Apply to be a TradeMaster!
Main product image of VisionPro IAQ Thermostat, Module, & Outdoor Sensor, YTH9421C1010
Magnifying glass
Hover image to zoom

VisionPro IAQ Thermostat, Module, & Outdoor Sensor, YTH9421C1010

Brand:
Honeywell
SKU:
YTH9421C1010
Rating:
(5)
Q&A:
(3)
VisionPro IAQ Thermostat, Module, & Outdoor Sensor, YTH9421C1010
Magnifying glass
Hover image to zoom
YTH9421C1010 has been discontinued
Discontinued April 14, 2015
This product was discontinued by the manufacturer.
Suggested Alternative:
Prestige IAQ Kit with RedLINK Technology (Includes White Thermostat, EIM & 2 Duct Sensors), YTHX9421R5085WW
SKU:YTHX9421R5085WW
(21)
Order by 6PM, receive 30 by Monday
VIEW ALTERNATIVE
VIEW ALTERNATIVE

Product Highlights

Product Highlight: Amperage
1 Amps
Product Highlight: Stages
3 Heat/2 Cool, 4 Heat/2 Cool Heat Pump
Product Highlight: Programmability
7 Day, Programmable
Product Highlight: Mount
Horizontal
Product Highlight: Power Method
Communicating
Product Highlight: Temperature Range (F)
40°F - 99°F

Description

The VisionPRO IAQ touchscreen universal programmable thermostat provides electronic control of 24 Vac heating and cooling systems in addition to humidification dehumidification and ventilation all with just 3 wires to the thermostat.
  • Description: VisionPRO½ IAQ Total Home Comfort System with Temperature, Humidification, Dehumidification and Ventilation Control
  • Application: Heat/Cool or Heat Pump with Auxiliary Heat
  • Programmability: 7 Day Multiple Day Programming or Non-Programmable
  • Changeover: Auto/Manual Selectable
  • Color: Premier White½
  • Switch Positions (System): HEAT-OFF-COOL-AUTO-EM.HEAT
  • Switch Positions (Fan): AUTO-ON-CIRC
  • Power Method: Communicating
  • Terminal Designations: 1, 2, 3, C, R, Rc, Rh, R, W1-O/B, W2-Aux, W3-Aux2, Y, Y2, G, L, Out1, Out2, In1, In2, Dats1, Dats2, Hum1, Hum2, Dhm1, Dhm2, Vnt1, Vnt2
  • Dimensions (in.): 4 9/16 in. high x 6 in. wide x 1 1/4 in. deep
  • Dimensions (mm): 116 mm high x 152 mm wide x 32 mm deep
  • Setting Temperature Range (F): Heat: 40 F to 90 F; Cool: 50 F to 99 F
  • Setting Temperature Range (C): Heat: 4.5 C to 32 C; Cool: 10 C to 37 C
  • Differential Temperature (F): ª 1 F
  • Differential Temperature (C): ª0.5 C
  • Stages: Up to 4 Heat/2 Cool Heat Pump
  • Stages: Up to 3 Heat/2 Cool Conventional
  • Outdoor Sensor: Outdoor Sensor Included
  • Discharge Sensor: Yes, optional
  • Remote Sensor: Yes, optional
  • Sensor Element: Thermistor
  • Heat Current: 1.0 A running
  • Cool Current: 1.0 A running
  • Fan Current: 0.6A running
  • Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
  • Includes: TH9421C1004 Thermostat, THM5421C1008 Equipment Interface Module and C7089U1006 Outdoor Temperature Sensor
  • Comments: Includes Humidification Control with or without Frost Protection, Dehumidification using Whole House Dehumidifier or Air Conditioning with High or Low speed fan, Advanced Patented Ventilation Control and Advanced Dual Fuel Heat Pump Control.
  • Humidification Setting Range: 10 to 60% RH.
  • Dehumidification Setting Range: 40 to 80% RH.
  • Voltage: 20 to 30 Vac

Specs

Amperage:

1

Application:

Heat Pump

Multi-Stage (Heat/Cool)

Stages:

3 Heat/2 Cool

4 Heat/2 Cool Heat Pump

Programmability:

7 Day

Programmable

User Interface:

Touchscreen

Mount:

Horizontal

Options:

Large Display

Auto Changeover

Fan Control

Works with Sensor

Changeover:

Manual

Auto

Power Method:

Communicating

Temperature Range (F):

40°F - 99°F

Voltage:

Low voltage

Wattage:

12 to 30

Wiring:

L

R

1

Y2

Vnt2

Rc

Y

Vnt1

G

Dhm1

Rh

3

C

Dhm2

2

Color:

Premier White

Height:

4-9/16"

Depth (Inches):

1-1/4"

Width (Inches):

6"

Contact

Help Face
CALL US
Question? Call or text 888-757-4774
+
Help Face

Questions?

Speak with a real person who will go out of the way to help!
Call or text 888-757-4774
MondayThursday
8am7:45pm
Friday
9am7:45pm
SaturdaySunday
9am5:45pm


Product Reviews

4.8 out of 5 reviews
100% would recommend this product
4.8
out of 5 Reviews
100% would recommend this product
WRITE A REVIEW
5 star
80%
4 star
20%
3 star
0%
2 star
0%
1 star
0%
WRITE A REVIEW
Showing 1-5 of 5 reviews

Bought VisionPro IAQ to Replace PC8900

I had a 13 year old Honeywell PC8900 system that was failing. I discovered the VisionPro IAQ and bought it as a replacement. It was easy to swap with the PC8900 and works great. My old system had an outdoor temperature sensor with model #C7089. This system came with an outdoor sensor with the same model #C7089 so I thought cool, I have a spare. Once I fired up the new system, it became clear that the old C7089 and the new one have different characteristics even though they share the same model number. My outdoor temperature displayed as 127 degrees! That's a bit warm for a mid November day in Michigan. As soon as I changed to the new C7089, I got a reading of 46 degrees, which is exactly what the outside temperature was.
ctbcubed
Michigan
14 years ago
Was this review helpful to you?

So Far So Good

I bought this with a Honeywell steam humidifier and an outside temperature sensor. Installation is simple enough - just choose any three of your thermostat wires for the wall unit to talk to the remote module you mount near your furnace. All the key connections run from the remote unit to your furnace, heatpump, humidifier, whatever. It pays to understand what the wire colors mean on your current system. My main complaint is that the installation instructions are confusing. They clearly prefer that an HVAC tecnician install this. Oddly, the instructions that came with my TrueSteam humidifier were far clearer (though there are ~15 configurations to choose from). Download the installation instructions (on this site) from the humidifier if you have trouble. The wire on the outside temperature sensor is only ~5 or 6 feet long. You'll need extra thermostat wire to make up for that.
Pablo
Maryland, USA
14 years ago
Verified Buyer Icon
Verified Buyer
Was this review helpful to you?

Quick install, works well

Installation was quick using existing wire. Works well and is easy to use.
DynamoBen
WI
15 years ago
Verified Buyer Icon
Verified Buyer
Was this review helpful to you?

Works great, easy install

After much research into programmable thermostats for my heat pump system, I selected this one and have not been disappointed. I was looking for a reliable thermostat with outdoor temperature sensor (for compressor lockout and frost protection) and humidification control. This seemed to be the best one available. I installed this about a month ago without any problems. Adding a humidifier a week ago was also easy. The only slight annoyance so far is the fact that the screen is not touch sensitive everywhere, only in certain regions (although there are a lot of them). This means that when the room is dark, you have to make sure you touch the screen in one of those regions to get the back light to come on. Not a big deal, but it caught me by surprise. One nice thing, however, is that the screen dimly glows all the time. You will never see it, however, until the room is dark. It is the perfect level to find it in the dark. I would recommend downloading the more complete "Product Data" sheet from Honeywell. It contains further explanations of the setup parameters and how they are used. It also details the output sequencing. It can be found at the Honeywell website: [@]
Merchant response
15 years ago
The Product Data sheet mentioned in this review is now available on the "Manuals" tab on this page.
MAZ
Allentown, PA
15 years ago
Verified Buyer Icon
Verified Buyer
Was this review helpful to you?

Best thermostat on the market bar none!!

This stat does it all. And it simplifies wiring. Only 3 wires required between stat and Equipment interface module. I recomend this to everyone.
BKC
Pittsburgh, PA
16 years ago
Verified Buyer Icon
Verified Buyer
Was this review helpful to you?

Product Q&A

3 Questions
3 Questions
ASK A QUESTION

Q: I'd like to use this to control a Honeywell dehumidifier installed in a crawlspace. Will I be able to monitor the humidity level in the crawlspace? Thank you

Asked by Royalacresrod 13 years ago

Add your answer

* Required Field
-

Only if the thermostat is installed within the crawlspace.

Was this review helpful to you?
-

Yes, if the thermostat is placed in the crawlspace. However this seems to be overkill for a crawlspace and a simple humidistat on the dehumidifier would seem more cost effective.

Was this review helpful to you?

Q: Can this unit control my new Honeywell Whole House dehumidifier AND central AC?

Asked by Brad 14 years ago

Add your answer

* Required Field
Verified Author and ReplyVerified Reply- Another PexSupply Customer

It did for me, I have two of them. And the outdoor sensor is optional not necessary, I purchased the one without the outdoor sensor.

Was this review helpful to you?
-

YES

Was this review helpful to you?
- Another PexSupply Customer

The wire panel has 2 contacts for the dehumidifier, that is in addition to the AC, humidifier, fan, etc. So it should be able to. It's one of the reasons I bought this unit, but it's still on my todo list.   Good luck. Sergiu

Was this review helpful to you?
- Another PexSupply Customer

It should be able to control both. I'm using mine with a Honeywell TruSteam, central AC & Heat.

Was this review helpful to you?
- Another PexSupply Customer

Yes, this will work with both an AC Unit and Dehumidifier. See the installation manual, pages 15 and 21: http://www.forwardthinking.honeywell.com/related_links/thermostats/prestige/69-2490.pdf

Was this review helpful to you?
- Another PexSupply Customer

Yes this unit can control your dehumidifier and your AC. I currently have mine working with my heat pump (heat and AC) as well as a dehumidifier. Make sure to understand how to connect the IAQ and how to set it up before committing to buying it.

Was this review helpful to you?
- Another PexSupply Customer

Hi, I don't have a  Whole House dehumidifier.  The unit controls the central AC and a fresh air intake.  Thanks, Igor

Was this review helpful to you?
- Another PexSupply Customer

Yes, there are contacts for both.

Was this review helpful to you?
- Another PexSupply Customer

I had a new furnace and central air installed last year. I added a Honeywell whole house dehumidifier and installed this unit to control it all. The installation of the unit was straightforward, but as I recall I had to do some hunting to find the manual to program the unit. I do not believe that it was included along with the unit. I believe I found it online at thesite. Of c, it depends on how much experience one has with understanding and installing something like this. It might be beyond the ability of the average homeowner.

Was this review helpful to you?

Q: Does the YTH9421C1010 t-stat come w/ the outdoor sensor or is it a separate item?

Asked by 73shark 15 years ago

Add your answer

* Required Field
Verified Author and ReplyVerified Reply- PexSupply Staff

This item includes the C7089U1006 Outdoor Temperature Sensor.

Was this review helpful to you?