Original message
| dizzy
 |  "aaf-hermannelson classroom ventilators"
, posted Thu 16 Aug 13:34  
I have a school with classroom ventilators in all the rooms. The supply air temp. is about 10 deg. Differences from room to room. The supply air temp. is 70 deg. In one room and 58 deg. In another. I have about 6 rooms in the 70 deg range and 7 rooms in the 58deg range. The rooms that are getting cool are in the 58 deg. Range and the rooms in the 70 deg. Are so so. The units are aaf-hermannelson classroom ventilators. about 4 years old. There is chilled water supplied to the units the supply water temp is 42deg and return water temp is 46deg. The filters where changed about 3 week ago. The classroom is set to 70 deg. And room temp is 75deg.on the room that are so so thanks for any help jim
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Replies:
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| dizzy
| "Re(1):aaf-hermannelson classroom ventilators" , posted Thu 23 Aug 10:54
The units are controlled by a damper system if it needs more cooling the dampers lets more air in. There are no control valves . But what I found was a screen filter in the supply chilled water line right before the coil and it was clogged. Cleaned it out and working fine thanks for all your in put jim
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| | bigglenn357
| "Re(2):aaf-hermannelson classroom ventilators" , posted Thu 23 Aug 21:31
Good to hear you are back up and cooling!Might want to check them strainers on a monthly period or at least at filter changes as part of pm schedule.
Big Glenn
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| bigglenn357
| "Re(1):aaf-hermannelson classroom ventilators" , posted Fri 17 Aug 18:11
Not familar with name but if its chilled water supply I suspect you have a valve at each unit opening by electric or phnumatics check voltage to valves or air pressure seems to me no water is flowing to the ones with high temps.Make sure valves are opening and see if there are strainers in line that might have a blockage.More info will be helpful.Thanks
Big Glenn
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| | fitter597
| "Re(2):aaf-hermannelson classroom ventilators" , posted Fri 17 Aug 20:44
We have lots of problems with chilled water valves sticking on small vav boxes and fan coils, i'm with Glen
Pipefitters Local 597
" We do it right the first time"
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