Knowledgebase

VisionPro IAQ Setup Guide

Article ID: 353
Last updated: 6 Feb, 2023

Honeywell Thermostat: YTH9421 VisionPro IAQ

Re: Installer Setup

To Enter Installer Setup:

  • From the home screen, press the System key. (Press Done or Cancel key to return to home screen.)
  • Five blank touch keys show on the bottom of the screen between the Done and Cancel keys. Press and hold the two blank keys on either side of the center blank key for approximately five seconds until screen changes.

Setup# Description Values
110 Zone Number
  • 0 = Not Zoned
  • 1 = Master Controller
  • 2-9 = Satellite Stat
120 First 2 digits of Year
  • 20
130 Last 2 digits of Year
140 Calendar Month
  • 01 - 12
150 Day of the Month
  • 01 - 31
160

Schedule Options

  • 0=Non-Prog
  • 4=Programmable
165 Energy Start Schedule
  • 0 = No
  • 1 = Yes
172 System Type
  • 1=Conventional
  • 2=Heat Pump
  • 3=Heat only (no fan)
  • E=Auto Discovery
173 Heat Pump Type
  • 0=Air to Air
  • 1=Geothermal
174 Compressor Stages
  • 0, 1 or 2
  • E = Auto Discovery
176 Conv / Aux Stages
  • 0, 1, 2 or 3
  • E = Auto Discovery
180

Fan Operation

  • 0=Gas
  • 1=Electric
190

Reversing Valve

  • 0=Cooling
  • 1=Heating
200

Backup Heat

  • 0=Electric
  • 1=Gas
210 Fossil Fuel Control
  • 0=Thermostat-controlled
  • 1=External control
220 Compressor 1 CPH
  • 1, 2, 3, 4, 5 or 6
230 Compressor 2 CPH
  • 1, 2, 3, 4, 5 or 6
240

Heat 1 Cycles/Hr

  • 1=Steam
  • 3=90% Furnace
  • 5=80% Furnace
  • 9=Electric
250 Heat 2 Cycles/Hr
  • 1=Steam
  • 3=90% Furnace
  • 5=80% Furnace
  • 9=Electric
260 Aux Heat CPH
  • 1=Steam
  • 3=90% Furnace
  • 5=80% Furnace
  • 9=Electric
270 Em Heat CPH
  • 1=Steam
  • 3=90% Furnace
  • 5=80% Furnace
  • 9=Electric
280 Backlight
  • 0=Automatic
  • 1=Continuous
290

Additional Choices

  • 0=Main Menu
  • 1=All Choices
300

Changeover Type

  • 0=Manual
  • 1=Automatic
310 Changeover Deadband
  • 2, 3, 4, 5, 6 ,7, 8 or 9
320 Temperature Scale
  • 0=Farenheit
  • 1=Celsius
330 Daylight Savings
  • 0=Off
  • 1=Old Dates
  • 2=New Dates
340 Remote Temperature
  • 0=None
  • 1=Remote Sensor
  • 2=Average
342 Outdoor Temperature
  • 0=None
  • 1=Yes
  • E=Auto Discovery
345 Dual Fuel Control
  • 0=No Droop
  • 1=Droop
  • 2=Droop w/ Aux Lockout
346 Dual Fuel Upstage Time
  • 0 - 16 Hrs
347 Dual fuel Droop Temp
  • 2 - 5 deg
350 Compressor Lockout
  • 15, 20 ,25, 30, 35, 40 or 45
360 Aux Heat Lockout
  • 40, 45, 50, 55 or 60
365 Discharge Temp Sensor
  • 0=None
  • 1=Remote
  • E=Auto Discover
366 Zoning High Limit
  • 0=Disabled
  • 110 - 170 deg.
367 Zoning Low Limit
  • 0=Disabled
  • 35 - 50 deg.
368 Zone Stage Hi Limit
  • 0=Disabled
  • 80 - 130 deg.
369 Zone Stage Lo Limit
  • 0=Disabled
  • 50 - 60 deg.
370 Humidity Sensor
  • 0=Disabled
  • 1=Internal
  • 2=Remote
  • E=Auto Discover
372 Humidification
  • 0=Off
  • 1=Humidify (no frost control)
  • 3=Humidify (frost control)
  • 8=Desert Humidity (no frost control)
  • 9=Desert Humidity (frost control)
  • E=Auto Discover
374 Humidify Fan Action
  • 0=Humidify w/ Fan or Heat
  • 1=Humidify Forces Fan On
  • 2=Humidify Only w/ Heat
  • 3=Independent Humidifier
379 Dehumidify Control
  • 0=None
  • 1=Dehumidify w/ A/C
  • 3=Independent Dehumidifier
382 Dehumidify Modes
  • 0=Dehum in Cool or Auto
  • 2=Dehum in All Modes
  • 3=Dehum in Cool, Off or Auto
383 Dehum Over-Cool Limit
  • 1-3 Deg.
384 Dehumidify Fan Action
  • 0=Energizes Fan
  • 1=No Action
386 Dehumidify Lockout
  • 0=Disabled
  • 1-Enabled
390 Dehumidify Away Mode
  • 0=Disabled
  • 1=Enabled
391 Away Mode Fan Action
  • 0=Auto
  • 1=On
  • 2=Circulate
392 Away Mode Low Limit
  • 70-80 deg.
393 Away Mode Temp
  • 70-99 deg.
394 Away Mode Humidity
  • 40-70%
400 Ventilation Control
  • 0=None
  • 1=On at All Times
  • 2=On Except Sleep
  • 3=#1 w/ Lockouts
  • 4=#2 w/ Lockouts
401 # of Bedrooms
  • 1-6
402 House Sq. Ft.
  • 10-50 (X 100)
403 Ventilation CFM
  • 30-195
404 Max Vent Percentage
  • 30-60
  • 100=Unlimited
405 Ventilation Fan
  • 0=On
  • 2=No Fan
406 Ventilation in Humidity
  • 0=Off
  • 1=On
430 Ventilation Lockout
  • 0=Disabled
  • 1=Lockout High Temp
  • 2=Lockout Low Temp
  • 3=Lockout High & Low
431 Vent Hi Temp Lockout
  • 90-110 deg.
432 Vent Low Temp Lockout
  • 0 to -20 deg.
450 DATS Inhibit
  • 0-65 deg.
500 Filter Reminder
  • 0=Off
  • 1=10 Days
  • 2=30 Days
  • 3=60 Days
  • 4=90 Days
  • 5=120 Days
  • 6=365 Days
502 Filter Runtime
  • 0=Counts Heat & Cool
  • 1=Counts Cool Only
510

Humidifier Reminder

  • 0=Off
  • 1=90 Days
  • 2=180 Days
  • 3=365 Days
520

UV Reminder

  • 0=Off, 1=365 Days
530 Intelligent Recovery
  • 0=Off, 1=On
540

Programmable Periods

  • 2 or 4
550 # of Weekend Periods
  • 2 or 4
560 # of Weekday Periods
  • 2 or 4
580 Compressor Delay
  • 0, 2, 3, 4 or 5
600 Highest Heat Temp
  • 40 to 89     82
610 Lowest Cool Temp
  • 51 to 99     65
640 Clock Format
  • 12=12 Hour, 24=24 Hour
650 Extend Fan Time (Heat)
  • 0 or 90
660

Extend Fan Time (Cool)

  • 0 or 90
670 Keypad Lockout
  • 0=Unlocked
  • 1=Partial Lock
  • 2=Full Lock
680 Temperature Control (Heat)
  • 1=Less aggressive
  • 2=Standard
  • 3=More aggresive
690 Temperature Control (Cool)
  • 1=Less aggressive
  • 2=Standard
  • 3=More aggresive
700 Temperature Display Offset
  • -3, -2, -1, 0, 1, 2 , 3
701 Humidity Display Offset
  • -12 to 12%
710 Thermostat Reset
  • 0=No reset
  • 1=Reset all options
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Article ID: 353
Last updated: 6 Feb, 2023
Revision: 4
Access: Public
Views: 1022
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