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Prior to carrying out maintenance works at the dryer, switch it off and wait for at least 30 minutes.
Caution!
Hot surfaces!
During operation, several components can reach surface temperatures of more than 140°F (60°C).
There is the risk of burns.
All components concerned are installed inside of the closed housing. The housing must only be opened
by certified skilled personnel.
Some components can reach high temperatures during operation. Avoid any contact until the system or
the component has cooled down.
FAULT
The dryer does not
start.
The refrigerating
compressor does not
work.
The fan of the
condenser does not
work (air-cooled).
Dew point too high.
Dew point too low.
DRYPOINT® RAX 200-500 NA 3PH UL
POSSIBLE REASON – SUGGESTED MEASURE
Check whether or not the dryer is connected with the electric mains.
Check the electric cabling.
Blow of fuse (FU3 on the electric diagram) of the auxiliary circuit - replace it and check the
proper operation of the dryer.
The internal heat protection of the compressor was activated – wait 30 minutes and then
retry.
Check the electric cabling.
If installed – replace the internal heat protection and/or the start-up relay and/or the starting
capacitor and/or the operating capacitor.
If installed – the HPS pressure switch was activated – see the corresponding point.
If installed – the LPS pressure switch was activated – see the corresponding point.
If installed – the TS safety temperature switch was activated – see the corresponding point.
In the event that the compressor still does not work, replace it.
Check the electric cabling.
The PV pressure switch is defective. Contact a service technician.
Blow of fuse (FU1-FU2 on the electric diagram) - replace it and check the proper operation
of the dryer.
There is a leak in the refrigeration cycle – contact a service technician.
In the event that the fan still does not work, replace it.
The dryer does not start up – see the corresponding point.
The T1 dew point sensor does not record the temperature properly – ensure that the sensor
is pushed down to the bottom of the aluminium tube immersion sleeve.
The refrigerating compressor does not work – see the corresponding point.
The ambient temperature is too high or the room ventilation insufficient – ensure sufficient
ventilation (air-cooled).
The inlet air is too hot – re-establish the nominal conditions.
The inlet air pressure is too low – re-establish the nominal conditions.
The inlet air throughput is higher than the throughput of the dryer – reduce the flow rate - re-
establish the nominal conditions.
The condenser is dirty – please clean it (air-cooled).
The condenser fan does not work – see the corresponding point (air-cooled).
The cooling-water flow is insufficient – re-establish the nominal conditions (water-cooled).
The dryer does not discharge the condensate – see the corresponding point.
The hot-gas bypass valve needs to be re-adjusted – contact a service technician to have
the nominal setting re-established.
There is a leak in the refrigeration cycle – contact a service technician.
The fan runs continuously – the PV pressure switch is defective – replace it (air-cooled).
The ambient temperature is too low –re-establish the nominal conditions.
The hot-gas bypass valve needs to be re-adjusted – contact a service technician to have
the nominal setting re-established.
Maintenance, troubleshooting, spare parts and dismantling
31
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Table of Contents
Troubleshooting
