GENERAL
mini HE --- Installation & Servicing
12
5 BOILER CONTROL INTERLOCKS
Thermostatic radiator valves.
Caradon Ideal Ltd. support the recommendations made by
leading manufacturers of domestic heating controls that
heating systems utilising full thermostatic radiator valve
control of temperature in individual rooms should also be
fitted with a room thermostat controlling the temperature in a
space served by radiators not fitted with such a valve as
stated in BS5449. Such an arrangement will provide for a
more efficient control of the environment and will also avoid
the continuous running of the circulation pump during
programmed heating ON periods, saving electrical energy.
It is therefore strongly recommended that, when thermostatic
radiator valves are used, the space heating temperature
control over a living/dining area or a hallway, having a heat
requirement of at least 10% of the boiler output, is achieved
using a room thermostat whilst other rooms are individually
controlled by thermostatic radiator valves as stated in
BS5449.
For further information refer to “Good Practise Guide 143” a
publication of the energy efficiency office, available from the
building research establishment Garston Watford WD2 7JR
tel: +44 (0) 1923 664258
The boiler is fitted with an automatic internal bypass. No
further system bypass is required.
Typical installation
D
A
TRV
B
Room
T/stat
Balancing valve
TRV
TRV
6 DOMESTIC HOT WATER
REQUIREMENTS
1 The domestic hot water service must be in accordance
with BS 5546 and BS 6700.
2 For the minimum and maximum working pressures of the
mini HE C24 and mini HE C28 domestic hot water circuit
refer to Table 1, page 4.
3 The cold water supply pipe should be flushed before
fitting the boiler.
4 The boilers are suitable for connection to most types of
washing machine and dishwashing appliances.
5 When connecting to suitable showers, i.e. those designed
for modulating domestic hot water, ensure that:
a. The cold inlet to the boiler is fitted with an approved
anti---vacuum or syphon non---return valve.
b. Hot and cold supplies are of equal pressure.
6 Hard water areas
In areas where the water is ’hard’ it is recommended that
a proprietary scale---reducing device is fitted into the boiler
cold supply, within the requirements of the local water
company.
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