High-Humidity Alarm Field Adjustment (Hrd-Em Only) - Sigma HRD Serie Manual De Instrucciones

dryer is returned to service, check the ADV for air or
condensate leaks; tighten connections as required to
correct leaks. Check the drain cycle; adjust the timer
according to the procedure in the ADV Adjustment
section.
High-Humidity Alarm Field Adjustment
(HRD-EM only)
The high-humidity alarm is a feature on the HRD-EM
Series dryers.
To set the high-humidity alarm:
1. Turn power switch OFF.
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 10).
Figure 10
HIGH-HUMIDITY ALARM CIRCUIT BOARD
POTENTIOMETERS P1 & P3
1-18
4. A calibrated set plug (refer to Figure 11) 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.
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 10) 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.
Figure 11
SET PLUG
HRD and HRD-EM Series (Bulletin 378)