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Publication No. 5105703
18
Pumped
Return
Gravity
Return
22mm
28mm
28mm
28mm
Olive
Nut
Injector
Disc
28mm
Gravity
Flow
Pumped
Flow
Pumped
Return
Olive
Injector Disc
Gravity
Return
PRF0023A
2.8.
Connect System Pipework
Connect system pipework to the boiler, compression fittings should be used. Ensure that the flow and return pipes do not
rotate during tightening. The return pipe is marked with an identation, this should face towards the front of the boiler.
If however capillary fittings are used it is essential to temporarily remove the thermostat bulb from the flow pipe before
soldering.
A drain off tap should be installed close to the boiler if it is in a low point of the system.
On combined gravity hot water/pumped central heating installations the flow and return pipes for both the gravity hot water
circuit and pumped central heating circuit must be connected to tees fitted directly to the flow and return pipes on the boiler.
The gravity circuit should be installed in 28 mm copper pipe.
The injector disc (accessory pack H) must be positioned in the pumped return branch of the tee and the pipes connected
to the tees as illustrated in Fig. 20.
Connect the gas supply pipe to the inlet of the gas cock. Ensure that the gas cock is in a position where it can be easily
operated when the controls cover is removed.
Installation
Fig. 20