VS-24 Gas Ventilation System
Model # VS-24
The Eagle Eye VS-24 Hydrogen Gas Ventilation System is a forced ventilation fan system used in battery charging rooms and other areas where hydrogen may be present. This is to be used in conjunction with the HGD-2000 Hydrogen Gas Detector. The HGD-2000 is mounted in the highest part of the room and the VS-24 vent fan is mounted through the outside wall. The system is NFPA (National Fire Protection Association) Compliant.
The system has four fans factory-rated at 850 CFM each. This conforms to N+1 for 2550 CFM. The vent is equipped with a "Positive Airflow Shut Off" feature. These doors can be closed by an external electric command, and will stop any airflow from passing through the fans. The vents can be daisy chained; more than one vent can be controlled by one HGD-2000 H2 gas detector and more than one HGD-2000 gas detector can activate a vent. The unit is primarily set up to exhaust air but can be reversed to source forced air into a room. The VS-24 and HGD-2000 are designed with flexibility in mind.
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|Connections:||Input: Positive shutoff control, N.O. Dry Contacts|
Output: 1% Fan Running, 2% Alarm, N.O. Dry Contacts
|Mounting:||(4) 38 mm (1.5 in) Standard 607 mm (24 in)|
|Positive Shut-Off:||Dry contact activated, manually reset|
|Dimensions:||H x W x D: 610 x 610 x 450 mm (24 x 24 x 18 in)|
|Weight:||Fan: 23 kg (51 lbs)|
Rain Shield & Damper: 10.9 kg (24 lbs)
|Safety Standard:||(4) fans rated at 850 CFM Total 3400 CFM|
N+1 (3) Fans at 850 CFM Total 2550 CFM for 777 sq. m (2550 sq. ft)
|Options:||Mounting wing placement, room exhaust source, small or large rain|
shield, N.O. to N.C., custom features on request
|Certifications:||Class 1 Division 2 Group B motor|
What are some common applications areas for this product?
Common applications include but are not limited to:
- Utilities and Power Plants
- UPS Power Systems
- Fuel Cell Test Stations
- Nuclear Waste Reforming
- Hydrogen Refueling Stations
- Fire Department
- Battery Suppliers
- Battery Charging Rooms
- Motive Power
- Golf Cart
What are the benefits of installing a VS-24 ventilation system?
In rooms with battery charging systems or other areas where hydrogen gas may be present, it is extremely important to remove the hydrogen gas from the area before it builds up and creates unsafe environments. The VS-24 ventilation system is to be used in conjunction with our HGD-2000 hydrogen gas detectors in order to ventilate hydrogen out of an area once it is detected. If a room has hydrogen gas buildup, the HGD-2000 gas detector will turn on the ventilation fans when the atmosphere reaches 1% hydrogen concentration. Alarms will also sound at 2% concentration. Both of these would have been well before the lean mixture of hydrogen could ignite. During this period of time, the fans will be operating to vent the hydrogen gas, so that the area is kept safe.
What are the power requirements for the VS-24?
There are a few different input power options available to choose from for the VS-24. Available power options are 110 VAC, 24 VDC, or -48 VDC.
Can I connect multiple ventilation systems to a single hydrogen gas detector?
Yes, the vents can be daisy chained so that multiple vents can be controlled by a single hydrogen gas detector. Also, multiple hydrogen gas detectors can be set up to activate a single vent.
Can the ventilation system be set up in the reverse direction (forcing air inside)?
Yes, the unit usually is set up to exhaust air out of the room, but can be factory configured to force air into a room if necessary.
Why must the Positive Airflow Shut Off be manually reset?
If a thermal event occurs and proceeds into a fire, the fans will turn off and the Positive Airflow Shut Off feature will close. This will prevent air passage through the fan, which would draw oxygen-rich air into the burning room and feed the fire. When the Positive Airflow Shut Off feature is activated, air pressure from the fans, and gravity, will act to close the positive shut off doors and keep them closed. The Positive Airflow Shut Off must be manually reset in order to prevent inadvertent reset in an actual fire.
Are the conductors between the VS-24 and HGD-2000/HGD-3000 considered power limited circuits?
Yes, all wires between the units are signal wires (they do not carry large currents).
- Compliance with IEEE Std 450
- Compliance with National Fire Protection Agency (NFPA) Article 64
- Compliance with Uniform Building Code (UBC) Section 6400
- Automatic Operation and Continuous 24/7 Monitoring
- High Sensitivity and Stability
- Long Life-Span for Reliable Monitoring
- Inexpensive protection for equipment and personnel
- Two-Year Warranty
The VS-24 Includes:
- VS-24 Unit
- User Manual
If a battery room has hydrogen gas buildup, the HGD-2000 gas detector will turn on the fans when the atmosphere reached 1% hydrogen. Alarms will sound at 2% concentration. This is before the LEL of 4.1%. During this time, the fans will vent the hydrogen gas. If a thermal event occurs and proceeds into a fire, the fans will turn off and the Positive Airflow Shut Off feature is closed. This will prevent air passage through the fan, drawing oxygen-rich air into the burning room. When the Positive Airflow Shut Off feature is activated, air pressure from the fans, and gravity, will act to close the positive shut off doors and keep them closed. The Positive Airflow Shut Off must be manually reset to prevent inadvertent reset in an actual fire. Louvered dampers on the exterior of the VS-24 will prevent domestic air from escaping from the room during non-operation. The fans will blow these louvered dampers open and gravity will close them. These louvered dampers do add a restriction to the airflow and will decrease the CFM.
The VS-24 gas ventilation system comes as three separate pieces. The unit that is installed in the battery room is a 24" x 24" square. A clearance of four feet is recommended from the wall in front of the unit. There is a flange that is factory adjustable and normally located six inches from the back of the unit. If the wall is concrete, the VS-24 is attached by using normal fasteners. The second part of the unit is a louvered damper and the third is a jack which provides environmental protection for the outside of the unit.
Additional options include mounting wing placement, room exhaust or source, small or large rain shield, N.O. to N.C. and other custom features on request. Properly installed, the VS-24 system is compliant with the National Electric Code (NEC) Section 480.9 (A) for ventilation of battery rooms. This is also the specific requirement for solar or wind-generated powered battery rooms.
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