3.5B Ducting for Dehumidification
Ducting the Vehere as mentioned requires consideration of the following points:
The Vehere will require a single 12” round or equivalent dedicated return from the pool room. The Vehere supply can be dedicated or tapped into a forced air system supply. A check damper should be used at the connections.
The warm/dry supply air should be washed over the windows at multiple drops for best results. Grills and diffusers or duct ends must not excessively restrict airflow.
Round flex duct can be purchased by ordering the following part numbers from the factory:
4020647 | 4” Flex Duct | 4” x 25’ |
4020128 | 6” Flex Duct | 6” x 25’ |
4020177 | 8” Flex Duct | 8” x 25’ |
4022126 | 10” Flex Duct | 10” x 25’ |
4024750 | 12” Flex Duct | 12” x 25’ |
4 Operation
4.1 Humidity Sensor/Control
The control is an adjustable switch that closes when the relative humidity of the air it senses rises to the dial set point. It opens when the RH drops 4 to 6% below the set point. (See Fig. 9)
Figure 9: Vehere humidity sensor/ controller.
4.2 Humidity Control Adjustment
The dehumidifier will run until the desired relative humidity (RH) matches the control dial setting.
The humidity controller has been designed for simplicity of use. It is marked “Low”, “Normal” and “High.” These operational settings represent the amount of humidity in the air. Setting the control to the “Low” setting will result in a lower relative humidity than the “High” setting. We recommend setting the controller at the “Normal” setting and then adjusting as you see fit, moving the controller toward “Low” to lower the humidity and toward “High” to increase the level of humidity in your pool or spa area.
Approximate Humidity Levels Per Setting
“Low” | 35% to 45% | Relative Humidity |
“Normal” | 45% to 55% | Relative Humidity (Recommended) |
“High” | 55% to 65% | Relative Humidity |
A quality humidity meter is recommended to accurately monitor humidity levels. For a quote on a quality humidity meter, contact customer service at
4.3 Fan Switch
Turning the fan switch ON will cause the unit’s internal blower to run continuously, whether the unit is dehumidifying or not. This function is desirable if the unit is used for air circulation or fresh air ventilation.
(See Fig. 10)
Figure 10: Vehere fan switch.
4.4 Automatic Defrost Control
When the Vehere is used in a cool area, frost may form on the cooling coil as it dehumidifies. When frost forms, our automatic defrost thermostat will periodically turn off the compressor while allowing the blower to run. The blower draws air through the cooling coil and melts the frost. The defrost cycle is automatic and designed for optimum performance above 50°F.
4.5 Automatic Low Pressure Control
If the low side refrigerant pressure drops to 15 PSIG, the low pressure control opens and shuts off the compressor and blower. It is an automatic reset that will close when the pressure rises to 35 PSIG. This feature prevents damage to the compressor. It may also open if the unit is used in a cool area (below 50°F) or stored below 40°F and then started. Under these conditions, the unit will restart within several minutes.
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