HONEYWELL T7300F Programmable Thermostat User Manual

HONEYWELL T7300F Programmable Thermostat

INTRODUCTION

Description of Devices
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). See Fig. 1. The T7300F/Q7300H communicates with all LonMark® devices including the following:

• ¾ 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.

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, see Fig. 13, 15, 16.

Fig. 1. Typical T7300F/Q7300H LonWorks® network diagram

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION INSTRUCTIONS.
3. USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED IN OCCUPIED MODE.
4. CONNECT GND TO EARTH GROUND.

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 onsite 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.

Control Provided

Part Number	Product Description
Q7300H2003	Communicating subbase with O and B terminals for three-stage heat, two-stage cool heat pump system.
Q7300H2011	Communicating subbase without O and B terminals for three-stage heat, two- stage cool heat pump system.
Q7300H2029	Communicating subbase for three-stage heat, three-stage cool conventional system.
Q7300H2037	Communicating subbase for two-stage heat, one-stage cool conventional system with valve two-position heat output.
T7300F2002	Series 2000 Commercial Electronic Thermostat without system and fan switching.
T7300F2010	Series 2000 Commercial Electronic Thermostat with system and fan switching.

The Q7300H communicates with other network devices, or nodes, to share 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 a 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, 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.

Product Names
When combined with the T7300F Series 2000 Commercial Thermostat, the Q7300H Communicating Subbase communicates with other devices in a LonWorks® network. The thermostat and subbase are available in the following models:

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 LonTalkÒ Adapter.
  • Q7740A, B FTT Repeaters.
  • 209541B FTT Termination Module.
  • See Table 1 for additional products.

Organization of Manual
This manual is divided into four basic sections:

1. Introduction. Provides an overview of the T7300F/Q7300H discusses related devices, lists additional literature, and provides a glossary of abbreviations and terms.
2. Construction. Describes T7300F/Q7300H features, network connections, and dimensions.
3. Application Steps. A step-by-step procedure that provides the information necessary to plan and lay out the T7300F/Q7300H application and accurately order materials.
4. Appendix. Appendix A provides a sequence of operations for configuring network controllers. The organization of the manual assumes a project is being engineered from start to finish. If you are changing an existing system, refer to the Table of Contents for relevant sections.

Table 1. Additional Products

Part Number	Product Description	Comments
R8242A	Contactor, 24 Vac coil, DPDT.	—
AT72D, AT88A, etc.	Transformers.	—
4074EYD	Wallplate for T7770 Wall Modules.	For covering an existing hole in a wall.
—	Serial Interface Cable, male DB-9 to female DB-9 or female DB-25.	Obtain locally from any computer hardware vendor.
Honeywell (US only) AK3791 (one twisted pair) AK3792 (two twisted pairs).	LonWorks® Bus (plenum): 22 AWG (0.325 sq mm) twisted pair solid conductor, nonshielded or EchelonÒ approved shielded cable.	Level IV, 140°F (60°C) rating.
Honeywell (US only) AK3781 (one twisted pair) AK3782 (two twisted pairs).	LonWorks® Bus (nonplenum): 22 AWG (0.325 sq mm) twisted pair solid conductor, nonshielded or EchelonÒ approved shielded cable.	Level IV, 140°F (60°C) rating.
Honeywell AK3725 (US only), typical or equivalent.	Inputs: 18 AWG (1.0 sq mm) five wire cable bundle.	Standard thermostat wire.
Honeywell AK3752 (US only), typical or equivalent.	Outputs/Power: 14 to 18 AWG (2.0 to 1.0 sq mm).	NEC Class 2, 140°F (60°C) rating.
Honeywell AK3702 (US only), typical or equivalent.	18 AWG (1.0 sq mm) twisted pair.	Non-plenum.
Honeywell AK3712 (US only), typical or equivalent.	16 AWG (1.3 sq mm) twisted pair.	Non-plenum.
Honeywell AK3754 (US only), typical or equivalent.	14 AWG (2.0 sq mm) two conductor.	Non-plenum.

Applicable Literature
The following list of documents contains general information related to the T7300F/Q7300H Series 2000 Commercial Thermostats and Communicating Subbases.

Form No.	Title
62-0125	T7300F Series 2000 Commercial Microelectronic Conventional or Heat Pump Thermostat Installation Instructions
62-0155	Q7300H Series 2000 Commercial Thermostat Installation Instructions
74-2976	Excel LonSpec™ Specification Data
74-2977	Excel LonSpec™ Software Release Bulletin
74-2937	Excel LonSpec™ User’s Guide
74-2982	Light Commercial Building Solutions System Specification Data
74-2865	E-Bus Wiring Guidelines User’s Guide
74-2967	Excel 15 W7760A Building Manager Specification Data
95-7565	Excel 15 W7760A Building Manager Installation Instructions
74-2969	Excel 15 W7760A Building Manager System Engineering
74-2956	Excel 10 W7750A,B CVAHU Controller Specification Data
95-7521	Excel 10 W7750A,B CVAHU Controller Installation Instructions
74-2958	Excel 10 W7750A,B CVAHU Controller System Engineering
74-2698	Excel 10 W7761A RIO Controller Specification Data
95-7539	Excel 10 W7761A RIO Controller Installation Instructions
74-2699	Excel 10 W7761A RIO Controller System Engineering
74-2697	T7770A, B, C, D, E, F, G Wall Module Specification Data
95-7538	T7770A, B, C, D, E, F, G Wall Module Installation Instructions
95-7554	209541B Termination Module Installation Instructions

Agency Listings
European Community Mark (CE): Conforms to requirements of European Consortium Standards.

ABBREVIATIONS AND DEFINITIONS

Application—A specific Building Control function.
Binding—The process of logically connecting network
variables in one node to network variable(s) in another node (s). Binding is performed by a network management node that writes the binding information into the EEPROM memory of all the neurons involved. The binding information is saved in the network image of each neuron.
Building Manager—A LonMark® certified device that can be used to monitor and control HVAC equipment and other miscellaneous loads in a distributed network.
Command Display—A device that can be used to monitor and change parameters.
Control Loop—A primitive control function. A type of function in a node that includes processes, loops, and programs. A node can contain one or more control loops. (In Excel 10 class devices, the control loop occupies the entire node.)
CVAHU—Excel 10 Constant Volume Air Handler Unit Controller.
Excel 10s—A family of application-specific HVAC controllers such as Excel 10 CVAHU and Excel 10 RIO.
HVAC—Heating, Ventilating, and Air Conditioning.
I/O—Input/Output LonWorks® Network—A data network based on neurons communicating with each other using the LonTalk® protocol.
Mandatory Mechanisms/Objects/Network Variables—
Mandatory mechanisms and network variables are implemented in all Excel 10 devices.
NamedObject—Objects that have names are called NamedObjects. These objects are visible on the network as functional independent entities and are accessed by name. Typical examples of NamedObjects are Controllers, ControlLoops, and LogicFunction blocks.
Network Management Node—A LonWorks® node that is responsible for configuring the network, installing the nodes, binding the network variables between nodes, and general network diagnostics.

Network Variables—A class of variables defined in Neuron C allows communication over the LonWorks® network to other nodes on the network. An output network variable in one node can be bound to the corresponding input network variable(s) in another node (s). Changing the value of the output network variable in one node causes the new value to be automatically communicated to the bound input network variable(s) in another node (s). When an input network variable is updated, a nv_update_occurs event is posted at the receiving node(s) so that the application program can take action based on the change. A network management node that explicitly reads and/or writes the network variable can also poll network variables. Network variables can contain one data field (one or two bytes) or multiple data fields (a structure).

Node—A device implementing layers one through six of the LonTalk® protocol including a Neuron® Chip, transceiver, memory, and support hardware.

Notebook PC—Portable personal computer. Optional Mechanism/Object/Network Variables— Optional mechanisms and variables that shall be implemented on an as-needed basis. However, a different mechanism or network variable cannot be implemented if an existing optional mechanism or network variable can perform the same function.

Programmable Controller—A controller that has a variable number of control loops of different types and is user-programmed to execute an application. The user can select the number and type of control loops. The user also has the capability of generating new types of control loops. Recovery Mode or Recovery Period—The time in unoccupied periods when the temperature control is adjusting the control setpoint so that the space the temperature reaches the occupied setpoint when the schedule change occurs.

RIO—Excel 10 Remote Input/Output device.
RTC—Real Time Clock. Schedule—The structure that defines the occupancy states, setpoints, and the time of the changes between these states.
SGPU—Significant Event Notification and Guaranteed Periodic Update.
SGPUC—Significant Event Notification and Guaranteed Periodic Update with Change Field.
SLTA—Serial LonTalk® Adapter. Adapts the transformer coupled LonTalk® messages to the RS-232 Serial Port.
SNVT—Standard Network Variable Type.
SCPT—Standard Configuration Parameter Type.

CONSTRUCTION

The T7300F Thermostat has a keypad for setting system parameters, a corresponding LCD, and a flip-down keypad cover. The T7300F Thermostat mounts on the Q7300H Subbase. The Q7300H Communicating Subbase includes LonWorks® Bus terminals and a jack for temporary network connections to a personal computer. A service pin push button provides service messaging to physically locate the device on the LonWorks® network. The sub-base mounts horizontally on the wall or a 2 in. x 4 in. junction box. Fig. 3 shows T7300F/Q7300H dimensions.

Performance Specifications

Electrical Ratings:
Power: 20 to 30 Vac, 50/60 Hz.
System Current: 6 VA maximum at 30 Vac, 50 or 60 Hz.

Temperature Ratings:
Setpoint Range: Heating: 40°F to 90°F (4°C to 32°C;
Cooling: 45°F to 90°F (7°C to 32°C).
Operating: 40°F to 110°F (4°C to 43°C).
Shipping: -20°F to +130°F (-29°C to +54°C).
Display Accuracy: ±1°F (+0.5°C).

Differential:
2°F (1°C).

Humidity Ratings:
5% to 90% RH, non-condensing.

Input/Output Summary
Table 2 summarizes the T7300F/Q7300H
Thermostat/Subbase inputs and outputs.

Table 2. Terminal descriptions and conditions

Standard Terminal Designations	Typical Connection	Function	Terminal Type
A1, A3	Damper control relay. See T7300F Installation Instructions, form 69-1025-3, installer setup 18, for control parameters.	Output	Dry contract
A2	Dry auxiliary contact. (A2 is common to A1, A3.)	Input	—
AS,AS	C7150B Discharge Air Sensor connection.	Input	—
B	Heating changeover valve.	Output	24V powered contact
BM	ML7984 Actuator connection. No call for heat; valve closed during occupied periods and open during unoccupied periods.	Output	—
C1, C2, C3, C4, C5	Communication input for T7147.	Input/Output	Low power
E	Emergency heat relay.	Output	24V powered contact
EB, EB	LonWorks® Bus connection to LonWorks® network.	Input/output	Communications
FC	Fan control transformer.	Input	—
G	Fan relay.	Output	—
GH	High speed fan output. Activated during call for cooling.	Output	—
GL	Low speed fan output. Activated on call for heat and fan On selection.	Output	—
O	Cooling changeover valve.	Output	—
P1, P2	Pump interlock relay. Operates circulator pump in hydronic heat or energizes conventional heat system.	Input, output	—
R	24V system transformer.	Input	—
RC	24V cooling transformer.	Input	—
RH	24V heating transformer.	Input	—
RM	ML7984 Actuator connection. No call for heat; valve closed. Call for stage 1 heat; valve approximately one-half open. Call for stage 2 heat; valve fully open.	Output	—
T, T	Remote sensor input for T7047 or T7147.	Input	—
W1	Stage 1 heating relay or auxiliary heat relay.	Output	—
W2	Stage 2 heating relay	Output	—
W3	Stage 3 heating relay	Output	—
X	Heating transformer common.	Input	—
Y	Cool call.	24V output on Y	—
Y1	Stage 1 compressor contactor.	Output	—
Y2	Stage 2 cooling compressor (conventional). Stage 2 compressor contactor (heat pump).	Output	—
Y3	Stage 3 cooling compressor.	Output	—

Communications

The Q7300H provides networking capability in a LonWorks® system when using a Free Topology Transceiver (FTT) transformer-coupled communications port running at 78 kilobits per second (KBS). The transformer-coupled communications interface offers a much higher degree of common-mode noise rejection while ensuring dc isolation. LonWorks® FTT networks are very flexible and convenient to install and maintain, but it is imperative that the network layout be carefully planned and accurate documentation created and maintained. This aids in compliance verification and future expansion of the network. It also minimizes unknown or inaccurate wire run lengths, node to- node (device-to-device) distances, node counts, total wire length, inaccurate repeater/router locations, and misplaced or missing terminations. LonWorks® networks can be configured in a variety of ways; refer to the E-Bus FTT Network Wiring Guidelines, form 74-2865-1, for a complete description of network topology rules and maximum wire length. If longer runs are required, add a Q7740A 2-way or Q7740B 4-way repeater to extend the LonWorks® Bus length. Add a Q7751A to partition the system into two segments to double the length of the LonWorks® Bus.

Approved cable types for LonWorks® Bus
communications wiring are Level IV, 22 AWG (0.34 sq mm) plenum or non-plenum rated unshielded, twisted pair, solid conductor wire. For non-plenum areas, use US part AK3781 (one pair) or US part AK3782 (two pairs). In plenum areas, use US part AK3791 (one pair) or US part AK3792 (two pairs). Other EchelonÒ approved cables may also be used. Run communications wiring in a conduit, if needed, with non-switched 24 Vac or sensor wiring. The Free Topology Transceiver (FTT) communications LonWorks® Bus supports a polarity insensitive, free
topology wiring scheme that, in turn, supports star, loop, and/or bus wiring.

LonMark® Functional Profile
The Q7300H supports the LonMark® Functional Profile
Number 8060, Thermostat Object (Type 09). See Fig. 4.

NOTE: For additional information on the LonMark® Functional Profile, see the LonMark® Application Layer Interoperability Guidelines and the LonMark® Functional Profile: Thermostat. Both documents are available from LonMark® at the Internet address: www.lonmark.org.

CONFIGURATIONS

General
The T7300F/Q7300H can be configured to perform a variety of activities in which data is sent to and/or received from other nodes on the LonWorksÒ network. Information that can be shared with other network devices includes:

• Day-of-week and time-of-day
• System mode (HEAT, COOL, AUTO, OFF, EM HEAT)
• Current fan setting (ON, AUTO)
• Space temperature
• Current setpoint
• Occupied/Unoccupied schedule commands
• Current occupancy status
• Relay status (heat/cool stages and fan)
• Alarm status
• Alarm log

A network configuration tool is used to configure Q7300Hs and other nodes with which the Q7300H interacts. The following is a brief description of the configurable features that can be commanded over the network:

Day-of-Week/Time-of-Day
When a T7300F Thermostat is designated as the network time master, the current time of day, and the day of the week is synchronized across the network every minute. Whenever the time of day or day of the week of the time master is changed, it automatically adjusts all the other T7300Fs on the network. When a T7300F is controlled by a time master, its time cannot be changed using its keypad. If an attempt is made to change its time, the controlled T7300F LED displays LOC.

System Switch Settings
System switch settings (HEAT, COOL, AUTO, OFF, EM HEAT) can be designated by a remote T7300F, or if configured to allow it, from the T7300F keypad.

Fan Settings
Fan settings (ON, AUTO) are selected as designated by a remote T7300F, or from the T7300F keypad.

Space Temperature
If a valid space temperature value is received at the Q7300H DestRmTemp network variable input, the value will be used in the T7300F as the primary controlled variable. In this case, the internal space of the sensor of the T7300F is ignored.

Current Setpoint:
If a valid setpoint value is received at Q7300H DestSetPoint, that value will be used by Q7300H as the center setpoint. The heat and cool setpoints are then calculated from this value and are used in the T7300F as the occupied setpoints. During unoccupied periods, DestSetPoint is ignored.

Schedule

The occupancy schedule used by a T7300F may reside locally in that device or remotely in another scheduled device (T7300F or Excel 15). Local schedules can be created and modified using the T7300F keypad, or with a configuration tool. External schedules can also be modified using the keypad of the scheduling device, or with a configuration tool. When a T7300F receives
scheduling information over the network, the user is locked out from making schedule changes at the keypad and the LCDs LOC if attempted. When a T7300F Thermostat is designated as a scheduling device, it sends its schedule file to the appropriate Q7300H(s) which, in turn, overwrites any existing internal schedule in their T7300F Thermostat. The T7300F/Q7300H Thermostat/Subbase can provide scheduling information to multiple Excel 10 devices by taking instruction from one T7300F/Q7300H and sharing the information with the desired Excel 10 devices.

• Occupancy Bypass:
  Any internal schedule in the T7300F is overridden if a valid occupancy command is received by its Q7300H (resulting from an existing external schedule on the LonWorksÒ network).
• Continuous Unoccupied:
  In this mode, the T7300F Thermostat sets the operating setpoints to the unoccupied setpoints. The T7300F remains in this mode until the Run Program key is pressed.
• Setpoint Changes:
  Selecting a temporary setpoint modifies that setpoint for the present schedule period. Pressing Run Program terminates temporary setpoints. The temperature setpoint range is 40°F to 90°F (4°C to 32°C).
• Temporary Override:
  Modifies the schedule to operate the thermostat in the occupied mode for a designated number of hours. Temporary occupied time can be selected for 1, 3, 8 or 12 hours. If a change from occupied to unoccupied is scheduled and the Temporary Override key is pressed, the thermostat remains in occupied mode until the designated override time expires. If the thermostat is in the unoccupied mode when the Temporary Occupied key is pressed, the thermostat operates at the override time expires.

APPLICATION STEPS
Overview
The application steps shown in Table 3 are guidelines for configuring the T7300F/Q7300H Thermostat/Subbase in a LonWorks® Bus network and explain the network role of the T7300F/Q7300H.

Table 3. Application Steps

Step	Description
1	Plan the system.
2	Determine required network devices.
3	Lay out communications and power wiring.
4	Prepare wiring diagrams.
5	Order equipment.
6	Configure T7300F/Q7300H.
7	Troubleshooting.

Step 1. Plan the System

the use of the T7300F/Q7300H Thermostat/Subbase according to the job requirements. Determine the location and functionality. Verify the sales estimate for the number of other controllers and devices required. Check the number and type of other required accessories. When planning the system layout, consider potential expansion possibilities for future growth. Planning is very important if HVAC systems and controllers are to be added to future projects.

Refer to the E-Bus Wiring Guidelines, form 74-2865 for a complete description of network topology rules. See Application Step 3. Lay Out Communications and Power Wiring, for more information on bus wiring layout and Fig. 6 through 10 in Application Step 4. Prepare Wiring Diagrams, for wiring details. Refer to the Excel LonSpec™ User Guide, form 74-2937,
to configure the W7760A Building Manager, W7750A,B , and W7761 Controllers, and the Q7300H Subbase.

Step 2. Determine Required Network
Devices
A maximum of 60 nodes can communicate on a single LonWorksÒ Bus segment. Each LonWorksÒ Bus device comprises one node. If more than 60 nodes are needed, a Q7751A Router or Q7740 Repeater is necessary. In a network with Excel 15 devices, a router allows up to 120 controller nodes per network, divided between two LonWorksÒ Bus segments. A router or repeater allows up to 120 controller nodes per network, divided between two LonWorksÒ Bus segments. The router comprises two nodes (one node on each side of the router). Router and
operator access nodes are not counted in the maximum controller node totals. All devices can talk to each other through the router.

Multiple operator terminals can be connected to the LonWorksÒ Bus at the same time. Table 4 summarizes the LonWorksÒ Bus segment configuration rules. Refer to the E-Bus Wiring Guidelines, form 74-2865, for a complete description of network topology rules and maximum wire lengths. If longer runs are required, use a Q7740A 2-way or Q7740B 4-way repeater to extend the length of the LonWorksÒ Bus. Each network segment can only have one repeater. If more nodes or longer distances are required, add a router or repeater to limit bus traffic or
boost distance.

In addition, a 209541B Termination Module may be required. Refer to the E-Bus Wiring Guidelines, form 74- 2865, and the Excel 10 FTT Termination Module Installation Instructions form, 95-7554, or if Excel 15s are present, see Application Step 3. Lay Out Communications and Power Wiring in the W7760A System Engineering Guide, form 74-2969.

Step 3. Lay Out Communications and Power Wiring
LonWorks® Bus Layout
The communications LonWorksÒ Bus is a 78-kilobit network that uses transformer isolation and differential Manchester encoding. The Free Topology Transceiver (FTT) LonWorksÒ
communications Bus supports a polarity insensitive, free topology wiring scheme, refer to the E-Bus Wiring Guidelines form, 74-2865, for a complete description of LonWorksÒ network topology rules. Fig. 6 shows a typical wiring diagram for the T7300F/Q7300H in a LonWorks® network. Fig. 7 and 8 show wiring layouts for two doubly daisy-chained LonWorksÒ Bus segments.

Table 4. LonWorksÒ Bus Configuration Rules and Device Node Numbers.

One LonWorksÒ Bus Segment	Maximum Number of Controller Nodes 60
Maximum number of Excel 10s	60 nodes (minus number of Excel 15s)
Maximum number of Excel 15s	4 nodes
Total	60 nodes maximum
Two LonWorksÒ Bus Segments; with Excel 15 Controllers, more than 60 devices	Maximum Number of Controller Nodes 112, plus two nodes for router access.
One Q7751A,B Router	2 nodes
Maximum number of Excel 15s	8 nodes
Maximum number of Excel 10 RIO devices	24 nodes
Maximum number of Excel 10s (20 per each Excel 15)	112 nodes (minus number of RIOs)
Total	122 nodes maximum
Two LonWorksÒ Bus Segments; without Excel 15 Controllers, more than 60 devices	Maximum Number of Controller Nodes 120, plus two nodes for router access.
One Q7751A,B Router	2 nodes
Maximum number of Excel 10s (60 per segment)	120 nodes
Total	122 nodes maximum

Fig. 6. Typical topology for T7300F/Q7300H devices in LonWorksÒ network

Cable Termination
The FTT network segment requires termination for proper data transmission performance. Use a 209541B Termination Module to connect two of the three termination module wires to the LonWorksÒ Bus terminals.

Singly Terminated Network Segment
In a singly terminated topology segment, only one termination is required and can be placed anywhere on the segment. Singly terminated segments use the yellow and brown wires. Mount the termination modules on the appropriate terminals as shown in Fig. 9.

Doubly Terminated Daisy
Chain Network Segment In a doubly terminated daisy-chained topology segment, two terminations are required, one at each end of the topology segment. Doubly terminated segments use the orange and brown wires. Mount the termination modules on the appropriate terminals as shown in Fig. 10. For additional wiring information, refer to the E-Bus Wiring Guidelines form 74-2865, and the Excel 10 FTT Termination Module Installation Instructions form 95-7554.

CAUTION
Electrical Shock Hazard. The power supply can cause electrical shock. Disconnect the power supply before beginning installation. Loosen the terminal screws on the sub-base and connect the system wires. See Fig. 11.

IMPORTANT
Use an 18-gauge, solid-conductor color-coded thermostat cable for proper wiring. If using 18-gauge stranded wire, do not use more than two wires. Do not use larger than 18-gauge wire. Securely tighten each terminal screw. Push excess wire back into the hole. Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
NOTE: After wiring, check that all connections are tight and secure. See Fig. 11. Loose or intermittent wire connections can cause inconsistent system operation.

Wiring Details

LonWorks® network cable should be wired separately from the power and I/O wires when installing Q7300s. If this is not possible, use a minimum of 4 in. (102 mm) the separation between split ferrite cores (Fair-Rite 0443164151, or equivalent Honeywell part no. 229997CB, containing five split ferrite cores) to ensure compliance with Class B limits (does not apply to Class A limits). See Fig. 12. to apply ferrite cores to LonWorks® Bus input and output.

Step 4. Prepare Wiring Diagrams
Fig. 13 through 16 show T7300F/Q7300H terminal arrangements and provide detailed wiring diagrams. Reference these diagrams to prepare the site-specific job drawings.

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED IN OCCUPIED MODE.
3. USE A2 AND A3 WHEN CONTACTS ARE NORMALLY OPEN IN OCCUPIED MODE. CONNECT GND TO EARTH GROUND.
4. USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS

Fig. 13. Typical hookup of T7300F/Q7300H in three-stage heat, two-stage cool heat pump system (without O/B terminals).

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION INSTRUCTIONS.
3. USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED IN OCCUPIED MODE.
4. CONNECT GND TO EARTH GROUND.

Fig. 14. Typical hookup of T7300F/Q7300H in three-stage heat, two-stage cool heat pump system (with O/B terminals).

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. JUMPER RC TERMINAL TO RH TERMINAL WHEN INSTALLED ON A SYSTEM WITH ONE TRANSFORMER.
3. USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED IN OCCUPIED MODE. USE A2 AND A3 WHEN CONTACTS ARE NORMALLY OPEN IN OCCUPIED MODE.
4. CONNECT GND TO EARTH GROUND.
5. USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS

Fig. 15. Typical hookup of T7300F/Q7300H in three-stage heat, three-stage cool conventional system.

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
2. CONNECT GND TO EARTH GROUND.
3. SEE TABLE 2 FOR VALVE AND VALVE ACTUATOR MODELS

Fig. 16. Typical hookup of T7300F/Q7300H in two-stage heat, one-stage cool conventional system.

General Considerations

Table 5 lists wiring types, sizes, and distances for the T7300F/Q7300H and Excel 10 products. The Q73000H accepts 14 through 22 AWG (2.0 to 0.34 sq. mm wire).

Table 5. Field Wiring Reference Table.

Wire Function	Recommended Wire Size (Minimum)	Construction	Specification or Requirement	Vendor Wire Type	Distance (Maximum)
Thermostat wire.	Inputs: 18 AWG (1.0 sq mm) five wire cable bundle.	Standard thermostat wire.	¾	Honeywell AK3725 (US only), typical or equivalent.	¾
Thermostat	Outputs/Power:	NEC Class 2, 140°F	Level IV, 140°F	Honeywell AK3752	¾
wire.	14 to 18 AWG	(60°C) rating.	(60°C) rating.	(US only), typical or
	(2.0 to 1.0 sq mm).			equivalent.
LonWorksÒ	22 AWG	Twisted pair solid	Level IV, 140°F	Honeywell AK3781	Refer to E-bus
Bus (Non- Plenum).	(0.34 sq mm)	conductor, nonshielded or	(60°C) rating.	(one twisted pair), AK3782 (two twisted	Wiring guidelines Users Guide
		Echelon® approved cable.		pair).	74-2865-1 for maximum length.
Power	14 AWG	Any pair nonshielded	NEC Class II,	Honeywell AK3754	Limited by line-loss
Wiring.	(2.0 sq mm)	(use heavier wire for longer runs).	140°F (60°C) rating.	(14 AWG) twisted pair), AK3909	effects on power consumption.
				(14 AWG) single
				conductor or
				equivalent.

Step 5. Order Equipment

Part Number	Product Description	Comments
Q7300H2003	Communicating subbase with O and B terminals for three-stage heat, two-stage cool heat pump system.	Includes AS terminals for optional discharge air sensing; A1, A2, A3 terminals for optional economizer.
Q7300H2011	Communicating subbase without O and B terminals for three-stage heat, two-stage cool heat pump system.	Includes AS terminals for optional discharge air sensing; A1, A2, A3 terminals for optional economizer.
Q7300H2029	Communicating subbase for three-stage heat, three-stage cool conventional system.	Includes AS terminals for optional discharge air sensing; A1, A2, A3 terminals for optional economizer.
Q7300H2037	Communicating subbase for two-stage heat, one-stage cool conventional system with valve two-position heat output.	Includes AS terminals for optional discharge air sensing; A1, A2, A3 terminals for optional economizer.
T7300F2002	Series 2000 Commercial Electronic Thermostat without system and fan switching.	Use with Q7300H Communicating Subbase for network communications.
T7300F2010	Series 2000 Commercial Electronic Thermostat with system and fan switching.	Use with Q7300H Communicating Subbase for network communications.
W7750A,B	Excel 10 Constant Volume Air Handler Unit.	Single-speed fan provides continuous supply air to designated area.
W7761A	Excel 10 Remote Input/Output Device.	Service messaging feature identifies physical location of specific Excel 10s on network.
—	Serial Interface Cable, male DB-9 to female DB-9 or female DB-25.	Obtain locally from any computer hardware vendor.
Honeywell (US only) AK3791 (one twisted pair) AK3792 (two twisted pairs).	LonWorksÒ Bus (plenum): 22 AWG (0.325 sq mm) twisted pair solid conductor, nonshielded or EchelonÒ approved shielded cable.	Level IV, 140°F (60°C) rating.
Honeywell (US only) AK3781 (one twisted pair) AK3782 (two twisted pairs).	LonWorksÒ Bus (nonplenum): 22 AWG (0.325 sq mm) twisted pair solid conductor, nonshielded or EchelonÒ approved shielded cable.	Level IV, 140°F (60°C) rating.
Honeywell AK3725 (US only), typical or equivalent.	Inputs: 18 AWG (1.0 sq mm) five wire cable bundle.	Standard thermostat wire.
Honeywell AK3752 (US only), typical or equivalent.	Outputs/Power: 14 to 18 AWG (2.0 to 1.0 sq mm).	NEC Class 2, 140°F (60°C) rating.
Honeywell AK3702 (US only), typical or equivalent.	18 AWG (1.0 sq mm) twisted pair.	Non-plenum.
Honeywell AK3712 (US only), typical or equivalent.	16 AWG (1.3 sq mm) twisted pair.	Non-plenum.
Honeywell AK3754 (US only), typical or equivalent.	14 AWG (2.0 sq mm) two conductor.	Non-plenum.

After compiling a bill of materials through completion of the previous application steps, refer to Table 6, Ordering Information.

Step 6. Configure T7300F/Q7300H
Use Excel LonSpec™ Software to configure the T7300F/Q7300H Thermostat/Subbase for specific applications. The Excel LonSpec™ User’s Guide, form 74-
2937, provides software operation instructions for the personal computer.

Step 7. Troubleshooting

1. Check for 24 Vac power.
   • Turn on the power.
   • Use a meter to check for 24 Vac power at the sub base.
   • If 24 Vac is not present, check the transformer for secure connections and proper operation.
   • If 24 Vac is present at the sub-base, turn off the power.
2. Check to the wire.
   • Inspect all wiring connections at the Q7300H terminals and verify compliance with the job site engineering drawings.
   • If any wiring changes are required, first be sure to remove power from the device before starting work.
   • Pay particular attention to: ¾ Terminal connections. Connect GND to earth ground. ¾ Device Wiring. In hookups with A1 and A2 terminals, use A1 and A2 when contacts are normally closed in Occupied mode. In hookups with A2, and A3 terminals, use A2 and A3 when contacts are normally open
     in Occupied mode. ¾ O/B Terminals. The Q7300H2003 provides O/B terminals for cool/heat changeover.
   • NOTE: All wiring must comply with applicable electrical codes and ordinances or as specified in installation wiring diagrams.

APPENDIX A: SEQUENCE OF OPERATIONS

This appendix provides the network-related control sequences of operation for the T7300F/Q7300H. For temperature control-related sequences refer to the
T7200D, E, T7300D, E,F, and Q7300 Series 2000 Programmable Commercial Thermostat and Subbase Product Data, form no. 63-4355.

Network Operations
Room Temperature Sensor (DestRmTemp) This is the room space temperature sensor. This sensor can be local (contained internally within the T7300F),
remote (external but hard-wired back to the Q7300H subbase), or network (the physical sensor is located elsewhere on the LonWorksÒ Bus, and its value is communicated to the Q7300H). The Room Temperature sensor provides the temperature input for the temperature control loop of the T7300F. If both local and remote sensors are available, the two values can be averaged and the resulting value supplied to the temperature control routine.

NOTE: A physical sensor (either local or remote) cannot be averaged with a network sensor. A valid value for the network sensor input gives the network
sensor priority over any locally-wired sensors. If a valid room temperature value is not available to the T7300F/Q7300H, the temperature control algorithm in the T7300F is disabled, causing the heating and cooling control outputs to be turned off.

Network Setpoint (DestSetPoint)
This is a center-setpoint signal sent from another LonWorksÒ Bus device. When received, it is used to calculate the actual cooling or heating occupied setpoint.
The DestSetPoint value becomes the center of the Zero Energy Band (ZEB) between the cooling and heating occupied setpoints. The size of the ZEB is found by taking the difference between programmed heating and cooling occupied setpoints (CoolOccSpt and HeatOccSpt); therefore, the actual setpoints are found as follows:

• ActualCoolSpt = DestSetPoint + (CoolOccSpt – HeatOccSpt) / 2
• ActualHeatSpt = DestSetPoint – (CoolOccSpt – HeatOccSpt) / 2

During unoccupied times, the network setpoint value is not referenced, and the programmed setpoints are used instead (CoolUnoccSpt and HeatUnoccSpt). During occupied times, if DestSetPoint is valid, it will be used to override any internal setpoints.

Network Setpoint Offset (DestSptOffset)
This is a setpoint adjustment signal sent from another LonWorksÒ devise. When received, it is used to bump the current setpoint value up or down. The amount of the bump is the value of DestSptOffset itself. The actual setpoints are found as follows:
ActualSetpoint = CurrentSetPoint + DestSptOffset
During unoccupied times, the network setpoint offset value is not referenced, and the programmed setpoints are used instead (CoolUnoccSpt and HeatUnoccSpt).

Setpoint Limits (MinCoolSetPt and MaxHeatSetPt)
User-entered setpoint limits are provided by MinCoolSetPt and MaxHeatSetPt. The occupied setpoints used in the control algorithms are limited by these parameters. The lowest actual setpoint allowed in cool mode is equal to MinCoolSetPt and the highest actual setpoint allowed in heat mode is equal to MaxHeatSetPt.

Bypass Operation (StatusOcc, DestManOcc, and DestBypass)
During unoccupied periods, the facility occupant can
request that the occupied temperature control setpoints be
observed by doing any one of the following:

• Depressing the Temporary Occupied button on the T7300F, or
• Setting the DestManOcc network point to Bypass, or
• Setting the DestBypass network point to ON.

When activated, the thermostat remains in Bypass mode until:

• Bypass duration setting has timed out (BypTime), or
• The user presses the Run button on the T7300F to switch off the Bypass mode, or
• The occupancy schedule switches the mode to occupied,
  or
• The user sets the DestManOcc network point to occupied, or unoccupied.

BypassTime
BypassTime is the time between the pressing of the override button at the wall module (or initiating bypass mode via DestManOcc) and the return to the original occupancy state. When the bypass state has been activated, the bypass timer is set to BypTime (default of 180 min.).
NOTE: A Bypass mode initiated via DestBypass does not cause the bypass timer to run. The DestBypass signal source is assumed to be tracking the duration period using its internal bypass timer.

Override Priority
A network bypass signal always has priority over local pushbutton-induced overrides. When DestManOcc is not OC_NUL, then the effective occupancy is DestManOcc, regardless of the T7300F keypad-initiated override state.

Continuous Unoccupied Mode
This mode is entered when the Continuous Unoccupied button on the T7300F is pressed. This mode can also be entered via a network command (DestManOcc set to Unoccupied). If the controller is in this mode, it reverts to the unoccupied setpoints for temperature control. The thermostat remains in this mode indefinitely until the Run button is pressed to exit the mode, or a network command is sent to clear the mode.

Occupancy Mode Arbitration (StatusOcc)
The T7300F/Q7300H has multiple sources for occupancy schedule information and, therefore, it employs an arbitration scheme to determine the current actual mode. Time-of-day (TOD) schedule status comes from either one of two sources:

• The internal schedule contained in the T7300F, or
• DestOccSchedule network input received from another LonWorksÒ device.

If DestOccSchedule is valid, it has the highest priority and determines the occupancy mode; otherwise, the status is determined by the internal schedule of the T7300F. StatusOcc has two possible states: occupied, or unoccupied.
NOTE: The T7300F/Q7300H does not support Standby mode. Manual Override of occupancy mode can occur from three sources and is governed by two selectable arbitration schemes. The two schemes are Network Wins or Last-in Wins, (as set in OvrdPriority).

The three sources of manual override status are:

• DestManOcc¾Possible states: Occupied, Unoccupied, Bypass, Standby, and Null (not active). If Standby is received, it is ignored. This input source
  has the highest priority in determining manual override status for a Network Wins arbitration scheme, or in the event, there is more than one source change at a time in the Last-in Wins arbitration scheme. Bypass initiates a self-timed bypass of the control unit and expires upon completion of the defined timed period. The controller then treats the bypass status of this input as Null until the next change in status.
• DestBypass¾Possible states: Bypass On, Bypass Off or Not Assigned (not active). This input places the controller in an untimed bypass state or turns off the bypass mode. This source is second in priority to DestManOcc under the same arbitration schemes mentioned above.
• The T7300F keypad (Temporary Occupied and Continuous Unoccupied keys).

Demand Limit Control (DestDlcShed)
When the Q7300H receives a high-electrical-demand signal, the controller applies a DlcBumpTemp amount to the current actual space temperature setpoint value. The setpoint is always adjusted in the energy-saving direction. This means that if the T7300F is in cooling mode, the DLC offset bumps the control point up, and when in heating mode, bumps the control point down. When returning from a DLC Shed event, the setpoint is gradually ramped back to its original (unpumped) value over a 30-minute period.

Start-Up
START_UP_WAIT is the first mode after the application restart or power-up. During START_UP_WAIT, no control algorithms are active.
NOTES:
¾ After a controller commission via Excel LonSpec™, the Q7300 is reset and an application restart occurs. ¾ Not all network inputs can be received during the START_UP_WAIT period because many network variables are updated at a slower rate; therefore some control decisions can be considered temporarily
inappropriate during START_UP_WAIT.

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Reference

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HONEYWELL T7300F Programmable Thermostat User Manual

HONEYWELL T7300F Programmable Thermostat User Manual