White Rodgers Thermostat 1F95-1291

[beenthere]

All VS blowers can accept a signal from a stat to slow down for dehumidification.

[54regcab]

Will the Goodman VS go over the "standard" 400cfm/ton if dehumidification is not needed? Say the day is dry and hot and the unit runs a runs a lot. Humidity is set at 50%, but since the unit has run so much that day the indoor humidity is actually 40%. Assume 2 ton condenser and a "3 ton/1200cfm" blower. Can the Goodman be set up to run the blower at the full 1200cfm (600cfm/ton) to maximize sensible capacity since dehumidification is not needed? How about running the blower @ 600cfm (300cfm/ton) on really muggy days or when the cycles are relatively short? It seems like the HVAC industry could really improve real world SEER ratings while maintaining comfort by dynamically adjusting CFM/ton depending on load conditions.

[beenthere]

Nope, none of them will do that. And at 1200 CFM, even when its low humidity in the house, you would lose capacity from the air moving through the coil too fast.

Don't try to reinvent the wheel.

[54regcab]

Can somebody help me understand this about how the internal humidity control works? I'm not clear by reading the description what the difference between OC and OD is. OD can reduce the temperature by up to 3 degrees to dehumidify but OC cant? Neither mode will start the AC for dehumidification unless there is a call for cooling?

Programmable Dehumidification Optimal Comfort
Mode (OC) or Optimal Dehumidification (Od) – This
item can be selected to OC (Optimal Comfort mode), Od
(Optimal Dehumidification), or OFF.

When Optimal Comfort (OC) is enabled, this feature automatically reduces
indoor humidity with a call for Cooling if humidity is 2%
above humidity setpoint. Humidity is set by pressing the
Humidity key when in the appropriate mode, in this case
Cooling, and pressing the up or down keys to set desired
humidity (range 40% to 95%) level followed by pressing
Humidity key again. This dehumidification feature uses
less energy by maintaining temperature and dehumidify-
ing only when a call for Cooling is required.

Optimal De-humidification (Od) when enabled, this feature automatically
reduces indoor humidity with a call for Cooling if humidity is 2% above setting.
Humidity is set by pressing the HUMIDITY key when in the appropriate mode, in
this case Cooling, and pressing the up or down keys to set
desired humidity level followed by pressing Humidity key
again. This dehumidification feature may use more energy
by making dehumidification a priority initiating a call for
cooling if humidity is 2% above desired setting. This
feature may also over-cool the condition space by up to 3
degrees to achieve the desired humidity level.

(Note: Both dehumidification modes operate in Cooling mode only
with a call for cooling)

[hvacvegas]

Can somebody help me understand this about how the internal humidity control works? I'm not clear by reading the description what the difference between OC and OD is. OD can reduce the temperature by up to 3 degrees to dehumidify but OC cant? Neither mode will start the AC for dehumidification unless there is a call for cooling?

Programmable Dehumidification Optimal Comfort
Mode (OC) or Optimal Dehumidification (Od) – This
item can be selected to OC (Optimal Comfort mode), Od
(Optimal Dehumidification), or OFF.

When Optimal Comfort (OC) is enabled, this feature automatically reduces
indoor humidity with a call for Cooling if humidity is 2%
above humidity setpoint. Humidity is set by pressing the
Humidity key when in the appropriate mode, in this case
Cooling, and pressing the up or down keys to set desired
humidity (range 40% to 95%) level followed by pressing
Humidity key again. This dehumidification feature uses
less energy by maintaining temperature and dehumidify-
ing only when a call for Cooling is required.

Optimal De-humidification (Od) when enabled, this feature automatically
reduces indoor humidity with a call for Cooling if humidity is 2% above setting.
Humidity is set by pressing the HUMIDITY key when in the appropriate mode, in
this case Cooling, and pressing the up or down keys to set
desired humidity level followed by pressing Humidity key
again. This dehumidification feature may use more energy
by making dehumidification a priority initiating a call for
cooling if humidity is 2% above desired setting. This
feature may also over-cool the condition space by up to 3
degrees to achieve the desired humidity level.

(Note: Both dehumidification modes operate in Cooling mode only
with a call for cooling)

OC only slows the blower.
OD slows the blower, and turns the ac on if there is a call for dehumidification.

"operate in cooling mode" means if you have the thermostat set for "heat" then it doesn't work at all.

[Mr Bill]

Twilli told me he accomplished this by swapping his 4 legged hamster, with a 3 legged one in the blower wheel and it worked great for humidity control.

[motoguy128]

I installed 2 of these thermostats along with Evergreen ECM motors. The Evergreen has the advantage of using low voltage signals to control speed rather than the high voltage motor leads so "rigging" up a relay to slow the blower is simplified.

Overall it seems to work pretty well. I like the thermostat interface better than my VP IAQ and it seem to control temperature just as tight without all the additonal installed settings the VP has.

The furnaces are only 7 years old, so it could be a while to wait for it to fail.

[Mr Bill]

I installed 2 of these thermostats along with Evergreen ECM motors.

Your words in red is why you made this conversion, if a home owner with limited knowledge had to hire a service company to perform this for them, the amount a service company would have to charge, you could almost buy a new VS furnace.
Those Genteq motors are not cheap.

[anthonyac1]

Twilli told me he accomplished this by swapping his 4 legged hamster, with a 3 legged one in the blower wheel and it worked great for humidity control.

hahahaha.

[54regcab]

Got my 1F95-1291 installed, awesome thermostat so far. As an added bonus I love the big blue display, it just looks cool.

[motoguy128]

Got my 1F95-1291 installed, awesome thermostat so far. As an added bonus I love the big blue display, it just looks cool.

It makes a great nightlight too!

I continue to like how it operates better than my VP IAQ. Very quick and easy to get to the installer settings and the systm keeps running while you makes changes.

[54regcab]

It makes a great nightlight too!

I continue to like how it operates better than my VP IAQ. Very quick and easy to get to the installer settings and the systm keeps running while you makes changes.

As an added bonus you can even take it off the wall to do programming. Could be handy in some situations.

[motoguy128]

Very handy. You can find a nice comfy chair and a cup of coffee to do the programming. then just calibrate the themp and humidty readings as needed and you're good to go.

The first unit I was sent had some inconsistent humidity readings so I returned it. the new one is better. Part of it is the location. I still haven't gotten around to addign the remote indoor sensor for my upstairs unit.