A/C coil air restriction.
#1
02-27-17, 08:57 AM
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A/C coil air restriction.
Forced air 2-stage Goodman furnace 5 yrs old. Heat flow under stage 2 is pleasantly robust. Example, Removing filter results in very robust heating air flow. Filter creates some air flow restriction. But I understand filter is needed.
If I have ac installed, will this create significant air flow slow down because of a-coil restricting air flow passage? Will it slow down airflow even more in similar fashion as the filter does?
If I have ac installed, will this create significant air flow slow down because of a-coil restricting air flow passage? Will it slow down airflow even more in similar fashion as the filter does?
#2
02-27-17, 09:03 AM
As long as the AC coil is clean it won't lower your air flow enough to cause a problem. What kind of filter are you using?
#3
02-27-17, 05:27 PM
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Allergen pleated.
I like the Robust air flow w/out ac installed. I rarely use ac, but understand will need for resale when the time comes. Thought of getting it over with and installing, but don't want to slow down robust air flow during heating season.
Seems logical that air having to push through narrow fins of ac coil must slow airflow down a bit.
I like the Robust air flow w/out ac installed. I rarely use ac, but understand will need for resale when the time comes. Thought of getting it over with and installing, but don't want to slow down robust air flow during heating season.
Seems logical that air having to push through narrow fins of ac coil must slow airflow down a bit.
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02-28-17, 05:00 AM
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#5
02-28-17, 06:12 AM
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I like the Robust air flow ...
To each their own.
#6
02-28-17, 06:32 AM
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A well designed duct system should handle airflow that shouldn't be noticeable when the equipment is running.
Also, those 1" pleated filters, especially the 3M brand, can severely restrict airflow. I recommend using the cheap 1" fiberglass throw away filters, the ones you can see through. If you require more filtration then move up to a 4" or 5" filter. Remember, the filter isn't there for you, it's there to keep debris out of the equipment.
Any coil will have a pressure drop. Static drop across a dry coil is actually one way to measure airflow. The manufacturer should have a table showing this in the manual and/or on the unit.
You'll want around 350-400 CFM per ton of cooling. The standard is ~400, lowering towards 350 for increased dehumidification.
Also, those 1" pleated filters, especially the 3M brand, can severely restrict airflow. I recommend using the cheap 1" fiberglass throw away filters, the ones you can see through. If you require more filtration then move up to a 4" or 5" filter. Remember, the filter isn't there for you, it's there to keep debris out of the equipment.
Any coil will have a pressure drop. Static drop across a dry coil is actually one way to measure airflow. The manufacturer should have a table showing this in the manual and/or on the unit.
You'll want around 350-400 CFM per ton of cooling. The standard is ~400, lowering towards 350 for increased dehumidification.
#7
03-07-17, 09:42 AM
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If thinking of installing A/C, U need to do a load-calc & Sizing...
The ductwork was probably sized for heating & might be too small when cooling is added.
HVAC Load Calculation - Maunualj - Whole House Loadcalc
Do everything U can to reduce the Btuh needed...
Make sure the duct system is properly sized with efficient airflow components...
The ductwork was probably sized for heating & might be too small when cooling is added.
HVAC Load Calculation - Maunualj - Whole House Loadcalc
Do everything U can to reduce the Btuh needed...
Make sure the duct system is properly sized with efficient airflow components...
