COMMISSIONING INSTRUCTIONS
TR05A140.B1107
32
RS
M
5.2 Filling the system
Use only a WRAS approved filling loop
for connection and filling of the primary
system. This should be disconnected
when not in use (see Section 4.4.2).
Check the properties of the water supply
and use appropriate treatment agents if
the mains water has a hardness rating
more than 17.5 °Ck.
Use only clean tap water to fill the
system.
Once the water pipes have been connected,
close the gas feed valve and fill the system as
follows:
•
Slacken the air vent valve plug to allow air to
escape from the system (see Figure 28);
•
Open the main domestic water supply valve;
•
Open the external filling loop;
•
Unscrew the pump plug to remove any
trapped air, check that the pump is free then
re-tighten it when water starts to flow out;
•
Unscrew the manual air vent valve located in
the top left hand corner of the primary heat
exchanger until air begins to escape. When
water begins to flow out, screw the valve
tightly closed.
•
Open the air vents on the radiators and
monitor the air evacuation process. When
water starts to flow out of the radiators, close
the air vents;
•
Use the pressure gauge
M
(see Figure 29) to
monitor the system pressure. Close the
external filling loop when the system pressure
reaches 1 bar and check that Error Code
H2O
is NOT displayed on the control panel
display (see Section 3.6);
•
If, after the above operations, there is a
reduction in the system pressure, re-open the
external filling loop until the pressure gauge
reads 1 bar. Check that Error Code
H2O
is
NOT displayed on the control panel display;
•
On completion of filling, ensure that the external filling loop is disconnected.
PUMP PLUG
PUMP
AIR VENT VALVE PLUG
AIR VENT VALVE
Figure 28: Air vent and pump bleed plugs
Figure 29: Pressure gauge and boiler drain
Summary of Contents for GS25A
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