25
4 - GENERAL BOILER INFORMATION
See Fig. 13
iQE sealed system kits, incorporating circulating
pumps are available. See Section 6.6 and 6.7.
1 The boiler is only suitable for use with a sealed system
complying with the requirements of BS
5449. The maximum temperature of the
central heating water is 80°C.
2 The system must be provided with the following
items:-
a Diaphragm expansion vessel complying with
BS 4814.
b Pressure gauge.
c Safety valve.
d Approved method for filling the system.
Refer to BS 7074:1 for further guidance.
Fig. 12 - Water connections and thermostat phial positions
3 The expansion vessel can be fitted in either the
return or flow pipework in any of the
recommended positions as shown in Fig. 12. To
reduce the operating temperature of the
expansion vessel diaphragm, position it below
the pipe to which it is connected. The
expansion vessel may be positioned away
from the system, providing the connecting
pipe is not less than 13 mm diameter.
4 The pressure gauge should have an operating
range of 0 to 4 bar.
5 The safety valve, set to operate at 2.5 bar, should
be fitted in the flow pipework near to the boiler.
The pipework between the safety valve and
boiler must be unrestricted, i.e. no valves. The
safety valve should be connected to a
discharge pipe which will allow the discharge to
be seen, but cannot cause injury to persons or
property.
iQE 15/26
Heating flow Heating return
Thermostat phials
Heating return
Heating flow
iQE 26/35
Thermostat phials
iQE Horizon Internal Oil Boiler
4.12
Sealed system kit
