|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 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 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. Current draw is 2.7A at 110 VAC, 14A at 24 VDC, or 6.8A at 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).
Does the VS-24 have control relays and what do they consist of if so?
The VS-24 has two control relays. Both are Form C, SPDT, and can switch 10 amps. Normally, one is used to control the exhaust fan, while the other is for the 2% alarm. The second relay can switch other loads as well, i.e.; a second fan, siren, etc.
Am I able to run duct from the ventilation system?
Yes, the VS-24 is a 2’ standard size for ducting, and exceeds the pressure requirements of NFPA 2.