Heatrae Sadia ElectroMax Installation & Servicing Instructions Manual page 23

Circuit
in accordance with BS 7593 and the
manufacturer's instructions supplied
b. Connect the Primary Filling Loop and
tighten connections (see Diagram
15).
c. Check all radiator valves are in the
open position.
d. Open the Filling Loop isolating valves
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
system connection point.
Valves
a. Slowly manually open, for a few
seconds, the Temperature and Pressure
Relief Valve on the Electromax (see
Diagram 16). Check water discharged
runs freely away through the tundish
and discharge pipework. Close valve,
reseats correctly.
Primary
Flow Pipe
Temperature /
Pressure
Relief Valve
Tundish
Diagram 16 Safety Valve
and Tundish Positions
b. Repeat the above steps for the
Expansion Valve situated on the
Cold water Combination Valve (see
Diagram 17)
EXPANSION VALVE
COLD MAINS
CONNECTION
(22mm)
PRESSURE
REDUCING
VALVE
HOUSING
Water Combination
Valve
c. Repeat the above steps for the
Primary System Pressure Relief Valve
on the Electromax (see Diagram 16).
After this operation check that the
primary system pressure has not
dropped below 1.0 bar. If it has re-
the gauge reads between 1.0 and 1.5
bar. Always close Filling Loop isolating
valves and remove hose from the
primary system.
Installation & Servicing Instructions
Primary Pressure
Relief Valve
Discharge
Pipe
EXPANSION VALVE
OUTLET (15mm)
OUTLET
CONNECTION
(22mm)
PRESSURE
REDUCING
VALVE
CARTRIDGE (3.5 bar)
23