Installation Instructions

41
1. Fit the burner and tighten four screws
A
diagonally.
!
Please note
Tighten screws sufficiently
to prevent the components
being damaged and to ensure
they function correctly.
2. Insert new gasket and tighten the fit-
tings on gas supply pipe
B
.
3.
Plug the venturi extension C into the
fan.
4.
Fit electrical cables to fan motor D,
gas valve
E
and ignition unit
F
.
5. Reopen gas supply and switch on
power supply.
6. Check the gas connections for tight-
ness.
Danger
Escaping gas leads to a risk of
explosion.
Check all fittings for gas tight-
ness.
!
Please note
The use of leak detection
spray can result in incorrect
functions.
Leak detection spray must not
reach electrical contacts or
seal diaphragm openings on
the gas valve.
Checking the diaphragm expansion vessel and system pressure
Note
The diaphragm expansion vessel can
lose some charge pressure over a time
in use. When the boiler heats up, the
pressure gauge will indicate a higher
pressure of 2 or 3 bar. The safety valve
too can respond and discharge excess
pressure.
Check whether the installed diaphragm
expansion vessel is adequate for the
system water volume.
Carry out this test on a cold system.
1. Drain the system or close the cap
valve on the diaphragm expansion
vessel and reduce the pressure until
the pressure gauge indicates "0".
2. If the pre-charge pressure of the dia-
phragm expansion vessel is lower
than the static system pressure, top
up with nitrogen until the pre-charge
pressure is raised by 0.1 to 0.2 bar.
3. Top up with water until the charge
pressure of the cooled system is at
least 1.0 bar and 0.1 to 0.2 bar higher
than the pre-charge pressure of the
diaphragm expansion vessel.
Permiss. operating pressure: 3 bar
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5609 059 GB
Service