Unitor UPC 1041, Instruction Manual

Page: 25 / 46

Revision date: 120813 Page 25 of 46
Check the K1 pressure switch and K2-4 thermostat.
Connect air at 6-8 bar to the regulator turn, turn the knob on the regulator to increase pressure
setting while you measure between cable 46 and 66 on the K1 pressure switch with resistance
or summer measurement, at approx. 3.5 bar the K1 pressure switch should switch on.
Correct value is 0 ohm.
If the pressure switch doesn’t switch on replace the pressure switch.
Measure between pin 1-2 on the A3 and A4 connector on the E4 secondary PCB with
resistance or summer measurement.
Correct value is 0 ohm.
If value is high or no connection is measured then replace thermostat K2-4.