5.2.7 Showers
If a shower control is supplied from the appliance it should be of the ther
mostatic or pressure balanced type. Thermostatic type shower valves pro
vide the best comfort and guard against water at too high a temperature.
Existing controls may not be suitable - refer to the shower valve manufac
turer.
5.2.8 Expansion vessel (CH only)
The appliance expansion vessel is pre-charged to 1.0 bar. Therefore, the
minimum cold fill pressure is 1.0 bar. The vessel is suitable for correct op
eration for system capacities up to 100 litres. For greater system capaci
ties an additional expansion vessel must be fitted.
For GB refer to BS 7074 Pt 1. For IE, the current edition of IS 813 Domes
tic Gas Installations.
Checking the charge pressure of the vessel - to check the charge accu
rately ensure the system is cold. It is also necessary to relieve the pres
sure by draining the boiler. Using a suitable gauge check the pressure at
the valve on the underside of the vessel. Adjust the pressure as required
and repressurise the system.
5.2.9 Safety pressure relief valve
1
2
A
Discharge pipe
Pressure relief valve & drain
The end of the pipe should terminate facing down and towards the
wall
See
BS 6798 for full details.
The pressure relief valve is set at 3 bar, therefore all pipework, fittings,
etc. should be suitable for pressures in excess of 3 bar and temperature in
excess of 100 °C.
The pressure relief discharge pipe should be not less than 15 mm diame-
ter, run continuously downward, and discharge outside the building, pref-
erably over a drain. It should be routed in such a manner that no hazard
occurs to occupants or causes damage to wiring or electrical components.
If it is anticipated that any part of the pipe may be subject to freezing it
should be suitably insulated. The end of the pipe should terminate facing
down and towards the wall.
The discharge must not be above a window, entrance or other public ac-
cess. Consideration must be given to the possibility that boiling water/
steam could discharge from the pipe.
Important
The relief valve can be used as a drain.
A remote relief valve kit is available to enable the boiler to be installed in
cellars or similar locations below outside ground level.
Fig.10 Discharge pipe
1
A
A boiler discharge pump is available which will dispose of both condensate
& high temperature water from the relief valve. It has a maximum head of
5 metres.
Important
Failure to flush and add inhibitor to the system will invalidate the
appliance warranty.
It is important to check the inhibitor concentration after installation, system
modification and at every service in accordance with the inhibitor
manufacturer. (Test kits are available from inhibitor stockists.)
For information or advice regarding any of the above contact Baxi
Customer Support 0344 871 1545.
5 Before installation
24 600 Combi 2
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