Part Numbers and Accessories
VisionPRO IAQ Total Home Comfort System
Part Number YTH9421C1010 YTH9421C1002 TH9421C1004 THM5421C1008 Description Thermostat, Equipment Interface Module and outdoor temperature sensor Thermostat and Equipment Interface Module Thermostat only Equipment Interface Module only

VisionPRO IAQ

Total Home Comfort System
VisionPRO IAQ Accessories
Part Number C7089U1006 C7189U1005 C7735A1000 C7835A1009 Description Outdoor temperature sensor Indoor temperature sensor 2-wire Discharge Air Temperature sensor 3-wire Discharge Air Temperature sensor

System Enhancements

Part Number Description 4-channel Telephone Access Module 12-GPD TrueSTEAM 9-GPD TrueSTEAM 6-GPD TrueSTEAM 150-pint TrueDRY dehumidifier 90-pint TrueDRY dehumidifier 65-pint TrueDRY dehumidifier Energy recovery ventilator Heat recovery ventilator Fresh air damper UV air treatment system with SmartLamp technology TrueUV Ultraviolet Treatment System Whole-house electronic air cleaner
W8735D1017 HM512 HM509 HM506 DH150 DR90 DR65 ER150/200 HR150/200 EARD6 UV100E UV100R F300
is everything that you love about VisionPRO and so much more. Use it for every job where you need to:
Upgrade to Multi-Stage Equipment Save time, money and hassle. Theres no need to pull additional wires through the wall to connect the thermostat in the living space. Three wires are all you need, and everything else wires through an Equipment Interface Module at the equipment. Add Air Quality Enhancements Without Wall Clutter VisionPRO IAQ gives you all-in-one control for temperature, humidification, dehumidification and ventilation systems eliminating the need for multiple controls in the living space. Everything can be managed from a single, effortless, touchscreen control. Eliminate the Need for a Fossil Fuel Kit VisionPRO IAQ has a built-in fossil fuel kit. It practically pays for itself versus buying a kit. Display Outdoor Temperature Use our outdoor temperature sensor to display outdoor temperature on the thermostat. Sensor included with YTH9421C1010 model. Reduce Inventory VisionPRO IAQ is universal and works with almost every brand of heating/cooling equipment up to 3 Heat/2 Cool conventional and 4 Heat/2 Cool heat pump with two stages of auxiliary heat. Quiet Operation All relays are housed in the Equipment Interface Module at the equipment, eliminating the clicking noise commonly heard at thermostats in the living space. Use and sell VisionPRO IAQ with confidence. VisionPRO IAQ is not only simple to install, simple to upgrade and simple for homeowners to use its simply the best value on the market today.
Learn More Call toll-free 1-800-328-5111, e-mail info@honeywell.com or visit www.forwardthinking.honeywell.com. Automation and Control Solutions Honeywell 1985 Douglas Drive North Golden Valley, MN 55422-3992 www.honeywell.com
50-1012 PM March Honeywell International Inc.
Not your typical VisionPRO. Only three wires and so much more.

THERMOSTATS

ZONING

AIR CLEANERS

HUMIDIFIERS

DEHUMIDIFIERS

ULTRAVIOLET SYSTEMS

VENTILATION

WATER SOLUTIONS
Everything That You Love About VisionPRO Familiar touchscreen, menu-driven programming, installer setup and checkout, precise comfort control (+/- 1 F), and a 5-Year Warranty.
Sell Multi-Stage Equipment With Confidence No need to run new wires. Only three wires required at the control.

NOT your typical

Eliminate Wall Clutter Make More Money Use VisionPRO IAQ as a way to sell more Indoor Air Quality solutions. Customers can add system enhancements up front or choose to upgrade later. Either way, the control is wired and ready to go. Represent the quality of your work with a single control on the wall.

VisionPRO

Smart Change/Check Reminders Let customers know when to service or replace batteries, filters, UV bulbs (based on actual usage) and humidifier pads.
While they may look the same, VisionPRO IAQ takes our popular VisionPRO thermostats where they havent gone before. The VisionPRO IAQ Total Home Comfort System allows you to manage temperature, humidification, dehumidification, ventilation and change/check reminders all from a single control and all with only three wires.
Three-Wire Communication Only three wires from the thermostat to the Equipment Interface Module make even retrofit installations quick and easy. Solid-State Relays Eliminate relay clicking at the thermostat in the living space. Relays reliably switch the equipment on and off through the EIM at the equipment. Controls Humidification Terminals allow you to wire and control bypass, flow-through or steam humidifiers.
TrueSTEAM Humidification System

How Does It Work?

The two-piece design of the VisionPRO IAQ includes both a control (the thermostat) and an Equipment Interface Module (EIM). Only three wires are required for installing the thermostat in the living space, and everything else is wired through the EIM positioned at the equipment. Not only does the three-wire installation save you time and labor hours, but it also means that youll reduce your risk when bidding the job. When a job calls for multi-stage equipment or a heat pump, you wont have to pull any additional wires.
Universal Application Works with almost every brand of heating/cooling equipment up to 3 Heat/2 Cool conventional and 4 Heat/2 Cool heat pump with two stages of auxiliary heat. Theres nothing else like it on the market.

Three are all you need.

TrueDRY DR90 Whole-House Dehumidifier
Controls Dehumidification Terminals allow you to wire and control a whole-house dehumidifier, or can be used to configure air conditioning to dehumidify at low fan speeds.
Controls Ventilation Terminals allow you to wire and control HRVs, ERVs or fresh-air dampers to provide ventilation and meet ASHRAE 62.2 ventilation codes.

Whole-House Ventilation

Indoor/Outdoor Sensing Capability Allows for simultaneous remote indoor and outdoor temperature sensing. Outdoor sensor comes included in the box (YTH9421C1010) to display temperature on the thermostat and for enhanced control options. Optional indoor sensor can be used for temperature averaging or remote sensing.

VisionPRO IAQ Total Home Comfort System

PRODUCT DATA

FEATURES
Large, clear display with backlight shows the current and set temperature and timeeven in the dark. Touchscreen interaction Real-time clock keeps time during power failures and automatically updates to daylight savings. Change/check reminders let you know when to service or replace filters. Various Hold options allow you to override the program schedule, as desired. Controls humidification to increase homeowner comfort while protecting woodwork and furnishings. Controls dehumidification using air conditioner with high or low speed fan or a whole house dehumidifier. Controls ventilation with other HRV, ERV, or Freshair damper. Vent on demand and automatically using patented advanced ventilation control.

APPLICATION

The VisionPRO IAQ Total Home Comfort System features an effortless, 7-Day programmable touchscreen thermostat that provides control of temperature, humidification, dehumidification, and ventilation.
Advanced heat pump control featuring balance point plus temperature droop control to increase homeowner comfort.

Contents

Application/Features... Specifications/Ordering Information.. Installation.. Wiring... Power the Thermostat.. Installer Setup... Operation... Programming... Troubleshooting... 36

68-0287-04

VISIONPRO IAQ TOTAL HOME COMFORT SYSTEM

SPECIFICATIONS

Thermostat Description: Feature Powering method Description Common wire only Finish: VisionPRO IAQ Thermostats: Premier White color. THM5421C1008: Premier White color. C7189U1005 Wall Mount Remote Indoor Sensor: Premier White color. Clock Accuracy: +/- 1 minute per year. Resistance Characteristics of Remote Sensors: C7089U1006 Outdoor Sensor: Negative temperature coefficient (NTC) means that resistance decreases as the temperature increases. See Table 12 in the Operation section for sensor resistance characteristics. C7189U1005 Remote Indoor Sensor: Negative temperature coefficient (NTC), means that resistance decreases as the temperature increases. See Table 13 in the Operation section for sensor resistance characteristics. Cool Indication: VisionPRO IAQ Comfort Systems show Cool On on the thermostat screen when Cool is activated. Heat Indication: VisionPRO IAQ Comfort Systems show Heat On on the thermostat screen when Heat is activated. Auxiliary Heat Indication: VisionPRO IAQ Comfort Systems show Aux. Heat On on the thermostat screen when Auxiliary Heat is activated. Calibration: C7089U1006, C7189U1005 and VisionPRO IAQ Comfort Systems are factory-calibrated and require no field calibration. Interstage Differential: VisionPRO IAQ Comfort Systems operate with droopless control. Once the thermostat senses that 1st stage is running at 90% capacity, the thermostat energizes 2nd stage. Mounting Means: VisionPRO IAQ Comfort System: Thermostat mounts directly on the wall in the living space using mounting screws and anchors provided. Fits a vertical or horizontal 2 x 4 in. junction box. THM5421C1008 Equipment Interface Module (EIM) mounts on HVAC equipment or on a wall in the equipment room. C7089U1006 Outdoor Sensor: Mounts outside of living space with mounting clip and screws provided. C7189U1005 Remote Indoor Sensor: Mounts directly on the wall using mounting screws and anchors provided. Cover Plate: 32003796-001 Cover Plate is used to cover marks left on the wall by the old thermostat. Dimensions: VisionPRO IAQ Comfort System: see Fig. 1. THM5421C1008: see Fig. 2 C7089U1006 Outdoor Sensor Mounting Clip: see Fig. 3. 32003796-001 Cover Plate: see Fig. 4. C7189U1005 Remote Indoor Sensor: see Fig. 5.

WIRING

All wiring must comply with local electrical codes and ordinances. See Fig. 1020. 1. 2. Select set of terminal identifications (Table 1) that corresponds with system type. Loosen the screws for the appropriate system type selected; see Table 1. See Table 2 for terminal designation descriptions. Insert wires in the terminal block under the loosened screw. See Fig. 9. Securely tighten each screw. Push excess wire back into the hole. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. See Fig. 1020 for typical wiring hookups.

3. 4. 5. 6.

Communication LED
The EIM has an LED (see Fig. 8) that communicates the EIM status as follows. LED blinks rapidly: Normal information transfer. LED blinks once: Incoming message to EIM. LED blinks continuously: Wiring problem. Check wiring to terminals 1, 2, 3. LED always off: Wiring problem. Check wiring to terminals 1, 2, 3. LED always on: EIM may need replacement.
Table 1. Selecting Terminal Identifications for System Type. System Type Wallplate Terminal Identifications Wiring Diagram Reference 10, 13
Standard Heat/Cool Conventional Standard Multistage Conventional up to 3 Heat/2 Cool Heat Pump with Auxiliary Heat Heat Pump

NOTES: 1.

When used in a single-transformer system, leave the metal jumper wires in place between R and Rc, and Rc and Rh. If used on a two-transformer system, remove metal jumper wire between Rc and Rh. If thermostat is configured for a heat pump system in the Installer Setup, configure changeover valve for cool (O-factory setting) or heat (B).
For wiring to a W8835 Zone panel please refer to the product data sheet included with the panel.
Fig. 9. Inserting wires in terminal block. IMPORTANT Use 18-gauge thermostat wire. Table 2. Terminal Designation Descriptions. THM5421C1008 Terminal Designations 3 C R RC RH HUM1/HUM2 DHM1/DHM2 VNT1/VNT2 W1/O/B W2/AUX
3 C R RC COMMUNICATION LED COMMUNICATION TERMINALS 24 VAC CONV. HP W1 O/B W2 AUX W3 AUX2 Y G Y G Y2 Y2
Function Terminal 1data to/from thermostat Terminal 2power from thermostat (24Vac) Terminal 3common from thermostat (24Vac) 24 Vac Transformer Common 24 Vac Transformer 24 Vac Cooling Transformer 24 Vac Heating Transformer Humidification Connection (normally open) Dehumidification Connection (normally open or closed based on installer setup) Ventilation connection (normally open) Stage 1 Heating Relay (Conventional) Change-over Relay (Heat Pump) Stage 2 Heating Relay (Conventional) Auxiliary Heat (fossil fuel or electric) (Heat Pump) Stage 3 Heating Relay (Conventional) Auxiliary Heat (fossil fuel or electric) (Heat Pump) Stage 1 Compressor Relay Stage 2 Compressor Relay Fan Relay Heat Pump Equipment Monitor Outdoor Temperature Sensor Remote Indoor Temperature Sensor Discharge Air Temperature Sensor

If thermostat is set to Auto Changeover System mode, press the More key until the outside temperature is shown on the screen.
Fig. 25. Typical location for C7189U1005 Indoor Sensor.
Wire C7189U1005 Indoor Sensor
Electrical Interference (Noise) Hazard. Can cause erratic system operation. Keep wiring at least one foot away from large inductive loads such as motors, line starters, lighting ballasts and large power distribution panels.

SCHED DONE

HOLD WAKE

CLOCK LEAVE

SCREEN RETURN

CANCEL

M22448
IMPORTANT Erratic temperature readings from a sensor can occur as a result of any of the wiring practices described below. Avoid these practices to assure correct operation. Be sure wires have a cable separate from the thermostat cable. Do not route temperature sensor wiring with building power wiring, next to control contactors or near light dimming circuits, electric motors or welding equipment. Avoid poor wiring connections. Avoid intermittent or missing building earth ground.
Locate and Mount C7189U1005 Remote Indoor Temperature Sensor (Optional)
1. 2. 3. Choose a location (see Fig. 25) for mounting the sensor on an inside wall about 5 ft (1.5m) above the floor. Be sure wire distance between C7189U1005 and EIM is less than 200 feet. Make sure there is good air circulation at average temperature at the chosen location. Avoid the following locations because they can introduce errors in sensor measurements. See Fig. 25. a. Hot areas caused by: (a)Concealed pipes or ducts. (b)Drafts from fireplaces or other heat sources. (c)Convection or radiant heat from the sun or electrical equipment. b. Cold areas caused by: (a)Concealed pipes or ducts. (b)Drafts from windows and doors. (c)Unheated areas on the other side of the wall location. c. Dead air areas: (a)Behind doors, furniture and curtains. (b)In corners and alcoves. Mark the area on the wall selected for mounting the C7189U1005 Sensor. Run wire cable to a hole at the selected wall location. Pull approximately three inches of wire through the opening. Color-coded, 18-gauge thermostat wire is recommended.
Wiring must comply with applicable codes, ordinances and regulations. 1. Wire C7189U1005 Indoor Sensor to IN1and IN2 terminals on the EIM. For an example of general wiring of C7189U1005, see Fig. 26 to wire one sensor and Fig. 27 to wire multiple sensors. Push excess wire back into the hole. Plug the hole using nonhardening caulk, putty or insulation to prevent drafts from affecting performance. Remove C7189U1005 cover. Mount C7189U1005 to the wall using the screws and anchors provided. Level the C7189U1005 for appearance only. Device functions correctly even when not level. Install C7189U1005 cover.

Dehumidification 0 Fan Action 1 Whole house 0 dehumidification 1 lockout Southern 0 Dehumidification 1 Away Mode Southern 0 Dehumidification 1 Away Mode Fan 2 Setting Southern 76 Dehumidification 70-80 Away Mode Low Limit Temperature Setting Southern 85 Dehumidification 70-99 Away Temperature Setting
System fan turns on with dehumidifier Only shown if ISU379 = 3. Dehumidifier operates independent of system fan Disabled Enabled No Yes Fan Auto Fan On Fan Circulate Default = 76F 70F80F Not shown if ISU379 = 0. ISU 391-394 will only be shown if ISU390 = 1. If ISU391 = 1 or 2 to help remove condensation from the air handler and the A-coil, some humidity may be re-introduced into the living space. The air conditioner will be allowed to cool the living space to this temperature to meet the humidity setting that set in ISU394.

Default = 85F 70F99F

The A/C will maintain this temperature provided the humidity setting is satisfied. This temperature setting can not be set lower than the temperature set in ISU 392.
ISU Parameter Number 394 Installer Setup Name Southern 65 Dehumidification 40-70 Away Dehumidification Setting Ventilation control 4 Number of bedrooms Total house Sq. Ft. Ventilation CFM Max ventilation percentage limit 2 1-10-30-30-Settings (Factory Defaults Shown in Bold) Default = 65% 40%70% relative humidity
Notes Set the desired humidity level to maintain within the living space
No ventilation Ventilation on at all times Ventilation on except during sleep period Vent all with lockouts Vent off sleep with lockouts Default = bedrooms Default = 1000 sq. ft. 10005000 sq. ft. in increments of 100 Default = 160 CFM 30195 CFM in increments of 5 Default = 50% 30%60% unlimited
If ISU300 = 0, ISU401-405 will not be shown. Not ASHRAE Not ASHRAE

403 404

The thermostat will determine if ventilation is meeting ASHRAE standard 62.2. The display will show a P above the setup number if the setting passes the ASHRAE standard, or F if it does not. Best practice is to move the setting down until F is displayed, then move up one setting to the minimum passing value.
Ventilation Fan Action Ventilation in High Humidity Ventilation lockout Ventilation lockout high temperature
110 -10 -20 -15 -5 -65 E 40.5 43.5 -23.5 -29 -26 -20.5 -18 1.5 4.15.5 18.5
Vent on will force fan on also Vent will not force fan ON On Off Disabled Lockout for high temperatures Lockout for low temperatures Lockout for high and low temperatures 100F 90F 95F 105F 110F -10F -20F -15F -5F 0F Disabled 35F 40F 45F 50F 55F 60F 65F 38C 32C 35C 40.5C 43.5C -23.5C -29.0C -26.0C -20.5C -18.0C 1.5C 4.5C 7.0C 10.0C 13.0C 15.5C 18.5C The DATS will cycle the cooling off at the selected temperature to prevent coil freezing. Only shown if ISU372 and ISU400 are not set to 0. When set to On will use ventilation to remove humidity when thermostat is in the heat mode. Outdoor temperature sensor required for high and low temperature lockouts.

SHOWS THE CURRENT INSIDE TEMPERATURE

DOWN ARROW

LOWERS TEMPERATURE SETTING

SHOWS FAN SETTING

SET TO TEMPERATURE
SHOWS THE CURRENT SET TEMPERATURE

SELECTS ON/AUTO/CIRC

UP ARROW
RAISES TEMPERATURE SETTING

CLOCK SCREE

ENTERS SCHEDULING MODE
SETS THE TIME FORWARD OR BACK
SHOWS ADDITIONAL ACCESSORY AND MAINTENANCE OPTIONS
SHOWS CURRENT SYSTEM POSITION
DISPLAY CURRENT TIME OF DAY, HOLD TIME REMAINING OR NUMBER OF VACATION DAYS REMAINING

FOLLOWING SCHEDULE

SHOWS THE THERMOSTAT IS FOLLOWING THE PROGRAMMED SCHEDULE

M23501

SETS A PERMANENT HOLD AND ACTIVITIES VACATION HOLD
LOCKS OUT THE SCREEN TO ALLOW FOR CLEANING M23500

System and Fan Settings

System
The System key selections vary based on your heating and/or cooling system type. Heat Thermostat controls the heating system. Off Both heating and cooling systems are off. Cool Thermostat controls the cooling system. Auto Thermostat automatically changes between heating and cooling operation, depending on indoor temperature. Em. Heat Emergency heat cycles to maintain temperature. Compressor is locked out and auxiliary heat turns on as needed.

1. 2. 3.

Press the More key until the inside humidity level setpoint is shown. Use Up and Down arrow keys, located to the right of the humidity setpoint, to set desired humidity level. Press Done key.
Control Dehumidification Level
The VisionPRO IAQ Touchscreen Thermostat reads the inside humidity level and allows for a dehumidification setting, and can be set to dehumidify using the air conditioner or a whole house dehumidifier.

CURRENT INDOOR HUMIDITY

The Fan key selections vary based on the heating and/or cooling system type. On Fan runs continuously. Use this setting for improved air circulation or for more efficient central air cleaning. Auto fan follows the fan program schedule. Circ fan runs randomly approximately 35% of the time. Use this setting for improved air circulation or for more efficient central air cleaning when you do not want the fan running continuously.

M23520

Ventilation occurs two ways: AUTOMATIC Uses installer setup to determine amount of ventilation required based on house and equipment size. To disable automatic ventilation, switch the ventilation setting to Off. The user can still use the timer to request ventilation. ON DEMAND User can also set a vent timer that will circulate fresh air into the home for a set period of time from 20 to 180 minutes in 20minute increments. The vent timer is enabled whether ventilation is set to Auto or Off.

M23515

Fig. 29. Display when controlling a whole-house dehumidifier. 1. 2. 3. Press the More key until the inside humidity percent and dehumidification setpoint are shown. Use Up and Down arrow keys, located to the right of the dehumidifier setpoint, to set desired humidity level for dehumidification in the summer. Press Done key.

Minutes

MORE CANCEL

M23519

Ventilation Control
Ventilation setup options include ISUs 400, 401, 402, 403, and 404. Combined, these will determine a percentage of maximum ventilation limit. The thermostat will calculate whether or not this level of ventilation meets ASHRAE standard 62.2. If ASHRAE 62.2 is met a P will appear in the display above the setup number. If ASHRAE 62.2 is not met an F will appear in the display above the setup number. Passing ASHRAE 62.2 is only applicable when vent is running. For example, if installer has set to not vent during sleep period, ASHRAE 62.2 would be met at all times except during sleep period.
VENTILATION IN HIGH HUMIDITY CONDITIONS (SETUP FUNCTION 0406) If Ventilation Control is available (setup function 0400 set to 1 or 2), this allows the ventilation equipment to turn on if the humidity rises approximately 10% above the RH setting in heating mode to exhaust the extra humidity.

HEAT PUMP OPERATION

Heat Pump LED Indication
A red LED indication is located in the upper right corner of the thermostat. It is only visible when lighted. When the L terminal is wired to an equipment monitor, the LED signals when a check or fail signal is sent to the thermostat from the system. This is operational in the Heat, Off, Cool or Auto positions.

M23504

SAVING CHANGES

Press Edit key.

M19956
OK TO PICK MULTIPLE DAYS SCREEN LOCKED
SYSTEM EM HEAT HEAT OFF COOL AUTO SCHED DONE EDIT

CANCEL PERIOD

NOTE: To set a Program Schedule for the remaining days of the week, repeat steps 19. Example: If MonFri was selected first, go back and repeat steps 19 for Sat and Sun. 10. To exit schedule without saving changes, press Cancel key any time.

M22553

Cancel a Schedule Period
1. 2. 3. 4. 5. Press Sched key. Press Edit key. Select the Day(s) of the week desired. Press schedule period you want to cancel (Wake, Leave, Return or Sleep). Once selected, the period flashes. Press Cancel Period key.
It is OK to pick multiple days. Select any combination of days to edit. These days are scheduled with the same times and temperatures. Check marks appear next to days selected.

FAN ON AUTO CIRC

OK TO PICK MULTIPLE DAYS
SYSTEM EM HEAT HEAT OFF COOL AUTO SCHED DONE

M22446

RETURN

M19955

The time, temperature(s) and fan setting disappear. The bar above the selected period is removed, indicating the scheduled period was cancelled.
Press Wake key. Once pressed, Wake flashes to show it is selected.
NOTE: To reinstate a schedule period, press arrow keys to set desired time and temperatures.
Table 10. Fan Program Operation and Screen Status. Fan Program Schedule Call for Action Fan Status shown on Screen

Fan Setting

Energize Terminal

Auto On Circ Circ

None Fan None Fan

None G None G

Auto Auto/On Auto/Circ Auto/Circ

Auto Auto Auto

M19957

Press Done key.

Manual Override of Fan Schedule
Autofan is automatically following the Fan schedule (choices are Auto, On or Circulate). Onoverrides Fan schedule. Fan is continuously On. Circoverrides Fan schedule. Fan circulates randomly for approximately 35% of time until the Auto position is selected. Table 11. Manual Override of Fan Schedule Operation. Fan Schedule Override Setting On Circ Circ Autoa Screen Message Under Fan Setting On Circ Circ

Fan Schedule

Press Fan key while in the Scheduling Screen to program the System Fan. Choices available from the Scheduling Screen: Auto (default position)fan runs with equipment. Programmable for all schedule periods (Wake, Leave, Return and Sleep). Onfan runs continuously (programmable for all schedule periods). Circfan runs randomly for approximately 35% of schedule period (programmable for all schedule periods).

Fan Setting Auto Auto Auto On
Call for Action Fan None Fan
Energize Terminal G None G

Circ Circ Autoa On

None Fan

None G

Circ Circ

M22447

Override resumes the Fan Program in each schedule period (Wake, Leave, Return and Sleep)

Fan Control

If the Fan program is scheduled, Auto is shown and any programmable mode that is set; for example, if during Wake period, Fan is set to Auto, only Auto is shown in the Fan area. However, if during the Wake period, fan is scheduled to On, both Auto and On are shown. Auto indicates fan is running its schedule; On indicates Fan schedule is set to On.

OPERATE VISIONPRO IAQ

Set Time
1. 2. Press Clock. Use arrows to set current time.

M23505

PERMANENT HOLD Permanent Hold changes the temperature setting until Permanent Hold is cancelled. 1. 2. Press Hold key. Permanent Hold appears on the screen. Press Up or Down arrow next to the temperature you want to set during Hold.

M19958

IMPORTANT The current day of the week should already be set correctly. If not, see Installer Setup to set the day.

Permanent Hold

SCREEN CANCEL

M23507

Set Temperature Overrides
The thermostat has four temperature override options: Hold Temperature Until, Permanent Hold, Vacation Hold, and Southern Dehumidification Away Setting. HOLD TEMPERATURE UNTIL (TEMPORARY HOLD) Holds temperature temporarily until the next scheduled period time or until the time the user sets. 1. Press Up or Down arrow next to the temperature you want to adjust. Hold Temperature Until time appears on the screen. The Hold Temperature Until time defaults to the start time of the next scheduled period. 3.
Press Cancel key to cancel Permanent Hold and resume the schedule.
NOTE: The Time Up and Down arrows are shown for approximately seven seconds. Pressing on the screen time (where the Hold Temperature Until time is shown) allows the arrows to reappear. 2. Press Up or Down arrow next to the Time key to set desired time for the thermostat to resume schedule.
VACATION HOLD Changes temperature setting for a designated number of days. 1. Press the Up and Down arrow keys to set the desired temperature while away on vacation. Notice that Hold Temperature Until time is shown on the screen. (This is the time the Vacation Hold override expires after the number of days ends.) 2. Press Hold key twice. Screen shows Hold Temperature Until one day. 3. Press Up and Down arrow keys to change the number of Days you desire thermostat to override the schedule. NOTE: Days Up and Down arrows appear for approximately seven seconds. Pressing just below Hold Temperature Until on the screen allows the Days Up and Down arrows to reappear.

Hold Temperature Until

Hold Temperature Until DAYS

Humidity Humidity

M23506

M23508

Press the Cancel or Sched key to cancel Hold Temperature Until and resume schedule.
To cancel the Vacation Hold override early, press the Cancel key.
NOTE: Once Hold Temperature Until time is reached, the thermostat shows Following Schedule on the screen to indicate that Temporary Hold has ended.
NOTE: When the number of days of Vacation Hold expires, the screen shows Following Schedule to indicate that Vacation Hold has ended.
SOUTHERN DEHUMIDIFICATION AWAY SETTING Southern Dehumidification Away Setting is an option that only appears if ISU number 390 is set to yes. It can be used to maintain the desired humidity level and temperature in the living space while away for extended periods of time. See ISU Numbers 390394 for more information.

Screen Locks

SCREEN LOCKED

HEAT COOL

M23509

M23521

Partially Locked Screen
When partially locked, the screen indicates Screen Locked for 5 to 7 seconds whenever the user attempts to press a key that is locked. Pressing a locked key, while Screen Locked is shown, flashes Screen Locked on the screen. In this mode, all keys are locked except the Temperature Up and Down arrow keys: User can change temperature up or down but cannot change schedule settings. Temporary temperature change lasts until next scheduled period and that time shows on screen. To cancel temperature override and begin following schedule, press Cancel key. To unlock screen, see Installer Setup section.
Press Hold three times to enter the Southern Dehumidification Away Setting. These settings can only be changed in installer setup.

Clean Thermostat Screen

The thermostat has a touch screen interaction. Follow these steps to clean the screen without making thermostat changes: 1. Press the Screen key. Thermostat locks out all touch keys for 30 seconds to allow for cleaning.

Fully Locked Screen

OK TO CLEAN SCREEN
In this mode, all keys are locked and not functional. To unlock screen, see Installer Setup section. The screen continuously displays Screen Locked.

Humidification Control

If you have a humidifier and outdoor temperature sensor, you can use Frost Control to reduce window condensation. 1. 2. Press MORE until the humidifier screen is displayed. Press the Up or Down arrow to set the humidity and Frost Control level. (Use a lower Frost Control level if frost appears on windows. Use a higher setting if the air is too dry.) Press DONE to save and exit, or press CANCEL to exit without saving changes.

Recovery

UV Lamp Reminder
The UV Lamp change reminder must be turned on from the Installer Setup. Once expired, the screen flashes, Change UV Lamp and a Reset key appears. Press the Reset key to reset the change reminder. The remaining calendar days can be viewed by pressing the More key.

68-028704 32

M23512
NOTE: It takes about a week for the thermostat to adjust to local weather, the schedule, the construction of the home and the heating and/or cooling system. Each day it adjusts the next days recovery start time accordingly.

Minimum Off-Timer

The Thermostat has built-in compressor protection (minimumoff timer) that prevents the compressor from restarting too early after a shutdown. The minimum-off timer is activated after the compressor turns off. If there is a call during the minimum-off timer, the thermostat shows Wait in the display.

P+I Control

The thermostat microprocessor-based control requires that the user understands temperature control and thermostat performance. A conventional mechanical or electronic thermostat does not control temperature precisely at setpoint. Typically there is an offset (droop) in the control point as the system load changes. This is a phenomenon that most people in the industry know and accept. Many factors contribute to offset including switch differential, thermal lag, overshoot, cycle rates and system load. The thermostat microprocessor simultaneously gathers, compares and computes data. Using this data, it controls a wide variety of functions. The special proprietary algorithm (program) in the thermostat eliminates the factors causing offset. This makes temperature control more accurate than the conventional mechanical or electronic thermostats. The temperature control algorithm is called proportional plus integral (P+I) control. The thermostat sensor, located on the thermostat or remote, senses the current space temperature. The proportional error is calculated by comparing the sensed temperature to the programmed setpoint. The deviation from the setpoint is the proportional error. The thermostat also determines integral error, which is a deviation based on the length of error time. The sum of the two errors is the (P+I) error. The cycle rate used to reach and maintain the setpoint temperature is computed using the P+I. The addition of the integral error is what differentiates the thermostat from many other electronic and mechanical thermostats. See Fig. 33.

THERMOSTAT COOL SETPOINT PROPORTIONAL COOL CONTROL POINT

TEMPERATURE

M23513
When the minimum-off timer expires, Cool On or Heat Ona appears in the display and the compressor and fan turn on. _________

Pumps only.

Inside Humidity Level
The humidity level in the home is shown in the lower right corner of the Home Screen. NOTE: If an outdoor temperature sensor is present, the outdoor temperature will be displayed in this location rather than the indoor humidity. To see indoor humidity, display the humidity settings menu.

P+I CONTROL POINT

P+I CONTROL POINT PROPORTIONAL HEAT CONTROL POINT THERMOSTAT HEAT SETPOINT HEATING COOLING

M23678

0 PERCENT LOAD
Fig. 33. Proportional temperature control versus P+ I temperature control.
If thermostat is set to Auto Changeover System mode, press the More key until the humidity level is shown on the screen.
Table 12. Sensor Resistance at Outdoor Temperature. Outdoor Temperature F -20 -18 -16 -14 C -28.9 -27.8 -26.7 -25.6 -24.4 -23.3 -22.2 -21.1 -20.0 -18.9 -17.8 -16.7 -15.6 -14.4 -13.3 -12.2 -11.1 -10.0 -8.9 -7.8 -6.7 -5.6 -4.4 -3.3 -2.2 -1.1 0.0 1.1 2.2 3.3 4.4 5.6 6.7 7.8 8.9 10.0 Ohms of Resistance Outdoor Temperature F 120 C 11.1 12.2 13.3 14.4 15.6 16.7 17.8 18.9 20.0 21.1 22.2 23.3 24.4 25.6 26.7 27.8 28.9 30.0 31.1 32.2 33.3 34.4 35.6 36.7 37.8 38.9 40.0 41.1 42.2 43.3 44.4 45.6 46.7 47.8 48.9 Ohms of Resistance 4317

M23679

-12 -10 -8 -6 -4 -6 8
C7089U1006 Outdoor Temperature Sensor

Operation

When installed with Thermostat Installer Setup Number 0342 set to 1, the outside temperature can be displayed on the thermostat. See Fig. 34.
Fig. 34. Outside temperature reading on VisionPRO IAQ Thermostat. The C7089U1006 Outdoor Sensor converts outdoor ambient temperature to a resistance that the thermostat can interpret. The C7089U1006 has a negative temperature coefficient (NTC), which means that resistance decreases as the temperature increases. See Table 12.

Checkout

Allow C7089U1006 Outdoor Sensor to absorb outdoor air for a minimum of twenty minutes before taking a reading. With an accurate thermometer (1F [0.5C]) measure the temperature at the sensor location, allowing time for the thermometer to stabilize before reading. To verify sensor resistance, remove one wire from one of the C7089U1006 60-in. leadwires. Use an ohmmeter to measure the resistance across the sensor. Then verify the sensor accuracy with the temperature/resistance in Table 12.
C7189U1005 Remote Indoor Temperature Sensor

The C7189U1005 Wall Mount Temperature Sensor is calibrated at the factory and cannot be recalibrated in the field. 027 Table 13. Sensor Resistance at Room Temperature. Room Temperature F C 4.4 5.6 6.7 7.8 8.9 10.0 11.1 12.2 13.3 14.4 15.6 16.7 Ohms of Resistance Room Temperature F C 22.2 23.3 24.4 25.6 26.7 27.8 28.9 30.0 31.1 32.2 33.3 34.4 Ohms of Resistance 119 121
Table 14. VisionPRO IAQ Error Codes. Error Code Meaning Faulty thermostat (must be replaced) Duplicate thermostat zone detected Duplicate UV timer Duplicate filter timer Duplicate humidifier pad timer Duplicate indoor humidity sensor Compressor should be running but it is not Duplicate outdoor temperature sensor Faulty post-coil air discharge sensor Faulty outdoor temperature sensor Faulty indoor humidity sensor Heating/cooling equipment is missing Data interface is continuously busy Thermostat is not receiving data from other equipment Faulty discharge air temperature sensor Faulty temperature sensor Duplicate post-coil air discharge sensor

TROUBLESHOOTING

Table 15. Troubleshooting. Symptom Display does not come on Possible Cause Thermostat is not being powered Action Check if the thermostat is mounted and latched on the wall plate. If not: Mount and latch the thermostat on the wallplate. Check if the circuit breaker is tripped or the fuse is blown; if it is: Reset the circuit Breaker or replace the fuse. Check if the power switch at the equipment is in the off position; if it is: Set to the on position. Check for 24 Vac between terminals 2 and 3 at the thermostat. Replace any broken wires if 24Vac is not present. Replace thermostat if 24Vas is present. Check for 24 Vac between terminals R and C at the Equipment interface module. If 24Vac is not present consult electrician. If 24 Vac is Present replace Equipment interface module. Check temperature setpoints. Check installer setup Numbers 0600 and 610; modify as needed. Check Installer Setup Number 670 to change keypad locked options. Wait up to 5 minutes for the system to respond (Wait is displayed on the Thermostat home screen. Set system selection to correct setting.
Temperature setting does not change
The upper and lower temperature limits reached Keypad is fully locked
Heating or cooling does not come on and thermostat is not calling for heat or cool. Heating or cooling does not come on and thermostat is calling for heat or cool.
Thermostat minimum off timer is activated System selection is not set to Heat or Cool
Heating or cooling equipment is not Check Wiring. Check installer setup number 172 and verify the correct operating system type is chosen. Verify operation of equipment in system test mode. Check for 24 Vac at the equipment on the secondary side of the transformer between power and common. If voltage is not present check the heating equipment to find the cause of the problem. Check for 24 Vac between the heat terminal(s) on the equipment interface Module and transformer common. If present check heating equipment to find the cause of the problem. Check for 24 Vac between the heat terminal(s) on the HVAC equipment and system transformer common. If voltage is not present check for loose or broken wires between the EIM and heating equipment. End the call for heat at the thermostat then repeat the call for heat. Check the communication LED on the EIM board. If the LED does not blink, check communication wiring (wire between terminal 1 on both the EIM and thermostat. If the LED does blinks correctly, check for 24 Vac between heating terminals on the EIM and the system common. If 24 Vac is not present check the R to Rh connection on the EIM, if the connection is good replace the EIM.