Air Dryer
5 Troubleshooting
5 - 2
How to reset the thermal relay and high pressure switch
If light goes off during operation and refrigerating compressor stops, the thermal relay or high pressure switch
(for only the IDU55E and IDU75E) to protect the refrigerating compressor starts operating and needs to be
reset manually. For the position of the thermal relay and high pressure switch, refer to page 1-1.
Remove causes to start the thermal relay or high pressure switch referring to “5-1 Cause and countermeasure
for errors”.
Danger
Be sure to turn off the switch with light of the body.
How to reset a thermal relay
①
Turn off the switch with lamp of the body.
②
Take off the front panel. The thermal relay as shown on
right figure can be found on the power supply terminal base.
＋
＋
＋
＋
③
Confirm that a green indication does not appear at an
indication window of thermal relay.
If the green indication appears, there are other possible causes
and contact SMC with remaining the power supply on.
④
Press the blue reset button and confirm that the green
indication comes to appear at the indication window.
⑤
Put back the front panel.
⑥
When the switch with lamp is turned on, the product will restart
Indication
window
Reset
button (Blue)
【
IDU22E
〜
55E
】
Reset
button (Blue)
【
IDU75E
】
operation.
How to reset a high pressure switch
①
Turn off the switch with lamp of the body.
②
Take off the front panel. The high pressure switch can
be found at upper right part of power supply terminal
base.
③
Press the red rest button.
④
Put back the front panel.
⑤
When the switch with lamp is turned on, the product will
Thermal relay
High pressure switch
Rest button
(Red)
High pressure
switch bracket
restart operation.
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