Prestige IAQ on Two Step Compressor w/ Variable Speed Furnace


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Old 06-28-18, 06:52 AM
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Lightbulb Prestige IAQ on Two Step Compressor w/ Variable Speed Furnace

Looking for help with wiring Honeywell Prestige IAQ with two step scroll compressor with variable speed furnaces.
I have two different systems. Upstairs unit is a 2 ton unit, Downstairs is a 4 ton unit.
I made the diagrams with the Honeywell EIM pictured, but right now I have Ecobee's on the units.
Basically would like verification to the way they SHOULD be hooked up with the Honeywell EIM's.

Condenser - American StadardAllegiance 16 4a7a60 4 ton unit downstairs
2 ton upstairs.

Furnace - Freedom 80 Comfort R VS on both units.

the upstairs 2 ton unit is wired as Diagram #2 shows.
https://www.amazon.com/photos/share/...mJGrdVFK37S5Kb
Furnace DD100R9V3 dipswitches set to 2 ton( 1off, 2on) , CFM set to 400cfm per ton (3off,4off) , Comfort R On ( 5on, 6on), Heating at Normal (7on, 8off)


The Downstairs unit would be wired as Diagram #1 is shown
https://www.amazon.com/photos/share/...MXYCO23zMAeQND

Furnace DD100R9v5 dipswitches set to 4 ton (1on,2off), CFM set to 400cfm per ton (3off, 4off), Comfort R On (5on,6on) , Heating at Normal (7on, 8off).


I would like to setup Dehumidfy on Demand on the downstairs unit. Could I do a Diagram #3?
Could I do the same upstairs by hooking up U1 to the BK terminal ?

Also, could anyone explain to me why the R to O jumper is installed on both systems?


Thanks.
 
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Old 06-28-18, 07:29 AM
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Also, R to BK jumper on LVTB is cut on downstairs unit.
 
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Old 06-29-18, 12:47 PM
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Can i use a TRANE thermostat on an American Standard HVAC?

Refer to the wiring diagram on post 6.
 
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Old 06-29-18, 03:25 PM
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So Ylo would call for 50% speed but since these units want 80% and 100% the Y calls for 80% and the BK calls for 100% blower speed? So for the dehumidify on demand, removing the power from BK would drop it back down to 80%? Also from what I've been reading, the energizing O from R ... O activates the blower profiles? So energizing O would Turn the Comfort R ramp profile on? I appreciate all the help Houston! Trying to understand the Terminals better and how they affect the blower speeds.
 
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Old 06-30-18, 03:27 AM
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In low speed it would be even lower.
If the airflow is too low the compressor will end up trying to compress liquid refrigerant.
That would result in early compressor failure.
 
 

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