T7350 Commercial Programmable Thermostat FOR SINGLE- OR MTG512ULTI-STAGE CONVENTIONAL/HEAT PUMP SYSTEMS PRODUCT DATA FEATURES • Typically used in buildings (including: restaurants, shopping malls, office buildings and banks) under 55,000 square feet. • For single zone rooftop units, split systems, heat pumps or hot/chilled water systems. • 7-day programming. • Two Occupied and two Not Occupied periods per day.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT FEATURES (continued from page 1) Features Available via PDA Configuration Features via Optional Network Model-H • 365 day clock with holiday programming. • Communications on LonTalk® network. • Automatic Daylight Saving Time adjustments. • Network Tools (LonSpec, CARE) have ability to configure all PDA available features. • Selectable dehumidification limit control.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit might not exactly match listed specifications. This product is tested and calibrated under closely controlled conditions; minor performance differences can be expected if those conditions are changed. Models: See Table 1. Dimensions: See Fig. 1. Finish (color): Trident White. Batteries: No batteries required. Table 1.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT PDA System Requirements: Palm OS®: 3.5.x to 5.2.1 Dynamic Heap: 256K bytes. Free RAM Space: 1000K bytes. Serial Communications: RS-232. Approvals: European Community Mark (CE) Listed. UL 873 Recognized, NEC Class 2. FCC Part 15 subpart J Class A. cUL. Table 2. Default Setpoints.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Hardware Output Hardware Output SCC-Rooftop Object Number 8504.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT INSTALLATION When Installing this Product... 1. 2. 3. 4. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check ratings given in instructions and on the product to ensure the product is suitable for your application. Installer must be a trained, experienced service technician. After installation is complete, check out product operation as provided in these instructions.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT — for a vertical box, part 209651A is required. — Mount to European standard wall box (having 60.3 mm [2.4 in.] between mounting screws in a horizontal line) with or without adaptive hardware. 1. SUBBASE T4 T7770A Position and level the subbase. T T3 T7770A T T T7770A T T T NOTE: A level wallplate is only for appearance. The thermostat functions properly when not level. 2. 3. 4. 5. 6. 7. Use a pencil to mark the mounting holes. (See Fig. 7.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Wiring Table 4. T7350B Subbase for Two-stage Heat, Two-stage Cool Systems. Terminal Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. X X Common. aux aux Conventional: Auxiliary relay or 3rd stage of heating or cooling. Heat Pump: Auxiliary relay or 2nd stage auxiliary. W1 O/B Conventional: Stage 1 heating relay.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 6. T7350H Subbase for Three-stage Heat, Threestage Cool Systems with Network Communications Table 5. T7350D Subbase for Three-stage Heat, Three-stage Cool Systems. a Heat Pump Description RC RC 24 VAC Cooling transformer. a Conventional Terminal Heat Pump Conventional Terminal a a RC RC Description 24 VAC Cooling transformer. RHa RH 24 VAC Heating transformer. RHa RHa 24 VAC Heating transformer. X X X X a Common. Common.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Description RCa — 24 VAC Cooling transformer. RHa — 24 VAC Heating transformer. X Common. — Terminal Conventional Heat Pump Conventional Terminal Table 8. T7350M Subbase for Modulating Systems. auxb auxb Auxiliary relay connection (normally open). Heat Pump Table 7. T7350H Subbase for Modulating Systems with Network Communications. Description RC a — 24 VAC Cooling transformer. RH a — 24 VAC Heating transformer. X — Common.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT NOTE: See Fig. 9 for keypad information. A. ENGAGE TABS AT TOP OF THERMOSTAT AND SUBBASE OR WALLPLATE. Setting Temperature Refer to Table 2 for the default temperature setpoints. See Programming section for complete instructions on changing the setpoints. Setting System and Fan System default setting is Auto. Fan default setting is On. NOTE: Use System and Fan keys to change settings.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT INSTALLER SETUP For most applications, the thermostat factory settings do not need to be changed. Review the factory settings in Table 10. NOTE: When power is first applied to the thermostat, the display will show all segments (see Fig. 10). Table 10. Keypad Configurable Installer Setup Optionsa.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT — 4. 5. No options lockout special keypresses. See the Special Functions section for details. Once the proper option is chosen, exit Installer Setup by pressing Run Schedule. The display prompts SAV CFG (save configuration). If you want to save it, use the up S or down T key to change NO to YES before pressing Run Schedule again. Configuration CAUTION Possible Equipment Damage. Fan must be running when system is operating.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 11. T7350 Key Function Summary. Grouping Information Button Down Arrow Information Up Arrow Definition T 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. Obtains information (where humidity “high-limit” can be set), cycles through setup options. S Raises setpoint, day, or time.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT PROGRAMMING The thermostat operates at the Occupied temperature setting until the thermostat is programmed. Table 12 shows the default temperature settings. (The program has four): — Occupied heat. — Occupied cool. — Not Occupied heat. — Not Occupied cool. Table 12. Occupied and Not Occupied Default Temperature Settings.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 3. 4. Press up S or down T until the desired time is displayed. Press Run Schedule. 3. 4. IMPORTANT — Invalid holidays are ignored. — Valid holidays require valid: month, day and duration. — Holidays such as the fifth Tuesday of a month with only four Tuesdays are also invalid. Use the PDA or almost exclusively keys in the “Schedule” area of the keypad for this procedure: 1. Press Occupied. 2. Press Day to select the day to be copied. 3. Press Copy. 4.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Using Temporary Occupied Override The Temporary Occupied Override can be used when the T7350 is in Not Occupied or Standby mode. It switches to the Occupied mode for a fixed number of hours. 1. — — To use the default occupied override, press Temporary Occupied. 1. 2. NOTE: The default temperature setting is the Occupied setpoint. 2.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT OPERATION Startup Operation Upon initial thermostat powerup, a startup and initialization program begins. This startup occurs only on initial powerup. After total loss of power for an extended period, the current time and day can be lost (requiring reset). However, the thermostat retains the user program. NOTE: With no program set, the thermostat controls to the Occupied default setpoints of 70°F (21°C) for heat and 75°F (24°C) for cool.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT — The Derivative Time (DT), also called Derivative Gain, determines the impact of the error rate on the output signal. The error rate is how fast the error value changes. It can also be the direction the space temperature is going, either toward or away from the setpoint, and its speed—rapid or slow. A decrease in DT causes, for a given error rate, a greater effect on output signal.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 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. COOL RECOVERY RAMP RATE (DEGREES/HOUR) Economizers take advantage of 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.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT T7350A,B,D,M SUBBASE T7350H SUBBASE AUX AUX TO LOAD AUXILIARY RELAY CONTACT 1 X TO LOAD AUX RH AUXILIARY RELAY CONTACT 1 1 RELAY REQUIRED (R8222 OR SIMILAR). M19613 Fig. 14. Using T7350A,B,D,M models with an external relay (with loads greater than 1.5A). L2 2 L1 (HOT) 1 RELAY REQUIRED (R8222 OR SIMILAR). 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. AUXILIARY TRANSFORMER M22488 Fig. 16.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Dehumidification (T7350D,M,H only) There are five methods through which the T7350 can control for dehumidification. Three of them modify the control algorithm, thus providing limited dehumidification through cooling. The other two use the auxiliary output to control another device. IMPORTANT Configurable only with a PDA or a network tool such as LonSpec or CARE. NOTE: The dehumidification high limit can be set within the range of 10 to 90 percent relative humidity.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT TROUBLESHOOTING GUIDE (TABLE 19) Table 19. Troubleshooting Information. 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 RH or RC 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.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 19. Troubleshooting Information. (Continued) Symptom Possible Cause Action 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 RC 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.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT WIRING DIAGRAMS (FIG. 17-25) SUBBASE X RH RC AUX W1 Y1 G 2 FAN RELAY HEAT RELAY 1 HEAT RELAY 2 COMPRESSOR CONTACTOR 1 L2 1 L2 1 L1 (HOT) L1 (HOT) HEATING TRANSFORMER COOLING 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. M19764A Fig. 17.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT OUTDOOR AIR SENSOR T7770 REMOTE SENSOR 9 8 7 6 5 4 3 2 AUX HEAT STAGE 1 DISCHARGE AIR SENSOR 1 COMPRESSOR CONTACTOR 2 SUBBASE T5 T6 T7 T3 T4 OS OS AS AS X RH RC AUX O/B W2 Y2 Y1 G 2 FAN RELAY CHANGE OVER COMPRESSOR CONTACTOR 1 3 1 L2 L2 1 L1 (HOT) ECONOMIZER L1 (HOT) HEATING TRANSFORMER COOLING TRANSFORMER 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT OUTDOOR AIR SENSOR T7770 REMOTE SENSOR 9 8 7 6 5 4 3 2 HEAT RELAY 2 DISCHARGE AIR SENSOR 1 COMPRESSOR CONTACTOR 4 COMPRESSOR CONTACTOR 2 SUBBASE T5 T6 T7 T4 T3 OS OS AS AS HS HC HP M M X RH W3/Y4 Y3 RC AUX W1 W2 Y2 Y1 G COMPRESSOR CONTACTOR 3 HUMIDITY SENSOR 3 MOTION SENSOR COMPRESSOR CONTACTOR 1 4 1 2 FAN RELAY HEAT RELAY 1 L2 ECONOMIZER L1 (HOT) 1 POWER SUPPLY.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 9 8 7 6 5 4 3 MODULATING R COOL – + (4-20 mA) X OUTDOOR AIR SENSOR T7770 REMOTE SENSOR 2 MODULATING HEAT – + (4-20 mA) DISCHARGE AIR SENSOR 1 R X SUBBASE T5 T6 T7 T4 T3 OS OS AS AS EB EB HS HC HP M M X RH AX AH AC RC AUX W1 AUX Y1 G 2 LONWORKS® BUS HUMIDITY SENSOR LONWORKS® BUS COMPRESSOR CONTACTOR 1 3 1 FAN RELAY HEAT RELAY 1 MOTION SENSOR L2 ECONOMIZER L2 1 L1 (HOT) L1 (HOT) HEATING TRANSFORMER COOLING TRANSFOR
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 9 8 7 6 5 4 3 MODULATING R COOL – + (4-20 mA) X OUTDOOR AIR SENSOR T7770 REMOTE SENSOR 2 MODULATING HEAT – + (4-20 mA) DISCHARGE AIR SENSOR 1 R X SUBBASE T5 T6 T7 T4 T3 OS OS AS AS HS HC HP M M X RH MX MH MC RC AUX W1 Y1 G 2 HUMIDITY SENSOR HEAT RELAY 1 MOTION SENSOR 3 1 L2 FAN RELAY COMPRESSOR CONTACTOR 1 L2 1 L1 (HOT) ECONOMIZER L1 (HOT) HEATING TRANSFORMER COOLING TRANSFORMER 1 POWER SUPPLY.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT APPENDIX - PDA USAGE Configuration See Table 20 for the advanced setup options available through a PDA. Whether the configuration is performed offline or while connected, the procedure is the same. NOTE: Upon initial thermostat power-up, wait at least 30 seconds before connecting the TIM. OFFLINE CONFIGURATION While disconnected from the thermostat, you can arrange and save named configurations.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT c. Occ(upancy) Sensor. d. Discharge Air Temp(erature). e. Outdoor Air Temp(erature). To configure a T7350: 1. From the opening screen, tap Select Existing Config. (See Fig. 28.) 2. Select the desired configuration. NOTE: Some selections only appear for the models that support them. Fig. 28. Select Existing Config. 3. 4. 5. This brings up the Summary screen. From here, you can make changes using the: a. Novice navigation screens (that appear), or b.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT T7350D T7350M Fig. 34. Outputs screen. 16. Fig. 32. Cooling Config(uration) screen. 12. 13. Make changes and tap “Next” to proceed to the Heating Config(uration) screen. The Heating Config(uration) screen facilitates changes to: a. Number of Stages. b. Heating Response. c. OAT Lockout and DAT High Limit Setpoints (for some models). 17. Make changes and tap “Next” to proceed to the Fan screen. The Fan screen facilitates changes to: a. Fan Switch (On or Auto).
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Fig. 40. Weekly Schedule Mode CopyDayTo. Fig. 36. Weekly Schedule screen. 20. 21. Tap “Next” to proceed to the SetPoints screen. The SetPoints screen facilitates changes to the: a. Default setpoints. b. Occupied Setpoint stops. c. Temporary Override duration. Fig. 37. Weekly Schedule modification screen. Fig. 41. SetPoints screen. 22. 23. 24. 25. 26. Fig. 38. Weekly Schedule Mode modification. Make changes and tap “Next” to return to the Summary screen.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Fig. 42. Summary screen with configuration numbers. Deleting Configurations 1. Make certain you are in a configuration other than the one you plan to delete. 2. Tap the Summary tab in the upper left corner. 3. Select File / Delete. 4. Select the configuration to delete. 5. Tap DELETE. 6. A prompt appears allowing you to cancel the deletion. 7. To delete more configurations, return to step 4. 8. When finished with deletions, tap DONE. Fig. 43. Holiday screen. 2.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Online Diagnostics • Thermostat hardware version. • Subbase hardware version. • Run time error messages. Connect to a thermostat and, using the “Monitor Data” function, read diagnostic information including: • Thermostat firmware version. Table 20. Thermostat Setup Options Through PDA.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 20. Thermostat Setup Options Through PDA. (Continued) Configuration Option PDA Factory Defaulta Tool CnfgID Description Temperature Display Calibration No Change X No Change: Displayed temperature is actual room temperature. Can adjust to display up to 3° F (1.7° C) higher or down to 4° F (2.2° C) lower than room temperature. TempOverride 3 X X Temporary Occupied Override duration. Range: 1 to 8 hours.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 20. Thermostat Setup Options Through PDA. (Continued) Configuration Option PDA Factory Defaulta Tool CnfgID Description Dehumidification Reset Temp Setpt 2° F X Amount of reset used with “Dehumidify Reset”. Range: 1 to 5° F. Must be smaller than occupied zero energy band (ZEB) or standby ZEB. Dehumidification Reheat None X X None: No Reheat dehumidification; Enable: Dehumidification using Reheat.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 21. Exceptions to Factory Defaults. Configuration Option T7350A T7350D T7350H1009 T7350B T7350M T7350H1017 Heat Output Stages 1 2 3 0 Cool Output Stages 1 2 3 0 Room Humidity Sensor None None Local Local Heat Throttling Range 3 4 7 5 Cool Throttling Range 3 4 7 5 Heat Integral Time 3100 2500 1650 1250 Cool Integral Time 3100 2500 1650 1250 ZIRE and TUNGSTEN are trademarks of palmOne, Inc.
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 39 63-2605—5
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2007 Honeywell International Inc. 63-2605—5 J.Z. Rev.
