Trane Gas Unit Heaters Wartungshandbuch

GUNE-SVX001A-EN

27 

1.

The duct furnace is equipped with a power vent system 
that consists of a power vent motor and blower, 
pressure switch, and sealed flue collector in place of a 
conventional gravity vent draft diverter.

2. The power vent 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.

3. The direct spark ignition system consists of an 

integrated control board, a spark ignitor, a flame 
sensor, and a gas valve. When the pre-purge period 
ends, the direct 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 gas valve closes to stop the flow of 
gas to the unit. Refer to 

4. The high limit switch interrupts the flow of electric 

current to the control board if the duct furnace 
becomes overheated, interrupting the flow of gas to 
the gas valve. The duct furnace will begin a post-purge 
period. When the post-purge period ends, the power 
vent motor is de-energized.

5. Once the thermostat is satisfied, the duct furnace will 

begin a post-purge period. When the post-purge 
period ends, the power vent motor is de-energized.

6. The wall thermostat, supplied optionally, is a 

temperature sensitive switch that operates the power 
vent and direct spark ignition system to control the 
temperature of the space being heated.The thermostat 
must be mounted on a vertical, vibration-free surface 
free of air currents and in accordance with the 
furnished instructions (also refer to 

).

1.

Open the manual gas valve in the gas supply line to the 
duct furnace. Loosen the union in the gas line to purge 
it of air. Tighten the union and check for leaks.

2. Open the supply gas valve on the duct furnace.

3. Turn ON the electrical power.

4. Turn on the system fan (provided by others).

5. The unit should be under the control of the 

thermostat.Turn the thermostat to the highest point 
and determine that the power vent motor starts and the 
burners ignite. Turn the thermostat to the lowest point 
and determine that the power vent motor shuts off and 
the burners are extinguished.

6. Turn the thermostat to the desired position.

7.

See 

.

1.

Turn the valve selector lever to the “OFF” position.

2. Turn off the electricity.

3. To relight, follow 

See 

 for parts 

identification.