Honeywell T7350 User Manual

Commercial programmable thermostat

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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.

® U.S. Registered Trademark

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.

• Intelligent Fan™ feature energizes fan continuously in

the Occupied periods. Fan can also be configured for

conventional heat or electric heat fan operation.

• 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.

Features Available via PDA Configuration

• 365 day clock with holiday programming.

• Automatic Daylight Saving Time adjustments.

• Selectable dehumidification limit control.

• Modulating output configuration.

• Occupancy input to control standby setpoint.

• Additional standby period used in low traffic areas.

• Sequential start option.

• Discharge air high/low limits.

• Selectable recovery ramp.

• Ambient lockout (with outdoor sensor).

Specifications ...................................................................

Installation ........................................................................

Settings ............................................................................

Installer Setup ..................................................................

Programming .................................................................... 12

Operation .......................................................................... 15

Troubleshooting Guide (Table 16) .................................... 19

Wiring Diagrams (Fig. 13-19) ........................................... 20

Appendix - PDA Usage .................................................... 24

T7350

PRODUCT DATA

Contents

63-2605-2

Table of Contents

Summary of Contents for Honeywell T7350

Page 1: Table Of Contents
24 Vac commercial single zone heating, ventilating and air • Remote sensor capability for temperature (including conditioning (HVAC) equipment. The T7350 consists of a outdoor air and discharge air) and humidity sensors. thermostat and subbase. The thermostat includes the keypad •...
Page 2: Specifications
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 W7215, W7459. NOTE: To achieve the 48-hour power-loss clock retention, Humidity Sensors: H7621A,B,C; H7631A,B,C. the T7350 must be powered for at least 5 minutes. PDA Units: Palm™ V, M125, and i705 handhelds; TRGPro™ handheld; ZIRE™ 71 handheld; PDA System Requirements: TUNGSTEN™...
Page 4: Installation
If you have questions, call IMPORTANT Honeywell Customer Care Center at 1-800-468-1502. To avoid electrical interference, which can cause erratic performances, keep wiring runs as short as possible and do not run thermostat wires adjacent to Location the line voltage electrical distribution systems.
Page 5 T7770A T7770A T7770A T7770A T77770A T7770A T7770A M19607A Fig. 4. Nine T7770A Sensors providing temperature averaging network for T7350 Thermostat. M19606A Fig. 3. Four T7770A Sensors providing temperature averaging network for T7350 Thermostat. WIRES THROUGH WALL MOUNTING HOLES WALL ANCHORS...
Page 6 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 7 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 5. T7350D Subbase for Three-stage Heat, Table 6. T7350M Subbase for Three Stage Systems. Three-stage Cool Systems. Terminal Terminal Description Description — 24 VAC Cooling transformer. 24 VAC Cooling transformer. — 24 VAC Heating transformer.
Page 8: Settings
• program times and setpoints for heating and cooling, In heat mode, when set for conventional heat, the equipment • override the program temperatures, (i.e. plenum switch) could power the fan despite the T7350. • display present setting, • set system and fan operation, •...
Page 9: 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 10: Special Functions
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 4. Once the proper option is chosen, exit Installer Setup by a. To restore the factory defaults, press up pressing Run Schedule. down until the display indicates YES. 5. The display prompts SAV CFG (save configuration). If b.
Page 11 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 9. 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 12: 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 calendar 1.
Page 13: 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. Adjustment can be made with the sensor in override. Clearing Program Start Times 1.
Page 14 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 15: 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 16 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 NORMAL setpoint changes at a rate in degrees per hour depending on RECOVERY RAMP the outdoor air temperature.
Page 17 MinClRamp The T7350 can take advantage of an economizer by closing the auxiliary relay contacts to control the economizer OUTDOOR AIR minimum position potentiometer.
Page 18 Energized Dehumidifies by operating cooling during typical off time. The more than one De-energized T7350 maintains the proper setpoint by running the heat at the one or less De-energized same time. IMPORTANT Auxiliary output during call for multiple cooling stages for two...
Page 19: Troubleshooting Guide (Table 16)
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 20: Wiring Diagrams (Fig. 13-19)
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 16. 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 21 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT OUTDOOR T7770 REMOTE SENSOR COMPRESSOR SENSOR CONTACTOR 2 DISCHARGE HEAT SENSOR RELAY 2 SUBBASE HEAT RELAY RELAY 1 COMPRESSOR CONTACTOR 1 ECONOMIZER (HOT) (HOT) HEATING COOLING TRANSFORMER TRANSFORMER POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Page 22 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT OUTDOOR COMPRESSOR T7770 REMOTE SENSOR SENSOR CONTACTOR 2 DISCHARGE HEAT HEAT RELAY 3 RELAY 2 SENSOR 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 23 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) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Page 24: 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. 21.) See Fig. 20. 2. If disconnected, the only usable functions are: a.
Page 25 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT To configure a T7350: 1. From the opening screen, tap Select Existing Config. (See Fig. 22.) 2. Select the desired configuration. Fig. 24. Inputs screen. 8. Make changes and tap “Next” to proceed to the Cooling Config(uration) screen.
Page 26 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT 12. Make changes and tap “Next” to proceed to the Outputs (1) Mode (see Fig. 31). screen. 13. The Outputs screen facilitates changes to output NOTE:To remove a given event, change Mode to type(s). “None”. NOTE: When configured with an extra stage of heat or (2) Time (see Fig.
Page 27 Temporary Override duration. 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. NOTE: The schedule can also be modified from within a given configuration.
Page 28 Only Available if user selected one or more of following: Dehumidification Reset, Dehumidification Minimum On, or Dehumidification Reheat. Keypad/LCD 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.
Page 29 Only Available if user selected one or more of following: Dehumidification Reset, Dehumidification Minimum On, or Dehumidification Reheat. Keypad/LCD 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.
Page 30 Only Available if user selected one or more of following: Dehumidification Reset, Dehumidification Minimum On, or Dehumidification Reheat. Keypad/LCD 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.
Page 31 Only Available if user selected one or more of following: Dehumidification Reset, Dehumidification Minimum On, or Dehumidification Reheat. Keypad/LCD 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.
Page 32 T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT ZIRE and TUNGSTEN are trademarks of palmOne, Inc. HotSync and Palm OS are registered trademarks of PalmSource, Inc. Palm is a trademark of PalmSource, Inc. TRGPro is a trademark of HandEra, Inc. Automation and Control Solutions ACS Control Products Honeywell International Inc.

Honeywell T7350 User Manual

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