Potterton LPG 50e Installation And Servicing Manual page 15

INSTALLATION INSTRUCTIONS - Page 15
FIG. 19 LOCATION OF PRESSURE
SENSING TUBES
Slide the flue elbow into the flue duct and locate the flange
over the studs on the fluehood ensuring that the sealing
gasket is in place. Secure the elbow to fluehood using the
four brass securing nuts. Reconnect flexible tubes to elbow.
ENSURE THEY ARE NOT KINKED. NOTE: Red tube
connects the front aluminium tube in upper chamber to the
lower connection on elbow, each being identified with a red
ring.
FIG. 20B
WARNING: UNDER NO CIRCUMSTANCES SHOULD A 'REDUCING SET' BE FITTED
FIG 20. PIPE CONNECTIONS
Connect system pipework to the boiler, compression fittings
should be used. 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 28mm tees fitted directly to the flow and return
pipes on the boiler.
The gravity circuit should be installed in 28mm copper pipe.
The larger injector disc provided in accessory pack H must
be positioned in the pumped return branch of the tee and
the pipes connected to the tees as illustrated in Figs. 20 and
20B. The small injector disc should be discarded.
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.