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3.0
System Details - Page 8
3.6 Overheat Kit & Sealed Systems
1. An overheat thermostat kit is available to facilitate the
installation of a Bermuda Inset 2 boiler to systems
incorporating a combined feed and vent and to flats and
dwellings where the building design prevents the boiler vent
pipe rising continuously to the feed and expansion tank.
(This must not be used on gravity systems.) Baxi Part N°
234885.
2. The boiler can be applied to a sealed system with the use
of the overheat kit.
3. Information regarding the application of the overheat
thermostat is included with the kit.
3.7 Storage Systems
1. For information regarding the use of a Bermuda Inset 2
boiler with a storage system, contact the appropriate storage
system manufacturer.
3.8 Pumped Heating & Gravity Hot Water (Fig. 4)
1. The sizes of system pipes should be determined by
normal methods.
2. The gravity flow pipe should rise vertically as close as
possible to the boiler, avoiding sharp bends and tight
elbows.
3. The open vent pipe should be a minimum of 22mm and
must rise continuously to a point above the feed and
expansion tank.
4. The flow pipe from the boiler may form part of the vent
pipe.
5. No part of the open vent should contain a valve.
6. The brass injector tee must be fitted to the boiler return
on all systems incorporating a gravity circuit.
7. The circulating head should not be less than 1 m (3ft)
with a maximum horizontal run of 3m (10ft) when using
28mm pipes. Smaller pipe sizes and longer horizontal runs
are acceptable with suitably increased circulating heads.
8. The gravity circuit should be designed with a minimum of
restriction, avoiding possible air traps and long horizontal
runs.
9. The system should be designed to prevent gravity
circulation in the heating system when the pump is not
running.
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