Joe Pattenaude
Articles
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FAQ: 75F Product Power Ratings/Requirements
When laying out power supplies for 75F devices, it's important to ensure transformers are sized for the demand. The following are the recommended design power for each device: CCU: 24V AC/DC (+/-...
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Application Note: Restricting Times for Custom Alerts
Problem: In a traditional BAS setup, alerts can be generated 24/7. But what if you only want alerts to generate during unoccupied times when there is nobody in the building? An example: A restaura...
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Application Note: One AHU Serving Multiple Floors of VAVs
Current Standard Solution: 75F offers a VAV sequence in which the zones and the systems work together to achieve a perfect balance of comfort and energy. This works by all zones will reporting d...
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FAQ: Recommended 24v and Control Signal Cable
24VAC Power Wire: 18 AWG, 2 conductor Non-Shielded Plenum Rated, Solid Copper Conductors Red/White conductors Red (24V), White (C) DC Power: 18 AWG, 2 conductor Non-Shielded Plenum, Solid Copper...
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Application Note: Controlling a FPVAV with Multiple Stages of Reheat
Problem: It's common to see VAVs with fans and/or multiple stages of heating. The SmartNode only has two relay outputs. So using 75F, how would we control the equipment in the scenario that there...
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Application Note: Air Cooled Chiller Plant with 2 Chillers
Solution: Using a 75F Edge 10, an Air Cooled Plant can be controlled in the form of a simple configurable controller. The Edge 10 will come pre-programmed for a true plug-and-play experience and w...
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FAQ: Do I need 2 airflow sensors for every VAV with SmartNodes?
Yes! For heating, ASHRAE Guideline 36 specifies the following sequence: - When the Heating PI Loop is between 0% and 50%, reset the VAV discharge air temperature setpoint from minimum to maximum. -...
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FAQ: Recommended RS-485 Cable Specs and Installation Requirements
Cable Specs:22 AWG with (1) Twisted Pair + 1 Conductor ShieldedPlenum rated where requiredImpedence of between 100 and 130 ohmsCapacitance between conductors of less than 30 pF per foot (100 pF per...
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Application Note: Using Return Air for Space Temperature with HyperStat
Problem:In certain scenarios, there may not be a cable path to an area that a RTU or AHU serves, or it may not be in an architecturally desirable location for wall sensors. In this case, it makes ...
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Required Component Specifications
When using Non-75F manufactured sensors on 75F products, the following are the minimum specifications in order to remain compliant with 75F standards. If installed components do not meet/exceed t...