Honeywell TH8320U Touch Screen Programmable Thermostat Installation Instructions

Honeywell TH8320U Touch Screen Programmable Thermostat 

APPLICATION
The TH8320U and TH8321U Touch Screen Universal Programmable Thermostats provide electronic control of 24 Vac heating and cooling systems or 750 mV heating systems. See Table 1 for a general description

Table 1. TH832 Thermostats Description

Model	Power Method	Changeover	System Selection	Fan Selection	Comments
TH8320U	Batteries or common wire	Automatic or manual selectable	Heat-Off-Cool- Auto (Em. Heat for heat pumps)	On-Auto-Circ	System and Fan selection vary based on system type
TH8321U					System and Fan selection vary based on System type. Humidity sensor to control dehumidification.

MERCURY NOTICE
If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of it properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of the old control.

INSTALLATION

When Installing this Product…

1. Read these instructions carefully. Failure to follow the instructions can damage the product or cause a hazardous condition.
2.  Check the ratings given in the instructions to make sure the product is suitable for your application.
3.  Installer must be a trained, experienced service technician.
4. After completing the installation, use these instructions to check out the product operation.

Selecting Location

Install the thermostat about 5 ft. (1.5m) above the floor in an area with good air circulation at an average temperature. See Fig. 1.
Do not install the thermostat where it can be affected by:

• Drafts or dead spots behind doors and in corners.
• Hot or cold air from ducts.
• Radiant heat from sun or appliances.
• Concealed pipes and chimneys.
• Unheated (uncooled) areas such as an outside wall behind the thermostat.

Installing Wallplate
CAUTION

Electrical Hazard.
Can cause electrical shock or equipment damage.
Disconnect power before wiring. The thermostat can be mounted horizontally on the wall or in a 4 in. x 2 in. (101.6 mm x 50.8 mm) wiring box.

1. Position and level the wallplate (for appearance only).
2. Use a pencil to mark the mounting holes.
3. Remove the wallplate from the wall and, if drywall, drill two 3/16-in. holes in the wall, as marked. For firmer materials such as plaster, drill two 7/32-in.
   holes. Gently tap anchors (provided) into the drilled holes until flush with the wall.
4. Position the wallplate over the holes, pulling wires through the wiring opening. See Fig. 2.
5. Insert the mounting screws into the holes and tighten them.

WIRING (FIG. 5-16)
All wiring must comply with local electrical codes and ordinances.

1. Select a set of terminal identifications (Table 2) that corresponds with the system type (conventional or heat pump in Fig. 3).
2.  Loosen the screws for the appropriate system type selected; see Table 2. Insert wires in the terminal block under the loosened screw. See Fig. 4.
3. Securely tighten each screw.
4. Push excess wire back into the hole.
5. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat

Table 2. Selecting Terminal Identifications for System Type.

System Type	Wallplate Terminal Identifications	Wiring Diagram Reference
Standard Heat/Cool	Conventional	5, 6
Heat Only	Conventional	7
Heat Only with Fan	Conventional	8
Heat Only Series 20	Conventional	9
Cool Only	Conventional	10
Standard Multistage up to 2 Heat/2 Cool	Conventional	11, 12
Heat Pump with No Auxiliary Heat	Heat Pump	13, 14
Heat Pump with Auxiliary Heat	Heat Pump	15, 16

IMPORTANT
Use an 18-gauge thermostat wire.

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY-INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE
   1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
   2. FACTORY-INSTALLED JUMPER.
   3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.

Fig. 5. Typical hookup of conventional single-stage heat and cool system with single transformer (1H/1C conventional).

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. REMOVE THE FACTORY-INSTALLED JUMPER.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE
   1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
   2. REMOVE THE FACTORY-INSTALLED JUMPER.
   3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
      FROM THE THERMOSTAT CABLE
4. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
5. FACTORY-INSTALLED JUMPER.
6. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.

Fig. 12. Typical hookup of conventional multistage two-stage heating and two-stage cooling in a two-transformer system (2H/2C or 2H/1C or 1H/2C conventional).

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. FACTORY-INSTALLED JUMPER.
3. THE “O/B” TERMINAL IS SET TO CONTROL AS EITHER “O” OR “B” IN THE INSTALLER SETUP. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE FROM THE THERMOSTAT CABLE.

 

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY-INSTALLED JUMPER.
2. OUTDOOR SENSORS ARE REQUIRED IN A SYSTEM WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT.
3. OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
   FROM THE THERMOSTAT CABLE.
4. MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS AN EQUIPMENT MONITOR, BUT CAN ALSO BE USED AS A 24 VAC OUTPUT. SEE THE “L TERMINAL” SECTION FOR MORE INFORMATION. THE “O/B” TERMINAL IS SET TO CONTROL AS EITHER “O” OR “B” IN THE INSTALLER SETUP.

 

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY-INSTALLED JUMPER.
2. OUTDOOR SENSORS ARE REQUIRED IN SYSTEMS WITH FOSSIL FUEL BACKUP HEAT THAT IS NOT USING AN EXTERNAL FOSSIL FUEL KIT.
   OPTIONAL OUTDOOR OR INDOOR REMOTE SENSOR. AVAILABLE ON SELECT MODELS. WIRES MUST HAVE A CABLE SEPARATE
3. FROM THE THERMOSTAT CABLE. MUST CONNECT THE 24 VAC COMMON WHEN USING L. THE TERMINAL IS SHOWN AS AN EQUIPMENT MONITOR, BUT CAN ALSO BE USED AS
4. A 24 VAC OUTPUT. SEE THE “L TERMINAL” SECTION FOR MORE INFORMATION. THE “O/B” TERMINAL IS SET TO CONTROL AS EITHER “O” OR “B” IN THE INSTALLER SETUP.

Powering the Thermostat
There are two different ways to power the thermostat:

1. Batteries (three AAA alkaline).
2. 24 Vac Common wire.

Wiring 24 Vac Common
Wire the common side of the transformer to the C screw of the thermostat wall plate. When installing a single transformer system, keep the jumper wire between the R and Rc screws. When installed in a two-transformer system, use the common from the cooling transformer to connect to the C screw and remove the jumper wire between the R and Rc screws.

Inserting Batteries (Optional)

If not using a 24 Vac Common to power the thermostat, install three AAA alkaline batteries (included) in the back of the thermostat. Make sure the positive and negative terminals are oriented correctly, as marked on the device. See Fig.17.

Mounting the Thermostat

1. Align the terminal screw blocks with the pins on the back of the thermostat.
2. Push the thermostat straight onto the wall plate. See Fig. 18.

Adjusting Real-Time Clock

Setting Calendar and Time

Locate and remove the tab labeled Remove in the lower left corner on the thermostat back. The tab must be removed to activate the real-time clock. See Fig. 19This thermostat is designed to automatically keep the current time and day in memory for up to ten years under normal use once the calendar is set. When the thermostat is first powered, the display is ready for the calendar date to be entered. See Fig. 20.

IMPORTANT
The tab on the back of the thermostat in the lower left corner must be removed for this feature to be active.

Using the Thermostat
The thermostat has a touchscreen interface. Words or symbols appear, highlighting the keys, as necessary, to complete tasks. Always press the keys with your fingertips. Sharp instruments like a pen or pencil point can damage the thermostat.

1. Use the arrow keys to set the Year, Month, and Day, as shown in Fig. 20.
2.  Press the Done key.
3. Use the arrow keys to set the current time. See 0Fig. 20.
4. Press the Done key.

OPERATION

System and Fan Settings
The System’s default setting is Heat and the Fan default setting is Auto.

SYSTEM SETTINGS
Heat: The thermostat controls the heating system.
Off: Both heating and cooling are off.
Cool: The thermostat controls the cooling system.
Auto: The thermostat automatically changes between heating and cooling systems, depending on indoor temperature. (See Installer Setup section.)
Em Heat: Emergency heat cycles to maintain temperature. The compressor is locked out. (Used only for heat pump systems with backup heat.)

FAN SETTINGS
The Fan setting can be programmed into the thermostat schedule for each period (Wake, Leave, Return, Sleep). See the Owners Guide for additional information.

LED Indication (Requires 24 Vac Common Connection)

An LED indicator is located in the upper right corner of the thermostat. It is only visible when lighted:  It indicates when the thermostat is in the Emergency
Heat mode. When in Em. Ht. mode, the L terminal is continuously energized and the LED is on. 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. See Fig. 21. (This can occur only when the thermostat is not in Em. Ht. mode.)

Preprogrammed Settings
Table 3 shows the default program settings. See the Owners Guide for complete instructions on changing the program.

Table 3. Default Program Settings.

Schedule Period	Time	Setpoints		Fan Setting
		Heat	Cool
Wake	6:00AM	70°F (21°C)	78°F (25.5°C)	Auto
Leave	8:00AM	62°F (16.50C)	85°F (29.50C)	Auto
Return	6:00PM	70°F (21°C)	78°F (25.5°C)	Auto
Sleep	10:00PM	62°F (16.5°C)	82°F (28°C)	Auto

INSTALLER SETUP
This Universal Thermostat works with many different system types. To operate correctly, the thermostat must be set up to operate the installed heating and/or cooling system.

Installer Setup Menus
Main Menu: Offers the most commonly used options. It is necessary to enter this menu to set the thermostat to the type of system it is operating. Many applications use only the Main Menu. Regional Menu: Offers choices often changed due to a particular area or region. For example, temperature display in Fahrenheit or Celsius is offered in this menu. Advanced Settings Menu: Offers more settings to fully customize the thermostat. Many of these settings do not require changing from the factory settings.

Entering Installer Setup

1. The thermostat must be powered either with Alkaline AAA batteries or with 24 Vac Common wire.
2. From the home screen, press the System key. (Press the Done or Cancel key to return to the home screen.)
3. 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 the screen changes. See Fig. 22.
4. The Installer Setup Number is displayed in the lower left. It is a four-digit code beginning with zero. The factory setting or other choice selection is displayed in the lower right. See Fig. 23. This is a two-digit code shown in the Options column of Table 4.

Changing Installer Setup Selections

1. Advance to the next Installer Setup Number by pressing the up and down arrow keys to the right of the four-digit Installer Setup Number. See Fig. 23.
2. Change the factory Setting Options by pressing the up and down arrow keys to the right of the two-digit code selection. See Fig. 23.

Exiting Installer Setup

1. Press the Done key to exit the Installer Setup screen.

IMPORTANT
The three Installer Setup Menus (Tables 4-6) show all the available options. These options customize themselves as you make selections to of the Installer Setup. Therefore, not all Installer  Setup Selections are shown or are available to change.

Table 4. Main Installer Setup Menu

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Option	Description	Options	Description
Not used.	1 thru 0099	–	–	–	–	–
Date (Year Upper)	0120	20	Set first two digits of current calendar year (20 for year 2005, etc)	21	21 -first two digits of current calendar year (21xx)	2000 -2178 available
Date (Year Lower)	0130	04	Represents last two digits of current calendar year (2004).	00 -99	Select last two digits of current calendar year.	2001-2178 available
Date (Month)	0140	6	Digit(s) represents current calendar month.	1-12	Select number that represents current calendar month.	–
Date (Day)	0150	15	Digit(s) represents current calendar date.	1-31	Select number that represents current calendar date.	–
Schedule Options	0160	4	7-day programming	0	0 -nonprogrammable	–

 

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Option	Description	Options	Description
System Type Selection	0170	1	1 Heat/1Cool	1-12	1-1heat/1cool 2-single-stage heat pump(no aux. heat) 3-heatonly(no  fan) 4-   heatonly(with fan) 5-   hot water Series 20 (3-wire or normally open zone valves) 6-   cool only 7-2 heat/1cool heat pump 8-2 heat/2 cool multistage conventional 9-2 heat/1cool multistage conventional 10-1 heat/2 cool multistageconventional 11-2 heat/2 cool heat pump (with no auxiliary heat) 12-3 heat/2 cool heat pump (with auxiliary heat)	Available options and defaults vary by thermo- stat. System selection automatically modifies some default settings and/ or hides other Installer Set- up options.
Fan Operation	0180	0	Conventional applications where equipment controls fan operation in heat mode.	1	Heat pump or electric heat applications where thermostat controls fan operation in heat mode.	Only shown if conventional system is selected. If heat pump is chosen, fan defaults to electric.
Reversing Valve (O/B) Operation	0190	0	O/B terminal is energized for reversing valve in cooling	1	O/B terminal is energized for reversing valve in heating	Only shown if heat pump system is chosen.
Backup Heat Source (Auxiliary Heat)	0200	0	Heat pump backup heat source is electric.	1	Heat pump backup heat source is fossil fuel.	Only shown if 2 heat/1 cool or 3 heat/2 cool heat pump is chosen.
External Fossil Fuel Kit	0210	1	External fossil fuel kit is controlling heat pump backup heat	0	No external fossil fuel kit is controlling heat pump backup heat. This thermo- stat controls the backup fossil fuel heat with outdoor sensor (C7089U).	Only shown if fossil fuel is chosen as backup heat source.
Cycles per hour (cph) for 1st Stage Compressor	0220	3	Compressor Stage 1 cycles per hour (cph)	1-6	1-6 available; 3 is recommended.	–
Cycles per hour (cph) for 2nd Stage Compressor	0230	3	Compressor Stage 2 cycles per hour (cph)	1-6	1-6 available; 3 is recommended.	Only shown if two stages of cool are selected.

 

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Option	Description	Options	Description
Cycles per	0240	5	Conventional Heat	1-12	1-12 available; typical	Not shown if
hour (cph) for			Stage 1 cycles per		settings:	system
1st Stage			hour (cph)		1-1 cph used for steam	selection is
Conventional					or gravity system.	heat pump.
Heat					3-3 cph used for hot	Selection in
					water systems or high	this stage
					efficiency (90% or better)	changes
					fossil fuel forced air	default cph
					systems.	for 2nd stage
					5-5 cph used for	heat.
					standard fossil fuel forced
					air systems.
					9-9 cph used for electric
					forced air heat systems.
Cycles per	0250	5	Cycles per hour (cph)	1-12	1-12 available; typical	Only shown if
hour (cph) for			for 2nd Stage		settings:	two stages of
2nd Stage			Conventional Heat or		1-1 cph used for steam	heat are
Heat			Auxiliary Heat for		or gravity system.	selected.
			2 H/1C Heat Pump		3-3 cph for hot water
			Systems		systems or high efficiency
					(90% or better) fossil fuel
					forced air systems.
					5-5 cph for standard
					fossil fuel forced air
					systems.
					9-9 cph used for electric
					forced air heat systems
					(electric auxiliary heat for
					heat pump systems).

 

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Option	Description	Options	Description
Cycles per hour (cph) for 3rd Stage Heat	0260	9	Cycles per hour (cph) for Auxiliary Heat in 3H/2C Heat Pump Systems	1-12	1-12 available; typical settings: 1-1cph for steam or gravitysystem. 3-3 cph for hot water systems or high efficiency (90% or better) fossil fuel forced air systems. 5-5 cph for standard fossil fuel forced air systems. 9-9 cph for electric forced air heat systems. (electric auxiliary heat for heat pump systems).	Only shown if 3H/2C heat pump system is selected.
Cycles per hour (cph) for Em Heat	0270	9	Cycles per hour (cph) for Emergency Heat	1-12	1-12 is available; typical settings: 3-3 cph for hot water systems or high efficiency (90% or better) fossil fuel forcedairsystems. 5-5 cph for standard fossil fuel forced air systems. 9-9 cph for electric heat systems.	Only shown if 2 heat/1 cool or 3 heat/2 cool heat pump is selected.
Continuous Backlight	0280	0	Backlight not on continuously. Thermostat backlight comes on with each key press.	1	Backlight is on continuously (thermostat must have a common wire attached for this function).	Option is always shown; however, continuously on backlight works only if thermostat is wired with 24 vac Common.
Additional Menu Choices	0290	0	Only main menu options are shown. Installer Test Options shown next (Table 7).	1,2	1-   Main Menu and Regional Settings are shown plus Installer Test (Tables 5 and 7 only).   2-   All remaining Menu/ Options shown plus Installer Test (Tables 5, 6 and 7).	The majority of application require only the Main Menu Options.

Table 5. Regional Settings Menu.

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Option	Description	Options	Description
Changeover	0300	0	Manual changeover	1	1-auto changeover	–
Deadband	0310	3	Heating and cooling setpoints can be set no closer than 3°F (1.5°C)	2 thru 9	Heating and cooling setpoints can be set no closer than chosen value: 2-2°F(1°C) 3-3°F(2°C) 4-4°F(2.5°C) 5-5°F(3°C) 6-6°F(3.5°C) 7-7°F(4°C) 8-8°F(4.5°C) 9-9°F (5°C)	Shown only if automatic changeover is selected.
Temperature Indication Scale	0320	0	Temperature is displayed in °F.	1	Temperature is displayed in °C.	–
Daylight Savings	0330	1	Daylight savings enabled (United States).	0	0-daylight savings is disabled.	Set to 0 in areas that do not follow daylight savings.

 

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Option	Description	Options	Description
Remote Temperature Sensor (Outdoor or Indoor)	0340	0	No remote temperature sensor	1-3	1-   outdoor temperature sensor for display only. 2-   outdoor temperature sensor for control. Used for select heat pump systems. (See Special Heat Pump Features section for more details.) 3-   indoor temperature sensor	Defaults and Options depend on System Type selection. Indoor Temperature Sensor uses an averaging network and does not include on-board sensor.   When number 0210 is set to zero, this item is automatically selected to number 2 and not shown.
Heat Pump	0350	0	No compressor	15, 20, 25,	No lockout.	Default depends on
Compressor Lockout or (Balance Point)			lockout.	30, 35, 40, 45	15°F(-9.5°C) 20°F(-6.5°C) 25°F(-4°C) 30°F(-1°C)	other selections. Shown if Outdoor Temperature for control is selected. (See Advanced
					35°F(1.5°C) 40°F(4.5°C)	Features section for more information.)
					45°F (7°C)
Heat Pump	0360	0	No heat pump	40, 45, 50,	No lockout.	Shown if electric is
Auxiliary Lockout			auxiliary lockout	55, 60	40°F(4.5°C) 45°F(7°C) 50°F(10°C)	chosen for backup heat source and outdoor temperature sensor for
					55°F(13°C)	control is selected.
					60°F (15.5°C)	(See Advanced Features section for
						more information.)
Indoor	0380	0	No indoor	1	1-dehumidi-	Available on models
Dehumidifi-			dehumidification		fication droop	with humidity
cation Control			control		control. (See	sensor.
					Advanced Features
					section for more
					information.)

Table 6. Advanced Settings Menu.

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Option	Description	Options	Description
Furnace Filter Change Reminder	0500	0	Furnace filter change reminder off	1-6	1-10 run time days 2-30 run time days 3-60 run time days 4-90 run time days 5-120 run time days 6-365 run time days	Run time based on call for fan.
Humidifier Pad Replace-ment Reminder	0510	0	Humidifier pad replacement reminder off	1-3	1-90 calendar days 2-180 calendar days 3-365 calendar days	–
UV Lamp Replace-ment Reminder	0520	0	UV Lamp replacement reminder off	1	1-365 calendar days	–
Adaptive Intelligent Recovery™	0530	1	Adaptive Intelligent Recovery™ control is activated (system starts early so setpoint is reached by start of program period).	0	0-conventional recovery (system starts recovery at programmed time)	–
Number of Periods	0540	4	Four periods available (Wake, Leave, Return, Sleep)	2	Two periods available (Wake and Sleep)	Not shown if non- programmable is selected. 2 or 4 applies to all days of the week.
Minimum Compressor Off Time	0580	5	Five minute minimum off time for compressor	0, 2, 3, 4	Minimum number of minutes compressor is off between calls for compressor	–
Heat Temperature Range Stop	0600	90	Highest heating setpoint.	40 to 89	Temperature range (1°F increments) of heating setpoint.	Shown in 1/2 °C.
Cool Temperature Range Stop	0610	50	Lowest cooling setpoint.	51 to 99	Temperature range (1°F increments) of cooling setpoint.	Shown in 1/2 °C.
Clock Format	0640	12	12-hour clock format	24	24-hour clock format	–
Extended Fan on time Heat	0650	0	No extended fan operation after call for heat ends	90	Fan operation is extended 90 seconds after call for heat ends.	Not shown if fan operation is set to fossil fuel or in Cool Only Systems
Extended Fan on time Cool	0660	0	No extended fan operation after call for cool ends	90	Fan operation is extended 90 seconds after call for cool ends.	Not shown in Heat Only Systems.

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Option	Description	Options	Description
Keypad Lockout	0670	0	Unlocked keypad	1, 2	1-partially locked keypad	Unlocked-all functions are
					2-fully locked	available.
					keypad	Partially locked-
						only temperature up
						and down keys and
						ability to enter and
						modify Installer
						Setup mode are
						available.
						Fully locked-only
						ability to enter and
						modify Installer
						Setup mode are
						available.
Temperature Control in Heat	0680	2	Standard temperature control in heating	1, 3	1-less aggressive temperature control (could cause temperature undershoot) 3-more aggressive temperature control (could cause temperature overshoot)	Applies to recovery ramp and use of auxiliary heat during recovery.   Choose 1 if getting temperature overshoot.   Choose 3 if getting temperature undershoot.
Temperature Control in Cool	0690	2	Standard temperature control in cooling	1, 3	1-less aggressive temperature control (could cause temperature undershoot) 3-more aggressive temperature control (could cause temperature overshoot)	Applies to recovery ramp.   Choose 1 if getting temperature overshoot.   Choose 3 if getting temperature undershoot.
Temperature Display Offset	0700	0	No difference in displayed temperature and actual room temperature	-3, -2, -1, 0, 1, 2, 3	-3°F(-1.5°C) -2°F(-1°C) -1°F(-.5°C) 0F(0.°C) 1°F(.5°C)	–
					2°F(1°C)
					3°F (1.5°C)
Reset Thermostat	0710	0	No thermostat reset.	1	Resets all Installer Setup Options to default values and resets schedule to default setting.	Only calendar settings and time are retained.

SYSTEM CHECKOUT

Installer System Test
The Installer System Test mode is used to test the HVAC system(s). See Table 7. While in System Test mode, minimum off-time for compressors is bypassed.
The Installer Test is part of the Installer Setup options. Entering the Installer Setup screen and pressing the down arrow key to bring up the test selection(s) accesses it quickly. See Fig. 22.

CAUTION
Equipment Damage Hazard. Minimum compressor off-time is bypassed during Installer System Test. Avoid cycling compressors quickly.

Table 7. System Test(s).

Select	Installer Setup Number	Factory Setting		Other Choices		Comments
		Options	Description	Options	Description
Installer Test Cool	Test 1	0	Cool is off	1,2	0-   cool off 1-   cool stage 1 turns on 2-   cool stages 1 and 2 on	System selection determines which tests are available and the number of stages shown.
Installer Test Fan	Test 2	0	Fan is off	1	0-   fan off 1-   fan turns on
Installer Test Heat	Test 3	0	Heat is off	1-3	0-   heat off 1-   stage 1 heat on 2-   stages 1 and 2 heat on 3-stages 1, 2 and 3 (Aux Ht) on
Installer Test Em Ht	Test 4	0	Emergency heat is off	1	0-   emergency heat off 1-   emergency heat on	Available only if heat pump with auxiliary heat is selected.

Outdoor or Indoor Temperature Sensor
Allow outdoor or indoor temperature sensors to absorb the air for a minimum of five minutes before taking a reading. See the Sensor instructions for more information.

Special Heat Pump Features
Heat Pump with Fossil Fuel Auxiliary Heat (Dual Fuel) and Outdoor Temperature Sensor  In this operation, there is no external fossil fuel kit (dual fuel kit) installed; the thermostat controls this function.

1. Choose the correct heat pump application in Installer Setup Number 0170.
2. Choose Fossil Fuel Option as the backup heat source in Installer Setup Number 0200.
3. Choose No External Fossil Fuel Kit Option is controlling backup heat in Installer Setup Number 0210.
4. Outdoor Temperature Sensor for Control The option is automatically chosen in Installer Setup Number 0340 (0340 is not shown).
5. Choose the appropriate Balance Point Temperature in Installer Setup Number 0350.

OPERATION IN HEAT MODE ABOVE THE BALANCE POINT
(OUTDOOR TEMPERATURE)
When the outdoor temperature is above the selected Balance Point Temperature (ISU 0350), only the compressor operates and the fan (G terminal) energizes
when the thermostat calls for heat.

OPERATION IN HEAT MODE BELOW THE BALANCE POINT
(OUTDOOR TEMPERATURE)
When the outdoor temperature is below the selected Balance Point Temperature (ISU 0350), only the Fossil Fuel (auxiliary heat) operates and the fan (G terminal) does not energize when the thermostat calls for heat.

OPERATION IN EMERGENCY HEAT MODE

The balance point (outside) temperature is not used in the Emergency heat mode. When the thermostat is moved to the Emergency Heat position, the compressor is locked out. The first stage of heat is whatever is connected to the E terminal. The second stage of heat is what is connected to the Aux. terminal. Often there is only one source of non-compressor heat and the E terminal is jumped to the Aux. terminal.

Heat Pump with Electric Auxiliary (Backup) Heat
and Outdoor Temperature Sensor

1. Choose the correct heat pump application in Installer Setup Number 0170.
2. Choose Electric as Auxiliary (Backup) Heat A source in Installer Setup Number 0200.
3. Choose Outdoor Temperature Sensor for Control Option in Installer Setup Number 0340.
4. Choose Compressor Lockout Temperature installer Setup Number 0350.
5. Choose Auxiliary Lockout Temperature installer Setup Number 0360.

NOTE: There is a 5°F deadband between the Compressor and Auxiliary Heat Lockout Temperatures

Operation in Heat Mode
When the outdoor temperature is below the Compressor Lockout Temperature, only the Auxiliary Heat operates. When the outdoor temperature is above the Auxiliary Lockout Temperature, only the Compressor operates. See Fig. 24. Fig. 24. Heat Pump Operation with Lockout Temperatures Set. When the outdoor temperature is between the two temperatures, both the Compressor and Auxiliary Heat operate.

Operation in the Emergency Heat Mode
Once the thermostat is placed into the Emergency Heat mode, the compressor and auxiliary lockout features are turned off. In the Emergency heat mode, the compressor is locked out. The first stage of heat is whatever is connected to the E terminal. The second stage of heat is connected to the Aux. terminal. Usually, the emergency and auxiliary heat sources are electric strip heat in these cases.

Dehumidification Droop Control
The dehumidification control attempts to control to the user’s humidity setpoint by turning on the air conditioner. In extremely high humidity conditions, the thermostat keeps the air conditioner running for up to 3°F below the temperature setpoint. It does this while trying to achieve the desired humidity setpoint and balancing that with the temperature setpoint.

TROUBLESHOOTING (SEE TABLE 8)

Symptom	Possible Cause	Action
Display does not come on.	Thermostat is not being powered.	Check for 24 Vac between C and Rc. Check that AAA batteries are installed correctly and are good.
Temperature settings do not change.	The upper or lower temperature limits were reached.	Check temperature setpoints. Check Installer Setup Numbers 0600 and 0610; modify as needed.
	The keypad is fully locked.	Check Installer Setup Number 0670 to change keypad locked options.
Heating or cooling does not come on.	Thermostat minimum off-time is activated.	Wait up to five minutes for the system to respond.
	System selection is not set to Heat or Cool.	Set system Selection to correct position.
	O/B terminal is not set correctly (Heat Pumps only).	Check Installer Setup Number 0190 and set correctly.
	System type Selection is incorrect.	Check Installer Setup Number 0170 and make sure correct System type is chosen.
Thermostat is calling for Heat (Heat on) or Cool (Cool on) but no heating or cooling is running.	Heating or cooling equipment is not operating.	Check wiring. Check Installer Setup Number 0170 and make sure correct system type is chosen. Verify operation of equipment in System Test mode.
Thermostat does not respond when touch areas are pressed.	The keypad is locked.	Check Installer Setup Number 0670 to change keypad locked options.

Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9

Reference

Download manual:

Honeywell TH8320U Touch Screen Programmable Thermostat Installation Instructions

Honeywell TH8320U Touch Screen Programmable Thermostat Installation Instructions