2005年1月26日 · VVT = variable volume and temperature this unit will maintain the static pressure in the ductwork either with a variable frequency drive or bypass damper. The VVT system doesn't maintain a 55 degree discharge it can be in either heat mode or cool mode which ever it needs to maintain the temperature in the space.

2006年1月17日 · VVT (or pressure dependant VAV) are not systems that are easy to control. You're usually dealing with small, staged, fast acting RTU's and sloppy boxes. If you tighten the operating parameters, the system will be a source of frustration but if you back off and let things ride a bit, they'll do the job they were supposed to.

2014年11月19日 · These VVT design flaws are not just a Carrier issue, the entire VVT Sequence and design concept is a failure of correct mechanical engineering multi zone engineering; The VVT sequence design was originally conceived to be the lowest "first cost" on HVAC multi zone construction projects

2024年5月29日 · Handle the CCN VVT Linkage as if was installed on a third-party RTU like a Trane RTU. The CCN VVT Zone Controllers are designed to work without CCN Linkage to a CCN RTU with third-party RTU's ..... Add a PAT sensor to the master vvt zone of each system. Less than $20.00 and an hour labor.

2008年10月13日 · Carrier used to have an option with their older Gen 2 VVT. You could configure them as a Fan Powered Mixing Box series or parallel. I believe the sequence would be the VVT zone controller will energize the fan relay as 1st stage heat when the heating demand rises 1.5 Deg above the occupied heating setpoint.

2010年5月19日 · Had a few places that the VVT had died , customer did not want DDC or COMPUTER interface , wanted a system that worked and was reasonably priced. I put in JACKSON SYSTEMS comfory system. All the exsisting wiring was reused , bit cleaned up and some repaired from being WORKED on over the years but start up was without any glitches.

2014年10月13日 · Also on a side note I was looking at the control programs loaded into each of the controllers. Most of them are vvt_zn_iv6-3_06_20131017. Which two of these controllers are having issues. I have one controller that is a vvt_zone-2_20100408. Most of the other types of controllers on site have 2010 programs in them. What is the difference?

2010年4月19日 · a bypass is just a component of a vvt system, to dump air into the return instead of a vfd. that is in a nutshell!!!!! VAV stands for Variable Air Volume. VAV boxes provide constant or variable air depending on the temperature demands of the space. As the temperature rises the VAV damper opens to send a designed amount of airflow to the room.

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2013年2月4日 · Hey guys and gals I'm trying to intergrate my current BMS to take over some Automated Logic vav's,vvt's, and fcu controllers. I was able to probe the controllers and get most of the points except the temp setpoints. I am able to program and read the other I/Os.