Filling The Sealed System Primary Circuit; Check The Operation Of The Safety Valves - Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual

7.2 Filling The Sealed System Primary
Circuit
(a) The primary system must be flushed
in accordance with BS 7593 and the
manufacturer's instructions supplied with
the flushing agent selected.
(b) Connect the primary filling loop and tighten
connections (see diagram 15, page 23).
(c) Check all radiator valves are in the open
position.
(d) Open the filling loop isolating valves
and allow primary system to fill until
the pressure gauge on the fascia of the
Electromax reads approx. 2.0 bar.
(e) Purge air from all radiators and air vent
points in the primary system.
(f) Check the primary system pressure. This
should be between 1.0 and 1.5 bar. If
lower, open filling loop isolating valves
until gauge reads approx. 2.0 bar. Repeat
air purging operation. This sequence may
need to be repeated several times to
ensure all air is purged from the system.
(g) Check primary system for leaks and rectify
as necessary.
(h) When the pressure gauge remains steady
at between 1.0 and 1.5 bar ensure both
filling loop isolating valves are closed and
remove filling loop flexible hose from the
primary system connection point.
7.3 Check The Operation of the Safety
Valves
(a) Slowly manually open, for a few seconds,
the temperature and pressure relief Valve
on the Electromax (see diagram 16, page
24). Check water discharged runs freely
away through the tundish and discharge
pipework. Close valve, ensure water flow
stops and valve reseats correctly.
(b) Repeat the above steps for the expansion
valve situated
combination valve (see diagram 17, page
24)
(c) Repeat the above steps for the primary
system pressure relief valve on the
Electromax (see diagram 16, page 24).
After this operation check that the primary
24 Installation & Servicing Instructions
on the cold water
Primary
Flow Pipe
Temperature/
Pressure
Relief Valve
Tundish
Discharge Pipe (not supplied)
Diagram 16 Safety Valve & Tundish Positions
Expansion valve
Cold mains
connection
(22mm)
Diagram 17 Cold Water Combination Valve
system pressure has not dropped below
1.0 bar. If it has re-connect the filling loop
and refill until the gauge reads between
1.0 and 1.5 bar. Always close filling loop
isolating valves and remove hose from the
primary system.
Primary Pressure
Relief Valve
Expansion valve
outlet (15mm)
Outlet connection
(22mm)
Pressure reducing
valve cartridge
(3.5bar)