler. This is to ensure that the boiler can
achieve its maximum output. To protect the appliance and to prevent excessive
flow rates, a pressure reducing valve must be fitted to limit the maximum supply
pressure to 3 bar.
3. Where the mains water pressure is supplied via a borehole pump and
accumulator the pressure variation must not affect the thermostatic mixer valve.
Contact Warmflow for further details.
4. The hardness of the mains water supply. Systems with hard water must be
fitted with a suitable chemical scale preventer (e.g. Fernox Quantomat or
Combimate).
5. That the flow from any one hot water outlet does not exceed the maximum
recommended. This applies particularly to baths which are usually fitted with
larger taps and larger bore supply pipes. It may be necessary to restrict the flow to
these taps by reducing the bore of the supply pipework (eg 15mm) or by fitting a
restrictor into the pipework.
6. That any outlet, when opened, does not starve all the other outlets of hot water.
If more than one outlet is open at the same time then the total flow from all the
outlets should not exceed the maximum flow rate of the boiler.
7. That any showers being supplied with hot water by the boiler are compatible
with this type of appliance.
It should be noted that the boiler has been factory fitted with an 18 litre/min flow
restrictor.
The manufacturer‟s guarantees are void if the appliance is not installed and
commissioned in accordance with the recommendations made herein.
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