LAARS NeoTherm NTV (Sizes 150–285 MBTU/h) - Service Manual - Manual (Page 48)

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Service Manual NeoTherm 80 - NeoTherm 285
4. Unplug the wires running to the gas valve. The
connector is keyed, and can only be plugged in one
way. See Fig. B19-3.
5. Disconnect the small vacuum hose running to the
top of the gas valve.
6. Disconnect the wires to the blower. There are two
connectors. The power wires run to the rear con-
nector, and the control wires connect to the front.
See Fig. B19-4.
7. Loosen the left hose clamp on the black rubber air
inlet hose, then pull the left end of the hose away
from the end of the metal inlet assembly. See Fig.
B19-5.
8. The gas inlet pipe runs to the underside of the gas
valve. It is attached by four 3mm socket-head cap
screws, and these are difficult to reach. Figure
B19-6 shows the screws as seen from below the gas
valve.
Use a 3mm Allen wrench to undo these screws. It
will be hard to reach one of the screws. The best tool
for this job is a traditional “L-shaped” Allen wrench,
with one long leg and one short leg. You will be able
to use the short leg to undo that one difficult screw.
Removing and Replacing the Blower (continued)
Fig. B19-3 - Wiring connector for gas valve
Fig. B19-4 - Wiring connections for blower
Control Power
Fig. B19-5 - Loosen the left end of the rubber hose Fig. B19-6 - Four mounting screws for the gas inlet
pipe, viewed from below
Screws
B19
cont.