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Operation
Separated Combustion Tubular Propeller
Units - Direct Spark Ignition
Explanation Of Controls
1. The unit heater is equipped with a power vent system
that consists of a power venter motor and blower,
pressure switch, and sealed flue collector in place of
the conventional draft diverter.
2. The power venter motor is energized by the room
thermostat through the integrated control board when
a demand for heat is sensed. The pressure switch
measures the flow through the vent system and
energizes the direct spark ignition system beginning
the pre-purge timing when the flow is correct.
WARNING
The pressure switch MUST NOT be bypassed. The unit
MUST NOT be fired unless the power venter is
operating. An unsafe condition could result.
3. The direct ignition system consists of an ignition
control module and a gas valve. When the pre-purge
period ends, the spark ignition system is energized,
and the gas valve opens to supply gas to the burners.
When the thermostat is satisfied, the vent system is de-
energized and the valve closes to stop the flow of gas
to the unit.
4. The limit switch interrupts the flow of electric current
to the control board, interrupting the flow of gas to the
gas valve if the unit heater becomes overheated.
5. Once the thermostat is satisfied, or the limit switch
interrupts the flow of electric current to the control
board, the unit will begin a post-purge period. When
the post-purge period ends, the power venter motor is
de-energized.
6. The fan operation is delayed 30 seconds once the
thermostat is closed, and continues operation for 30
seconds after the thermostat opens.
NOTICE
The start-up fan delay must not exceed 30 seconds
from a cold start.
7. The wall thermostat, supplied optionally, is a
temperature sensitive switch that operates the vent
and ignition system to control the temperature of the
space being heated. The thermostat must be mounted
on a vertical, vibration-free surface free from air
currents and in accordance with the furnished
instructions (also refer to Electrical Section).
24
Start-Up (Also refer to lighting instruction
plate equipped on the unit)
1. Open the manual gas valve in the gas supply line to the
unit heater. Loosen the union in the gas line to purge
it of air. Tighten the union and check for leaks.
WARNING
Never use an open flame to detect gas leaks. Explosive
conditions may exist which could result in personal
injury or death.
2. Open the manual valve on the unit heater.
3. Turn ON the electrical power.
4. The unit should be under the control of the thermostat.
Turn the thermostat to the highest point and determine
that the power venter motor starts and the burners
ignite. Turn the thermostat to the lowest point and
determine that the power venter motor shuts off and
the burners are extinguished.
5. Turn the thermostat to the desired position. See Gas
Input Rate and Adjustments sections.
Shut Down
1. Turn the valve selector lever to the "OFF" position.
2. Turn off the electricity.
3. To relight, follow "start-up" instructions.
See
Figure 17
-
Figure 23
Figure 17. Direct spark ignition system, bottom view
Primary Air Shutter Adjustment
Primary air adjustment is made at the factory. No field
adjustments are necessary.
for parts/identification.
GANE-SVX001B-EN
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