Open Vented Fully Pumped System; Cylinder; Method Of Make-Up; Mains Connection - Potterton Profile 30e Installation And Servicing Instructions

SITE REQUIREMENTS - Page 9
If the system is extended, the expansion vessel volume may
have to be increased unless previous provision has been
made for the extension. Where a vessel of the calculated
size is not available, the next available larger size should be
used.
The boiler flow temperature is controlled at approximately
0
82 C.
The vessel size can now be determined from the following
table where V=System volume in litres.
Vessel Charge Pressure(bar)
Initial System Pressure (bar)
Expansion Vessel Volume (litres)

Cylinder

The hot water cylinder must be an indirect coil type or a
direct cylinder fitted with an immersion calorifier suitable for
operating at a gauge pressure of 0.3 bar (51 bf/in
excess of safety valve setting. Single feed indirect cylinders
are not suitable for sealed systems.
FIG. 6 OPEN VENTED FULLY PUMPED SYSTEM
FITTED WITH A COMBINED FEED AND VENT
Supplied By www.heating spares.co Tel. 0161 620 6677

Method of Make-Up

Provision shall be made for replacing water loss from the
system either:—
i)
ii)
0.5 1.0
1.0 1.0

Mains Connection

V x 0.11 V x 0.087 There shall be no connection to the mains water supply or
to the water storage tank which supplies domestic water
even through a non-return valve, without the approval of the
local Water Authority.
Filling Point
2
) in The system shall be fitted with a filling point at low level
which incorporates a stop valve to BS1 010 and a double
check valve (approved by the National Water Council) to be
fitted in this order from the system mains, Refer to FIG. 7.
Method 1.
from a make-up vessel or tank mounted in a position
higher than the top point of the system, and connected
through a non-return valve to the system on the return
side of hot water cylinder or the return side of all heat
emitters.
or
where access to a make-up vessel would be difficult by
using the mains top up method or a remote automatic
pressurisation and make-up unit as illustrated in FIG. 7
METHODS 1 and 2.