how does ACC treat the 2 zones? - Saab 9-5 Bulletin Board - Saabnet.com
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how does ACC treat the 2 zones?
Posted by Aero'ed (more from Aero'ed) on Thu, 18 Jul 2002 11:26:19
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I can envision two scenarios:
1.a. All air travels through the cooling coil.
1.b. Air splits into equal amounts for two zones.
1.c. Each zone has its own reheat coil.
1.d. Each reheat coil fluctuates to determine final supply temperature.
2.a. The supply air is split into the two zones.
2.b. The cooling coil and the single heating coil are each split by baffle.
2.c. Each zone varies how its air is sent through its two coils.
2.d. Each zone then remixes the "hot" and "cold" air to obtain desired supply temp.
3.a. All air travels through the cooling coil.
3.b. All air travels through the heating coil.
3.c. The ACC varies the water flow through the htg coil to supply temp. required to meet the needs of the space furthest from its temp setpoint.
3.c. The other zone simply receives less air.
Each scenario varies the overall fan air delivery to treat the space with the greatest need (heating or cooling)
If you're familar with HVAC systems, the first is a constant volume, reheat type, the second like a mult-zone, the third a variable air volume.
Has anybody with the SAAB service CD looked at that section?
If I had to guess, I pick system 1.
Ed 2002 Aero SW expansion valve groan
posted by 66.84.139...
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