Van Air Systems High Dew Point Alarm Box - Manual (Page 4)

PAGE 4
MAINTENANCE SECTION 5
5.4 HUMISTAT CALIBRATION PROCEDURES
After the sampling line and power lines are connected, the humistat
must be adjusted as follows:
Unplug the cable from the dew point sensor.
Plug the set plug into the cable.
Apply power to the controller and adjust the potentiometer,
(REFERENCE FIGURE 5A), on the PC board. Rotate the
potentiometer back and forth, noting the position of the screw-
driver slot when the relay clicks as it pulls in and drops out. Set
the potentiometer midway between these two points.
Remove the set plug.
Plug the cable back to the dew point sensor.
The humistat is now ready for operation.
FIGURE 5A HUMISTAT DETAIL
REPLACEMENT PARTS SECTION 6
ITEM NO DESCRIPTION PART NO QTY
1 ISOLATION VALVE 14-1306 1
2 BLEED ORIFICE 26-0490 1
3 DEW POINT SENSOR 26-0817 1
4 SENSOR MOUNT 26-0816 1
5 CABLE 46-2185 1
6 HUMISTAT 26-0814 1
7 SET PLUG 26-0818 1
8 REPLACEMENT LIGHT BULB 26-0726 1
9 LIGHT ASSEMBLY (W/RED LENS) 26-2141 1
10 RESET PUSHBUTTON 26-3757 1
11 ORIFICE COUPLING 26-0657 1
12 ORIFICE BUSHING 26-0296 1
13 CONTROL RELAY 26-0813 1
14 MUFFLER 26-0623 1
2950 Mechanic Street
Lake City, PA 16423 USA
Phone: 800/840-9906
Corporate Fax: 814/774-0778
Order Entry Fax: 814/774-3482
www.vanairsystems.com
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