2.0 Ton AC Unit with larger coil

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  #1  
Old 08-05-06, 11:30 AM
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2.0 Ton AC Unit with larger coil

AC installer is suggesting we should get 2.0 ton ac unit with bigger coil- the coil used for 2.5 ton. The reason he gave was since house is a corner lot with lot of windows and it is 1920sf in size will need bigger coil or 2.5 ton AC. If we donít want 2.5 AC than we should go with bigger coil instead at least.

My question is it is common to do that? Does 2.0 ton fan and compressor has to work harder for larger coil unit? Your comments are appreciated.
 
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Old 08-05-06, 11:46 AM
Ed Imeduc's Avatar
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First where are you??? 2 ton for 1920 sq ft is a little small .But did he run a AC load on the home???. Yes we sometimes put the next size up coil on a unit. But you have to know what you are doing. Do you need more heat or more AC??? Can the blower take on the 2 1/2 ton unit???

ED
 
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Old 08-05-06, 01:47 PM
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I am in Toronto, Canada therefore we need more heat than AC. We already have a high efficiency furnace installed by the builder. It is a new home never lived in therefore no AC test was done on it.

Installer 1st wanted to go with 2.5 ton then he said since Toronto is not the hottest place around let me give you bigger coil to compensate for hotter days.

I am getting 2.0 ton Keeprite model C2A3. I am told the AC has two speed fan with 800 rpm high.

Let me know if you need to more anything more to make a better suggestion.

Thanks
 
  #4  
Old 08-05-06, 02:29 PM
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Well for there can go the 2.5 ton coil but Id only go a SEER of 13.
Now that RPM of 800 you sure its not 800CFM?
If you go that 2.5 ton coil you should need a 1000 CFM on the blower . He can put a 3 speed blower in there

ED
 
  #5  
Old 08-05-06, 05:22 PM
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Following is the cut-n-paste of specs. Let me know what you think?


C2A324GKA 2 24,000 18.3 30  x 31 x 32 206 / 178


PRODUCT SPECIFICATIONS Split System Air Conditioner: C2A3
421 56 5300 00 Specifications subject to change without notice. 3
PHYSICAL DATA
Model Size 18 24 30 36 42 48 60
Nominal Cooling Capacity (BTU/hr) 18,000 24,000 30,000 36,000 42,000 48,000 60,000
Nominal SEER 13.0 13.0 13.0 13.0 13.0 13.0 13.0
Sound Rating (dBA) 73 73 75 75 76 76 76
PSC Fan Motor HP 1/12 1/8 1/8 1/5 1/4 1/4 1/4
Fan RPM (High / Low) 800 800 800 800 800 800 800
Fan CFM 2140 2470 2470 3270 3670 3670 3670
Coil Face Area (ft2) 14.47 14.47 14.47 24.40 16.26 18.30 24.40
Coil Rows − fins per inch 1 − 25 1 − 25 1 − 25 1 − 25 2 − 20 2 − 20 2 − 20
Liquid Line Connection Size (in.) 3/8 3/8 3/8 3/8 3/8 3/8 3/8
Vapor Line Connection Size (in.) 5/8 5/8 3/4 3/4 7/8 7/8 7/8
Recommended Line Set Liquid Tube
Diameter (in.) 3/8 3/8 3/8 3/8 3/8 3/8 3/8
Recommended Line Set Vapor Tube
Diameter (in.) 5/8 5/8 3/4 3/4 7/8 7/8 1
Factory Charge R−22 (lbs.) 4.56 5.38 5.38 8.13 8.33 11.00 13.60
Required Subcooling (įF) 10 9 11 9 9 12 13
Weight, shipping (lbs.) 202 206 206 264 280 300 314
Weight, operating (lbs.) 174 178 178 229 247 266 279
 
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