maintain nearly constant pressure and temperature across the entire coil, from inlet to outlet.

The mixture of gas and liquid refrigerant enter the accumulator after leaving the evaporator coil. The accumulator prevents any liquid refrigerant from reaching the compressor. The compressor evacuates the cool refrigerant gas from the accumulator and compresses it to a high pressure and temperature to repeat the process.

5.3 Troubleshooting

No dehumidification, neither fan nor compressor run with fan switch and ventilation timer OFF.

1.Unit unplugged or no power to outlet.

2.Humidity control set too high or defective (Sec. 3.3 & 5.7A)

3.Loose connection in internal or control wiring.

4.Defective Compressor relay.

5.Defective control transformer.

6.Low pressure Control open (Sec 3.7 & 5.10).

7.Optional Condensate Pump Safety Switch open (Sec 5.11).

No dehumidification, compressor does not run but fan runs with fan switch and ventilation timer OFF and humidity control turned to ON.

1.Defective compressor run capacitor (Sec. 5.6).

2.Bad connection in compressor circuit (See Fig. 4).

3.Defective compressor overload (Sec. 5.6A).

4.Defective compressor (Sec. 5.6).

5.Defrost thermostat open (Sec. 5.8).

Fan runs with fan switch and ventilation timer OFF, but compressor cycles on & off.

1.Low ambient temperature and/or humidity causing unit to cycle through defrost mode.

2.Defective compressor overload (Sec. 5.6A).

3.Defective compressor (Sec. 5.6).

4.Defrost thermostat defective (Sec. 5.8).

5.Dirty air filter(s) or airflow restricted.

6.Low refrigerant charge, causing defrost control to cycle.

7.Bad connection in compressor circuit.

Fan does not run with fan switch in either position. Fan does not run with ventilation timer activated. Compressor runs briefly but cycles on & off with humidity control turned to ON.

1.Loose connection in fan circuit (See Fig. 4).

2.Obstruction prevents fan impeller rotation.

3.Defective fan.

4.Defective fan relay.

5.Defective fan capacitor.

Fan runs with fan switch ON. Fan does not run with ventilation timer activated.

1.Ventilation timer set to manual & switched OFF.

2.Time not correct on ventilation timer.

3.Defective ventilation timer.

4.Defective fan switch.

Evaporator coil frosted continuously, low dehumidifying capacity.

1.Dirty air filter(s) or airflow restricted.

2.Excessively restrictive ducting connected to unit.

3.Defrost thermostat loose or defective (Sec. 5.8).

4.Low refrigerant charge

Unit not providing ventilation. Ventilation timer not operating correctly.

1.If timer is not functioning correctly reset timer and reprogram (Sec. 3.5).

2.Check control wire connections (check connections at fresh air damper also).

3.Defective fresh air damper (Sec. 5.9).

4.Defective fan switch.

Unit removes some water, but not as much as expected.

1.Air temperature and/or humidity have dropped.

2.Humidity meter and or thermometer used are out of calibration.

3.Unit has entered defrost cycle (Sec. 5.8).

4.Air filter dirty (Sec. 4.1 & 4.2).

5.Defective defrost thermostat (Sec 5.8).

6.Low refrigerant charge (Sec. 5.4).

7.Air leak such as loose cover or ducting leaks.

8.Defective compressor (Sec. 5.6).

9.Restrictive ducting (Sec. 2.4).

10.Optional Condensate Pump Safety Switch open (Sec 5.11).

Unit Test to determine problem:

1.Detach field control wiring connections from main unit.

2.Connect the yellow and green pigtails from the main unit together; only the fan should run. Disconnect the wires.

3.Connect the yellow and blue pigtails from the main unit together; the compressor and fan should run.

4.If these tests work, the main unit is working properly. You should check the control panel and field control wiring for problems next.

5.Remove the control panel from the mounting box and detach it from the field installed control wiring. Connect the blue, yellow, and green wires from the control panel directly to the corresponding colored pigtails on the main unit. Leave the violet, white and red wires disconnected!

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American Aldes DHV-150H specifications Troubleshooting, Unit removes some water, but not as much as expected
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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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