Installation 7
0020289288_02 MicraCom Installation and maintenance instructions
19
5.
Refill the heating system with water.
6.
Check that the expansion relief valve of the heating
system is functioning correctly by turning the handle
on the valve.
7.
Check the pressure in the heating system and top up
with water if necessary.
8.
Close the filling valve and the cold water tap.
7.3
Connecting gas and water
1.
Install the gas pipe on the gas connection such that it is
free from mechanical stress.
2.
Purge the gas pipe before start-up.
3.
Check the entire gas pipe properly for leak-tightness.
4.
Install the water flows and returns in accordance with
the relevant standards.
7.4
Connecting the condensate discharge hose
Danger!
Risk of death from escaping flue gases!
The siphon's condensate discharge hose
must not be tightly connected to waste-water
pipework because, otherwise, the internal
condensate siphon may be drained fully and
flue gas may escape.
▶
Have the condensate discharge hose end
outside of the waste-water pipework.
A
B
1.
Follow the instructions listed here and observe the legal
and local regulations on condensate discharge.
2.
Use only pipes made of acid-resistant material (e.g.
plastic) for the condensate discharge pipe (e.g. plastic).
3.
If you cannot guarantee that the materials from which
the condensate discharge pipe is made are suitable,
install a system to neutralise the condensate.
7.5
Condensate discharge systems
The condensate is discharged periodically in ‘slugs’ by si-
phonic action. It is not necessary to provide extra traps in the
discharge pipe as there is already a 75 mm high trap inside
the boiler. Fitting an extra trap may cause the boiler siphon
to work incorrectly. Refer to BS5546 or BS6798 for further
advice on disposal of boiler condensate.
7.5.1
Direct Connection to internal soil and vent
stack
Ø22mm
Preferred option
7.5.2
Direct connection to external soil and vent
stack
Ø22mm
Ø 32mm
≤ 3 m
7.5.3
External termination to gulley or hopper
Ø22mm
Ø 32mm
≤ 3 m
Best practice