Originally Posted by
alcomech
AREA: This is where you will set up temperatures and individual set points related to individual areas. You can set AREAS to control any group independently from other AREAS such as office space, floors, common areas, warehouse, etc. etc. The area itself is unique as your space can be subdivided for individual temperature control, and also has the capability to have different start and stop times. This is helpful when as an example you have subdivided areas and or have different tenants on individual floors or areas which require different schedules such as holidays or if necessary exclusion dates can be created. This information is available for your use at the bottom of the screen located in the help menu. You should familiarize your self with the help screens which are available at all windows. It is very helpful to have more than one AREA so that individual times can be established.
VAS: Variable air volume air systems (VAS) is made up of VAV boxes, air handling equipment which supplies hot or cold air to boxes.
In addition ventilation equipment such as Outside air VAV boxes, make up air fans and building exhaust fans. VAS works with AREA CONTROL where it receives start and stop status through the TIME of DAY SCHEDULING. Remember it is the AREA which helps manage the VAS to control operation of all the VAV boxes and air moving equipment.
VAV boxes are listed as MEMBERS which are related to the VAS and controlled by the AREA which it serves.
This is where you set up the votes for your VAS and when changes are made you will need to reset the votes. This needs to be checked and if not maintained will give you an erratic control which you are experiencing. Such as in the case where a remodel has occurred and originally you had 10 VAV boxes but you now actually have only 8. This will alter your votes.
CPL: Custom Program Language allows for custom programs and calculation which cannot be done in other applications in Tracer summit. This is somewhat difficult to do and changes to CPL are not recommended at first. In order to familiarize your self you may want to open CPL and print out its program. When exiting do not save changes. You should be able to review the list of VAV's and UCM's which will be responsible for the temperature reference. This is accessible and listed in the CPL editor. You will need to locate the VAV's in CPL and verify they actually exist as well as positioned where there temperatures are accurate.
As far as the set up of the DX system you should set the static pressure to 1.5" W.C. which is the design of your VAV box and will give you the best accuracy and a good starting point for the commissioning of your system. This VAV box is capable of working with less static and much more up to 3" but should not be necessary for any setting other than 1.5" especially when balancing.
You will need to verify actual static pressure 2 thirds downstream of the air handler with a Magellanic gauge to confirm accuracy of your set point which controls inlet guide vanes. It is required to have a higher static than some have suggested so that when under a full load you will have an average of 1.5". Unless you want to stand around and regulate this control as needed...Let the equipment do the work. Lowering your static will do nothing whatsoever. As a matter of fact, the higher air static will identify problem areas such as dumping from a VAV box which has a bad motor or air valve. This can be checked by overriding control and closing or opening the air valve and checking air flow at the display.
Your balancing will be set up as two positions- Minimum airflow and maximum airflow. Minimum is based independently for cooling and more important for heating which will require airflow to meet its requirements. You will need to command the VAV's to self calibrate which is done in the set up. This is done by selecting calibration and choosing a Binary output for its operation. You will need to save it and wait a minute. Then choose its reference which is indicated by the threes (...) as its reference.
In addition the calibration should be scheduled to perform by itself which is done through scheduling just like you would start and stop. This may need to be set up in CPL if its not already set up.
It is not recommended to alter the set up for the VAV's other than set them up as their actual size. If you have a 12" round inlet it should be set up to it's corresponding CFM output which is around 2000 CFM. The air flow ring is designed to individually fit each different size box and accurately measure CFM.
I hope this helps.
Trouble shooting is not part of the repair............understand the symptoms and you will find a solution.
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