Honeywell T7300F/Q7300H Manual

Honeywell T7300F/Q7300H Manual

The Q7300H Subbase is a LonMark® certified device that provides networking capability for the T7300F Thermostat in a LonWorks® system using a transformer-coupled Free Topology Transceiver (FTT). The T7300F/Q7300H communicates with all LonMark®
devices including the following:

• Other T7300F/Q7300H Commercial Thermostat/Communicating Subbases.
• Excel 15 S7760A Command Display.
• Excel 10 W7750A,B Constant Volume Air Handler Unit (CVAHU) Controller.
• Excel 15 W7760A Building Manager.
• Excel 10 W7761A Remote Input/Output (RIO) Controller.

Honeywell T7300F/Q7300H Control Application

The T7300F/Q7300H Series 2000 Commercial Thermostats and Communicating Subbases control 24 Vac commercial single zone heating, ventilating and air conditioning (HVAC) equipment. In addition, the Q7300H can communicate schedule information and system instructions to other devices in a LonWorks® network. Fig. 2 shows a typical T7300F/Q7300H application in a three-stage heat and two-stage cool heat pump system. For additional T7300F/Q7300H hookups. Communicating subbases for T7300F Thermostats add value by allowing remote-site access—via telephone lines—for diagnostics, maintenance and monitoring. In addition, the T7300F can act as the user interface for on- site Excel 10 Controllers (after initial installation with Excel LonSpec™) without the need for a personal computer workstation. Through the T7300F/Q7300H Thermostat/Communicating Subbase, a building operator can control Excel 10 devices by setting occupancy schedules, setpoints and additional features.

Honeywell T7300F/Q7300H Control Provided

The Q7300H communicates with other network devices, or nodes, for the purpose of sharing data. Through the network, the T7300F/Q7300H sets and deletes schedules. Schedules can be bypassed by selecting Continuous Unoccupied or Temporary Override. By using network messaging, the Q7300H sets fan operation (ON, AUTO) and system mode (HEAT, COOL, AUTO, OFF, EM HEAT) designated by a remote T7300F. Schedules can be programmed for seven days with four designated periods per day; Occupied 1, Occupied 2, Unoccupied 1 and Unoccupied 2. In external schedule mode, the T7300F changes occupancy through a network-based scheduler. In local schedule mode, the T7300F changes occupancy through an internal scheduler. If the external schedule is not periodically updated, the T7300F defaults to the local schedule.

The T7300F/Q7300H is also able to provide time of day, temporary setpoint, bypass status and additional information to multiple Excel 10 devices by sending instructions from one T7300F/Q7300H to the Excel 10 devices. When the T7300F is configured to schedule temporary setpoint and effective bypass information for other devices, certain restrictions apply such as:

• When the T7300F is scheduling temporary setpoints for Excel 10 devices, the Excel 10 cannot adjust setpoints using the T7770 wall module.
• When the T7300F is providing effective bypass information to Excel 10 devices, the Excel 10 cannot change the bypass status using the T7770 wall module.

Honeywell T7300F/Q7300H Products Covered

This System Engineering manual describes how to apply the T7300F Thermostat and Q7300H Communicating Subbase and related accessories to typical applications.

Devices include:
T7300F Series 2000 Commercial Thermostat.
Q7300H Series 2000 Communicating Subbase.
Excel 15 W7760A Building Manager.

Excel 10 Controllers, as follows:
W7750A,B Constant Volume Air Handler Unit (CVAHU) Controller.
W7761 Remote Input/Output (RIO) Controller.

Other products:
Q7751A,B Bus Router.
Q7760A Serial LonTalk Adapter.
Q7740A,B FTT Repeaters.
209541B FTT Termination Module. 

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