Abby Normal wrote:

Rod Speed wrote:

Abby Normal wrote

Rod Speed wrote

Corse it will work fine. No reason why the secondary
system cant have a slightly lower than normal temperature
set so it recovers from the setback in a decent time and
then stops and leaves the primary system to get the temp
back up to normal. Thats going to happen fine since the
temp difference is well within its capabilitys.

If you shut the booster off before the central area
gets up to temp and rely on the primary system
then bringing it up to temperature then, this central
area catches up quick compared to the rest of the house.

Wrong. The primary system which keeps the house at a uniform
temp when setback isnt used keeps doing that fine when you
use anything to get the central area back off setback.


Okay, the setback period ends, the primary system is running steady
trying to bring the whole house back up to temperature. Maybe has to
try and bring the whole house up by 5 degrees.

But a second system only serving in the central area also turns on.

So perhaps in one half hours time, the primary system has brought the
whole house temperature up by a degree and the secondary system has
brought up the central area by another 3 degrees.

The secondary system cycles off, and the primary system runs for
another hour has fianlly recovered the 5 degrees of set back. This was
done by the primary system supplying two degrees of reheat and the
secondary system providing 3 degrees of reheat.

But now, you need to think about where that primary system thermostat
is.

If that primary system thermostat is in the central area, it is
satisified. That means the rest of the house gets no more heat until
the central area cools off. So the rooms have recovered two degrees of
heat (actually probably a slight amount more) and the primary system is
off.

So you really need to think, of a better way to control the primary
system it is a doomed system to have the stat in the central area. You
also need to think about how to get extra heat above what the primary
system can normally supply to the rooms to assist them in recovery.


Doesnt matter if thats a ductless split system,
solar, a wood stove, or even a furnace etc.


Hey could be an electric heater in that room, will not work as well as
the strips. Solar will help after your scheme fails, it would warm up
the east rooms anyways.


Not much heat from that booster trickling
into the rooms in that time frame.


When the primary system is running and the central area has recovered,
the average return air temperature to the primary system will elevate
slightly. This results in a slightly elevated supply temperature to the
cool rooms and marginally helps them recover.


Complete pig ignorant drivel.


Maybe the central area gets back 4 out of 5 degrees
in one half hour, and in another hour, the central area
warms up the last degree. Primary system is off.


Maybe read above and other posts and you will finally see the light. I
feel bad beating you up here.


No it aint. Thats why you set the stat on the ductless split system
to a bit below the normal temp that the primary stat is set to.



Try it one more time grasshopper

You set the stat on the ductless split system lower than the primary
system. So the central area was set back to 65F. The primary stat is
set for 70F when setback ends and the ductless split stat is set for
69F when setback ends.

So at the end of the setback period, the room is 65F and that just
happens to be lower than the setting of the primary system stat and the
booster system stat. Guess what, both systems run.

So the primary system puts a portion of its heat output to the central
area and the remainder to the rest of the house and the ductless system
puts its entire heat output in the central area.

The heat output of two systems to the central area, elevates the
temperature area of the central area much faster than in the rooms.

So by the time the ductless system has switched off, the central area
is now 69F and the remainder of the house maybe 66F.

The primary system keeps running and it raisws the central area by
another degree without the help of the ductless system and the central
area is now 70F, and the primary systems TURNS OFF.

In the same time period, the rooms have also been heated by an
additional degree and they are now at 67F. But the primary system is
OFF, until the central area cools off and the primary system comes back
on. But the rooms cool off a little bit too.

So you are not going to recover the room temperature with any success
with the ductless split in the central area only.


The primary system has enough capacity to maintain
the temps properly without setback, the only problem
is that it needs to use the strips to come back off setback
quickly enough. The secondary system JUST replaces
the strips and is a lot cheaper to run than the strips.


No heat to the rooms.

Wrong, as always. Same heat to the rooms
as you get without setback being used.


The rooms will not recover with the auxiliary heat source in the
central area.


So you really need to think about your controls
and where exactly to put that primary stat.

No you dont, whatever works fine with no setback
will still work fine with setback and some system
to replace the strips when coming back off setback.


The central area being warmed up does not help the rooms much, maybe a
4 to 8 percent heat boost to the rooms above what the primary system
would normally supply.


Rooms are no where close to warming up. Only way
to warm up rooms is to over heat the central area.

Thanks for that completey superfluous proof that you have
never ever had a ****ing clue about the basics, and why
the best you have ever managed is drunken HVAC ape.


Strips will warm the whole place up. The ductless
booster can't without overheating the 'core'.


Strips will warm up the whole place-- thats an apple

The booster in the central area will warm up mainly the central area,
that is the pathetic orange. The primary system has warmed up the rooms
as much as it can. The rooms do not benefit much from the central
booster system.

If you elevate the temperature in the central area with the booster
system, then it will help the rooms recover, but it is just a stupid
idea.


Thanks for that completey superfluous proof that you have
never ever had a ****ing clue about the basics, and why
the best you have ever managed is drunken HVAC ape.

Reams of pathetic attempt at a troll that any 2 year
old could leave for dead flushed where it belongs.


I think you should drop the '****ing clue about the basics' from you
repettoire, it makes you look the most foolish of them all.

Read this one over a few times grasshoopper and think.

You seem to be enjoying this
I think he gets that he's cornered, but he's a fighter. He might run out
and bite your ankle though if you keep tormenting him. The fight or
flight response reduces to only the fight response when there is nowhere
to run. A cornered animal would never contemplate defeat, it isn't in
their nature.

hvacrmedic