Igniter Check; Gas Valve Setting - Nortec GH Series Installation, User & Maintenance Manual

Igniter Check

If the igniter is suspected of being defective then
the following test may be carried out;
1. Ensure that the power and gas is switched off
before servicing.
2. To test the igniter, disconnect the igniter leads
from their terminal connections, one on the
ignition module the other is part of the wire
harness. Keep note of where they attach.
3. Using a multimeter set the Ohm's scale and
place one of the meter leads on one of the
igniter wire ends and the other meter lead on
the end of the other igniter wire.
4. 4. You should obtain a reading between 50 and
300 Ohm's. This indicates the igniter is okay,
otherwise it should be replaced.

Gas Valve Setting

The gas valves used in the GH series humidifier
are negative-pressure-regulated valves. The valve
setting listed on the product rating plate is shown
relative to atmosphere – this setting will always remain
constant. In the direct vent application, the actual
manifold (outlet) pressure of each gas valve will vary
depending on the vent length and on the firing rate.
The table below lists the outlet pressure of the gas
valve under different conditions. This table should be
used as a guide when servicing/troubleshooting the
unit. The actual measured manifold pressure should
fall within the range shown.
Maximum Vent
Length
(70 ft. 21m)
Maximum firing -0.62" w.c.
rate
Minimum firing -0.25" w.c.
rate
Minimum Vent
length
-0.40" w.c.
-0.15" w.c.
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