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 750 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 750 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 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 AD 750 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 750 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 Dehumidifier 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 750 Dehumidifier 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.
Check for shipping damage and report to carrier immediately.
Basic safety rules and precautions for using air compressors and accessories.
Warranty void if used for breathing air without proper precautions.
Install indoors with proper ventilation and ambient temperature limits.
Ensure adequate clearance for cooling air circulation and servicing.
Connect air lines, recommend bypass, afterfilter, and proper pipe support.
Install aftercooler, separator, and drain to remove moisture before dryer.
Connect drain lines properly and comply with disposal regulations. Includes safety warning.
Connect water lines, ensure proper pressure, and use strainers and chemical treatment.
Connect power according to diagram, use fused disconnect switch. Includes safety warnings.
Specifies ideal inlet air temperature, pressure, and ambient conditions for optimal operation.
Step-by-step guide for safely starting the air dryer, including checks and valve operations.
Details recommended pressure ranges and settings for R-134a and R-404a refrigerants.
How to cycle and view different temperature readings on the DDG controller display.
Instructions for setting ON/OFF times and understanding drain modes for automatic drains.
Explains what the alarm light signifies and common causes for it.
How to access and test the 'Service Due' status and reset the maintenance timer.
Step-by-step guide to safely shut down and isolate the dryer for maintenance.
Specifies acceptable entering air temperature ranges and consulting for higher temperatures.
Details the design and maximum operating air pressure limits for optimal capacity.
Outlines the allowed ambient temperature range and its effect on performance.
Routine checks for fan motor, condenser, water-cooled condensers, pressure gauges, and pressure drop.
Recommended settings and periodic checks for automatic drain valve operation.
Step-by-step guide to disassemble, clean, and reassemble the drain valve.
Instructions for cleaning the particle strainer screen to ensure proper airflow.
Lists common symptoms, their causes, and recommended remedies for dryer malfunctions.
Continues the guide with additional symptoms, causes, and remedies for dryer issues.
Further troubleshooting steps for various operational problems and conditions.
General| Brand | Pneumatech |
|---|---|
| Model | AD 750 |
| Category | Dehumidifier |
| Language | English |
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