Re: Carrier moduline 37A VAV
Goodness me, these take me back far to many years.
http://eto.carrier.com/lit2.asp
You can download manuals for the different 37A models at the above site.
Seems like you've started the correct way however have you checked the main AHU performance such as, duct pressure controlled within the design requirements.
The supply air temperature can also be adjusted for the season.
Generally if the units do not control the airflow then check the filters, air flow regulator and the thermostat. Ensure that all control tubing is correctly fitted and/or plugged as needed.
The first check is to set the thermostat to maximum so that the unit goes to minimum airflow.
I would suggest that if possible try to find a unit that you can work on without being disturbed or disturbing the occupants. Check duct pressure and airflow from the unit.
Remove and check the controller items, refit and test.
Good luck.
Re: Carrier moduline 37A VAV
Thanks for your help brian.
After spending a good few hours checking over a few different units it became clear that to get the Moduline set up back to how it should be would very costly and time consuming!
It seems a large number of them are suffering from bellow leaks and therefore not able to fully inflate to dampen down the air flow through the moduline, this in turn seems to cause the AHU supply fan to ramp up to a high speed and throttle air throughout the building creating a lot of noisy units. It was also discovered that numerous filters have clearly passed there serviceable life span and need replacing and all of which comes at a cost so... still, Not bad for a installation that dates back to 1986
Re: Carrier moduline 37A VAV
Sounds like normal non-maintenance of a Moduline system and yes, someone is going to be spending a lot of money to get it back as it could/should be.
Good luck with it.