Honeywell Thermostat T7351F2010 Instructions Manual - Honeywell Thermostat Manual Download

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Sunday, April 5, 2020

Honeywell Thermostat T7351F2010 Instructions Manual

T7351 Commercial Programmable Thermostat FOR SINGLE- OR MULTI-STAGE CONVENTIONAL/HEAT PUMP SYSTEMS INSTALLATION INSTRUCTIONS APPLICATION — concealed pipes and chimneys. — unheated (uncooled) areas such as an outside wall The T7351 Commercial Programmable Thermostat behind the thermostat. controls 24 Vac commercial single zone heating, ventilating and air conditioning (HVAC) equipment. The IMPORTANT T7351 consists of a thermostat and subbase. The To avoid electrical interference, which can thermostat includes the display and keypad for 7-day cause erratic performances, keep wiring runs as programming. The subbase includes equipment control short as possible and do not run thermostat connections. The subbase mounts on the wall and the wires adjacent to the line voltage electrical dis- thermostat mounts to the subbase. tribution systems. Use shielded cable. The cable shield must be grounded only at the con- trolled equipment case. MERCURY NOTICE Subbase If this control is replacing a control that contains mercury in a sealed tube, do not place your old WHEN USED TO SENSE ROOM TEMPERATURE control in the trash. Dispose of properly. Install the thermostat about 5 ft. (1.5m) above the floor in an area with good air circulation at average temperature. Contact your local waste management authority (See Fig. 1.) for instructions regarding recycling and the proper disposal of an old control. If you have WHEN NOT USED TO SENSE ROOM TEMPERATURE questions, call Honeywell Customer Care Center When using the remote-mounted temperature (and at 1-800-468-1502. humidity) sensor(s) to sense ambient conditions, install the thermostat in an area that is accessible for setting INSTALLATION and adjusting the temperature and settings. Install the remote-mounted sensor(s) about 5 ft. (1.5m) When Installing this Product... above the floor in an area with good air circulation at 1. Read these instructions carefully. Failure to follow average temperature (See Fig. 1). them could damage the product or cause a hazard- If multiple remote sensors are required, they must be ous condition. arranged in a temperature averaging network consisting 2. Check ratings given in instructions and on the of four sensors (See Fig. 2). product to ensure the product is suitable for your application. NOTE: Only TR21 models with no setpoint adjustment 3. Installer must be a trained, experienced service can be used for temperature averaging. technician. 4. After installation is complete, check out product operation as provided in these instructions. YES NO CAUTION NO Electrical Shock or Equipment Damage NO 5 FEET Hazard. Can shock individuals or short (1.5 METERS) equipment circuitry. Disconnect power supply before installation. Location M4823A Do not install the thermostat where it can be affected by: — drafts, or dead spots behind doors and in corners. Fig. 1. Typical location of thermostat or — hot or cold air from ducts. remote-mounted sensor. — radiant heat from sun or appliances. Place Bar Code Here 62-0258-05 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Mounting Subbase The subbase mounts horizontally. IMPORTANT WIRES THROUGH WALL • When using the internal temperature or humidity MOUNTING sensor, the device must be mounted horizontally HOLES (with the LCD facing upwards). Precise leveling is not needed. • When using remote room temperature and humidity sensors, thermostat mounting orienta- tion does not matter. Wall mounting (using standard drywall screws) is WALL standard. Mounting to a 2 in. by 4 in. (50.8 mm by 101.6 ANCHORS mm) wiring box can be accomplished: (2) — for a horizontal box, no extra hardware is required. — for a vertical box, part 209651A is required. — Mount to European standard wall box (having 2.4 in. (60.3 mm) between mounting screws in a horizontal MOUNTING SCREWS line) with or without adaptive hardware. M19608 1. Position and level the subbase. NOTE: A level wallplate is only for appearance. Fig. 3. Mounting the subbase. The thermostat functions properly when not level. Mounting Thermostat on Subbase (Fig. 2. Use a pencil to mark the mounting holes. (See 4) Fig. 3). With the subbase installed, mount the thermostat: 3. Remove the subbase from the wall and drill two 3/ 1. Engage top subbase tabs into the thermostat top. 16 in. (4.8 mm) holes in the wall (if drywall) as 2. Swing the thermostat down. marked. For firmer material such as plaster or 3. Press the lower edge of the case to latch. wood, drill two 7/32 in. (5.6 mm) holes. 4. Gently tap anchors (provided) into the drilled holes NOTE: To remove the thermostat from the wall, first pull until flush with the wall. out at the bottom of the thermostat; then remove 5. Position the subbase over the holes, pulling wires the top. through the wiring opening. 6. Loosely insert the mounting screws into the holes. A. ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE. 7. Tighten mounting screws. SUBBASE T4 T3 TR21 TR21 TT TT TR21 TR21 TT TT B. PRESS LOWER EDGE OF CASE TO LATCH. M29184 Fig. 2. Four TR21 Sensors providing temperature averaging network for T7351 Thermostat. M19609 Fig. 4. Mounting thermostat on subbase. 62-0258—05 2 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Wiring Setting Temperature Follow equipment manufacturer wiring instructions when Refer to Table 2 for the default temperature setpoints. To available. Refer to the Wiring Diagram section for typical set the Occupied and Not Occupied Heat and Cool hookups. A letter code is located near each terminal for setpoints, simply press the Heat and Cool button under identification. the Occupied or Not Occupied area of the keypad. To set the Standby Heat setpoint, press both the Occupied and IMPORTANT Not Occupied Heat buttons simultaneous. To set the All wiring must comply with local electrical codes Standby Cool setpoint, press the Occupied Cool and Not and ordinances. Occupied Heat buttons simultaneously. NOTE: Maximum (and recommended) wire size is 18- Setting System and Fan gauge. Do not use wire smaller than 22-gauge. System default setting is Auto. Fan default setting is On. 1. Loosen subbase terminal screws and connect sys- NOTE: Use System and Fan keys to change settings. tem wires. 2. Securely tighten each terminal screw. 3. Push excess wire back into the hole in the wall. System Settings 4. Plug the hole with nonflammable insulation to pre- — Auto: Thermostat automatically changes between vent drafts from affecting the thermostat. heating and cooling based on indoor temperature. — Cool: Thermostat controls cooling. — Off: Heating, cooling, and fan are all off. SETTINGS — Heat: Thermostat controls heating. — Em Heat: Auxiliary heat serves as first stage. Compressor stages are locked off. Using Thermostat Keys The thermostat keys are used to: Fan Settings • set current time and day, — On: See Table 1. • program times and setpoints for heating and cooling, — Auto: Fan always cycles with call for heat or cool. • override the program temperatures, — Conventional: The equipment (i.e. plenum switch) • display present setting, controls fan operation in heat mode. Thermostat • set system and fan operation. controls fan operation in cool mode. NOTE: See Fig. 5 for keypad information. — Electric Heat: Thermostat controls fan operation in both heat and cool modes. NOTES: Fan operation can extend (delay Off) after the heating/cooling turns off: — Heating choices are 0 or 90 seconds. — Cooling choices are 0 or 40 seconds. Table 1. T7351 Intelligent™ Fan ON control logic Call for Occupancy Heat/Cool Scheduled Motion Sensor Effective Period Signal Occupancy Yes No Notes Occupied No Sensor Wired Occupied Fan On Fan On Occupied Motion Sensed Occupied Fan On Fan On Effective Occupancy is Standby. Standby setpoints are used and it assumes that the Occupied No Motion Sensed Standby Fan On a Fan Off space is unoccupied. Fan is on only when there is a call for heating or cooling. Not Occupied No Sensor Wired Not Occupied Fan On Fan Offa Occupancy sensor will only be active during scheduled Occupied periods. During scheduled Not Occupied Motion Sensed Not Occupied Fan On a Fan Off Not Occupied periods, the effective occupancy Not Occupied No Motion Sensed Not Occupied Fan On Fan Offa will always be Not Occupied. a In heat mode, when set for conventional heat, the equipment (i.e. plenum switch) could power the fan despite the T7350 3 62-0258—05 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Temperature Set Day/Time Override Occupied Not Occupied Temporary Temporary Day Time Occupied Not Occupied HEATCOOL HEAT COOL Schedule System Fan Run Clear Day Occupied Not Occupied Start Time Copy HEAT COOL ON AUTO Schedule M19610 Fig. 5. Thermostat key locations. INSTALLER SETUP A combination of key presses are required to use the Installer Setup feature: For most applications, the thermostat factory settings do 1. To enter the Installer Setup, press and hold both the not need to be changed. Review the factory settings in Run Schedule and the Copy keys until DEGREES Table 2. 00 (or DEGREES 01) displays. NOTE: When power is first applied to the thermostat, the NOTE: Installer Setup will display WAIT and is display will show all segments (see Fig. 6). unavailable for 30 seconds after power up. Table 2. Default Setpoints. 2. To advance to the next Installer Setup number, press . Control Occupied Not Occupied Standby Heating 70° F (21° C) 55° F (13° C) 67° F (19° C) NOTE: Pressing Run/Copy again while in this mode displays the T7351 firmware version Cooling 75° F (24° C) 85° F (29° C) 78° F (26° C) number. TemporaryStandby Set Set Schedule Room 3. To return to a Setup item, cycle through the options. Not Occupied12 StartTime 4. To change a setting, use the up or down key. AM % 5. To exit the Installer Setup, press Run Schedule. PM 6. Display prompts SAV CFG (save configuration). MonTueWedThuFriSatSunHol MinsDays System Fan a. If you want to save the new configuration, use EmHeat Off CoolAuto Dehumid OnAuto the up or down key to change NO to M19611 YES before pressing Run Schedule. b. If you want the configuration to remain as it was Fig. 6. LCD display of all segments. before starting this change, ensure the display indicates SAV CFG NO and press Run Schedule. CAUTION NOTE: Installer Setup is automatically exited after five Possible Equipment Damage. minutes with no key pressed. Upon this auto- Fan must be running when system is matic exit, all changes are lost. operating. Heat pump and electric heat systems must be Configuration configured correctly to prevent equipment damage Configuration can be done with the keypad using the caused by the system running without the fan. Installer Setup (ISU). Setup Using Keypad The installer uses the Installer Setup to customize the thermostat to specific systems Table 3. Installer Setup. Text Default Choices Notes DEGREES 0 0 -1 Degree Temperature Format 0: Degrees F 1: Degrees C CLOCK 0 0 - 1 Clock Display Format 0: 12 hour 1: 24 hour KEYLOCK 0 0 - 3 Keypad Lockout Level 0: None 1: Lockout all keys except Set Day, Set Time, Set Date, Set Holidays, Temporary Occupied, Temporary Not Occupied, System, Fan, Up, Down and Information 2: Lockout all keys except Set Day, Set Time. Set Date, Set Holidays, Temporary Occupied, Temporary Not Occupied, Up, Down and Information 3: Lockout all keys except Information 62-0258—05 4 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 3. Installer Setup. (Continued) Text Default Choices Notes HEATPMP 0 0 - 2 Application Type Selection 0: Conventional 1: Heat Pump - Cooling (Energize O/B on call for cool) 2: Heat Pump - Heating (Energize O/B on call for heat) COOLSTG 1 0 - 4 Number of Cooling Stages 0: 0 Stages of Cooling 1: 1 Stages of Cooling 2: 2 Stages of Cooling 3: 3 Stages of Cooling (Not available if Heat Pump is selected) 4: 4 Stages of Cooling (W3 will be used as 4th stage relay) (Not available if Heat Pump is selected) HEATSTG 1 0 - 3 Number of Heating Stages (Not available if Heat Pump is selected) 0: 0 Stages of Heating 1: 1 Stages of Heating 2: 2 Stages of Heating (This is the max if 4 cooling stages is selected) 3: 3 Stages of Heating AUX STG 0 0 - 2 Number of Heat Pump Heating Stages (Only shown when Heat Pump is selected) 0: 0 Aux Stages 1: 1 Aux Stages 2: 2 Aux Stages AUX CON 0 0 - 3 Aux Contact Functionality 0: Time of Day 1: Economizer 2: Dehumid - Hot Gas Bypass 3: Simple Dehumid WALLMOD 0 0 - 3 Remote Room Sensor Selection 0: Local sensor only 1: TR21/TR24 and T7770A/D (Remote Sensor, No Remote Setpoint, Bypass 0) 2: TR22/TR23 and T7770B/C (Remote Sensor, Remote Setpoint, Bypass 0) 3: T7771 (Remote sensor, Remote Setpoint, Bypass 1) (Bypass 0 means that by pressing the override button the thermostat goes from unoccupied to occupied and the LED will light up and the temporary occupied timer will begin. If the button is pressed again, the timer will restart.) (Bypass 1 means that by pressing the override button a second time the thermostat can return to the unoccupied period.) OATSENS 0 0 - 1 Outdoor Air Sensor Selection 0: None 1: Remote Outdoor Air Sensor DATSENS 0 0 - 1 Discharge Air Sensor Selection 0: None 1: Remote Discharge Air Sensor HUMSENS 0 0 - 2 Room Humidity Sensor selection 0: None 1: On Board Sensor 2: Remote Sensor OCCSENS 0 0 - 1 Occupancy Sensor Selection 0: None 1: Remote Occ Sensor FAN HT 0 0 - 1 Fan Operation on Heat 0: Conventional (Equipment controls Fan) 1: Electric (Thermostat turns on Fan with call for Heat) XFAN HT YES YES or NO Extended Fan on Heat NO: None YES: 90 seconds XFAN CL NO YES or NO Extended Fan on Cool NO: None YES: 40 seconds STRTDEL 0 0 - 15 Sequential Start Delay 0 to 150 seconds in 10 second increments ADVANCE NO YES or NO Advanced Settings NO: Hide YES: Show 5 62-0258—05 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 3. Installer Setup. (Continued) Text Default Choices Notes TMP LIM 3 0 - 5 Temporary Setpoint Adjustment 0: 0 Deg. F 1: 1 Deg. F 2: 2 Deg. F 3: 3 Deg. F 4: 4 Deg. F 5: 5 Deg. F TMP OCC 3 1 - 8 Temporary Occupied Duration 1 to 8 hours TMP CAL 0 -4 - 3 Temporary Display Adjustment 0 - 3 = 0 to 3 DDF 4 - 7 = -4 to -1 DDF MINCOOL 45° F 45° - 99° F Min Cool Setpoint (7° C) (7° - 37° C) MAXHEAT 90° F 40° - 90° F Max Heat Setpoint (32° C) (4° - 32°) HEATLCK NO YES or NO Heating Lockout (Only displayed if Outdoor Air Sensor is selected) NO: None YES: Enabled HTLCKSP 70° F -40° - 120 ° F Heating Lockout Temperature (21° C) (-40° - 49° F) (Display only if Remote Outdoor Air Sensor is configured) COOLLCK NO YES or NO Cooling Lockout (Only displayed if Outdoor Air Sensor is Selected) NO: None YES: Enabled CLLCKSP 35° F -40° - 120° F Cooling Lockout Temperature (2° C) (-40° - 49° C) (Display only if Remote Outdoor Air Sensor is configured) DAT LL NO YES or NO Discharge Low Limit (Only displayed if Discharge Air Sensor is Selected) NO: None YES: Enabled DATLLSP 45° F 35° - 60° F Discharge Low Temp Limit (7° C) (2° - 16° C) (Display only if Discharge Sensor is configured) DAT HL NO YES or NO Discharge High Limit (Only displayed if Discharge Air Sensor is Selected) NO: None YES: Enabled DATHLSP 110° F 65° - 140° F Discharge High Temperature Limit (43° C) (18° - 60° C) (Display only if Discharge Sensor is configured) DEHUMID 0 0 - 5 Dehumidification 0: None 1: MinOn Time 2: Reset Temp Setpoint 3: Reset w/ MinOn 4: Reheat 5: Reheat w/ Min On DEH MIN 5 5 - 15 Dehumidify Minutes On DEH TMP 2 1 - 5 Dehumidify Temp Reset MINHTRT 5 0 - 20 DDF/HR Minimum Heat Recovery Ramp Rate MAXHTRT 8 0 - 20 DDF/HR Maximum Heat Recovery Ramp Rate (Only Displayed if Outdoor Sensor is Selected) MINHTOA 0° F -20° - 120° F Minimum Heat Outdoor Air Temperature (Only Displayed if Outdoor Sensor is (-18° (-29° - 49° C) Selected) C) MAXHTOA 40° F -20° - 120° F Maximum Heat Outdoor Air Temperature (Only Displayed if Outdoor Sensor is (4° C) (-29° - 49° C) Selected) MINCLRT 3 0 - 20 DDF/HR Minimum Cool Recovery Ramp Rate MAXCLRT 6 0 - 20 DDF/HR Maximum Cool Recovery Ramp Rate (Only Displayed if Outdoor Sensor is Selected) MINCLOA 90° F -20° - 120° F Minimum Cool Outdoor Air Temperature (Only Displayed if Outdoor Sensor is (32° C) (-29° - 49° C) Selected) MAXCLOA 70° F -20° - 120° F Maximum Cool Outdoor Air Temperature (Only Displayed if Outdoor Sensor is (21° C) (-29° - 49° C) Selected) 62-0258—05 6 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 3. Installer Setup. (Continued) Text Default Choices Notes (DayLight Savings options only display when Date is valid) DSTMON1 3 0 - 12 DLS Spring Month DSTDAY1 40 0 - 31, 32 - 74 DLS Spring Day 0 - 31 = Day of Month 32 = Last Day of Month 33 = First Sunday etc… DSTMON2 11 0 - 12 DLS Fall Month DSTDAY2 33 0 - 31, 32 - 74 DLS Fall Day 0 - 31 = Day of Month 32 = Last Day of Month 33 = First Sunday etc… HT RESP 1 0 - 3 0: Standard - 3 cph 1: Medium - 6 cph 2: Fast - 9 cph 3: Super Fast - 20 cph CL RESP 0 0 - 1 0: Standard - 3 cph 1: Fast - 4 cph Holidays and 365 - Day Clock The T7351can be configured to schedule up to 10 Holidays can be set in the following manner: separate holidays, each with a duration of up to 99 days. 1. Press the “Temporary Occupied” and Temporary To enable this function, the user must set the date: Not Occupied” keys simultaneously. 2. The month (MON) of the first holiday is then dis- 1. Press Set Day and Set Time keys simultaneously. played (00 means the holiday is ignored). 2. Use the Up/Down keys to set the date to YES, then 3. Use the Up/Down keys to set the month, then press press the key. the key. 3. Use the Up/Down keys to set the month, then press 4. Use the Up/Down keys to set the day, then press the key. the key (see Table 4 for valid day choices). 4. Use the Up/Down keys to set the day, then press 5. Use the Up/Down keys to set the duration. the key (See Table 4 for valid day choices). The first holiday is now set and pressing the key will 5. Use the Up/Down keys to set the year, then press take you to programming the second holiday (denoted by the key. the number 2 on the screen). Table 4. Valid Day Values. Value Description Value Description Value Description Value Description 1 to 31 Day of month 42 Second Tuesday 53 Third Saturday 64 Fifth Wednesday 32 Last Day of Month 43 Second Wednesday 54 Fourth Sunday 65 Fifth Thursday 33 First Sunday 44 Second Thursday 55 Fourth Monday 66 Fifth Friday 34 First Monday 45 Second Friday 56 Fourth Tuesday 67 Fifth Saturday 35 First Tuesday 46 Second Saturday 57 Fourth Wednesday 68 Last Sunday 36 First Wednesday 47 Third Sunday 58 Fourth Thursday 69 Last Monday 37 First Thursday 48 Third Monday 59 Fourth Friday 70 Last Tuesday 38 First Friday 49 Third Tuesday 60 Fourth Saturday 71 Last Wednesday 39 First Saturday 50 Third Wednesday 61 Fifth Sunday 72 Last Thursday 40 Second Sunday 51 Third Thursday 62 Fifth Monday 73 Last Friday 41 Second Monday 52 Third Friday 63 Fifth Tuesday 74 Last Saturday Table 5. T7351 Key Function Summary. Grouping Button Definition Information Down Arrow Lowers setpoint, day, or time. When setting times or temperatures, hold key down to continuously decrease value. Also can make temporary change in temperature setpoint. Information Obtains information (where humidity “high-limit” can be set), cycles through setup options. Up Arrow Raises setpoint, day, or time. When setting times or temperatures, hold key down to continuously increase value. Also can make temporary change in temperature setpoint. 7 62-0258—05 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 5. T7351 Key Function Summary. (Continued) Grouping Button Definition Temperature Occupied Sets Occupied Heat setpoint. Heat Occupied Sets Occupied Cool setpoint. Cool Not Sets Not Occupied Heat setpoint. Occupied Heat Not Sets Not Occupied Cool setpoint. Occupied Cool Set Day Sets day of week. Tapping key with 'Set Value' segment on increases current day (same effect as Up Arrow key). Time Sets time. Tapping key with “Set Value” segment on increases time in one hour increments. Override Temporary Temporary occupied setting for length of time defined by installer. User can Occupied modify setpoints. Temporary Not Sets holiday length. User selects number of days (“0”-”99”), or “---” for Occupied continuous override. Schedule Day Selects day schedule to modify. (Used also with copy key.) Occupied Selects occupied event start times for specified day. Repeatedly press this key to toggle between two occupied events. Not Occupied Selects not occupied event start times for specified day. Repeatedly press this key to toggle between two not occupied events. Clear Start Time Clears start time for specified period and day. Copy Copies schedule from one day to another. System Selects System Mode. Toggles through Em Heat, Heat, Off, Cool, and Auto. Fan Selects fan operation mode. Toggles between On and Auto.a Run Schedule Resumes running schedule (cancels Temporary Occupied action, Holiday, and/or Temporary setpoint changes.) a On: Continuous fan operation during occupied periods. During not occupied periods and in standby mode when no motion is sensed, fan cycles with call for heat or cool. Auto: Fan cycles with call for heat or cool during all periods. (See Product Data Sheet, form 63-2605, for more details). NOTES: The display returns to default screen after pressing Run Schedule (or after a period of time without keypress): — ten seconds: when returning from temporary setpoint changes, info screen, temp occ, and temp not occ. — one minute: when returning from setting clock/day. — ten minutes: when returning from System Checkout. — five minutes: when returning from all other modes. Special Functions Restore Factory Configuration (Run/ 3. Press Run Schedule. Clear) Get Factory Schedule (Info/Clear) IMPORTANT Performing this operation reverts the schedules to the This operation erases current configuration and factory defaults: restores factory defaults for all configuration, 1. Press both Info and Clear Start Time. parameters, setpoints and schedules. To regain 2. The display gives the option to revert to FAC SCH. the old requires device reconfiguration. a. To restore the factory schedule, press up or down until the display indicates YES. 1. Press both Run Schedule and Clear Start Time. b. To cancel this option, ensure display indicates 2. The display gives the option to revert to FAC CFG. NO. a. To restore the factory defaults, press up or 3. Press Run Schedule. down until the display indicates YES. b. To cancel this option, ensure the display indicates NO. 62-0258—05 8 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Test Mode (Occupied/Not Occupied/ NOTES: — These methods operate only during cooling. Schedule Day) — Selecting both Reheat and Reset options can cause frequent setpoint adjustments. This CAUTION selection is not recommended. Possible Equipment Damage. Min. ON Time Equipment damage can result if compressor is Dehumidifies by increasing the compressor minimum on cycled too quickly. time (normally 3 minutes) by a programmable amount. The minimum off time for compressors is This is useful with oversized systems in that it forces the bypassed during Test Mode. Equipment damage coils to cool to a point where dehumidification can occur. can occur if the compressor is cycled too quickly. NOTES: Use the Test Mode to check the thermostat configurations — Can force wider temperature swings by cool- and operation. To start the system test: ing when setpoint control does not require it. 1. Press Schedule Day, Occupied and Not Occupied — The minimum on time can be set within the simultaneously. range of 5 to 15 minutes. 2. The display gives the option to TEST. — Hysteresis and a minimum timer are used to a. To enter test mode, press up or down ensure this behavior does not change with until the display indicates IN TEST. every equipment cycle. b. To cancel this option, ensure display indicates NO TEST. Reheat 3. Press Run Schedule. Dehumidifies by operating cooling during typical off time. The T7351 maintains the proper setpoint by running the NOTES: heat at the same time. — To verify whether or not the system test is still active, repeat the above process. IMPORTANT — The system test times out after ten minutes At times during Reheat dehumidification, the with no key pressed. T7351 operates heating and the cooling simulta- neously. This is normal. Save User Schedule (Info/Copy) Performing this operation saves the current schedule NOTES: (including holidays) to memory, overwriting the old saved — The heat stage never energizes during schedule: Reheat if more than one cool stage is on. 1. Press both Info and Copy. — Reheat mode cannot occur during heating. 2. The display gives the option to revert to SAV SHD. a. To save the current schedule, press up or Reset Temp SetPt down until the display indicates YES. The room temperature set point resets to a specified b. To cancel this option, ensure display indicates number of degrees below the actual set point when room NO. relative humidity (RH) rises above humidity high limit set 3. Press Run Schedule. point. Get User Schedule (Info/Run) Though this may not technically reduce relative humidity Getting the user schedule restores the schedule in the room, it reduces the dew point to provide the (including holidays) from saved memory, overwriting the customer with a sense of comfort due to a lower schedule currently in use: temperature setting in the room. 1. Press both Run Schedule and Info. 2. The display gives the option to GET SHD. As long as RH stays above humidity high limit set point, a. To retrieve the saved schedule, press up or this set point is maintained. down until the display indicates YES. b. To cancel this option, ensure display indicates NOTE: Hysteresis and a minimum timer prevent the set NO. point from short interval alternation (between 3. Press Run Schedule standard and reset set points). Options Utilizing Auxiliary Output DEHUMIDIFICATION There are two dehumidification options that utilize the auxiliary output. They are: There are five methods through which the T7351 can — Simple Dehumidification. control for dehumidification. Three of them modify the — Hot Gas Bypass Dehumidification. control algorithm, thus providing limited dehumidification through cooling. The other two use the auxiliary output to Simple Dehumid(ification) control another device. The auxiliary output: — Energizes when RH rises above humidity high limit. NOTE: The dehumidification high limit can be set within — De-energizes when RH drops below humidity high the range of 10 to 90 percent relative humidity. limit. Control Through Cooling NOTES: Configure using some combination of the following: — Hysteresis and a minimum timer prevent — Minimum On. short cycling of this output. — Reheat. — Unlike Dehumid Hot Gas BP the relay — Reset. remains energized during calls for multiple cooling stages. 9 62-0258—05 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Dehumid Hot Gas BP Auxiliary output during call for multiple cooling stages for The auxiliary output operates as shown in Table 6. two reasons: 1. This method assumes that the cooling provides Table 6. Hot Gas Bypass Dehumidification Logic. dehumidification. 2. Multiple cooling stages probably provide necessary Humidity Cooling Stages Active Auxiliary Output dehumidification. High more than one De-energized 3. Hysteresis and a minimum timer prevent short cycling of this output. High one or less Energized Low more than one De-energized Low one or less De-energized 62-0258—05 10 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT WIRING DIAGRAMS TR23-H REMOTE SENSOR OUTDOOR AIR SENSOR COMPRESSOR CONTACTOR 2 GND SENSOR PT SET LED BYPASS 1 2 3 4 5 6 7 8 9 10 11 12 DISCHARGE AUX HEAT AIR SENSOR STAGE 1 SUBBASE T5 T6 T7 T4 T3 OS OS AS AS W2W1 Y2 4 HS HC HP MM X RH RC AUX O/B Y1 G 2 HUMIDITY MOTION CHANGE- FAN SENSOR SENSOR OVER RELAY COMPRESSOR CONTACTOR 1 3 L2 L2 1 ECONOMIZER 1 L1 L1 (HOT) (HOT) HEATING COOLING TRANSFORMER TRANSFORMER 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER. 3 USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS. 4 WHEN USING THE TR23-H FOR HUMIDITY SENSING, THERE IS NO NEED TO WIRE THE HC TERMINAL BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED TO TERMINAL 1 COMMON AT THE SENSOR. M29323 Fig. 7. Typical hookup of T7351F2010 in two-stage heat and two-stage cool heat pump system with two transformers. TR23-H REMOTE SENSOR OUTDOOR AIR HEAT SENSOR RELAY 2 GND SENSOR PT SET LED BYPASS 1 2 3 4 5 6 7 8 9 10 11 12 DISCHARGE AIR COMPRESSOR COMPRESSOR SENSOR CONTACTOR 4 CONTACTOR 2 SUBBASE T5 T6 T7 T4 T3 OSOS AS AS W3/Y4 Y3 W2 Y2 HS HC HP M M X RH RC AUX W1 Y1 G 5 COMPRESSOR CONTACTOR 3 HUMIDITY MOTION 3 HEAT FAN SENSOR SENSOR RELAY 1 RELAY COMPRESSOR CONTACTOR 1 4 L2 1 2 ECONOMIZER L1 (HOT) 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD. 3 HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER. 4 USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS. 5 WHEN USING THE TR23-H FOR HUMIDITY SENSING THERE IS NO NEED TO WIRE HC TERMINAL BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED TO TERMINAL 1 COMMON AT THE SENSOR. M29254 Fig. 8. Typical hookup of T7351F2010 in two-stage heat and four-stage cool conventional system. 11 62-0258—05 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT TR23-H REMOTE SENSOR OUTDOOR AIR COMPRESSOR SENSOR CONTACTOR 2 GND SENSOR PT SET LED BYPASS 1 2 3 4 5 6 7 8 9 10 11 12 DISCHARGE HEAT HEAT AIR RELAY 3 RELAY 2 SENSOR SUBBASE T5 T6 T7 T4 T3 OSOS AS AS W3/Y4 Y3 W2 Y2 5 HS HC HP M M X RH RC AUX W1 Y1 G COMPRESSOR CONTACTOR 3 HUMIDITY MOTION 3 HEAT FAN SENSOR SENSOR RELAY 1 RELAY COMPRESSOR 4 CONTACTOR 1 L2 1 2 ECONOMIZER L1 (HOT) 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 ENSURE TRANSFORMER IS SIZED TO HANDLE THE LOAD. 3 HEAT/COOL SYSTEMS WITH ONE TRANSFORMER REQUIRE THE FACTORY-INSTALLED JUMPER. 4 USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS. 5 WHEN USING THE TR23-H FOR HUMIDITY SENSING THERE IS NO NEED TO WIRE HC TERMINAL BECAUSE THE T3 TERMINAL IS INTERNALLY TIED TO HC, WHICH IS ALSO TIED TO TERMINAL 1 COMMON AT THE SENSOR. M29255 Fig. 9. Typical hookup of T7351F2010 in three-stage heat and three-stage cool conventional system with one transformer. TROUBLESHOOTING GUIDE (TABLE 7) Table 7. Troubleshooting Information. Symptom Possible Cause Action Display will not Thermostat is not being Check that X terminal is connected to the system transformer. come on. powered. Check for 24 Vac between X and RH terminals. If missing 24 Vac: • Check if circuit breaker is tripped; if so, reset circuit breaker. • Check if system fuse is blown; if so, replace fuse. • Check if the HVAC equipment power switch is in the Off position; if so, set to the On position. • Check wiring between thermostat and HVAC equipment. Replace broken wires and tighten loose connections. If 24 Vac is present, proceed with troubleshooting. Temperature Thermostat is configured Press both Run Schedule and Copy, then reconfigure the display. display is for °F or °C display. incorrect. Bad thermostat location. Relocate the thermostat. Display shows three T7351 is set for remote sensing and sensor is missing or circuit is dashes and a degree sign either open or shorted. (all systems shut down). Temperature Upper or lower temperature Check the temperature setpoints: settings will not limits were reached. • Heating limits are 40 to 90°F (7 to 31°C) change. • Cooling limits are 45 to 99°F (9 to 37°C) (Example: Occupied setpoint Check setpoint stops. If necessary, reconfigure the stop(s). Cannot set temperature range stops heating higher or were configured. cooling lower.) Keypad is locked. When a Press both Run Schedule and Copy, then change keypad lock level. locked key is pressed, LOCKED appears momentarily on the LCD. Room Remote temperature Check all remote sensors. temperature is sensing is not working. out of control. 62-0258—05 12 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 7. Troubleshooting Information. (Continued) Symptom Possible Cause Action Heat will not No power to the thermostat. Check that X terminal is connected to the system transformer. come on. Check for 24 Vac between X and RH terminals. If missing 24 Vac: • Check if circuit breaker is tripped; if so, reset circuit breaker. • Check if system fuse is blown; if so, replace fuse. • Check if the HVAC equipment power switch is in the Off position; if so, set to the On position. • Check wiring between thermostat and HVAC equipment. Replace broken wires and tighten loose connections. If 24 Vac is present, proceed with troubleshooting. Thermostat minimum off • Wait up to five minutes for the system to respond. time is activated. • Configure heating response. System selection is set to Set system selection to Heat or Auto. Off or Cool. Cooling will not No power to the thermostat. Check that X terminal is connected to the system transformer. come on. Check for 24 Vac between X and RH terminals. If missing 24 Vac: • Check if circuit breaker is tripped; if so, reset circuit breaker. • Check if system fuse is blown; if so, replace fuse. • Check if the HVAC equipment power switch is in the Off position; if so, set to the On position. • Check wiring between thermostat and HVAC equipment. Replace broken wires and tighten loose connections. If 24 Vac is present, proceed with troubleshooting. Thermostat minimum off • Wait up to five minutes for the system to respond. time is activated. • Configure cooling response. System selection is set to Set system selection to Cool or Auto. Off or Heat. System indicator The call for heat or cool is Check if any stage indicators (dots next to the system indicator) are (flame: heat, not yet given. displayed. With no display of stage indicators, no call for cool/heat is snowflake: cool) yet given. is displayed, but Conventional heating Wait one minute after seeing the on indicator and then check the no warm or cool equipment turns the fan on registers. air is coming only after the furnace has from the warmed to a setpoint. registers. Heating or cooling Verify operation of heating or cooling equipment in self-test. equipment is not operating. 13 62-0258—05 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT 62-0258—05 14 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT 15 62-0258—05 T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive ® U.S. Registered Trademark Toronto, Ontario M1V 4Z9 © 2010 Honeywell International Inc. 62-0258—05 M.S. Rev. 09-10 customer.honeywell.com Printed in U.S.A.

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