Service
&
Troubleshooting
3.17.5 Low Air Pressure Alarm Calibration
The air pressure sensor is located near the compressed air receiver. See drawing 802-101780-01.
A switch located near the controller (remove lower panel below Control Console) allows the low pressure
alarm sensor to be bypassed to allow troubleshooting. Assure that the Low Pressure Alarm switch is
ENABLED for normal operation.
To calibrate the switch:
1)
Verify that the Low Pressure Alarm switch is enabled.
2)
Close all flowmeter valves.
3)
Set inlet air pressure to desired set point pressure. Read pressure on gage in Figure 3.17.1 Enable Low
Pressure
4)
Rotate the Adjusting Wheel: Clockwise to increase the pressure set point, counterclockwise to decrease.
You can hear a faint click when the micro switch changes state. Below this point below which the
switch will activate the alarm when enabled.
5)
Start the furnace system without power to the lamps. Close the facility air valve to the furnace. Open
the flowmeter valves and verify that the alarm trips when the pressure drops below the new set point.
6)
Readjust as necessary and retest.
Figure 3.17.1 Enable Low Pressure Alarm switch
Figure 3.17.2 Air Pressure sensor
Adjusting Wheel
10-004 – 676-110000
3-25
Содержание LA-309
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