Joe Pattenaude
Activity overview
Latest activity by Joe Pattenaude-
Joe Pattenaude created an article, Application Note: Operating a VFD on a DAB System
Solution On traditional zoned systems with constant volume RTUs, a bypass damper is introduced to keep the duct from overpressurizing during low load conditions. Many old systems are being retrofi...
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Joe Pattenaude created an article, FAQ: How Do I Prevent Cooling When the Outside Air Temperature is Low?
Mechanical lockouts are features in the 75F system, that are introduced to either enable or disable the locking out or shutting down the mechanical cooling and heating systems in the building. The ...
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Joe Pattenaude created an article, FAQ: RTU Is Not Running When It Should Be
In this situation, it's common that the conditioning mode or fan mode may have been set so that the proper mode on the RTU is not available. If you run into this condition, check the following: ...
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Joe Pattenaude created an article, FAQ: VAV has airflow, but 75F DPS is reading 0 CFM
When seeing this condition, check the following: Verify that the green indicator light is blinking. If there is no indicator light, check the cable from the Smart Node to the DPS. If the DPS h...
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Joe Pattenaude created an article, FAQ: Recommended Modbus Baud Rate for CCU
The best baud rate to use for a CCU is 9600. However, you may set baud rates of 19200 or 38400 Follow link below for how to set this in the CCU: Configuring and Pairing Modbus
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Joe Pattenaude created an article, FAQ: Overnight Schedules
In a schedule set until 12:00a, parameters such as desired temperatures, user limits, and/or deadbands, will change to the parameters of the next schedule at midnight, even if the next day's schedu...
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Joe Pattenaude created an article, FAQ: Using a CCU To Control a Single Zone RTU
When using a CCU to control a single zone RTU, use the appropriate DAB System Profile, which may be one of the following: DAB Staged RTU DAB Fully Modulating AHU DAB Advanced Hybrid AHU DAB Exter...
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Joe Pattenaude created an article, FAQ: When to use Zone Schedule vs Named Schedule
Use a zone schedule when any desired temperature adjustments should be maintained across occupied times. Use a named schedule when desired temperature adjustments should revert back to the desired ...
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Joe Pattenaude created an article, 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...
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Joe Pattenaude created an article, 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. -...