Potterton PRIMA 30C User Manual page 16

INSTALLATION INSTRUCTIONS - Page 16
Figure 11 PIPE CONNECTIONS
Connect the system pipework to the boiler, compression
fittings are recommended. 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 circuits must be
connected to tees fitted directly to the flow and return pipes
on the boiler.
The gravity circuit should be installed in 28mm copper pipe.
28mm tees should be used.
The injector disc (accessory pack G) must be positioned in
the pumped return branch of the tee as illustrated in Figs 11
& 11B.
Remove gas service cock from the auxilliary pack and attach
it to the union nut on the inlet to the gas assembly.
With the inlet connection of the gas service cock facing the
rear, connect the gas supply pipe.
Figure 11B WARNING: UNDER NO
CIRCUMSTANCES SHOULD A
'REDUCING SET' BE FITTED
NOTE
The boiler is despatched with the overheat
Thermostat bulb positioned for FULLY PUMPED OPEN
VENTED OR SEALED SYSTEMS.
ONLY if the boiler is to be used on a GRAVITY DHW system
should the bulb of the overheat thermostat be repositioned
as described below, to prevent nuisance operation of the
overheat thermostat.
Remove clip securing overheat thermostat bulb to the flow
pipe.
Uncoil the thermostat capillary and route it through the two
retaining clips attached to the front flange on the top panel.
Position the thermostat bulb in the indent in the return pipe
and secure in this position using the clip previously removed.
16
Figure 12