In search of PPCL code for co monitoring

[wissahickon]

There is a great energy savings initative here and the latest is for monitoring co levels and deminishing the outdoor make up therfore lowering heating and cooling load. I am insearch of some PPCL code for acomplishing this, there will be at least three sensors in the area (they were pushing for sensors in return duct) which will be averaged to modulate the outside air dampers to the AHU's. Does anyonre have any experience with this?

[ControlsInMT]

Check ASHRAE

[wissahickon]

We are aware of the ASHRAE standards and plan to control to 500 ppm co with an alarm limit of 800 ppm. What I am looking for is a boiler plate for the PPCL any help is much appreciated.

[wissahickon]

Whoops Note CO should read CO 2 or carbon Dioxide

[kc2dnw]

Not sure you will find boiler plate PPCl because by it nature PPCL is customized to your project and your air handler. Maybe if they used CSAL to build it originally, you knew what era of CSAL and that it wasn't modified then you might find something but I don't remember there being an demand ventilation code available in CSAL.

The way I typically do it is to create a loop for my economizer mixed air control (which likely already exists)
Then I create a loop to look at my space CO2 versus my space setpoint
Then I set my mixed air damper to the max of the two when economizer is enabled or just to the co2 loop when economizer is off.

This is a quick sample that shows the basics:

LOOP(0,"%A%MAT","$MATOUT1","%A%MAT.STPT",10000,10, 0,2,50,0,100,0)
LOOP(0,"%A%CO2","$MATOUT2","%A%CO2.STPT",10000,10, 0,2,50,0,100,0)
IF("%A%OAT" .LT. 60) THEN MAX("%A%MAD",$MATOUT1,$MATOUT2) ELSE SET("%A%MAD",$MATOUT2)

-Jeremy