Baxi Bermuda 45/4 M Installation And Servicing Instructions page 8

SYSTEM DETAILS - Page 8
Overheat Kit And Sealed Systems
An overheat thermostat modification kit is available to
facilitate the installation of a Bermuda 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.)
o
Baxi Part N 235565 for Electronic Controls
o
Baxi Part N 234885 for Manual Controls
The boiler can be applied to a sealed system with the
use of the overheat kit.
Information regarding the application of the overheat
thermostat is included with the kit.
Storage Systems
For information regarding the use of a Bermuda boiler with.a
storage system, contact the appropriate storage system
manufacturer.
Pumped Heating & Gravity Hot Water
The sizes of system pipes should be determined by normal
methods (BS 5449). 28mm pipe is recommended for the
gravity circuits.
The gravity flow pipe should rise vertically as close as
possible to the boiler, avoiding sharp bends and tight
elbows.
The open vent pipe should be a minimum of 22mm and must
rise continuously to a point above the feed and expansion
tank.
The flow pipe from the boiler may form part of the vent pipe.
No part of the open vent should contain a valve.
The cold feed pipe (15mm mm) should be connected to the
boiler return pipework.
The brass injector tee must be fitted to the boiler return
on all systems incorporating a gravity circuit.
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.
The gravity circuit should be designed with a minimum of
restriction, avoiding possible air traps and long horizontal
runs.
The system should be designed to prevent gravity circulation
in the heating system when the pump is not running.