23
Grant Vortex Oil Boilers
4 - GENERAL BOILER INFORMATION
All models
To avoid the danger of dirt and foreign matter entering
the boiler the complete heating system should be
thoroughly flushed out - before the boiler is connected
and then again after the system has been heated and is
still hot. This is especially important where the boiler
is used on an old system.
For optimum performance after installation, this boiler and its
associated central heating system must be flushed in accordance
with the guidelines given in BS 7593:1992 'Treatment of water
in domestic hot water central heating systems'.
This must involve the use of a proprietary cleaner,
such as BetzDearborn's Sentinel X300 or X400, or
Fernox Restorer. Full instructions are supplied with the
products, but for immediate information, please
contact BetzDearborn on 0151 4209563 or Fernox on
0179 9550811.
For Long term protection against corrosion and scale,
after flushing, it is recommended that an inhibitor such as
Betzdearborn's Sentinel X100 or Fernox MB-1 is dosed
in accordance with the guidelines given in BS 7593:1992.
Failure to implement the guidelines will invalidate the
warranty.
Fig. 12a - View with rear panel removed - 15/26 models only
Sealed systems
4.13
See Fig. 13
1
All Grant Vortex boilers are suitable for use with
sealed systems 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.
3
The expansion vessel can be fitted in either the
return or flow pipework in any of the
recommended positions as shown in Fig. 13. 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.
