LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 77)

67 Service Manual - NeoTherm 500
Cleaning the Burner and Heat Exchanger (continued)
C5
cont.
6. Disconnect the wires to the blower. See Fig. C5-5.
There are two connectors. The power wires run to
the front connector, and the control wires connect to
the rear.
7. The next job is to separate the front plate on the
heat exchanger from the rest of the unit. See Fig.
C5-6. Note the two large wires running to this as-
sembly. 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 dis-
connect the green ground wire.
Ground wire
(green)
Spark wire - mark with
electrical tape
Flame sense
wire
Power
Control
Fig. C5-5 - Wiring connectors for blower
Fig. C5-6 - Disconnect the wires on the front plate of the
heat exchanger