To Next PageTo Next PageHow to troubleshoot SPX RDH-HP when indicator lights are not illuminated?
If the indicator lights on your SPX Dehumidifier are not illuminated, there could be several reasons: * There is no power to the unit. Check the voltage at the terminal board. * The On/Off switch is off. Turn the switch on. * The switch is malfunctioning. Replace the switch.
Why does the tower in my SPX Dehumidifier fail to depressurize to less than 2 psig?
If the tower in your SPX Dehumidifier fails to depressurize to less than 2 psig, the following could be the reasons: * The purge rate valve is open too far: Check Section 3.1.4 for the purge rate indicator setting. * The muffler is clogged: Replace the muffler. * The check valve is stuck open: Repair the valve. * The purge repressurization valve won’t open: Check the power to the valve to determine if the valve or timer is at fault. Also, check the pilot valve, pilot air line, and purge repressurization valve for obstruction.
What to do if the moisture indicator on my SPX RDH-HP Dehumidifier turns yellow?
If the moisture indicator on your SPX Dehumidifier turns yellow (elevated outlet dew points), consider the following: * Maximum flow being exceeded: Refer to Table 3A to determine the maximum flow. * Design conditions being exceeded: Refer to Section 3.5 to determine if the dryer is being operated within its design limitations. * Desiccant not adsorbing: Change the desiccant. * Useful service life has ended: Take corrective action. * Desiccant is contaminated (e.g. with oil): Refer to Section 2.1 to determine proper prefiltration, then change the desiccant. * Premature exhaustion (saturated with water): Refer to 5.3 for corrective action. Also, desiccant beds may be reactivated by running at reduced flow until the desired outlet dew point is achieved.
What causes the tower in my SPX RDH-HP to fail to pressurize to line pressure?
If the tower in your SPX Dehumidifier fails to pressurize to line pressure, it could be due to: * Purge repressurization valve won’t close: Check the valve for obstruction. * Excessive downstream air demand: This valve is normally closed. Also, check the pilot solenoid valve and pilot air line for obstruction.
Why is excessive purge air discharged during the purge cycle of my SPX Dehumidifier?
If excessive purge air is being discharged during the purge cycle of your SPX Dehumidifier, consider the following: * The inlet valve won’t close: Check the power to the valve to determine if the valve or timer is at fault. * The check valve is sticking: Check the valve for obstruction. Also, check the pilot valve and pilot air line for obstruction and repair the valve if needed.
What causes switching failure in my SPX RDH-HP?
Switching failure in your SPX Dehumidifier can occur due to: * Unit did not depressurize in time (24 sec) or below 10#: Replace mufflers or defective parts. * Unit did not repressurize in time (24 sec) or not above 40#: Provide proper air pressure. Also, replace defective parts and set purge pressure per section 3.1.4.
How to prevent excessive desiccant dust downstream in SPX RDH-HP Dehumidifier?
To prevent excessive desiccant dust downstream in your SPX Dehumidifier: * Refer to Section 3.2.3 to verify the proper time sequence if you have a faulty timer. * Refer to Section 3.1.4 to determine the Correct Purge Pressure setting if the purge rate valve is closed.
General| Brand | SPX |
|---|---|
| Model | RDH-HP Series |
| Category | Dehumidifier |
| Language | English |
Guidance on inspecting the shipment for damage upon arrival.
Safety advice regarding proper lifting and handling of the equipment.
Covers basic installation steps for the dryer.
Provides essential steps for initiating dryer operation.
Key checks to perform during normal dryer operation.
Procedure for safely shutting down and depressurizing the dryer.
Explains the operational purpose and mechanism of the dryer.
Describes the specific characteristics of the dual tower regenerative desiccant dryer.
Explains the flow and regeneration process of the dual tower dryer.
Guidelines for placing the dryer within the compressed air system.
Specifies minimum and maximum operating pressures and temperatures.
Instructions for securely mounting the dryer unit.
Details on connecting inlet, outlet, and isolation valves.
Details on how to connect the power supply to the dryer unit.
Information on connecting remote alarm contacts for status monitoring.
Guidance on installing factory-supplied mufflers for exhaust.
Steps for initiating dryer operation after installation.
Details on setting up the control board, including voltage and dip switches.
Checking unit power, moisture indicator, and purge flow.
Monitoring unit alarms and the switching failure condition.
Verifying tower status lights and pressure gauge readings.
Addresses symptoms where indicator lights are not illuminated.
Troubleshooting elevated outlet dew points indicated by a yellow light.
Diagnosing premature desiccant exhaustion and related causes.
Resolving issues with tower pressurization and excessive purge air.
Addressing unit failure to depressurize or repressurize within time limits.
List of replacement parts for switches, indicators, and gauges.
Part numbers for prefilters, afterfilters, and oil removal elements.
Available desiccant quantities and part numbers for replacement.
