New Guest
Hey Folks. I am looking for some Harmony zone controller experience. To sum up a long story, I need to get the Harmony working with a nice dual stage Lennox condenser but a three speed blower in the air handler, not variable. Will essentially be using an older air handler where cooling currently uses fixed high speed, heating uses med speed and low is unused. I know that the Harmony uses a voltage control to tell the air handler where to set the blower, but there must be a way to operate two or three speed blower based on demand level from the Harmony.
So to reiterate into a question, can the Harmony be configured to operate a two or three speed blower?
Professional Member
Your Frankenmonster will give you nothing but problems....Originally Posted by kazko
The 2 speed or dual speen condenser is designed with a varible speed air hanler, not multi speed.
And the harmony works with variable speed blowers, not multi speed. Wont work, your ideas are far fetched.
Get the system installed properly by a contractor. A contractor that will install matching components.
I fully support the military and the War on Terrorism.
If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.
If you do know, then do. But do it right. Otherwise, you may not be doing it long.
Professional Member*
In a word NO!
Professional Member*
What he said! You are looking for nothing but big problems.
Professional Member*
it wont work complete waist of time
God Speed, Jim. We'll miss you - 2-26-23
Would be some awlfull rigging if you got it to work at all.
You won't have humidity control because the blower won't slow down when in first stage.
So your customer will have spent a lot of money on a comfort condenser, that isn't providing comfort. And may end up using more electric, then they did with their old unit.
Tell them you can install a nice VS blower air handler, or sell them a Single stage condenser.
Professional Member*
it could be done but it would be a pita to set up.
could control blower speed with a slave relay tied into condenser control circuit.
no way to control heat blower speed and it would probably need bypass damper or a dump zone.
discharge air sensor to control compressor stages.
Professional Member*
Like my boss tells us "DO IT RIGHT OR GO THE HELL HOME"
So I say no.
God Speed, Jim. We'll miss you - 2-26-23
Blower speed would still be a problem. PSC blowers don't slow enough for first stage.
Professional Member*
they have used 2 stage compressors with psc motors for over 25 years.
it may not be perfect but it would work.
God Speed, Jim. We'll miss you - 2-26-23
I didn't say it wouldn't cool.
But he won't have the humidity control that 2 stage is sold for today.
I've installed 2 stage on standard blower systems.
And everyone of them, lacks the humidty control that a VS blower gives. And doesn't save money like it should for its higher efficiency rating.
Kinda like buying a bolt action shotgun.
Its better then a single shot, but not as good as a pump. But you saved a few bucks.
Professional Member*
the harmony control will be looking for signal from the v-drive controler and will be locking out. It will also be trying to control blower speed and locking out
this system will not work with a three speed motor
there are damper controls that will work and the condenser isnt going to be the issue here it is going to be the blower
Professional Member*
i agree with everything above. it may not be perfect but it can be made to work. the original system in my fathers house was a single speed belt drive blower coil with a hs14 2 speed unit. in new jersey he never had any humidity problems in his house. we don't know where OP is from so humidity may not even be an issue.
i like all the bells and whisles but they are not always needed to get the job done.
i like semi auto shotguns but still like to shoot the old over-under double barrel to.......
God Speed, Jim. We'll miss you - 2-26-23
i like semi auto shotguns but still like to shoot the old over-under double barrel to.......
Professional Member*
what signal does the v drive send to the harmony??
harmony varies voltage on the ds terminal to control blower speed i did not think it recieved any signal......
Professional Member*
was just trying to be simplewhat signal does the v drive send to the harmony??
harmony varies voltage on the ds terminal to control blower speed i did not think it recieved any signal......
with out ds the board will just keep locking out on fault codes. From my understanding since it has been tried and proven it will not work
harmont1 i have done with three speed and also single stage and a lot of thought but harmony3 needs to be set up to control ramping of the blower and if it isnt getting the ramping Or cfm count from the controler it will pick up a fault
now it most likely will open and close the dampers but seems to me this is a bit expensive set up to not be used properly
makes more sense to just use a controler for the damper and let the stat control the condenser
man those old hs14 were great units and the humidity controls were nice also if you but one on it
Posting Permissions
Reply