Baxi Bermuda 45/4 M Installation And Servicing Instructions page 16

INSTALLATION - Page 16
Pumped Heating & Gravity Hot Water
A 1in x 22mm threaded adaptor, two compression nuts and
olives and a brass injector tee piece are provided in the kit
for the return connection.
NOTE: The injector tee must be fitted to the return of all
systems with gravity domestic hot water.
Fit the 1in x 22mm threaded adaptor into the lower tapping
marked RETURN.
Fit the injector tee into the adaptor. The injector tee may be
oriented as shown to facilitate connection to the gravity
return pipework, or 45º either side of the vertically downward
plane.
Connect the pumped return to the 22mm compression fitting
of the injector tee.
Take the gravity hot water return pipe to a level beneath that
of the injector tee and connect upwards to the 28mm branch
of the injector tee, as shown.
Connect the pumped flow to the connection marked FLOW.
Connect the gravity flow to the remaining connection.
The gravity flow pipes must rise vertically as close as
Pumped Heating
possible to the appliance. Ensure the pipework is routed
Gravity D.H.W.
such that it does not introduce an airlock in the boiler.
Follow the instructions under 'System Details' regarding the
vent pipe and cold feed.
Gas Connection
Connection to the gas supply is Rc ½ (½in BSPT) internal
located at the rear of the gas cock.