ICP iDRY iRDP CT 30, Instructions For Installation And Operation Manual

Page: 35 / 72

Maintenance, troubleshooting, spare parts and dismantling
iDRY iRDP CT 20-500 35

The internal heat
protection of the
compressor has been
activated

Check which of the following reasons has caused the activation:
1. Excessive thermal load – restore the standard operating conditions.
2. The inlet air is too hot – restore the nominal conditions.
3. The ambient temperature is too high or the room aeration is insufficient – provide proper
ventilation.
4. The condenser unit is dirty – clean it.
5. The fan does not work – see specific point.
6. If ESS=NO (see section 8.12.7) – The hot gas bypass valve is out of setting – contact a ICP
service technician to restore nominal setting.
7. The solenoid valve EVL is not operating correctly - see specific point.
8. There is a leak in the refrigerant circuit – please contact a ICP service technician.

wait 30 minutes and then retry.

The solenoid valve
EVL or EVH doesn’t
operate correctly

The solenoid valve is not activated and there is no voltage to the coil – verify the
electric wiring.

The solenoid valve is not activated and there is no voltage to the coil – the internal
relay of DMC51 is faulty – replace DMC51.

The solenoid valve is not activated and there is voltage to the coil – the coil is faulty –
replace it.

The solenoid valve is not activated and there is voltage to the coil – the solenoid
valve is jammed - contact a ICP service technician for the replacement.

The solenoid valve is always activated and there is always voltage to the coil – verify
the electric wiring

The solenoid valve is always activated and there is always voltage to the coil – the
internal relay of DMC51 is faulty – replace DMC51.

The solenoid valve is always activated and there is no voltage to the coil – the
solenoid valve is jammed - contact a ICP service technician for the replacement.

If installed: the HPS
high-pressure switch
has been activated.

Check which of the following reasons has caused the activation:
1. The ambient temperature is too high or the room aeration is insufficient – provide proper
ventilation.
2. The condenser is dirty – clean it.
3. The fan does not work – see specific point.
4. The solenoid valve EVL is not operating correctly - see specific point

Reset the pressure switch by pressing the button on the switch itself – check the proper
operation of the dryer.

The HPS pressure switch is faulty – contact a ICP service technician for the replacement.

If installed:
the LPS low-pressure
switch has been
activated.

There is a leak in the refrigerant circuit – please contact a ICP service technician.

The solenoid valve EVL is not operating correctly - see specific point

The solenoid valve EVH is not operating correctly - see specific point

The hot-gas bypass valve is faulty – contact a ICP service technician for the replacement

The pressure switch reset automatically when normal conditions are restored – check the
proper operation of the dryer.

If T2 installed:
the alarm (Hdt)
compressor outlet
temperature too high –
has been triggered.

Check which of the following reasons has caused the alarm:
1. Excessive thermal load – restore the standard operating conditions.
2. The inlet air is too hot – restore the nominal conditions.
3. The ambient temperature is too high or the room aeration is insufficient – provide proper
ventilation.
4. The condenser unit is dirty – clean it.
5. The fan does not work – see specific point.
6. The fan is always ON – verify the electric wiring, verify the setting of PV pressure switch or
the PV pressure switch is faulty – contact a ICP service technician to replace it
7. The T2 sensor is faulty – replace it
8. If ESS=NO (see section 8.12.7) – The hot gas bypass valve is out of setting – contact a ICP
service technician to restore nominal setting.
9. The solenoid valve EVL is not operating correctly - see specific point
10. There is a leak in the refrigerant circuit – please contact a ICP service technician.