LG AR-DR11-08A Installation And Operation Manual page 37

GAS HEATER CONNECTION AND STARTUP
Failure to Ignite
1. On the initial start-up, or after furnace has been off for a long period, the first ignition trial may be unsuccessful due to need to purge air
from manifold at start-up.
2. If ignition does not occur on the first trial, the gas and spark are shut-off by the ignition control and the control enters an inter-purge period
of 15 seconds, during which the draft inducer continues to run.
3. At the end of the inter-purge period, another trial for ignition will be initiated.
4. Furnace controller will initiate up to three ignition trials on a call for heat before lockout of control occurs.
5. Furnace controller can be brought out of lockout by turning unit controller to its lowest discharge air set-point (no call for heat) and waiting
five (5) seconds and then turning back up to call for heat. Furnace controller will automatically reset after one hour and initiate a call for
heat.
Manifold Pressure Adjustment
A pressure tap is provided in each furnace module manifold for measuring the gas manifold pressure. Manifold pressure must be checked at
start-up and during any service or maintenance. All systems require a manifold pressure of 3.40 to 3.50 in. w.c. at maximum input on natural
gas, and 10.0 in. w.c. on propane gas at rated input. See figures below for gas valve adjustment locations.
Figure 44: VR8305Q Gas Valve.
Figure 46: V8944 Gas Valve.
Manifold Pressure
Adjustment.
Remove Brass
cap and adjust
with plastic screw.
Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 45: 36H Gas Valve.
Manifold Pressure
Adjustment.
Remove Brass
cap and adjust
with plastic screw.
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