3 Gas valve replacement
Logamax plus GB162-80 kW/100 kW - We reserve the right to make any changes due to technical modifications!
9
3.1 Testing for gas leaks
Prior to start-up of the boiler you must check the exter-
nal tightness of the gas supply valve and confirm this in
the start-up report.
z Disconnect the heating system from the power
supply.
z Check the exterior tightness of new conduit sections
up to and including the direct sealing point on the
gas burner fitting. The maximum test pressure
allowed on the input of the gas burner fitting is
60
inch W.C. (150 mbar).
z Check the input rates to the values on the front
page.
3.2 Inlet gas pressure
z Open at least one thermostatic radiator valve if
present to allow water to flow through the boiler.
Do not switch on the boiler.
z Close the gas shut-off valve. Loosen the screw plug
on the inlet gas pressure testing nipple by two turns
(fig. 13, pos. 1).
z Connect the pressure gauge connection hose to the
testing nipple
(fig. 13, pos. 2).
z Slowly open the gas shut-off valve.
The boiler and its individual shutoff valve must be dis-
connected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 60
inch W.C. (150 mbar).
WARNING !
– Cover endangered positions before leak
testing.
– Do not spray the leak testing agent onto
cables, plugs or electrical connection
lines. Do not allow it to drip onto them
either.
DANGER !
Leaks may be caused to pipes and screw
connections during commissioning and
maintenance activities.
– Carry out a proper leak test.
– Only use approved leak detection
agents for leak detection.
fig. 13 Measuring the gas supply pressure
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