LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 53)

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Service Manual - NeoTherm 500
5. Behind the gas valve, locate the black rubber air
intake hose. Loosen the hose clamp on the left end
of this hose, and pull the end of the hose away from
the end of the Venturi. When you have finished this
step, the unit will look like Fig. B23-3.
6. Disconnect the wires to the blower. There are two
connectors. See Fig. B23-4. The power wires run to
the rear connector, and the control wires connect to
the front.
7. The next job is to separate the front plate on the
heat exchanger from the rest of the unit. See Fig.
B23-5.
Note the two large wires running to this assembly.
The spark wire and the flame sense wire look alike.
The unit will not run if you reverse these wires.
Before removing the wires, mark the spark wire with
a piece of electrical tape. Also disconnect the green
ground wire.
B23-3 - Gas and air intakes disconnected
Fig. B23-4 - Wiring connectors for blower
Control Power
Fig. B23-5 - Disconnect the wires on the front plate of the
heat exchanger
Ground wire
(green)
Spark wire - mark with
electrical tape
Flame sense
wire
B23
cont.
Removing and Replacing the Blower (continued)