User Guide
Troubleshoot
15
If you encounter a problem that you cannot readily solve, call EFD.
Trouble Possible cause and correction
No power 1. Be sure that there is power available at the wall receptacle.
2. Unplug the unit. Make sure AC/DC power supply’s main plug adapter is
firmly seated and locked on the supply body.
3. Make sure that the power lead is firmly inserted and seated at the rear
of the unit.
4. If the unit still does not have power, please call EFD for assistance.
Unit will not maintain 1. Make sure the thermocouple is solidly plugged into rear of the unit and
pre-set temperature lead is affixed to process hardware.
2. Check incoming air pressure and flow. For maximum efficiency, the unit
must be supplied with 100 psi (6.9 bar) of clean, dry air.
3. If the pressure is fluctuating or dropping, the unit efficiency will be reduced.
Insufficient airflow will cause degradation to the minimum and maximum
temperatures the unit can provide.
4. Check air pressure to ensure that it is not varying. If needed, use the filter
regulator (EFD part #2000F755).
5. Slow drop or rise from the desired temperature (usually over the course of
several hours) can be moisture inside the air supply causing freezing
inside the unit. This will reduce the airflow, and degrade the minimum and
maximum temperatures the unit can provide.
To properly diagnose if this is occurring, shut off the unit for several minutes
to allow the potential blockage to thaw. Turn the unit back on. If the
temperature resumes the required set point, it is a sure sign that moisture
is present.
If your process is not dependent on the unit running continuously, shut
down the unit in between runs to prevent moisture buildup in the unit.
The preferred method is to install line dryers: refrigerant type, inline
desiccant, or membrane dryers. The desiccant and membrane type
dryers have been shown to produce substantial dew point reductions,
and are the preferred method to reduce moisture in the unit. These are
available from EFD.
Condensation forms 1. Condensation may form on the process supply tubing if temperature set
on the tubing points are well below ambient room temperature and relative humidity is
high.
2. Tube insulation supplied with the unit will prevent condensation from
forming and will also increase overall efficiency.