Trane Gas Unit Heaters Wartungshandbuch
GTND-SVX01B-EN
39
Start-Up
All Unit Sizes: Operation
Power Vented Propeller Units—Direct
Spark Ignition
Spark Ignition
Explanation of Controls
Note: Refer to figures:
•
Unit sizes 30–120: Refer to
.
•
1.
Each Unit Heater comes 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.
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.
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.
3. The direct spark 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 burner.
Once the thermostat has been satisfied, the vent
system is de-energized, stopping all gas flow to the
unit.
period ends, the spark ignition system is energized,
and the gas valve opens to supply gas to the burner.
Once the thermostat has been satisfied, the vent
system is de-energized, stopping all gas flow 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.
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.
board, the unit will begin a post-purge period. When
the post-purge period ends, the power venter motor is
de-energized.
6. The operation of the fan is delayed for approximately
30 seconds once the thermostat is closed, and
continues operation for approximately 30 seconds
after the thermostat opens.
continues operation for approximately 30 seconds
after the thermostat opens.
Note: 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 systems to control the temperature of the
space being heated.
temperature sensitive switch that operates the vent
and ignition systems to control the temperature of the
space being heated.
Note: The thermostat must be mounted on a vertical,
vibration-free surface, free from air currents,
and in accordance with the furnished
instructions.
and in accordance with the furnished
instructions.
Start-Up (also refer to lighting instruction
plate equipped on the unit)
plate equipped on the unit)
1.
Open the manual gas valve, in the gas supply line to the
unit heater with union connection loose, purge air
from the gas line. Tighten the union and check for
leaks.
unit heater with union connection loose, purge air
from the gas line. Tighten the union and check for
leaks.
2. Open the manual valve on the unit heater.
WARNING
Carbon Monoxide!
Never operate unit heaters if the power venter is not
operable. Your venting system must not be blocked by
any snow, snow drifts, or any foreign matter. Inspect
your venting system to ensure adequate ventilation
exists at all times! Failure to follow these
recommendations could result in death or serious
injury due to Carbon Monoxide Poisoning (symptoms
include grogginess, lethargy, inappropriate tiredness, or
flu-like symptoms).
operable. Your venting system must not be blocked by
any snow, snow drifts, or any foreign matter. Inspect
your venting system to ensure adequate ventilation
exists at all times! Failure to follow these
recommendations could result in death or serious
injury due to Carbon Monoxide Poisoning (symptoms
include grogginess, lethargy, inappropriate tiredness, or
flu-like symptoms).
WARNING
Flame Roll-Out Hazard!
Flame roll-out can cause fire! The flame roll-out switch
trips in events in which flame extends beyond the
combustion chamber. When the flame roll-out switch
trips, it interrupts the flow of electric current to the
control board, interrupting the flow of gas to the unit
heater in the event of sustained flame roll-out from the
burner area. If the flame roll-out switch trips, you must
determine and correct the cause of the flame roll-out
before starting the unit back up. Failure to do so could
result in death or serious injury.
trips in events in which flame extends beyond the
combustion chamber. When the flame roll-out switch
trips, it interrupts the flow of electric current to the
control board, interrupting the flow of gas to the unit
heater in the event of sustained flame roll-out from the
burner area. If the flame roll-out switch trips, you must
determine and correct the cause of the flame roll-out
before starting the unit back up. Failure to do so could
result in death or serious injury.
WARNING
Hazard of Explosion!
Never use an open flame to detect gas leaks. Explosive
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Before attempting
to light or relight the pilot, wait 5 minutes to allow gas
which may have accumulated in the burner
compartment to escape. Failure to follow
recommended safe leak test procedures or pilot
lighting/relighting instructions could result in death or
serious injury or equipment or property-only-damage.
conditions may occur. Use a leak test solution or other
approved methods for leak testing. Before attempting
to light or relight the pilot, wait 5 minutes to allow gas
which may have accumulated in the burner
compartment to escape. Failure to follow
recommended safe leak test procedures or pilot
lighting/relighting instructions could result in death or
serious injury or equipment or property-only-damage.