Harbor Freight Tools 40211 - Manual (Page 7)

For technical questions, please call 1-800-444-3353. Page 7 SKU 40211
Operation (continued)
Note: The Air Dryer works using “Refrigerant 134A”. The refrigerant system does not need to
be serviced unless the unit begins to leak. If the unit leaks refrigerant, take it to an
authorized service technician.
Note: Decide whether you want to use the Air Dryer or bypass the unit. Follow the instruc-
tions for using or not using the bypass valve on page 5. If you set the valves for “Using
the Air Dryer”, follow the instructions below.
1. Turn on the unit with the Switch on the control panel. See FIGURE 4 on page 6.
2. If, after the unit has warmed up, you don’t hear the fan running, there is likely not
enough pressure to turn on the pressure switch. Turn off the unit and the compressor.
Close the Air Inlet (#6). Then, turn the Air Dryer back on and it will build up pressure
in a few minutes. Open the Air Inlet (#6). Turn on your compressor and let air in slowly
at first. During operation, dry air will pass through the unit to the tool or application.
3. When you are finished, stop the air compressor first. Continue to run the Air Dryer until
all of the compressed air runs through the system.
4. Turn off the Air Dryer.
Note: If the Air Dryer stops and the Problem Light (See FIGURE 4 on page 6) goes on, the
unit is running at too high of a temperature or pressure. Let the unit cool. Unplug the
Air Dryer. Open the side panel (See FIGURE 3 on page 6) and push the reset button
on the Pressure Switch (#14). See the Assembly drawing on page 10. Plug in the unit
and restart. If the Problem Light stays on, or comes on continually, take the unit to an
authorized service technician.
Troubleshooting
Warning!! Repairing this unit (other than trying to reset the Pressure Switch (#14), as men-
tioned above) should only be performed by an authorized service technician.
Problem 1: Unit shuts off by itself.
Reason: Temperature or pressure is too high or fan is overheated. Or, the Condenser (#11) is dirty.
Solution: Reset pressure switch as described in the note above, or clean the Condenser (#11) as
described in Maintenance on page 8.
Problem 2: No power light when the unit is on.
Reason: Loose connections at wiring panel.
Solution: Check the connections and tighten.
Problem 3: Unit won’t cool/dry air.
Reason: Water in the refrigeration unit because of: Auto drain blocked, bad valve, bad connection to
capacitor, bad capacitor, bad fan unit, low air pressure.
Solution: Clean auto drain and tube, replace valve, check capacitor connection, replace capacitor,
replace fan unit, turn up air pressure on compressor.
Problem 4: Unit buzzes and won’t operate.
Reason: Bad capacitor.
Solution: Replace capacitor.
Only done by a qualified electrician or service technician.
Problem 5: Fan isn’t working at the correct temperature and pressure.
Reason: Bad fan bearing, bad fan capacitor, or bad temperature switch.
Solution: Replace fan bearing, fan capacitor, or temperature switch.
Only done by a qualified electrician or service technician.
Problem 6: Pressure on the inlet or outlet valves increase for no reason.
Reason: Bad internal pressure valve.
Solution: Replace internal pressure valve.
REV 02/05