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HVAC Discussions - Heating, ventilation and air conditioning.
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Posted by markgmoody on July 17, 2006, 3:04 pm
Folks,
Could you tell me, in general, how you feel about the following
combination of equipment. I know these are generalities but if you're
looking at Trane gear with these capacities, what if any are the
benefits/drawbacks?
3-ton condenser, SEER 13
3 1/2 ton coil
4 ton blower
80,000 BTU furnace
1500sq 2nd floor
Without being any kind of HVAC expert and without knowing any real
specifics about how you might go about optimally setting the TXV for
this configuration, my initial concern is:
1. blower load raising the avg temp of the coil and significantly
reducing latent heat removal capacity. (but will moving more air across
more coil surface area actually make up for the loss in latent heat
removal caused by higher coil temp?)
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Posted by udarrell on July 17, 2006, 3:51 pm
markgmoody@gmail.com wrote:
show/hide quoted text
>Folks,
>Could you tell me, in general, how you feel about the following
>combination of equipment. I know these are generalities but if you're
>looking at Trane gear with these capacities, what if any are the
>benefits/drawbacks?
>3-ton condenser, SEER 13
>3 1/2 ton coil
>4 ton blower
>80,000 BTU furnace
>1500sq 2nd floor
>Without being any kind of HVAC expert and without knowing any real
>specifics about how you might go about optimally setting the TXV for
>this configuration, my initial concern is:
>1. blower load raising the avg temp of the coil and significantly
>reducing latent heat removal capacity. (but will moving more air across
>more coil surface area actually make up for the loss in latent heat
>removal caused by higher coil temp?)
>
If the blower speed taps work out okay you can reduce the CFM to 350-CFM
per Ton, or 1050-CFM.
That will help to get a colder coil and increase run-time to reduce the
humidity.
If the equipment is sized right it will have adequate runtime to handle
the humidity and RM TH temp settings.
Get a RM TH with at least two degrees differential between the on/off
cycle for longer run-time cycles.
- udarrell - Darrell
--
Air Conditioning's Affordable Path to the "Human Comfort Zone Goal"
http://www.udarrell.com/air-conditioning-total-heat-enthalpy-latent-heat.html
For HVAC Techs:
http://www.udarrell.com/ac-trouble-shooting-superheat-subcooling.html
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>Could you tell me, in general, how you feel about the following
>combination of equipment. I know these are generalities but if you're
>looking at Trane gear with these capacities, what if any are the
>benefits/drawbacks?
>3-ton condenser, SEER 13
>3 1/2 ton coil
>4 ton blower
>80,000 BTU furnace
>1500sq 2nd floor
>Without being any kind of HVAC expert and without knowing any real
>specifics about how you might go about optimally setting the TXV for
>this configuration, my initial concern is:
>1. blower load raising the avg temp of the coil and significantly
>reducing latent heat removal capacity. (but will moving more air across
>more coil surface area actually make up for the loss in latent heat
>removal caused by higher coil temp?)
>