8) Boiler Primary Heat Exchanger
Insulated steel Heat Exchanger with combustion chamber and access cover at front for servicing.
9) Three Port Motorised Valve
Normally open to Storage Tank.
When heating is in demanding the valve diverts hot water to the radiators.
When hot water is demanded the supply to the radiators is closed.
10) Flow Switch
When a hot water tap is opened to discharge at least 2.5 litres/min, the flow switch energises other controls to
divert stored hot water to the plate heat exchanger.
11) Plate Heat Exchanger
Uses the stored heated water to quickly produce domestic hot water.
12) Filling Loop
The filling loop is supplied for filling and topping up the system.
THE FILLING LOOP MUST BE DISCONNECTED FROM ONE OF THE FITTINGS WHEN NOT IN USE
Page 15
4:7 THE DOMESTIC HOT WATER SYSTEM
The mains supply pressure should be between 1.0 and 10 bar, however reference should be made to Fig 3c
in section 3:8 to obtain the correct working pressure. This may require an approved pressure-reducing
regulator to be fitted before the inlet valve.
The final 600mm of mains water supply pipe to the Boiler must be copper.
All combination Boilers suffer performance degradation due to the effects of hard water (limescale
build up on heat exchanger surfaces).
Boulter Buderus have taken particular care in the design of this Boiler to minimise this (hard water)
effect but, strongly recommend that in areas where water temporary hardness (alkalinity) in excess of
150mg/I is likely to be encountered, a water conditioner of the chemical dosing type is fitted. Your
local water supply authority should be able to advise on hardness
.
To achieve the flow rates specified at water outlets (taps), pipework over 3m in length from the Boiler must be
dia. 22mm.
For specific information relating to fittings e.g. showers, dishwashers, washing machines etc. suitable for
connection to the Domestic Hot Water circuit, consult the local Water Authority if in doubt.
Domestic hot/cold water supply : All equipment designed for use at mains water pressure are suitable. The
temperature of DHW depends on the water flow from the tap. To obtain a more even temperature a mixing
valve can be fitted.
Page 22 of 57
Installation & maintenance manual for Camray 5 Combi External Boilers
14/04/2005
file://D:\PL61500\PL61500.htm
