Calibrating The Dew Point Monitor Probe - Ingersoll Rand HRD Serie Manuel De Instrucciones

DANGER
SHOCK HAZARD
Portions of the electrical control circuit remain
energized when the power switch is turned
OFF. Disconnect the main power supply to the
dryer before performing maintenance on the
electrical system.
2. Open the door of the electrical control box.
3. Locate the high-humidity alarm circuit board (ref-
er to Figure 8).
4. A calibrated set plug (refer to Figure 9) is shipped
loose inside the electrical box. The set plug is
used to select the setting at which the high-
humidity alarm sounds.
5. Remove the conduit connector (¾-inch) from the
outlet piping.
6. Unplug the white receptacle and insert the set
plug into the ribbon cable socket.
7. Unplug CON 8 from bottom right hand corner of
the control board.
8. Unplug CON 10 from right side of the control
board.
Figure 8
HIGH-HUMIDITY ALARM CIRCUIT BOARD
POTENTIOMETERS P1 & P3
1-16
9. Connect a continuity tester to cable R (CON 10
PIN 1) and cable S (CON 8 PIN 2). The continu-
ity tester is now connected across normally open
alarm contacts.
10. Turn the power switch to ON.
11. Set the alarm silencer switch to OFF. This switch
is on the door of the control box.
12. With a small slotted screwdriver, adjust P1 on the
high-humidity circuit board (Figure 8) clockwise
and counterclockwise. Find the adjustment point
where the contacts open and close. Leave adjust-
ment where the contacts just close.
NOTE: DO NOT ADJUST POTENTIOME-
TER P3.
13. Put a drop of lacquer on potentiometer P1 to pre-
vent vibrations from altering the setting.
14. Turn the power switch to OFF.
15. Remove the set plug and reinsert the white
receptacle.
16. Reinsert the conduit connector in outlet piping.
The high-humidity alarm is now set.
To put the dryer back into service, follow the start-up
instructions on page 1-7.

Calibrating the Dew Point Monitor Probe

To program the dry end capacitance number of a sen-
sor use the following procedure:
1. Power up the unit.
2. Move DIP switch #1 (top switch) to the OFF posi-
tion (to the left) and press the SELECT FUNC-
Figure 9
SET PLUG
HRD Series (Bulletin 348)