If you were Registered and logged in, you could reply and use other advanced thread options
|
Posted by on August 4, 2005, 2:21 pm
On Thu, 4 Aug 2005 15:09:08 -0400, "Carolina Breeze HVAC"
>
>
>You unblance the air flow that was designed into the ductwork.
>Now, that said, mobile home units are different animals.
>What the OP needs to do, since the air handler that is in the unit is made
>to operate on a higher static, is to start with the ducts closest to the air
>handler, and almost close them, not fully, but almost. As he gets farther
>from the unit, (air handler) the ducts should be progressivly open till the
>registers at the farthest end, are open all the way. Air, being fluid, goes
>for the path of least resistance, and this will insure max air flow to the
>farther ends of the home, while still allowing for cooling and heating to
>take place.
>
Thats basically what I ended up doing.
I closed the vents closest to the furnace intake.
Full-open the ducts furthest away.
House temps feel alot more balanced room-to-room now.
<rj>
|
|
Posted by Edwin Pawlowski on August 4, 2005, 7:07 pm
> I could never understand this, when you close off unused rooms aren't you
> lessening the load on the system over all? In heating and
> air-conditioning? Or is it worse for one verses the other??
>
> Thanks, Rich
Yes, you are, but the systems are designed to run at a certain capacity. If
the capacity is not used, they will cycle more frequently. Is that bad?
Depends. Compressors are often rated at X starts per hour.
You have to understand about load on the system. With few exceptions of
some variable machines, the heater or AC compressor is either off, or it is
on. The thermostat is a switch that turns it off or turns it on. There are
those people that when chilly will turn the thermostat up higher thinking it
will heat faster. No, it won't. When you turn on a light in a room, it is
on. Pushing the switch harder does not make it brighter. Same with a
heating and cooling systems. Burner on is putting out full capacity.
Shutting down dampers will change the air flow and static pressure on the
blower. If it has a lot of resistance, it can actually work harder trying
to overcome the blocked vents as it would just blowing and circulating the
air. Just like blowing through a straw, bigger is easier.
Ed
|
|
Posted by RP on August 5, 2005, 1:46 am
Edwin Pawlowski wrote:
>
>>I could never understand this, when you close off unused rooms aren't you
>>lessening the load on the system over all? In heating and
>>air-conditioning? Or is it worse for one verses the other??
>>
>>Thanks, Rich
>
>
> Yes, you are, but the systems are designed to run at a certain capacity. If
> the capacity is not used, they will cycle more frequently. Is that bad?
> Depends. Compressors are often rated at X starts per hour.
>
> You have to understand about load on the system. With few exceptions of
> some variable machines, the heater or AC compressor is either off, or it is
> on. The thermostat is a switch that turns it off or turns it on. There are
> those people that when chilly will turn the thermostat up higher thinking it
> will heat faster. No, it won't. When you turn on a light in a room, it is
> on. Pushing the switch harder does not make it brighter. Same with a
> heating and cooling systems. Burner on is putting out full capacity.
Not as a general rule, since many systems are staged.
>
> Shutting down dampers will change the air flow and static pressure on the
> blower. If it has a lot of resistance, it can actually work harder trying
> to overcome the blocked vents as it would just blowing and circulating the
> air.
Doesn't work that way. The blower will unload with greater static.
Just like blowing through a straw, bigger is easier.
Lower resistance with a constant applied force means more work, not less.
hvacrmedic
|
|
Posted by Richard Perry on August 5, 2005, 1:50 am
Edwin Pawlowski wrote:
>
>>I could never understand this, when you close off unused rooms aren't you
>>lessening the load on the system over all? In heating and
>>air-conditioning? Or is it worse for one verses the other??
>>
>>Thanks, Rich
>
>
> Yes, you are, but the systems are designed to run at a certain capacity. If
> the capacity is not used, they will cycle more frequently. Is that bad?
> Depends. Compressors are often rated at X starts per hour.
>
> You have to understand about load on the system. With few exceptions of
> some variable machines, the heater or AC compressor is either off, or it is
> on. The thermostat is a switch that turns it off or turns it on. There are
> those people that when chilly will turn the thermostat up higher thinking it
> will heat faster. No, it won't. When you turn on a light in a room, it is
> on. Pushing the switch harder does not make it brighter. Same with a
> heating and cooling systems. Burner on is putting out full capacity.
Not as a general rule, since many systems are staged.
>
> Shutting down dampers will change the air flow and static pressure on the
> blower. If it has a lot of resistance, it can actually work harder trying
> to overcome the blocked vents as it would just blowing and circulating the
> air.
Doesn't work that way. The blower will unload with greater static.
> Just like blowing through a straw, bigger is easier.
Lower resistance with a constant applied force means more work, not less.
hvacrmedic
|
|
Posted by RP on August 5, 2005, 1:52 am
Edwin Pawlowski wrote:
>
>>I could never understand this, when you close off unused rooms aren't you
>>lessening the load on the system over all? In heating and
>>air-conditioning? Or is it worse for one verses the other??
>>
>>Thanks, Rich
>
>
> Yes, you are, but the systems are designed to run at a certain capacity. If
> the capacity is not used, they will cycle more frequently. Is that bad?
> Depends. Compressors are often rated at X starts per hour.
>
> You have to understand about load on the system. With few exceptions of
> some variable machines, the heater or AC compressor is either off, or it is
> on. The thermostat is a switch that turns it off or turns it on. There are
> those people that when chilly will turn the thermostat up higher thinking it
> will heat faster. No, it won't. When you turn on a light in a room, it is
> on. Pushing the switch harder does not make it brighter. Same with a
> heating and cooling systems. Burner on is putting out full capacity.
Not as a general rule, since many systems are staged.
>
> Shutting down dampers will change the air flow and static pressure on the
> blower. If it has a lot of resistance, it can actually work harder trying
> to overcome the blocked vents as it would just blowing and circulating the
> air.
Doesn't work that way. The blower will unload with greater static.
> Just like blowing through a straw, bigger is easier.
Lower resistance with a constant applied force means more work, not less.
hvacrmedic
|
Page 2 of 2 << first < 1 2
| Similar Threads | Posted | | please post your HVAC questions to alt.hvac | December 6, 2005, 11:18 pm |
| HVAC questions welcomed at alt.hvac | December 27, 2005, 11:10 pm |
| Info: | August 15, 2006, 1:14 pm |
| Info please | January 24, 2007, 4:30 pm |
| Thanks for All the Info | August 6, 2007, 9:42 pm |
| Info tip- panelling job | July 19, 2008, 1:18 pm |
| Brick Info | November 9, 2005, 6:41 pm |
| GSX9885jq0 info? | November 11, 2005, 5:12 pm |
| Tin Ceiling info... | November 28, 2005, 6:26 pm |
| info of visa | March 18, 2007, 12:09 am |
|
|
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap