in the compressor motor, the resulting high temperature arc causes a portion of the refrigerant oil mixture to break down into carbonaceous sludge, a very corrosive acid, and water. These contaminants must be carefully removed otherwise even small residues will attack replacement compressor motors and cause failures.

The following procedure is effective only if the system is monitored after replacing the compressor to insure that the clean up was complete.

1.This procedure assumes that the previously listed compressor motor circuit tests revealed a shorted or open winding.

2.Remove and properly dispose of the system charge. DO NOT vent the refrigerant or allow it to contact your eyes or skin.

3.Remove the burned out compressor. Use rubber gloves if there is any possibility of contacting the oil or sludge.

4.To facilitate subsequent steps, determine the type of burn out that occurred. If the discharge line shows no evidence of sludge and the suction line is also clean or perhaps has some light carbon deposits, the burn out occurred while the compressor was not rotating (standing burn out). Contaminants are therefore largely confined to the compressor housing. A single installation of liquid and suction line filter/driers will probably clean up the system.

If sludge is evident in the discharge line, it will likely be found in the suction line. This indicates the compressor burned out while running (running burn out). Sludge and acid have been pumped throughout the system. Several changes of the liquid and suction filter/driers will probably be necessary to cleanse the system.

5.Correct the system fault that caused the burn out. Consult the factory for advice.

6.Install the replacement compressor with a new capacitor and an oversized liquid line filter.

In a running burn out, install an oversized suction line filter/drier between the accumulator and compressor. Thoroughly flush the accumulator with refrigerant to remove all trapped sludge and to prevent the oil hole from becoming plugged. A standing burn out does not require a suction line filter/drier.

7.Evacuate the system with a good vacuum pump and accurate vacuum gauge. Leave the pump on the system for at least an hour.

8.Operate the system for a short period of time, monitoring the suction pressure to determine that the suction filter is not becoming plugged. Replace the suction filter/drier if pressure drop occurs. If a severe running burn out has occurred, several filter/driers may have to be replaced to remove all of the acid and moisture.

NOTE: NEVER use the compressor to evacuate the system or any part of it.

5.6C Replacing a Compressor, Nonburn Out

Remove the refrigerant from the system. Replace the compressor and liquid line filter/drier. Charge the system to 50 PSIG and check for leaks. Remove the charge and weigh in the refrigerant quantity listed on the nameplate. Operate the system to verify performance.

5.7 Remote Controls

Devices mounted on a panel that is remote from the unit control the DHV-150H. You may or may not have the devices listed below depending on the model of the remote control panel that you purchased. If the DHV-150H fails to operate as desired, always check the settings of the controls to insure that they are correct. Check that the controls are receiving 24Vac from the DHV-150H. Check the connections between the DHV-150H, the control panel, and the field control wiring.

5.7A Humidity Control

The humidity control is an adjustable switch that closes when the relative humidity of the air in which it is located rises to the dial set point. It opens when the RH drops 4 to 6% below the set point. If the DHV- 150H does not run, try turning the humidity control clockwise until it reaches the stop and the knob pointer points at “Max Dry” (see back of control panel cover.)

The DHV-150H is equipped with an automatic defrost mechanism. If the DHV-150H operates in conditions that develop frost on the evaporator, it will sense the frost build-up and automatically defrost the evaporator. The DHV-150H may not appear to be operating correctly during the defrost sequence, but once the defrost sequence is completed, the DHV-150H will resume dehumidifying.

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American Aldes DHV-150H specifications Remote Controls, 6C Replacing a Compressor, Nonburn Out, 7A Humidity Control
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DHV-150H specifications

The American Aldes DHV-150H is an advanced ventilation unit designed to optimize indoor air quality in residential and commercial spaces. Known for its efficiency and reliability, the DHV-150H incorporates cutting-edge technologies to ensure that both air exchange and energy conservation are maximized.

One of the standout features of the DHV-150H is its high airflow capacity. It can effectively manage ventilation requirements for spaces up to 1,500 square feet, making it an ideal solution for medium to large residences and commercial buildings. The unit boasts a robust airflow rate of 150 CFM (cubic feet per minute), enabling swift air exchange and preventing the accumulation of indoor pollutants.

Energy efficiency is a hallmark of the DHV-150H, which is equipped with an advanced heat recovery ventilator (HRV) system. This technology allows the unit to recover and transfer heat from the outgoing stale air to the incoming fresh air. As a result, the DHV-150H can significantly reduce heating costs in winter, while still maintaining a comfortable indoor environment.

In terms of construction, the DHV-150H features a durable housing made from high-quality materials that ensure longevity and resistance to corrosion. Its compact design allows for flexible installation options, whether mounted on a wall or in a ceiling, seamlessly integrating into any architectural space.

The DHV-150H also prioritizes user experience and control. With a user-friendly interface, it allows homeowners and facility managers to easily adjust settings and monitor performance in real-time. This adaptability is further enhanced by compatibility with smart home systems, enabling remote control via smartphone applications or smart home networks.

Noise reduction is another key characteristic of the DHV-150H. The unit operates at a low sound level, ensuring that it does not disrupt the tranquility of living or working environments. This is particularly important for settings such as bedrooms, offices, and healthcare facilities where a peaceful atmosphere is essential.

In summary, the American Aldes DHV-150H represents a perfect blend of efficiency, technology, and user-centric design. Its high airflow capacity, energy recovery capabilities, robust construction, and smart integration make it a top choice for those seeking reliable and effective ventilation solutions. Whether for enhancing home comfort or improving commercial air quality, the DHV-150H continues to set standards in the HVAC industry.
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