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Modulating Unitary Range
VA-LT206_11292016al
Starting Sequence of Operation
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Turn the thermostat up. When the thermostat calls for heat, both blower motors will energize
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After the blower is running, the air-proving switch closes and activates the ignition module.
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The ignition module, after a pre-purge period of approximately 30 seconds, energizes the igniter. Then,
the gas valve is energized for this ignition trial period of 15 seconds.
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If a flame is detected, the ignition sensing rod “reads” a rectification signal and the gas valve remains
open. The sparking stops when the flame signal is established.
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If no flame is detected, the gas valve closes and a 30 second inter-purge period begins.
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After the inter-purge, the module repeats the trial for an ignition period.
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If a flame is still not established, a third and final inter-purge followed by a final ignition trial cycle
begins. After three trials, the module will lockout for a period of approximately 1 hour or until reset.
(Reset is accomplished by removing power from the module for at least 5 seconds.) After this 1 hour
period, the module re-attempts the full ignition sequence.
When the heat requirement has been met and the thermostat opens, the burner shuts off and the fan continues
to run for approximately 30 seconds. This is referred to as post purge. This allows the products of combustion to
be removed from the heat exchanger to avoid nuisance condensation and increase heat exchanger life.
BURNER OPERATION
Maintenance
For best performance, certain minimal maintenance procedures should be performed before each heating
season:
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Installation environment and best practices should be considered in determining frequency.
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Before performing any services or maintenance, shut off gas and electrical supply to heater.
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Check condition of forced air blower scroll and motor. Dirt and dust may be blown or vacuumed from
the blower.
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Check condition of burner. Remove any foreign objects or debris from inside the burner box or burner
cup.
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Inspect the igniter. Replace igniter if there is excessive wear or erosion, breakage or other defects.
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Be sure the burner observation window is clean and free of cracks or holes. Clean or replace as
necessary.
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Check the flue pipe for soot or dirt and reattach to the heater after cleaning as necessary.
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The reflector sections may be cleaned by wiping with a damp cloth.
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A service agency qualified to adjust and repair infrared heaters should be engaged for service other
than routine maintenance.
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Be sure vent terminal and fresh air inlet are free from obstructions. If either pipe is restricted, the safety
air switch will not operate properly, and the heater could fail to operate.
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Check the inside of the radiant tubes visually with a flashlight. If carbon or scale are present, scrape or
otherwise remove deposits (a wire brush works well)
Содержание VA Range
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