[marsh350]

Hello all,

I have a new rheem furnace but my whole house humidifier is not working. when the installers of the furnace hooked everything up they plugged one wire from the manual humidity controller in the the "C" on the furnace board and the other into the "Y1" which is bridged with the "Y2" where the yellow from my thermostat is connected.

I don't think this is right because the solenoid on the humidifier is not receiving any power. According to the manual I should be hooking it up like this:

https://imgur.com/a/tESK2

but I am not really following that diagram, can somebody help me figure out what terminals I am supposed to plug my wires into from my 500m controller? I am pretty sure the "C" is correct just not sure where the other one goes.

Thanks

 

[user_12345a]

It should be connected to the humidifier terminals or connected to W1. (if you have a communicating stat, only humidifier terminals)

It's an elementary mistake, y is for cooling.

 

[marsh350]

It should be connected to the humidifier terminals or connected to W1. (if you have a communicating stat, only humidifier terminals)

It's an elementary mistake, y is for cooling.

Ok, my Thermostat is a Honeywell Wifi Thermostat (TH9320WF5003) and I don't believe it has an ability to control humidity, so I will be using the simple manual humidity controller provided with the humidifier. if that is the case should I change the wiring to the attached image?

 

[user_12345a]

What's the model number of the furnace?

With it being new - where's the installer/contractor in this?

You shouldn't have to alter wiring.

The wiring looks messed up.


With a single stage thermostat, wire should be on W1, not W2.

Really 2-stage stat should be used (yours may be but not wired/setup right) and wire run between W2 on board and stat.


Do you notice it upstaging after a few minutes? or just running full blast right away?

The wire to the humidifier should be on W1 and C (or to humidifier terminal) but it won't work with the stat wired to W2, that would have to be altered.

You have two wires on Y, you said one is for the humidifier.

Central a/c gets wired from Y and C - are you sure you're not mistaking the low voltage a/c wiring for humidifier's?

 

[marsh350]

What's the model number of the furnace?

With it being new - where's the installer/contractor in this?

You shouldn't have to alter wiring.

The wiring looks messed up.


With a single stage thermostat, wire should be on W1, not W2.

Really 2-stage stat should be used (yours may be but not wired/setup right) and wire run between W2 on board and stat.


Do you notice it upstaging after a few minutes? or just running full blast right away?

The wire to the humidifier should be on W1 and C (or to humidifier terminal) but it won't work with the stat wired to W2, that would have to be altered.

You have two wires on Y, you said one is for the humidifier.

Central a/c gets wired from Y and C - are you sure you're not mistaking the low voltage a/c wiring for humidifier's?

Well, it is a newish furnace, installed in November 2018, haven't tried to use the humidifier since the new furnace was installed so never realized it wasn't wired correctly. Everything else about the furnace seems to work fine the Model is a Rheem R96VA0702317MSA.

If you look at the picture I attached in my second post you will see there is a brown wire and white wire coming into the furnace that then splits into the different colors. The white wire is without a doubt the one on the Humidifer circuit and is attached at "C" and "Y2"

The rest of the wiring might look off because the connections between the thermostat and the AC wiring are actually made in wire nuts outside of my furnace, see attached image.

also just to add the angle of my picture in my second post may be misleading the connections are

0 - E1
0 - E2
1 - R
2 - C
0 - Hum Stat
1 - W1
0 - W2
1 - G
1 - Y1 (bridged to Y2)
1 - Y2(bridged to Y1)
0 - B

 

[user_12345a]

The red wire going to C -> where's that going?

Are you saying the wire from C goes to a bundle both both a/c and humidifier are connected to?

In that case, just move the humidifier wire from Y to W1.

OR wire it to the humidifier terminals on the board-> stepdown transformer may be required.

You should know, you paid for a nice 2-stage thermostat yet they wired it up as if it was single. That should be corrected so you get the true benefit of the 2-stage furnace -> extended cycles on low fire in very cold weather, not timing out after like 10 minutes and locking on to high fire to quickly satisfy.

Needs an extra conductor to the thermostat though.

There's a very high chance they left the a/c blower airflow set to maximum and if you have a 1.5 or 2 ton a/c, it needs adjustment.

 

[marsh350]

The red wire going to C -> where's that going?

Are you saying the wire from C goes to a bundle both both a/c and humidifier are connected to?

In that case, just move the humidifier wire from Y to W1.

OR wire it to the humidifier terminals on the board-> stepdown transformer may be required.

You should know, you paid for a nice 2-stage thermostat yet they wired it up as if it was single. That should be corrected so you get the true benefit of the 2-stage furnace -> extended cycles on low fire in very cold weather, not timing out after like 10 minutes and locking on to high fire to quickly satisfy.

Needs an extra conductor to the thermostat though.

There's a very high chance they left the a/c blower airflow set to maximum and if you have a 1.5 or 2 ton a/c, it needs adjustment.

To answer your first question, yes the AC has two wires a White that is wire nutted in with the blue from the thermostat (connected to "C" on furnace) and a Red that is wire nutted in with the yellow from the thermostat (connected to "Y2" on furnace)

the humidifier has separate wires a red which is the other one attached at "C" on my furnace and the white which is attached at "Y1" on the furnace that I plan to move to "W1" per your suggestion

Lucky enough I actually have an extra conductor between the thermostat and furnace that is not being used (the color for this wire is brown), so I could properly hook it up if I knew how. I have a 1.5 ton A/C also Rheem installed at the same time. Attached is a picture of my current thermostat set up.

 

[user_12345a]

70k furnace is big to be paired up with a 1.5 ton a/c.

Do check the dip switches - should be set to up to deliver 600 to 700 cfm depending on climate and air duct system. Some parts of the house may not get proper airflow with it running at 600 cfm.

The thermostat needs to be set up as 2-stage, cycles per hour set to 3 and dip switches set to disable auto-staging timer.

install manuals should have all this info.

 

[marsh350]

70k furnace is big to be paired up with a 1.5 ton a/c.

Do check the dip switches - should be set to up to deliver 600 to 700 cfm depending on climate and air duct system. Some parts of the house may not get proper airflow with it running at 600 cfm.

The thermostat needs to be set up as 2-stage, cycles per hour set to 3 and dip switches set to disable auto-staging timer.

install manuals should have all this info.

You are right, it is actually a 2 ton A/C, I found the wiring diagrams in the manual, thanks for the help

 

[user_12345a]

Manual shows cooling factory default is 1050 cfm and this should be brought down to 800-900 for 2 tons. Higher cfms are better for airflow to the second floor/distant rooms but at the expense of dehumidification.

Dip switch settings should be reviewed - pages 89 to 91 in the install manual.

"Cooling Airflow Selection; S1-4 & S1-5"

"Auto Stage; S2-10 & S2-11
There are applications where a single stage thermostat is used with the two stage furnace. With
these applications the furnace will initially operate
in the low heat stage. Based upon a user selected
time, the furnace will automatically stage to high
heat stage mode. Auto staging will take place with
a 24VAC signal on “W1” when autostaging is
turned on. “W2” will be recognized as a call for
stage 2 heat even when autostaging is active. The
following dipswitches are available to accommodate this requirement:
S2-10 S2-11 AutoStage
OFF OFF Normal 2 stage operation
(Autostaging is off)(factory setting)
ON OFF AutoStage, 10 minutes on low,
then to high with call on “W1”
OFF ON AutoStage, 15 minutes on low,
then to high with call on “W1”
ON ON AutoStage, 20 minutes on low,
then to high with call on W1”"