I've got some series fan powered VAV boxes at a job that used to be controlled by an old C.S.I. system, and have had new johnson controls installed by another company.
They have VMA controllers, and TMZ room sensors.
This is my first time hooking up a laptop to these, or any for that matter, and have some time to kill on this job, so I thought I'd use it as a learning experience, and the customer has been having some problems with these zones.
Everything in the config file looks normal, but there are a couple things about the inputs on these particular controllers that make me wonder what the installer was trying to accomplish.
There is a fan proving current relay installed on BI-1, which I understand is dedicated to the temporary occupancy button on the room sensor.
There is a jumper installed on BI-2, which I understand is meant for an occupancy sensor.
Nothing is attached to BI-3.
In the Q&A list, Sensor for occupancy mode, and it's action = Occupied mode when occupancy sensed.
In the config. parameters, the occupancy mode = occupied, and the occupancy timer is set for 60 minutes.
I only got a quick look at the facitities front end, as it is in a locked room, and the operators are not very friendly, so I don't remember exactly which points are mapped to the front end.
Can anyone explain the logic in this setup?