Honeywell T7350 User Manual
Commercial programmable thermostat for single- or multi-stage conventional/heat pump systems
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T7350 Commercial Programmable Thermostat
FOR SINGLE- OR MULTI-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.
• Advanced configuration using TStatSpec software or
PDA.
• 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 .................................................................... 16
Operation .......................................................................... 19
Troubleshooting Guide (Table 19) ..................................... 25
Wiring Diagrams (Fig. 17-25) ........................................... 27
Appendix - PDA Usage ..................................................... 32
PRODUCT DATA
®
®
Space Comfort Profile
continued
Contents
3
6
62-2605-09
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Table of Contents
Related Manuals for Honeywell T7350
Summary of Contents for Honeywell T7350
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Page 1: Table Of Contents
24 Vac commercial single zone heating, ventilating and air • Auxiliary subbase contact typically interface with a conditioning (HVAC) equipment. The T7350 consists of a Honeywell Economizer System (for total rooftop thermostat and subbase. The thermostat includes the keypad control integration) or act as dehumidification output. -
Page 2: Ordering Information
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: 1. Your local Honeywell Environmental and Combustion Controls Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care... -
Page 3: Specifications
48 hours. Input: Temperature: 20K ohms. NOTE: To achieve the 48-hour power-loss clock Humidity: 0-10 Vdc. retention, the T7350 must be powered for at least Outdoor: 3000 PTC. 5 minutes. Discharge Air: 20K ohms. Communicating Model T7350H: Occupancy Sensor: Dry contact switching 30 Vdc at 1 mA. - Page 4 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT TStat Spec System Requirements: Accessories: Windows XP or Windows 7 Duct Discharge Air Sensors: C7041B (6 or 12 in. [152 or 305 mm]), PDA System Requirements: C7041C (18 in. [457 mm]), ® Palm OS : 3.5.x to 5.2.1 C7041J (12 ft.
- 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_temp_p SNVT_ obj_status SNVT_ temp_p Network Network Variables nv27 nvoUnitStatus Variables SNVT_hvac_status nviTimeSet nvoFileStat SNVT_ time_stamp SNVT_file_status nviSetpoint...
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Page 6: Installation
Contact your local waste management authority for or remote-mounted sensor. instructions regarding recycling and the proper disposal of an old control. If you have questions, call Honeywell IMPORTANT Customer Care Center at 1-800-468-1502. To avoid electrical interference, which can cause... - Page 7 TR21 TR21 TR21 TR21 TR21 M29257 Fig. 6. Nine TR21 Sensors providing a temperature averaging network for T7350 Thermostat. M29184 Fig. 4. Four TR21 Sensors providing a temperature averaging network for T7350 Thermostat. WIRES THROUGH WALL T7350 SUBBASE MOUNTING HOLES...
- 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 IMPORTANT 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.
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Page 11: Settings
Programming section for complete instructions on changing No Motion the setpoints. Not Occupied Fan On Fan Off Occupied Sensed In heat mode, when set for conventional heat, the equipment (i.e plenum switch) could power the fan despite the T7350. 63-2605—09... -
Page 12: Installer Setup
Lockouts do not allow adjustments on dehumidification high limit. Special keypresses are never locked out. Displays only when heat pump is selected. Values vary depending on the model. NOTE: The T7350 has serial communications to facilitate use of an installer configuration tool. More Temporary Standby... -
Page 13: Special Functions
CnfgID values are available online at: b. To cancel this option, ensure display indicates NO. http://customer.honeywell.com/t7350. 3. Press Run Schedule. A PDA or Honeywell's TStatSpec(TM) software can be used, Test Mode (Occupied/Not Occupied/ as well. Schedule Day) Follow these instructions for identifying the CnfgID values using TStatSpec: 1. - Page 14 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Save User Schedule (Info/Copy) Use the Test Mode to check the thermostat configurations and operation. To start the system test: Performing this operation saves the current schedule (including 1. Press Schedule Day, Occupied and Not Occupied holidays) to memory, overwriting the old saved schedule: simultaneously.
- Page 15 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.
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Page 16: Programming
— Holidays must be first programmed with a PDA or through TStatSpec software. Holiday — Day-of-Week mode forces the T7350 to ignore holidays. Only applies to holidays programmed with 365-day calendar With holidays set, holiday schedule times can be changed using the keypad: NOTE: 12:00 PM is Noon, and 12:00 AM is Midnight. -
Page 17: Copying A Day
The Temporary Occupied Override can be used when the by Occupied Cool Setpoint – 2° F (1° C). T7350 is in Not Occupied or Standby mode. It switches to the The Minimum Occupied Cool Setpoint is limited by Occupied mode for a fixed number of hours. - Page 18 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 1. To use the default occupied override, press Temporary NOTES: Occupied. — If the number of days is set to zero, no temporary change takes effect. NOTE: The default temperature setting is the — If the number of days is set just below zero, the Occupied setpoint.
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Page 19: Operation
Equipment Protection T7350 Relay Logic As part of the operational sequence, the T7350 All T7350 model thermostats contain four switching relays. In microprocessor incorporates cycle rate, and minimum on and conventional applications, the relays control first stage cooling, off times for all heating and cooling stages. This extends first stage heating, fan, and auxiliary. - Page 20 Recovery Ramping Logic NORMAL RECOVERY RAMP AUX HEAT The T7350 incorporates a ramping feature that gradually STAGE 2 RAMP changes the space setpoints. During recovery operation, the NOT OCCUPIED AUX HEAT setpoint changes at a rate in degrees per hour depending on...
- Page 21 The T7350 can take advantage of an economizer by closing • Comfort and energy savings can be achieved in both the auxiliary relay contacts to control the economizer minimum heating and cooling.
- Page 22 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT T7350A,B,D,M SUBBASE Table 16. Auxiliary Relay Logic (Economizer and TOD) Occupancy Auxiliary Contacts LOAD Motion Scheduled Effective Sensor Economizer AUXILIARY Period Occupancy RELAY Signal CONTACT Occupied Sensor Occupied Closed Closed Wired RELAY REQUIRED (R8222 OR SIMILAR).
- Page 23 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 17. Default Auxiliary Relay Operations. Heat Pump or Contact Not Used Conventional as Heat or Cool Stage Contact Configuration of Contact Not Used as Stage Heat Pump --terminal, between W1 Simple Simple Time of Day...
- Page 24 De-energized REHEAT Dehumidifies by operating cooling during typical off time. The High one or less Energized T7350 maintains the proper setpoint by running the heat at the more than one De-energized same time. one or less De-energized IMPORTANT...
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Page 25: 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 26 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.
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Page 27: 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 28 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT TR23 REMOTE SENSOR OUTDOOR AUX HEAT SENSOR STAGE 1 10 11 12 DISCHARGE COMPRESSOR CONTACTOR 2 SENSOR 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 29 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT TR23-H REMOTE SENSOR OUTDOOR HEAT SENSOR RELAY 2 10 11 12 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...
- Page 30 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT TR23-H REMOTE SENSOR MODULATING OUTDOOR COOL – (4-20 mA) SENSOR MODULATING 10 11 12 DISCHARGE HEAT – (4-20 mA) SENSOR SUBBASE LONWORKS ® HEAT HUMIDITY MOTION RELAY 1 RELAY SENSOR SENSOR LONWORKS ® COMPRESSOR CONTACTOR 1...
- Page 31 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT TR23-H REMOTE SENSOR MODULATING OUTDOOR COOL – (4-20 mA) SENSOR MODULATING 10 11 12 DISCHARGE HEAT – (4-20 mA) SENSOR SUBBASE HEAT HUMIDITY MOTION RELAY RELAY 1 SENSOR SENSOR COMPRESSOR CONTACTOR 1 ECONOMIZER (HOT) (HOT) HEATING...
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Page 32: Appendix - Pda Usage
Disconnect the TIM cable prior to opening or closing CONFIGURATION PROCEDURE the thermostat cover. 1. Enter the T7350 PDA application. (See Fig. 27.) Setting Clock 2. If disconnected, the only usable functions are: a. New Config: It is best to set the clock before downloading anything else to (1) Enter a name for the configuration. - Page 33 Novice navigation screens (that appear), or NOTE: Novice navigation to the Dehumidification b. Advanced navigation screens, using the hidden screen is controlled based on the T7350 model menus. (These are designed for expert users.) and configured room humidity sensor status.
- Page 34 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 12. Make changes and tap “Next” to proceed to the Heating Config(uration) screen. 13. The Heating Config(uration) screen facilitates changes a. Number of Stages. b. Heating Response. c. OAT Lockout and DAT High Limit Setpoints (for some models).
- Page 35 Weekly (Wkly) Schedule This function is used to upload/modify/download schedule sets Fig. 40. Weekly Schedule Mode CopyDayTo. for programming a T7350. This can be useful if you want to change only schedule settings. 20. Tap “Next” to proceed to the SetPoints screen.
- Page 36 Start Month. This function is used to upload/modify/download holiday sets for programming a T7350. This can be useful if you want to NOTE: To remove a given holiday, change the Start change only holiday settings. It is especially useful if you use Month to “None”...
- Page 37 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 20. Thermostat Setup Options Through PDA. Factory Configuration Option Default Tool CnfgID Description Fan Operation Conventional Conventional: Applications where equipment controls fan operation in heat mode. Electric Heat: Applications where thermostat controls fan operation in heat mode.
- Page 38 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 20. Thermostat Setup Options Through PDA. (Continued) Factory Configuration Option Default Tool CnfgID Description RoomTemp Local Room Temperature Input Local: Use internal sensor; TR21/TR24: Use remote sensor. TR22/TR23: Use remote sensor with setpoint adjustment capability (requires PDA or TStatSpec software and USB-TIM/U cable).
- Page 39 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 20. Thermostat Setup Options Through PDA. (Continued) Factory Configuration Option Default Tool CnfgID Description Dehumidification Minimum on time used with “Dehumidify Minimum On”. Range: 5 to 15 Min On Time minutes. Dehumidification None None: No Reset dehumidification; Enable: Dehumidification using Reset.
- Page 40 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 algorithm never allows the effective setpoint outside Not Occupied setpoints. Table 21. Exceptions to Factory Defaults T7350D...