3
Gas valve replacement
Logamax plus GB162-80 kW/100 kW - We reserve the right to make any changes due to technical modifications!
7
B Remove the seal from the gas pipe and install a new
seal (Æ fig. 11).
Fig. 11 Installing a new seal on the gas pipe
B Refit all parts in reverse order. When re-installing the
burner plate, make sure that the notch is on the right-
hand side (Æ fig. 12).
B Carry out the start-up activities and complete a new
start-up report.
B Also check all joints and gaskets affected by the
installation activities while carrying out the tightness
test in operating conditions.
B Close the boiler door and lock the fastener by turning
the vent key through ¼ rotation in a clockwise
direction.
Fig. 12 Re-installing the burner plate
3.1 Testing for gas leaks
Prior to start-up of the boiler you must check the external
tightness of the gas supply valve and confirm this in the
start-up report.
B Disconnect the heating system from the power supply.
B 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).
B Check the input rates after to the values on the front
page.
3.2 Inlet gas pressure
B Open at least one thermostatic radiator valve if present
to allow water to flow through the boiler. Do not switch
on the boiler.
B Close the gas shut-off valve. Loosen the screw plug on
the inlet gas pressure testing nipple by two turns
(Æ fig. 13, [1]).
B Connect the pressure gauge connection hose to the
testing nipple (Æ fig. 13, [2]).
B Slowly open the gas shut-off valve.
The boiler and its individual shutoff valve must be
disconnected 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).
The boiler must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 60 inch
W.C. (150 mbar).
6720615033-015.1TD
6720615033-016.1TD
CAUTION:
due to a short circuit.
B Cover damageable parts before leak
testing.
B 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.
B Carry out a proper leak test.
B Only use approved leak detection agents
for leak detection.
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