Installation and Maintenance Manual

24 GBNE-SVX001A-EN
D6923B
Operation
Power Vented Blower 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.
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).
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.
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.
6. 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 Figures 11-17 for parts/identification.
Figure 11 -
Direct Spark Ignition
System, Bottom View
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.
WARNING
Never use an open flame to detect gas leaks. Explosive condi-
tions may exist which could result in personal injury or death.