Why is the liquid line frosted on my Pneumatech Dehumidifier?
A frosted liquid line on your Pneumatech Dehumidifier can indicate: * A high-side service valve that is partially closed or restricted. Open the valve or remove the restriction. * A restricted filter/dryer. Replace the filter/dryer.
Why does my Pneumatech AD run, but the air pressure is low?
If your Pneumatech Dehumidifier runs but the air pressure is low, here are some potential causes: * The system pressure might be low. Increase the pressure. * The precooler or evaporator might be clogged. Back-flush using a mild detergent. * Incorrect piping can restrict airflow. Increase the line size or correct the piping as needed. * An air overload can reduce pressure. Reduce the overload. * The unit might be too small for the application. Add another unit or replace it with a larger one. * Excess water in the unit can cause low pressure. Check the drain and repair or replace it if needed. * Evaporator freeze-up can also lead to this issue. Adjust the hot gas bypass valve. * A clogged air compressor intake filter can restrict airflow. Clean or replace the air intake fi...
Why does my Pneumatech AD Dehumidifier compressor short cycle on overload?
If your Pneumatech Dehumidifier's compressor starts and runs but short cycles on overload, consider these potential causes: * Low voltage or phase unbalance can cause this. Check that the voltage is within ±10% of the voltage listed on the nameplate. * Additional current going through the overload can be the issue. Check the wiring diagram and look for added electrical devices connected through the protector. * The overload protectors themselves might be defective. Check the current and replace them if necessary. * A weak run capacitor can also lead to short cycling. Check the capacitance and replace the capacitor if needed. * A short in the winding can cause this problem. Check the resistance and replace the compressor if necessary. * The current relay might be sticking. Chec...
Why is the air temperature high when my Pneumatech AD Dehumidifier is running?
If your Pneumatech Dehumidifier is running but the air temperature is high, several factors could be responsible: * A refrigerant leak could be the cause. Locate the leak and repair or replace the defective part. * The filter/dryer might be clogged, restricting airflow. Replace it. * There might be a refrigerant shortage. Repair any leaks and recharge the system. * A dirty condenser can reduce efficiency. Clean the condenser. * Air in the system can also lead to this issue. Check for the reason, repair, vacuum, and recharge. * An inefficient compressor could be the problem. Repair or replace it. * Defective insulation can also cause high air temperature. Repair the insulation. * An air overload might be present. Reduce the load. * The unit might be too small for the spac...
Why does the condenser fan blow outward on my Pneumatech Dehumidifier?
If the condenser fan on your Pneumatech Dehumidifier blows outward, it could be due to: * Improper wiring at the disconnect (3 phase only). Reverse two wires.
Why are the top condenser coils cool when my Pneumatech Dehumidifier is running?
If the top condenser coils are cool when your Pneumatech Dehumidifier is in operation, it might be due to: * A refrigerant shortage. Repair the leak and recharge the system. * An inefficient compressor. Repair or replace the compressor.
What causes evaporator freeze-up in a Pneumatech AD Dehumidifier?
Evaporator freeze-up in your Pneumatech Dehumidifier can be caused by: * A hot gas bypass valve that is out of adjustment. Adjust the suction pressure and the hot gas bypass valve.
What does a frosted suction line on a Pneumatech Dehumidifier mean?
If you notice a frosted suction line on your Pneumatech Dehumidifier, it may be caused by: * Expansion valve and/or hot gas bypass out of adjustment. Adjust the hot gas bypass valve to bring the suction pressure into the proper range.
Why is the airflow erratic or zero when my Pneumatech AD is running?
If your Pneumatech Dehumidifier runs, but the airflow is erratic or zero, consider the following: * Freeze-up could be the issue. Check the suction temperature at the evaporator outlet, or turn off the unit and allow it to thaw to determine if this is the problem. Adjust controls at no-load if freezing is occurring. * The precooler or evaporator might be clogged. * There could be a restriction in the piping upstream from the unit. Correct as required.
How to troubleshoot a Pneumatech AD that does not run?
If your Pneumatech Dehumidifier isn't running, several issues could be the cause. Here's what to check: * Ensure the disconnect switch is closed to start. * Replace any blown fuses. * If the overload has tripped, turn the switch off, wait 15 minutes, and then check for any overload conditions. * Inspect safety controls; repair or replace if necessary. * For a dead-end control system, check the air pressure and adjust the air or switch, repairing or replacing if defective. * If the compressor is frozen or locked, it may need repair or replacement. * Examine the wiring against the diagram to ensure it's properly connected and not loose.
Follow basic safety rules and precautions when using air compressors and accessories.
Install aftercooler, separator, and drain before dryer to remove moisture.
Connect electric power per diagram; dryer must be wired separately from compressor cycling switch.
Ensure correct phase sequence for unidirectional scroll compressors to prevent damage.
Step-by-step guide for starting the dryer, including pre-start checks and valve operations.
Lists pressure and temperature settings for R-134a and R-404a refrigerants.
Lists conditions that trigger the alarm indicator and troubleshooting steps.
Routine maintenance procedures for the air dryer, including fan, condenser, and pressure checks.
General| Operating Pressure | Up to 16 bar |
|---|---|
| Airflow | Varies by model |
| Moisture Removal Capacity | Varies by model |
| Power Supply | 50/60 Hz |
| Dimensions | Varies by model |
| Weight | Varies by model |
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