17
Grant Vortex External Module
4 - GENERAL BOILER INFORMATION
See Fig. 12
Grant sealed system kits, incorporating circulating
pumps are available. See Section 6.5 and 6.6.
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 75°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. 11 - All models rear view (panel removed)
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.
Fig. 12 Sealed system
Condensate trap
Condensate outlet to drain
Sealing cap must be fitted
Flexible hose from outlet of
condensing heat exchanger
Sealed system kit
4.9
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