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Honeywell T7350 Product Data

Commercial programmable thermostat for single- or mtg512ulti-stage conventional/heat pump systems
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See also: User Manual , Instruction and Installation Manual
T7350 Commercial Programmable Thermostat
FOR SINGLE- OR MTG512ULTI-STAGE CONVENTIONAL/HEAT PUMP
SYSTEMS
APPLICATION
The T7350 Commercial Programmable Thermostat controls
24 Vac commercial single zone heating, ventilating and air
conditioning (HVAC) equipment. The T7350 consists of a
thermostat and subbase. The thermostat includes the keypad
and display for 7-day programming. The subbase includes
equipment control connections. The subbase mounts on the
wall and the thermostat mounts to the subbase.
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.
• Thermostat Interface Module (TIM) connections to
thermostat from PDA for advanced configuration,
programming, keypad lockout, etc. changes can be
made with thermostat mounted.
• Individual heat and cool setpoints available for
Occupied and Not Occupied periods.
• P+I+D control minimizes temperature fluctuations.
• Recovery ramp control automatically optimizes
equipment start times based on building load.
• Convenient overrides allow temporary setpoint
changes.
• Keypad multi-level lockout available with all models.
• Remote sensor capability for temperature (including
outdoor air and discharge air) and humidity sensors.
• Auxiliary subbase contact typically interface with a
Honeywell Economizer System (for total rooftop
control integration) or act as dehumidification output.
• Universal Versaguard™ Thermostat guards available.
• T7350H provides networking capability on LonWorks
Bus using a Free Topology Transceiver (FTT).
• T7350H Conforms to LonMark
for rooftop applications.
Specifications ...................................................................
Installation ........................................................................
Settings ............................................................................ 11
Installer Setup .................................................................. 12
Programming .................................................................... 15
Operation .......................................................................... 18
Troubleshooting Guide (Table 19) .................................... 23
Wiring Diagrams (Fig. 17-25) ........................................... 25
Appendix - PDA Usage .................................................... 30
PRODUCT DATA
®
®
Space Comfort Profile
continued
Contents
3
6
Put Bar Code Here
63-2605-5

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Summary of Contents for Honeywell T7350

  • Page 1: Table Of Contents

    24 Vac commercial single zone heating, ventilating and air • Keypad multi-level lockout available with all models. conditioning (HVAC) equipment. The T7350 consists of a • Remote sensor capability for temperature (including thermostat and subbase. The thermostat includes the keypad outdoor air and discharge air) and humidity sensors.

  • Page 2: Ordering Information

    If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care...

  • Page 3: Specifications

    Input: Temperature: 20K ohms. NOTE: To achieve the 48-hour power-loss clock retention, Humidity: 0-10 Vdc. the T7350 must be powered for at least 5 minutes. Outdoor: 3000 PTC. Discharge Air: 20K ohms. Communicating Model T7350H: Occupancy Sensor: Dry contact switching 30 Vdc at 1 mA.
  • Page 4 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT PDA System Requirements: Accessories: ® Palm OS : 3.5.x to 5.2.1 Duct Discharge Air Sensors: Dynamic Heap: 256K bytes. C7041B (6 or 12 in. [152 or 305 mm]), Free RAM Space: 1000K bytes. C7041C (18 in. [457 mm]), Serial Communications: RS-232.
  • Page 5 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Hardware Output Hardware Output Node SCC-Rooftop Object Object Number 8504. Mandatory nviRequest nvoStatus nviSpaceTemp nvoSpaceTemp Mandatory nv26 SNVT_obj_request SNVT_ obj_status SNVT_temp_p SNVT_ temp_p Network Network Variables nv27 nvoUnitStatus Variables SNVT_hvac_status nviTimeSet nvoFileStat SNVT_ time_stamp SNVT_file_status nviSetpoint...

  • Page 6: Installation

    (1.5 METERS) 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 Care Center at 1-800-468-1502. M4823A Location Fig. 3. Typical location of thermostat Do not install the thermostat where it can be affected by: or remote-mounted sensor.
  • Page 7 6. Loosely insert the mounting screws into the holes. 7. Tighten mounting screws. SUBBASE M19607A T7770A T7770A Fig. 6. Nine T7770A Sensors providing a temperature averaging network for T7350 Thermostat. T7770A T7770A WIRES THROUGH WALL MOUNTING HOLES M19606A Fig. 4. Four T7770A Sensors providing a temperature averaging network for T7350 Thermostat.
  • Page 8 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Wiring Table 4. T7350B Subbase for Two-stage Heat, Two-stage Cool Systems. Terminal CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. Description 24 VAC Cooling transformer.
  • Page 9 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 5. T7350D Subbase for Three-stage Heat, Table 6. T7350H Subbase for Three-stage Heat, Three- Three-stage Cool Systems. stage Cool Systems with Network Communications Terminal Terminal Description Description 24 VAC Cooling transformer. 24 VAC Cooling transformer.
  • Page 10 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 7. T7350H Subbase for Modulating Systems with Table 8. T7350M Subbase for Modulating Systems. Network Communications. Terminal Terminal Description Description — 24 VAC Cooling transformer. — 24 VAC Cooling transformer. — 24 VAC Heating transformer.

  • Page 11: Settings

    T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT NOTE: See Fig. 9 for keypad information. 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.

  • Page 12: Installer Setup

    1. Enter the Installer Setup: press and hold both the Run NOTE: The T7350 has serial communications to facilitate Schedule and the Copy keys until DEG F (or DEG C) use of an installer configuration tool. More advanced displays.

  • Page 13: Special Functions

    T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT — No options lockout special keypresses. See a. To restore the factory defaults, press up the Special Functions section for details. down until the display indicates YES. 4. Once the proper option is chosen, exit Installer Setup by b.
  • Page 14 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 11. T7350 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.

  • Page 15: Programming

    Program Holidays Saturday IMPORTANT Sunday — Holidays must be first programmed with a PDA. — Day-of-Week mode forces the T7350 to ignore holidays. Holiday With holidays set, holiday schedule times can be changed using the keypad: Only applies to holidays programmed with 365-day calen- 1.

  • Page 16: Copying A Day

    7. Repeat steps 2 through 6 for all the days desired. T7770 Setpoint Knob 8. Press Run Schedule. A T7770 setpoint knob can remotely adjust the T7350 setpoint. Clearing Program Start Times Adjustment can be made with the sensor in override.
  • Page 17 If the number of days is set to zero, no temporary The Temporary Occupied Override can be used when the change takes effect. T7350 is in Not Occupied or Standby mode. It switches to the — If the number of days is set just below zero, the Occupied mode for a fixed number of hours.

  • Page 18: Operation

    This extends T7350 Relay Logic equipment life as it prevents rapid cycling of equipment. All T7350 model thermostats contain four switching relays. In NOTE: Minimum on and off times are fixed. conventional applications, the relays control first stage cooling, first stage heating, fan, and auxiliary.
  • Page 19 HEAT PUMP SETPOINT Recovery Ramping Logic OCCUPIED (FOR COMPRESSORS) SETPOINT The T7350 incorporates a ramping feature that gradually changes the space setpoints. During recovery operation, the setpoint changes at a rate in degrees per hour depending on NORMAL RECOVERY RAMP the outdoor air temperature.
  • Page 20 Fig. 13. Setpoint ramping parameters with ramp rate suitable air is permitted to enter the building. calculation. The T7350 can take advantage of an economizer by closing NOTE: The setpoint used during the cool recovery period is the auxiliary relay contacts to control the economizer similar to the heat mode in Fig.
  • Page 21 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT T7350A,B,D,M SUBBASE T7350H SUBBASE LOAD LOAD AUXILIARY AUXILIARY RELAY RELAY CONTACT CONTACT (HOT) RELAY REQUIRED (R8222 OR SIMILAR). RELAY REQUIRED (R8222 OR SIMILAR). M19613 AUXILIARY TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS Fig. 14. Using T7350A,B,D,M models with an external AND OVERLOAD PROTECTION AS REQUIRED.
  • Page 22 De-energized Dehumidifies by operating cooling during typical off time. The one or less De-energized T7350 maintains the proper setpoint by running the heat at the same time. Auxiliary output during call for multiple cooling stages for two IMPORTANT reasons: At times during Reheat dehumidification, the T7350 1.

  • Page 23: Troubleshooting Guide (Table 19)

    Bad thermostat location. Relocate the thermostat. Display shows three dashes and a degree T7350 is set for remote sensing and sensor is missing or sign (all systems shut down). circuit is either open or shorted. Temperature settings will Upper or lower temperature limits were Check the temperature setpoints: not change.
  • Page 24 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.

  • Page 25: Wiring Diagrams (Fig. 17-25)

    T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT WIRING DIAGRAMS (FIG. 17-25) SUBBASE HEAT RELAY RELAY 1 COMPRESSOR HEAT CONTACTOR 1 RELAY 2 (HOT) (HOT) HEATING COOLING TRANSFORMER TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
  • Page 26 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT OUTDOOR AUX HEAT T7770 REMOTE SENSOR SENSOR STAGE 1 DISCHARGE COMPRESSOR SENSOR CONTACTOR 2 SUBBASE CHANGE RELAY OVER COMPRESSOR CONTACTOR 1 ECONOMIZER (HOT) (HOT) HEATING COOLING TRANSFORMER TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
  • Page 27 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT OUTDOOR HEAT T7770 REMOTE SENSOR SENSOR RELAY 2 DISCHARGE COMPRESSOR COMPRESSOR SENSOR CONTACTOR 4 CONTACTOR 2 SUBBASE W3/Y4 Y3 COMPRESSOR CONTACTOR 3 HEAT HUMIDITY MOTION RELAY RELAY 1 SENSOR SENSOR COMPRESSOR CONTACTOR 1 ECONOMIZER (HOT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
  • Page 28 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT MODULATING OUTDOOR COOL – T7770 REMOTE SENSOR (4-20 mA) SENSOR MODULATING DISCHARGE HEAT – (4-20 mA) SENSOR SUBBASE ® ORKS HEAT HUMIDITY MOTION RELAY RELAY 1 SENSOR SENSOR ® ORKS COMPRESSOR CONTACTOR 1 ECONOMIZER (HOT) HEATING...
  • Page 29 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT MODULATING OUTDOOR COOL – T7770 REMOTE SENSOR (4-20 mA) SENSOR MODULATING DISCHARGE HEAT – (4-20 mA) SENSOR SUBBASE HEAT HUMIDITY MOTION RELAY RELAY 1 SENSOR SENSOR COMPRESSOR CONTACTOR 1 ECONOMIZER (HOT) (HOT) HEATING COOLING TRANSFORMER TRANSFORMER POWER SUPPLY.

  • Page 30: Appendix - Pda Usage

    It is best to set the clock before downloading anything else to CONFIGURATION PROCEDURE the thermostat. Connect to the thermostat and set the clock. 1. Enter the T7350 PDA application. (See Fig. 27.) See Fig. 26. 2. If disconnected, the only usable functions are: a.
  • Page 31 (1) Access to the Advanced Navigation mode is NOTE: Novice navigation to the Dehumidification obtained using one of the following methods: screen is controlled based on the T7350 model (a)Tap the lower left “Menu” silk screen icon. and configured room humidity sensor status.
  • Page 32 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT T7350D T7350M Fig. 34. Outputs screen. 16. Make changes and tap “Next” to proceed to the Fan Fig. 32. Cooling Config(uration) screen. screen. 17. The Fan screen facilitates changes to: 12. Make changes and tap “Next” to proceed to the Heating a.
  • Page 33 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Fig. 40. Weekly Schedule Mode CopyDayTo. Fig. 36. Weekly Schedule screen. 20. Tap “Next” to proceed to the SetPoints screen. 21. The SetPoints screen facilitates changes to the: a. Default setpoints. b. Occupied Setpoint stops. c. Temporary Override duration.
  • Page 34 8. When finished with deletions, tap DONE. Weekly (Wkly) Schedule This function is used to upload/modify/download schedule sets for programming a T7350. This can be useful if you want to change only schedule settings. Fig. 44. Holiday modification screen. NOTE: The schedule can also be modified from within a given configuration.
  • Page 35 Only Available if user selected one or more of following: Dehumidification Reset, Dehumidification Minimum On, or Dehumidification Reheat. Config ID cannot handle Standby setpoints. Keypad users cannot set Occupied setpoints that violate Not Occupied setpoint relationship. The T7350 algo- rithm never allows the effective setpoint outside Not Occupied setpoints.
  • Page 36 Only Available if user selected one or more of following: Dehumidification Reset, Dehumidification Minimum On, or Dehumidification Reheat. Config ID cannot handle Standby setpoints. Keypad users cannot set Occupied setpoints that violate Not Occupied setpoint relationship. The T7350 algo- rithm never allows the effective setpoint outside Not Occupied setpoints.
  • Page 37 Only Available if user selected one or more of following: Dehumidification Reset, Dehumidification Minimum On, or Dehumidification Reheat. Config ID cannot handle Standby setpoints. Keypad users cannot set Occupied setpoints that violate Not Occupied setpoint relationship. The T7350 algo- rithm never allows the effective setpoint outside Not Occupied setpoints.
  • Page 38 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 21. Exceptions to Factory Defaults. T7350D T7350M Configuration Option T7350A T7350B T7350H1009 T7350H1017 Heat Output Stages Cool Output Stages Room Humidity Sensor None None Local Local Heat Throttling Range Cool Throttling Range Heat Integral Time...
  • Page 39 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 63-2605—5...
  • Page 40 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...

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