EHV - Humidity-controlled valves

The EHV extraction unit provides intelligent control of extract air according to need. The resulting system both provides optimum energy consumption and helps to create a better indoor climate.

Application
EHV is especially suitable for bathrooms and environments that require increased airflow when there are high humidity levels in the room.

Product description
The EXHAUSTO EHV extraction unit has a patented humidity control, which uses forced airflow when humidity increases. The unit self-adjusts to normal airflow as humidity decreases. The patented humidity control mechanism is mechanically actuated and requires no power supply or battery. However, models with forced extraction, via an external signal or motion sensor, will require power supply, via a battery or transformer.

The unit is  permanently set to force air when relative humidity reaches 40%. The unit's damper is made of two parts. One half of the damper can be adjusted for six basic levels of airflow. The other half of the damper provides extra forced air. The total airflow is the sum of the basic and the forced airflow.

EHV

The EHV valve is available in 4 variants with different override principles. Get an overview of the variants below or read the detailed description beneath the table.

* Option for replacing batteries with 12VAC power supply, EHV Supply Card

Generally, for all tree models:

All EHV valves consist of two damper plates, one permanently fixed for basic ventilation (can be set in positions 0 to 5) and one variable plate controlled by the relative humidity. The humidity-controlled damper plate will start to open at 40% RH and will be fully open at 85% RH.

Function description of the individual models:

EHV-B

Humidity-controlled extraction unit

EHV-S

Humidity-controlled air extraction unit overridden by an external ON/OFF switch. The two cables from the EHV are routed to a single-pole switch. When contact is made, the valve will open the humidity section to max. after approx. 1 min. When the contact is broken, the damper plate will close again after 20 minutes - unless the humidity is so high that this damper section remains partly open.

EHV-P

Humidity-controlled air extraction unit overridden by an integral PIR sensor. The PIR sensor must be activated via movement twice, with a maximum of one minute's interval, in order to make the contact. When contact is made in the PIR sensor, the valve will open the humidity section to max. When the contact is broken, the damper plate will close again after 20 minutes - unless the humidity is so high that this damper section remains partly open.

EHV

EHV - Capacity

Setting basic airflow

The fixed damper can be set to six different positions:

• To change the required airflow
• To adjust to the available pressure

 
The damper is set manually and locked using the supplied locking-pin in order to avoid the damper setting being changed by accident, e.g. during cleaning.

The damper is factory-set to position 0, which is min. airflow. Moving the damper position down allows a higher airflow. Each separate step increases airflow by approx10 m3/h (maximum = 50 m3/h)

EHV, airflow dependent on % RH at 30 Pa

EHV, airflow dependent on %RH at 100 Pa

Sound data for EHV valve

EHV

Mount the EHV valve to the wall or ceiling duct with a metal fire protection panel (FPP) which simultaneously protects the duct system in accordance with DS428 (Technical measures for fire protection of ventilation systems).

FPP100

Panel includes spigot with rubber seal for airtight fitting in a Ø100 mm duct.

FPP125

Panel includes spigot with rubber seal for airtight fitting in a Ø125 mm duct. 

FPP

Panel for fitting to another type of duct opening:
- Rectangular from 67 x 75 mm up to 75 x 67 mm
- Circular from Ø88 up to Ø100 

It is important to adjust the valve to match the required airflow.

Step	What to do	Illustration
1	Remove the white locking pin Use it to fix the "humidity-sensitive airflow" in the minimum position (see illustration). Tip: Use your fingers to push the humidity-sensitive bar in order to close the motor-driven damper.
2	Register the pressure by fitting a manometer as shown on the illustration. Look up the initial adjustment diagram in guidance 3004062 (link at right). Use the registered value to locate the pressure and airflow in relation to the fixed damper position (0-5).

Accessories for EHV fitting

Grease filter EHV-GF

EHV-GF grease filter with plastic frame The filter is placed over the EHV fitting to create a grease filter in front of the valve.   Dimensions L x W X D: 185 x 260 x 80 mm