The T7200, T7300 Thermostats and Q7300 Subbases control 24 Vac commercial single zone heating, ventilating and air conditioning (HVAC) equipment. In addition, the Q7300H Communicating Subbase can communicate schedule information and system instructions to other devices in a LONWORKS® network.
All Models:
T7200D,E Thermostats
Use on single-stage conventional (T7200D) or heat pump (T7200E) applications.
T7300D,E Thermostats:
Use on multistage conventional (T7300D) or heat pump
(T7300E) applications.
Models available with remote sensor capability.
T7300F Thermostats
Q7300 Subbase
| Model | Applications | Subbase Required | Maximum Stages | Wiring Diagram | Changeoverb | |
| Heat | Cool | |||||
| T7200D | Conventional | Nonea | 1 | 1 | 20 | Automatic or Manual |
| T7200E | Heat Pump | Nonea | 1 | 1 | 21 | |
| T7300D | Conventional | Q7300A,G,L | 3 | 3 | 22-23, 28, 34 | |
| T7300E | Heat Pump | Q7300C,D | 3 | 2 | 24-27 | |
| T7300F | Conventional or Heat Pump | Q7300A,C,D,G,L | 3 | 3 | 22-28,34 | |
| Q7300H | 3 | 3 | 29-33 | |||
| Model | Applications | Thermostat Required | Maximum Stagesa,b | Wiring Diagram | |
| Heat | Cool | ||||
| Q7300A | Conventional | T7300D,F | 2 | 2 | 22-23 |
| Q7300C | Heat Pump | T7300E,F | 3 | 2 | 24–26 |
| Q7300D | Heat Pump | T7300E,F | 3 | 2 | 27 |
| Q7300G | Conventional | T7300D,F | 3 | 3 | 28 |
| Q7300Hc | Heat Pump | T7300F | 3 | 2 | 29 |
| Q7300Hd | Heat Pump | T7300F | 3 | 2 | 30 |
| Q7300H | Conventional | T7300F | 3 | 3 | 31 |
| Q7300H | Conventional | T7300F | 2 | 1 | 32 |
| Q7300L | Conventionale | T7300D,F | 2 | 1 | 34 |
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
Electrical Ratings
Batteries: No batteries required.
Auxiliary Heat and Emergency Heat Indication:
Thermostat display indicates when Auxiliary Heat or Emergency Heat are activated.
Loss of Power: The thermostat maintains programmed times and temperatures for the life of the product. The clock and day information is retained for a minimum of two hours.
Light Emitting Diodes (LED):
System Current Draw: 6 VA maximum at 30 Vac, 50/60 Hz.
Output Relay Current Draw: See Table 3
| Relay | Running (A) | Inrush (A) |
| Fan | 0.5 | 2.5 |
| Heat (all stages) | 1.5 | 3.5 |
| Cool (all stages) | 1.5 | 7.5 |
| Auxiliary (Economizer) | 1.5 | 3.5 |
Ratings
Setpoint
| Control | Occupied | Unoccupied |
| Heating | 70°F (21°C) | 55°F (13°C) |
| Cooling | 78°F (26°C) | 90°F (32°C) |
Remote Sensor Wiring Temperature Offset
Temperature offset occurs with 500 ft (157m) to 1000 ft (305m) of 2-wire cable. See Table 5.
Humidity Ratings: 5% to 90% RH, noncondensing.
Clock Accuracy: ±1 minute per month.
| Temperature Range | 18 AWG | 20 AWG | 22 AWG |
| 50 to 90°F | -0.4°F | -0.7°F | -1.0°F |
| 10 to 32°C | -0.3°C | -0.4°C | -0.6°C |
Minimum Stage Operation Time
Mounting Means
Accessories
Approvals:
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 properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control. If you have questions, call Honeywell Customer Response Center at 1-800-468-1502.
When Installing this Product…
Location
T7200 Wallplate or Q7300 Subbase without Remote-Mounted Temperature Sensor
Install the thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature. See Fig. 2.
Q7300 Subbase with Remote-Mounted Temperature Sensor(s)
If only the remote-mounted temperature sensor(s) is used to sense and control room temperature, then install the thermostat in an area that is accessible for setting and adjusting the temperature and settings. If both the subbase and remote-mounted temperature sensor(s) are used to sense and control room temperature, then install the subbase about 5 ft above the floor in an area with good air circulation. Install the remote-mounted sensor(s) about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature. See Fig. 2. If multiple remote sensors are required, they must be arranged in a temperature averaging network consisting of two, three, four, five or nine sensors.
NOTES:
Mounting Subbase/Wallplate
The subbase/wallplate mounts horizontally on the wall or a 2 in. by 4 in. wiring box. Position the subbase/wallplate horizontally on the wall or on a 2 in. by 4 in. wiring box.
WIRING SUBBASE/WALLPLATE
CAUTION
IMPORTANT
| Terminal Designations | Typical Connection | Function | Terminal Type | |
| Standard | Alternate | |||
| A1 | A2a | Dry auxiliary contacts for economizer control; A1 is normally open during Unoccupied periods and closed during Occupied periods. | Output | Dry contact |
| A1, A2 | — | Damper control relay (Q7300L only). | Input, Output | 24V powered contact |
| A2 | A1a | Dry auxiliary contacts for economizer control (A2 is common). | Input | Dry contact |
| A3 | — | Dry auxiliary contacts for economizer control; A3 is normally open during Occupied periods and closed during Unoccupied periods. | Output | Dry contact |
| AS, AS | — | C7150B Discharge Air Sensor connection. | Input | — |
| B | — | Heating changeover valve. | Output | 24V powered contact |
| C1, C2, C3, C4, C5 | — | Communication input for T7147. | Input | Low power |
| E | K | Emergency heat relay. | Output | 24V powered contact |
| Terminal Designations | Typical Connection | Function | Terminal Type | |
| Standard | Alternate | |||
| EB, EB | — | Q7300H LONWORKS® bus connection to LONWORKS® network. | Input, Output | Communi- cations |
| G | F | Fan relay. | Output | 24V powered contact |
| O | R | Cooling changeover valve. | Output | 24V powered contact |
| R | V | 24V system transformer. | Input | — |
| RC | — | 24V cooling transformer. | Input | — |
| RH | — | 24V heating transformer. | Input | — |
| T, T | — | Remote sensor input for T7047 or T7147. | Input | — |
| W1 | H1, R3 | Stage 1 heating relay (Q7300A,G,H) or auxiliary heat relay (Q7300C,D,H). | Output | 24V powered contact |
| W2 | H2, R4, W3, Y | Stage 2 heating relay. | Output | 24V powered contact |
| W3 | — | Stage 3 heating relay. | Output | 24V powered contact |
| X | Bb, C, X1, X2 | Common. | Input | |
| X1, X3 | A, A1, A2, C, L, X, Z | User defined Light Emitting Diodes (LED). | Annunciation | — |
| X4 | — | LED common. | Annunciation | — |
| Y1 | C1, M, Y | Stage 1 compressor contactor (Q7300C,D,H). | Output | 24V powered contact |
| Y1, Y | RS, M | Stage 1 cooling compressor (Q7300A,G,Hc,L). | Output | 24V powered contact |
| Y2 | C2 | Stage 2 cooling compressor (conventional). Stage 2 compressor contactor (heat pump). | Output | 24V powered contact |
| Y3 | — | Stage 3 cooling compressor. | Output | 24V powered contact |
| BM | — | ML7984 Actuator connection (Q7300Hc, L only); no call for heat, valve closed; call for stage 1 heat, valve approximately one-half open; call for stage 2 heat, valve fully open. | Output | — |
| FC | — | Fan control transformer (Q7300Hc, L only). | Input | — |
| GH | — | High-speed fan output (Q7300Hc, L only); activate during calls for cooling. | Output | 24V powered contact |
| GL | — | Low-speed fan output (Q7300Hc, L only); activated on calls for heat and fan On selection. | Output | 24V powered contact |
| P1, P2 | — | Pump interlock relay (Q7300Hc, L only); operates circulator pump in hydronic heat or energizes conventional heat system. | Input, Output | 24V powered contact |
| RM | — | ML7984A Actuator connection (Q7300Hc, L only); no call for heat, valve closed; call for stage 1 heat, valve approximately one-half open; call for stage 2 heat, valve fully open. | Output | — |
| — | C, H, L | HSII Control Panel. | — | — |
| — | O | Momentary circuit changeover. | — | — |
| — | P | Defrost. | — | — |
| — | R1, R2 | Low- and high-speed fan relays. | — | — |
| — | T | External temperature readout, T-relay; outdoor thermistor. | — | — |
Mounting Thermostat on Subbase/Wallplate
The thermostat mounts on the subbase/wallplate after it is installed:
ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE
Using Thermostat Keys
The thermostat keys are used to:
Setting System and Fan (select models)
The system’s default setting is Heat. The fan default is set so the fan operates continuously in Occupied periods, Unoccupied period recovery times and with the heating and cooling equipment in Unoccupied periods. Use the System and Fan keys to change the settings. Fan and system operation are configured in the Installer Setup options.
The system settings are:
The fan settings are:
Occupied periods:
Setting Temperature
Refer to Table 4 for the default temperature setpoints. See Programming section for complete instructions on changing the setpoint
The installer uses the Installer Setup to customize the thermostat to specific systems. (See Table 7.) The table includes all the configuration options available. A combination of key presses are required to use the Installer
Setup feature:
|
Select | Installer Setup Number (PressUnoccupie Temp to change) | Factory Setting | Other Choices (Press .A or T to change) | Actual Setting | ||
| d Display | Description | Display | Description | |||
| Not used | 1 | — | — | — | — | — |
| Fan operationa | 2 | 0 | Conventional applications where equipment controls fan operation in heat mode. | 1 | Electric heat applications where thermosta controls fan operation in heat mode. | t |
| Output stages of heating | 3 | Subbase dependant | Stages of heat. | 0, 1, 2, or 3 | 0: No heating. 1: One stage of heat. | |
| 2: Two stages of heat. | ||||||
| 3: Three stages of heat. | ||||||
| Heating cycle rate | 4 | 4 | Stage 1: 4 cph. | 3, 6, 8o 9 | 3r : 3 cph (hot water systems or high efficiency furnaces). 6: 6 cph (conventional systems). 8: 8 cph (conventional systems). 9: 9 cph (electric heat systems). | |
| 5 | 4 | Stage 2: 4 cph. | ||||
| 6 | 4 | Stage 3: 4 cph. | ||||
| 7 | 4 | Emergency heat relay is on continuously. Highest stage of heat cycles at 4 cph(Q7300Cor only). | D | |||
| Cooling output stages | 8 | Subbase dependant | Stages of cooling. | 0, 1, 2or 3 | 0: No cooling. 1: One cooling stage. 2: Two cooling stages. | |
| 3: Three cooling stages. | ||||||
| Cooling cycle rate | 9 | 4 | Stage 1: 4 cph. | 3 | 3: 3 cph. | |
| 10 | 4 | Stage 2: 4 cph. | ||||
| 11 | 4 | Stage 3: 4 cph. | ||||
| System setting | 12 | Model | System selection. | 0, 1 or | 2 0: System setting key is operational. 1: Auto setting disabled. 2: Auto only setting. | |
| adjustment | dependant | |||||
| (models with | ||||||
| System key) | ||||||
| Not used | 13 | — | — | — | — | — |
| Degree temperature display | 14 | 0 | Temperature displayed in °F. | 1 | Temperature displayed in °C. | |
| Displaying temperature (T7300F only). | 15 | 0 | Temperature displayed. | 1 | Temperature not displayed. | |
| Clock format. | 16 | 0 | 12-hour clock format. | 1 | 24-hour clock format. | |
| Intelligent Fan™ operation. | 17 | 2 | Fan operates continuously in Occupied and recovery modes. Fan operates with call for heat or cool in Unoccupied mode. | 0 or 1 | 0: Fan operates only with call for heat or cool (Occupied and Unoccupied modes 1: Fan operates continuously in Occupied mode. Fan operates with call for heat or cool in Unoccupied mode. | ). |
| Auxiliary contact operation. | 18 | 0 | 0: Time of day contact. | 1 | 1: Economizer contacts. | — |
|
Select | Installer Setup Number (PressUnoccupie Temp to change) | Factory Setting | Other Choices (Press .A or T to change) | Actual Setting | ||
| d Display | Description | Display | Description | |||
| Extended fan operation in heaat (T7300F only). | 19 | 0 | No extended fan operation after call for heat ends. | 1 | Fan operation extended 90 sec after call fo heat ends. | r |
| Extended fan | 20 | 0 | No extended fan operation after | 1 | Fan operation is extended 90 seconds afte | r |
| operation in | the call for cooling ends. | the call for cooling ends. | ||||
| cooling | ||||||
| (T7300F only). | ||||||
| Fan key adjustment (models with Fan key). | 21 | 0 | Fan setting key operational. | 1 | Fan setting key is Auto only. | |
| Remote sensing. | 22 | 0 | Remote sensing not activated. | 1 | Remote sensing activated. | |
| Temperature averagingnetworkb (T7300F only). | 23 | 0 | Temperature averaging disabled. | 1 | Temperature averaging between local sensor and remote sensor(s) activated. | |
| Not used. | 24 | — | — | — | — | — |
| Keypad lockout level (keypad lockout enabled/ disabled by DIP switch 1 on thermostat back). (T7300F only) | 25 | 0 | No lockout. | 1, 2 or 3 | 1: Lockout all thermostat keys except system and fan settings, temporary setpoint, clock and day adjustments, increase.A and decreaseT. 2: Lockout all keys except Set Current Da Time, increase.A and decreaseT. 3: Lockout all keys except Temporary Occupied and Set Current Day/Time (fo clock, day adjustment). |
y/ |
| r | ||||||
| Duration of temporary override. | 26 | 3 | 3: Three hour override. | 1, 8 or 12 | 1: One hour override. 8: Eight hour override. 12: Twelve hour override. | |
| Not used. | 27 through 29 | — | — | — | — | — |
| Deadband (T7300F only). | 30 | 2 | Heating and cooling setpoints ca be set no closer than 2°F (1.1°C). | n3 – 10 | Heating and cooling setpoints can be set no closer than the chosen value. | |
| Interstage control point (T7300F, Q7300C,D only). | 31 | 0 | Disabled. | 1 – 12 | Temperature must change more than chosen value before system calls for next stage. (Example: heat setpoint: 68°F (20°C interstage setting: 2°F (1.1°C), temperatur is 65.5°F (18.5°C). Second stage turns on, brings temperature to 66°F (19°C) and turn off. Heat pump continues torununtil setpoin is reached. | ), e |
| s t | ||||||
| Minimum on- time (T7300F). | 32 | 2 | 2-minuteminimum on- time for heating and cooling. | 0 or 1 | Nominimum on-time or 1-minute minimum on-time for heating and cooling. | |
| Minimum compressor off- time. | 33 | 4 | 4-minuteminimumcompressor off-time. | 0, 1, 2, 3 or 5 | Minimum number of minutes (0 through 5) compressor is off between compressor cal | s. |
| Temperature heat range stops (T7300F). | 34 | 90 | Highest heat setpoint. | 40 to 89 | Heat setpoint temperature range (1°F increments). | |
| Temperature cooling range stops (T7300F). | 35 | 45 | Lowest cooling setpoint. | 46 to 99 | Temperature range (1°F increments) for cooling setpoint. | |
| Not used. | 36 | — | — | — | — | — |
|
Select | Installer Setup Number (PressUnoccupie Temp to change) | Factory Setting | Other Choices (Press .A or T to change) | Actual Setting | ||
| d Display | Description | Display | Description | |||
| Temperature display adjustment. | 37 | 0 | No difference in displayed temperature and actual room temperature. | 1 – 6 | 1: Display adjusts to 1°F (0.6°C) higher than actual room temperature. 2: Display adjusts to 2°F (1.1°C) higher than actual room temperature. 3: Display adjusts to 3°F (1.7°C) higher than actual room temperature. 4: Displayadjusts to 1°F (0.6°C) lower tha actual room temperature. 5: Displayadjusts to 2°F (1.1°C) lower tha actual room temperature. 6: Displayadjusts to 3°F (1.7°C) lower tha actual room temperature. |
n n n |
| Minimum off-time in heating. | 38 | 4 | 4: 4-minuteminimumoff-time | 0, 1, 2, 3, or 5 | Minimum number of minutes (0 through 5) the heating equipment is off between calls for heat. | |
| Not used. | 39 | — | — | — | — | — |
| Installer Setup lockout (enable/ disable keypad lockout using DIP switch 1 on thermostat back). | 40 | 0 | 0: No Installer Setup lockout. | 1 | 1: Installer Setup lockout activated. | |
Setting Current Time/Day
INSTALLER SYSTEM TEST
Use the Installer System Test to check the thermostat configurations and operation. Refer to Table 8 for a list of available system tests. To start the system test:
CAUTION
| Test Number | System Test Description |
| 10 to 19 | Heating equipment can be turned on and off. |
| 20 to 29 | Emergency heat equipment can be turned on and off (Q7300C,D,H only). |
| 30 to 39 | Cooling equipment can be turned on and off. |
| 40 to 49 | Fan equipment can be turned on and off. |
| 60 0 to 60 19 | Keyboard keys test. |
| 70 to 79 | Thermostat information including date code and software versions are displayed. |
Thermostat Information
| Key to Press | Test Number | Description |
| Heating Equipment System Test | ||
| Heat/Cool Settings | 10 | Enter heating equipment system test. |
| .A | 11 | Stage-one heat turns on. The system fan is also energized. |
| .A | 12 | Stage-two heat turns on. Stage-one heat and system fan remain on. |
| .A | 13 | Stage-three heat turns on. Stage-one and stage-two heat with the system fan are on. |
| T | 12 | Stage-three heat turns off. |
| T | 11 | Stage-two heat turns off. |
| T | 10 | Stage-one heat and system fan turn off. |
| Emergency Heating Equipment System Test (T7300E,F with Q7300C,D) | ||
| Heat/Cool Settings | 20 | Change from heating to emergency heating equipment system test (Em Heat on). |
| .A | 21 | Fan turns on. |
| T | 20 | Fan and highest stage heat turns off. |
| Cooling Equipment System Test | ||
| Heat/Cool Settings | 30 | Change from heating or emergency heating to cooling equipment system test. |
| .A | 31 | Stage-one cooling and system fan turn on. |
| .A | 32 | Stage-two cool turn on. Stage-one cool and system fan remain on. |
| .A | 33 | Stage-three cool turns on (Q7300G,H only). Stage-one and stage-two cool with system fan remain on. |
| T | 32 | Stage-three cool turns off. |
| T | 31 | Stage-two cool turns off. |
| T | 30 | Stage-one cool and system fan turn off. |
| Fan Equipment System Test | ||
| Heat/Cool Settings | 40 | Change from cooling to fan equipment system test. |
| .A | 41 | Fan turns on. |
| .A | 42 | High speed fan turns on (Q7300Ha, L only). |
| T | 41 | High speed fan turns off. |
| T | 40 | Fan turns off. |
| Key Operation System Test | ||
| Heat/Cool Settings | 60 2 | Change from fan to key operation system test. |
| Unoccupied Temp | 60 0 | Unoccupied Temp test number is displayed. |
| Occupied Temp | 60 1 | Occupied Temp test number is displayed. |
| .A | 60 3 | Increase test number is displayed. |
| T | 60 5 | Decrease test number is displayed. |
| Clear Start Time | 60 7 | Clear Start Time test number is displayed. |
| Day | 60 8 | Day test number is displayed. |
| Copy | 60 9 | Copy test number is displayed. |
| Unoccupied Start TIme | 60 10 | Unoccupied Start Time test number is displayed. |
| System (select models) | 60 11 | System test number is displayed. |
| Fan (select models) | 60 12 | Fan test number is displayed. |
| Set Current Day/Time | 60 14 | Set Current Day/Time test number is displayed. |
| Run Program | 60 15 | Run Program test number is displayed. |
| Temporary Occupied | 60 16 | Temporary Occupied test number is displayed. |
| Occupied Start Time | 60 17 | Occupied Start Time test number is displayed. |
| Continuous Unoccupied | 60 19 | Continuous Unoccupied test number is displayed. |
Setting Keypad Lockout Switch (T7300 only)
The DIP switch 1, on the thermostat back, activates the lockout features. The switch must be set ON (up) to activate the lockout feature
If keypad lockout is desired:
The thermostat operates at the Unoccupied temperature setting unless the thermostat is programmed. Table 10 shows the default temperature settings. (The program has four):
| Control | Occupied | Unoccupied |
| Heating | 70°F (21°C) | 55°F (13°C) |
| Cooling | 78°F (26°C) | 90°F (32°C) |
The keyboard is located behind the thermostat cover. Up to sixteen keys are used to set, review and modify programmed times and temperature settings. The thermostat display shows day, time, program period and temperature. The thermostat can be set for two Occupied and two Unoccupied times for each day of the week (28 independent time settings). Temporary Occupied key provides quick temporary temperature changes for increased occupant comfort. The Continuous Unoccupied key provides energy efficient operation for extended periods of time.
| Day | Occupied Period 1 | Unoccupied Period 1 | Occupied Period 2 | Unoccupied Period 2 |
| Monday | ||||
| Tuesday | ||||
| Wednesday | ||||
| Thursday | ||||
| Friday | ||||
| Saturday | ||||
| Sunday |
IMPORTANT To program the thermostat, 24 Vac is required (turn on system power). The keyboard lockout feature must be disabled by setting the DIP switch 1 on the back of the thermostat to the Off position.
Setting Current Day/Time
Setting Program Times
Copying a Day
Setting Program Temperature Setpoints
Clearing Program Start Times
Temporary Occupied Override
Using Temporary Override
Using Continuous Unoccupied
Changing Temperature Setpoint Until Next Program Period
T7200/T7300 Relay Logic
The T7200/T7300 contains three switching relays. In conventional applications, the relays control first stage cooling, first stage heating, and fan. In heat pump applications, the relays control the heat pump compressor, auxiliary heat, and the fan. Because of this change in switching logic, it is important to use a Q7300C,D, Q7300H2003, or Q7300H2011 Subbase when the T7300 is set for heat pump applications and a Q7300A,G, Q7300H2029 Subbase when the T7300 is set for conventional applications.
P+I Control
The T7200/T7300 microprocessor based control requires that the user understands temperature control and thermostat performance. A conventional electromechanical 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 electromechanical 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 electromechanical thermostats.
Equipment Protection
As part of the operational sequence, the T7200/T7300 microprocessor also incorporates minimum on and off times for all heating and cooling stages. Minimum on time is set in the installer setup number 32. Using the minimum on and off times assures that rapid cycling of equipment does not occur, which extends equipment life. Minimum on and off times are set in the Installer Setup.3
Startup
When power to the thermostat is turned on, a startup and initialization program begins. The startup occurs only on initial powerup. After total loss of power for an extended period, the current time and day may need to be set, but the user program is held. The initial default values are heating 68°F (20°C) and cooling 78°F (26°C) for the Occupied periods. Unoccupied default values are heating 55°F (13°C) and cooling 90°F (32°C).
Occupied Operation
When the thermostat is operating in the Occupied period, the temperature is controlled to the occupied heat or cool setpoint. The normally open (A1) auxiliary relay contacts are closed and the normally closed (A3) auxiliary relay contacts are opened during the Occupied periods (if the subbase being used has this option). The fan operates as follows: fan selection can be set to On (always energized) or Auto (cycles with Y1 or W1).
Unoccupied Operation
When the thermostat is operating in the Unoccupied period, the temperature is controlled to the Unoccupied heat or cool setpoint. The normally open (A1) relay contact is open and the normally closed (A3) relay contact is closed. The fan operates as follows: fan is always intermittent (cycles with Y1 or W1).
Intelligent Recovery® Feature
Intelligent Recovery is a Honeywell trademarked feature for the way the thermostat controls heating and cooling equipment during recovery from the Unoccupied to Occupied setting. During recovery, the control point changes gradually rather than shifting immediately from the energy saving setting to the comfort setting. When Intelligent Recovery is used in heating, the control point raises gradually, maximizing the use of the more economical first stage heat to bring the sensed temperature to the desired comfort setpoint. This minimizes using the typically more expensive second-stage heat. Advantages of Intelligent Recovery are:
RECOVERY FROM UNOCCUPIED
The heat pump heat recovery ramp is 3°F (1.6°C) per hour. This differs from the 5°F (2.8°C) per hour for conventional systems. The 3°F helps the system use the economical heat pump more and the expensive auxiliary heat less. The cooling ramp is 5°F, the same as for conventional systems
Conventional System
The T7200 and T7300D,F Thermostats with Q7300A,G,H Subbases are designed for conventional heat/cool applications.
Heat Pump Operation
The T7200E and T7300E,F Thermostats with Q7300C,D,H Subbases are designed for heat pump applications. Additional information is required when configured for heat pump applications.
O AND B TERMINALS FOR HEATING OR COOLING CHANGEOVER
The Q7300C controls heat pump changeover. The Q7300D,H is only used in a heat pump application when the heat pump controls the reversing valve changeover. See Table 12 for the operation of the O and B terminals on the Q7300C, H2003.
O AND B TERMINALS ON A CONVENTIONAL SUBBASE
Conventional subbase O and B terminals can be used to drive dampers and valves. The O terminal is energized on a call for cool and the B terminal is energized on a call for heat.
| System Selection | O Terminal | B Terminal |
| Heat | Open | Closed |
| Cool | Closed | Open |
| Auto (Heat)a | Open | Closed |
| Auto (Cool)b | Closed | Open |
| Emergency Heat | Open | Closed |
| Off | c | c |
FAN OPERATION
When the fan is set to On, the fan is energized continuously in the Occupied period. The Auto setting energizes the fan with the heating or cooling system. If the subbase is Q7300D, the fan cycles with Y1 and W1 during Unoccupied period.
EMERGENCY HEAT (SELECT T7300 THERMOSTATS ONLY)
With the system set for Em Heat, auxiliary heat serves as stage one; compressor stages are locked off. The fan cycles with the auxiliary heat.
COMMUNICATING SUBBASE
Select T7300F Thermostats with the Q7300H Communicating Subbase are designed for conventional or heat pump applications in a LonWorks® network. The Q7300H Subbase allows remote access and the sharing of clock, schedule, setpoints, bypass and other system parameters in a LONWORKS® network. See Fig. 33 for a T7300F/Q7300H wiring layout in a LONWORKS® network.
Cycle Rates
The thermostat control algorithm maintains the temperature by cycling stages of heating or cooling to meet setpoint.
Subbase Auxiliary Relay
The Q7300 Auxiliary Relay output acts as a time-of-day switch to be used with an economizer minimum position control. The normally open (A1) auxiliary relay contacts are closed during the Occupied period and open during the Unoccupied period. The normally closed (A3) auxiliary relay contacts are open during the Occupied period and closed during the Unoccupied period. The contacts are in the normal state during recovery.
Interfacing with Electromechanical Economizers (Subbases with Auxiliary Relay)
Mechanical cooling is often used when outside temperatures are in the 50°F (10°C) to 60°F (16°C) range and humidity is below 50 percent. In central and northern climates, hundreds of hours fall into this temperature category. By permitting 80 to 100 percent outside air into the system, mechanical cooling may not be needed at all, particularly during Spring and Fall. An economizer is used to take advantage of the outside air. The typical economizer consists of an outside air damper, motor, outdoor air changeover control and a minimum position potentiometer. The motor controls the dampers. Suitability of the outside air for cooling is determined by the outdoor air changeover control. The potentiometer is used for adjusting the minimum position of the economizer dampers, which provide a minimum amount of fresh air for ventilation. The economizer reduces compressor run time, thereby saving energy and extending the compressor life. The drawback to using the economizer is that during the Unoccupied period, if there is no call for cool or outdoor air is not suitable for free cooling, the economizer is controlled to minimum position. This position allows some percentage of outdoor air to enter the building, regardless of air suitability. The situation can cause the heating or cooling to run more often than if suitable outdoor air is permitted to enter the building. The thermostat can take advantage of an economizer by connecting the subbase auxiliary relay contacts (A1 and A2) to control the economizer minimum position potentiometer. The contacts close during the Occupied period, allowing the economizer to operate normally. The contacts open during the Unoccupied period, disabling the minimum position feature of the economizer. The open contacts cause the economizer to drive dampers fully closed instead of staying at minimum open position. This reduces the possibility of unsuitable outdoor air from entering the building, which lowers the internal load on the HVAC system and saves additional energy.
Other Uses for the Auxiliary Relay
Examples of other uses of the auxiliary relay are hot water heaters, lighting or baseboard heat. The additional loads are connected to the auxiliary relay contacts on the subbase. The contacts are rated for 1.6A at 30 Vac, but can be adapted to higher current applications with the use of an external relay and transformer.
| Symptom | Possible Cause | Action |
| Display will not come on. | Thermostat is not being powered. | • Check that X terminal is connected to the system transformer. • Check for 24 Vac between X and R or RH terminals. — If missing 24 Vac: — check if the circuit breaker is tripped; if so, reset the circuit breaker. — check if the system fuse is blown; if so, replace the fuse. — check if the HVAC equipment power switch on the is in the Off position; if so, set to the On position. — check wiring between thermostat and HVAC equipment and replace any broken wires and tighten any loose connections. — If 24 Vac is present, proceed with troubleshooting. |
| Temperature display is incorrect. | Room temperature display has been reconfigured. | Enter Installer Setup number 37 and reconfigure the display. |
| Thermostat is configured for °F or °C display. | Enter Installer Setup number 14 and reconfigure the display. | |
| Bad thermostat location. | Relocate the thermostat. | |
| Display shows two dashes and a degree sign. | Installer Setup 22 is set for remote sensing and the sensor is missing or the circuit is open or shorted. | |
| Temperature settings will not change. (Example: Cannot set heating higher or cooling lower.) | Upper or lower temperature limits were reached. | Check the temperature setpoints: • Heating limits are 40 to 90°F (7 to 31°C) • Cooling limits are 45 to 99°F (9 to 37°C) |
| The setpoint temperature range stops were configured. | Check Installer Setup number 34 and 35 and reconfigure the setpoint stops. | |
| Keypad is locked. When a locked key is pressed, LOC flashes on the LCD. | • Reset DIP switch 1 on back of thermostat to enable keypad. • Enter Installer Setup number 25 or 40 and reconfigure keypad lockout level. | |
| Unable to configure Installer Setup | Installer Setup is locked out. | Reset the DIP switch 1 on back of thermostat to enable keypad. |
| Symptom | Possible Cause | Action |
| Temperature settings change from original setting. | Trying to set heat and cooling setpoints too close together. Automatic changeover thermostat models have a deadband. Example: cool setpoint: 72, deadband: 3, heat setpoint: 68; changing heat setpoint to 70 automatically changes cool setpoint to 73. | • Check that the heating setpoint is lower than the cooling setpoint. • Check Installer Setup number 30 to identify the deadband between heating and cooling setpoints. Reconfigure if desired. |
| Room temperature is out of control. | Remote temperature sensing is not working. | Checkout all remote sensors. |
| Heating will not come on. | No power to the thermostat. | • Check that X terminal is connected to the system transformer. • Check for 24 Vac between X and R or RH terminals. — If missing 24 Vac: — check if the circuit breaker is tripped; if so, reset the circuit breaker. — check if the system fuse is blown; if so, replace the fuse. — check if the HVAC equipment power switch on the is in the Off position; if so, set to the On position. — check wiring between thermostat and HVAC equipment and replace any broken wires and tighten any loose connections. — If 24 Vac is present, proceed with troubleshooting. |
| Heating will not come on (Continued). | Thermostat minimum off time is activated and wait indicator is displayed. | • Wait up to five minutes for the system to respond. • Enter Installer Setup number 38. Reconfigure minimum off time (if required). |
| System selection is not set to Heat. | Set system selection to Heat. | |
| Cooling will not come on. | No power to the thermostat. | • Check that X terminal is connected to the system transformer. • Check for 24 Vac between X and R or RC terminals. — If missing 24 Vac: — check if the circuit breaker is tripped; if so, reset the circuit breaker. — check if the system fuse is blown; if so, replace the fuse. — check if the HVAC equipment power switch on the is in the Off position; if so, set to the On position. — check wiring between thermostat and HVAC equipment and replace any broken wires and tighten any loose connections. — If 24 Vac is present, proceed with troubleshooting. |
| Thermostat minimum off time is activated and wait indicator is displayed. | • Wait up to five minutes for the system to respond. • Enter Installer Setup number 33. Reconfigure minimum off- time (if required). | |
| System selection is not set to Cool. | Set system selection to Cool. | |
| System on indicator (flame: heat, snowflake: cool) is displayed, but no warm or cool air is coming from the registers. | Conventional heating equipment turns on the fan only once the furnace has warmed up to a setpoint. | Wait one minute after seeing the on indicator and then check the registers. |
| Heating or cooling equipment is not operating. | Verify operation of heating or cooling equipment in self- test. |
CROSS-REFERENCE
All T7300/Q7300 Series 2000 models are different from the existing T7300/Q7300 T8611 and T8621 devices as summarized in Table 14.
| Feature/Function | Present T7300/Q7300, T8611, T8621 Families | T7300/Q7300 Series 2000 Family |
| System switching | Mechanical switch on Q7300 subbase. | Keyboard entry on T7300 thermostat. |
| Fan switching | Mechanical switch on Q7300 subbase. | Keyboard entry on T7300 thermostat. |
| Installer configuration | Field settings made via DIP switches on the back of the thermostat and subbase. | Field settings made through the T7300 thermostat keyboard. |
| Device color | Beige or Premier White®. | Taupe or Premier White®. |
| Model Number | Figure Number | Description | Trade Replacement | Remarks |
| T7200D2008 | 19 | Honeywell logo; no system or fan settings. | T7200D2008 | Direct replacement for T7200A Thermostats. |
| T7200E | One-stage heat and one-stage cool heat pump thermostat. | |||
| T7200E2005 | 20 | Honeywell logo; no system or fan settings. | T7200E200 | 5 Direct replacement for T7200B Thermostats. |
| T7300D | Multistage conventional thermostat used with Q7300A,G, or L Subbase. | |||
| T7300D2007 | Refer to subbase | Honeywell logo; TRADELINE®model; remote sensor capability; system settings: Heat-Off-Cool-Auto; taupe color. | T7300D2007 | Direct replacement for T8621 Thermostats. |
| T7300E | Multistage heat pump thermostat used with Q7300C or D Subbase. | |||
| T7300E2020 | Refer to subbase | Honeywell logo; TRADELINE®model; remote sensor capability; system settings: EmHeat-Heat-Off-Cool-Auto; taupe color. | T7300E2020 | Direct replacement for T8611M Thermostats. |
| T7300F | Multistage thermostat for heat pump (Q7300C or D Subbase) and conventional (Q7300A,G or L Subbase) applications. | |||
| T7300F2002 | Refer to subbase | Honeywell logo; SUPER TRADELINE® model; remote sensor and discharge air sensor capability; no system or fan settings; taupe col | T7300F2002 or. | |
| T7300F2010 | Refer to subbase | Honeywell logo; SUPER TRADELINE® model; remote sensor and discharge air sensor capability; system settings: configurable; fan settings: Auto-On; taupe color. | T7300F2010 | |
HONEY WELL
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