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6
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.
Summary of Contents for BoilerhouseB70HE
Page 13: ...4 5 2 U Series Utility Casing Components Models up to 120 HE 150 HE Models Page 11...
Page 14: ...4 5 3 U Series Utility Pre Wired UHE Key Components Models up to 120 HE 150 HE Models Page 12...
Page 15: ...4 5 4 U Series Utility Pumped UPHE Key Components Models up to 120 HE 150 HE Models Page 13...
Page 17: ...4 5 7 K Series Kabin Pak Casing Components Models up to 120 HE 150 HE Models Page 15...
Page 19: ...4 5 9 K Series Kabin Pak Pumped KPHE Key Components Models up to 120 HE 150 HE Models Page 17...
Page 22: ...Page 20 4 5 13 Combi Pipe Layout UCHE KCHE Models...
Page 23: ...Page 21 5 TECHNICAL DETAILS 5 1 Combi Sequence of Operation Flow Chart...
Page 25: ...Page 23 5 2 3 U Series Utility 150HE Models 5 2 4 U Series Utility UCHE Models...
Page 27: ...Page 25 5 2 7 K Series Kabin Pak 150HE Models 5 2 8 K Series Kabin Pak Base Tray 150HE Models...
Page 28: ...Page 26 5 2 9 K Series Kabin Pak KCHE Models 5 2 10 K Series Kabin Pak Base Tray KCHE Models...
Page 41: ...Page 39 6 3 2 Wiring Schematic...
Page 66: ...Page 64 8 1 10 Kabin Pak Plume Management Kit KPMK The kit comprises...
Page 78: ...Page 76 13 BURNER FAULT FINDING 13 1 Riello RDB...
Page 79: ...Page 77 14 COMBI FAULT FINDING 14 1 Central Heating...
Page 80: ...Page 78 14 2 Domestic Hot Water...
Page 91: ......