Replacing The Gas Valve - Buderus Logamax plus GB162-80 kW Service Instructions Manual

section 113 Replacing the gas valve
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DANGER OF FATAL ACCIDENT/FIRE
from explosive fumes.
All work on gas pipe work and fittings must be carried out
by authorized gas technicians.
 While carrying out these activities check all sealing
rings and gaskets for damage, deformation and signs of
ageing and replace if required.
 After carrying out these activities, check the system for
leaks on the gas side and/or the flue gas side.
 After carrying out these activities check the measuring
nipples used for leaks using a foaming agent which has
been approved for gas leak testing.
 Switch off the power supply to the heating system, see
section 72.
 Open the boiler door and remove the casing of the pump
group as instructed in section 73.
 Close the gas stop valve as indicated in section 74.
 Disassemble the gas valve as indicated in section 86.
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 100 kW: Loosen the 4 torx screws [1] and remove the gas
valve [2] from the venturi pipe [3].
 Install a new O-ring [1] in the venturi pipe.
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
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 Install the orifice [1] in the venturi pipe.
 Install the new gas valve on the venturi pipe in reverse order,
as instructed before.
 If necessary, replace the gasket between the fan unit and the
venturi pipe as instructed in section 86.
 Install the new gas valve including the venturi pipe on the fan
unit in reverse order, as instructed before.
 Check the rubber seal [1] for signs of ageing and damage and
replace it if necessary.
 Install the gas/air unit including the burner cover in reverse
order of removal as instructed in section 86.
 Install the air suction pipe on the venturi pipe in reverse order,
as instructed in section 86.
 Connect the plug of the fan unit power supply cord and the
plug of the fan unit tacho cable in reverse order as instructed
in section 86.
 Attach the gas valve plug or plugs in reverse order of removal
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as instructed in section 86.
CAUTION!
While connecting the gas pipe to the gas valve make sure
that the rubber seal is fitted between the gas pipe and the
gas valve.
 Connect the gas pipe to the gas valve in reverse order as
instructed in section 86.
 Open the gas stop valve as indicated in section 81.
 Switch on the power supply to the heating system, see
section 79.
 Check the gas/air ratio and adjust it if necesaary, see
section 119.
 Close the boiler door as instructed in section 91.
Actions
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