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Most Recent Honeywell YTH9421 Questions
How To Replace Th9421c1004 With A Ythx9421r5051 (honeywell Thermostat )?
(Posted by Xmark124 10 years ago)
Do I Need A New Thermostat?
Last night part of the touch screen of my Honeywell YTH9421c1004 got zapped with static electricity ...
Last night part of the touch screen of my Honeywell YTH9421c1004 got zapped with static electricity ...
(Posted by edandbin 11 years ago)
Popular Honeywell YTH9421 Manual Pages
Owner's Manual - Page 3
...: EQUIPMENT DAMAGE HAZARD. See page 2 to go ! Table of contents
VisionPRO® IAQ
About your new thermostat Programming at a glance 2 Quick reference to controls 3 Quick reference to status display......... 4
Programming & Operation Clock setting 5 Fan setting 6 System setting 7 Energy Star settings 8 Using program schedules 9 Program schedule overrides 10 Vacation hold 12 Special...
Owner's Manual - Page 5
... 9)
MON TUE WED THU
FRI
SAT SUN
OK TO PICK MULTIPLE DAYS
70 FAN Inside
AUTO
70 Set To
SYSTEM
HEAT
6:01 AM
Following Schedule
SCHED HOLD CLOCK SCREEN MORE
VisionPRO® IAQ
Press to adjust temperature settings (see pages 9-11) Press for more options
Press to override program schedule (see pages 10-11...
Owner's Manual - Page 7
...changing the time). Note: The real-time clock should never require adjustment since it automatically updates for daylight savings time, and stores all date/time information. Note: To change the ...setting
70 FAN Inside
AUTO
70 Set To
Press CLOCK
6:01 AM
SCHED HOWLEDD CLOCK SCREEN MORE
70 70 FAN Inside
Set To
AUTO
Adjust time, then press DONE
6:02 AM
DONE
CANCEL
VisionPRO® IAQ
To set...
Owner's Manual - Page 9
...
70 FAN Inside
AUTO
SYSTEM HEAT
6:01 AM
70 Set To
Following Schedule
SCHED HOLD CLOCK SCREEN MORE
Press SYSTEM
VisionPRO® IAQ
Press the SYSTEM button to select, then press DONE:
• Heat: Thermostat controls only the heating system.
• Cool: Thermostat controls only the cooling system.
• Off: Heating and cooling systems are...
Owner's Manual - Page 11
... program period to start
Note: You can press CANCEL PERIOD to set Heat and Cool temperature for selected day(s).
4. 70 FAN Inside
AUTO
70 Set To
To
adjusWEDt
program Following Schedule
schedules
VisionPRO® IAQ
67:000 FAN Inside
AM
PrAeUTsOs SCHED
70 Set To
SCHED HOLD CLOCK SCREFESNoclhloewdMuiOnleRgE
6:00 Press EDIT
AM
DONE EDIT...
Owner's Manual - Page 13
... temperature. Program schedule override (permanent)
VisionPRO® IAQ
Press HOLD Adjust temperature
WED
70 FAN Inside
AUTO SYSTEM
73 Set To Heat On
HEAT
8:00 AM Permanent Hold SCHED HOLD CLOCK SCREEN MORE
CANCEL
Press HOLD to resume program schedule
11
69-1815EFS-06 Whatever temperature you manually change it or press CANCEL (or...
Owner's Manual - Page 15
... selects heating or cooling depending on screen. Special features
VisionPRO® IAQ
Auto Changeover: When set . Adaptive Intelligent Recovery: This feature allows the thermostat to "learn" how long the furnace and air conditioner take to reactivate the alert timer.
After replacement, press RESET to reach programmed temperature settings, so the temperature is displayed on the indoor...
Owner's Manual - Page 17
...can clean the screen without changing any liquid directly on the thermostat. Avoid abrasive cleansers.
Note: Do not spray any settings. The screen will remain locked for cleaning. After 30 seconds...Inside
SCREEN LOCKED Set To
Press SCREEN
Following Schedule
6:00PM
SCHED HOLD CLOCK SCREEN MORE
Screen lock timer (30 seconds)
30 OK TO CLEAN SCREEN
VisionPRO® IAQ
Press SCREEN to...
Owner's Manual - Page 19
...setting. Once frost no longer appears, the thermostat will not be displayed.
17
69-1815EFS-06 Press DONE to save & exit
5
FROST DEHUMIDIFIER
55
CANCEL
Press MORE until the humidifier screen is displayed, then press s or t to set... windows and without saving changes. Humidification control
VisionPRO® IAQ
Set Frost Control & humidity level
32 Inside
DONE
Press to save and...
Owner's Manual - Page 21
...VisionPRO® IAQ
You can set the timer to ventilate from 20 to 180 minutes, in 20-minute increments. Ventilation can still be requested by the installer, the thermostat will turn off /on the automatic ventilation only. You can ventilate your home as needed. Ventilation control
Press to set...If programmed for auto-ventilation by using the timer when set to set the ventilation timer.
Owner's Manual - Page 23
...
Press s/t to change the current date:
Options: 01 - 31
21
VisionPRO® IAQ 69-1815EFS-06 Advanced functions
Year setting (first two digits)
Function 0120
Press s/t to change the first two digits of the year:
Options: 20 = Year 20xx 21 = Year 21xx
Year setting (second two digits)
Function 0130
Press s/t to change the last...
Owner's Manual - Page 25
... that use
the new 2007 DST calendar)
23
69-1815EFS-06 Advanced functions
VisionPRO® IAQ
Temperature format (°F/°C)
Function 0320
Press s/t to set the temperature display format:
Options: 0 Fahrenheit 1 Celsius
Daylight savings time on/off
Function 0330
The thermostat is pre-programmed to automatically adjust to daylight savings time (2007 and beyond...
Owner's Manual - Page 27
Advanced functions
VisionPRO® IAQ
Humidifier pad change reminder
Function 0510
This feature displays an alert to remind you to change the ultraviolet lamp. Press s/t to set the desired interval:
Options:
0 Off (no ...(see page 13):
Options: 0 Off 1 On
25
69-1815EFS-06 Press s/t to set the desired interval:
Options:
0 Off (no reminder to turn this feature on humidifier
UV ...
Owner's Manual - Page 29
....
Your equipment may need service or repair.
27
69-1815EFS-06 ...set to acceptable ranges: • Heat: 40° to 90°F (4.5° to 32°C) • Cool: 50° to 99°F (10° to make sure the thermostat is closed securely. Most problems can be corrected quickly and easily.
"Err" appears on page 22 for backlight options. In case of difficulty
VisionPRO® IAQ...
Owner's Manual - Page 31
...warranty gives you specific legal rights, and you may have any time during the warranty period the product is defective,
(i) return it is shown by Honeywell that the ..., Honeywell shall repair or replace it ; 5-year limited warranty
VisionPRO® IAQ
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, ...
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