Honeywell T7300F Thermostat User Manual

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T7300F/Q7300H Series 2000 Commercial  
Thermostats and Communicating  
Subbases  
Contents  
INTRODUCTION  
...........................................................................................................................  
Description of Devices .......................................................................................  
Control Application.............................................................................................  
Control Provided.................................................................................................  
Product Names ..................................................................................................  
Products Covered...............................................................................................  
Organization of Manual ......................................................................................  
Applicable Literature ..........................................................................................  
Agency Listings..................................................................................................  
Abbreviations and Definitions.............................................................................  
3
3
3
4
4
5
5
6
6
6
CONSTRUCTION  
...........................................................................................................................  
Performance Specifications ...............................................................................  
Input/Output Summary ..................................................................................  
Communications............................................................................................  
7
8
8
9
LonMark® Functional Profile.............................................................................. 10  
Configurations.................................................................................................... 10  
General.......................................................................................................... 10  
APPLICATION STEPS  
........................................................................................................................... 11  
Overview ............................................................................................................ 11  
Step 1. Plan The System.................................................................................... 11  
Step 2. Determine Required Network Devices................................................... 12  
Step 3. Lay Out Communications and Power Wiring......................................... 12  
LonWorks Bus Layout ................................................................................ 12  
Cable Termination ......................................................................................... 14  
Singly Terminated Network Segment ....................................................... 14  
Doubly Terminated Daisy-chain Network Segment .................................. 15  
Wiring Details................................................................................................ 15  
Step 4. Prepare Wiring Diagrams ...................................................................... 15  
General Considerations................................................................................. 18  
Step 5. Order Equipment.................................................................................... 19  
Step 6. Configure T7300F/Q7300H.................................................................... 20  
Step 7. Troubleshooting..................................................................................... 20  
APPENDIX A  
........................................................................................................................... 20  
Sequence of Operations.................................................................................... 20  
USER ADDRESS  
NETWORK VARIABLES  
See form number 63-4366, Q7300 Communicating Subbase System Integration  
User Address Manual.  
LonWorks®, LonTalk®, LonMark® and Excel LonSpec™ are  
U.S. registered trademarks of Echelon® Corporation.  
®
U.S. Registered Trademark  
Copyright © 1998 Honeywell Inc. • All Rights Reserved  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
LIST OF FIGURES  
Fig. 1. Typical T7300F/Q7300H LonWorks® network diagram..........................  
Fig. 2. Typical T7300F/Q7300H application.......................................................  
Fig. 3. T7300F/Q7300H dimensions in in. (mm). ...............................................  
Fig. 4. Functional Profile Number 8060 LonMark® Thermostat Object  
3
4
8
(
Type 09) (Thermostat profile variables not used are grayed). ..................... 10  
Fig. 5. Connecting personal computer to LonWorks® Bus................................ 11  
Fig. 6. Typical topology for T7300F/Q7300H devices in  
LonWorks® network..................................................................................... 13  
Fig. 7. Wiring layout for two doubly terminated LonWorks® Bus segments...... 13  
Fig. 8. Wiring layout for one doubly terminated daisy-chain  
LonWorks® Bus segment. ............................................................................ 14  
Fig. 9. Singly terminated LonWorks Bus termination module. ........................ 14  
Fig. 10. Doubly terminated LonWorks® Bus termination modules. ................... 15  
Fig. 11. Proper wiring technique. ....................................................................... 15  
Fig. 12. Ferrite core wires from Q7300H to digital inputs and outputs............... 15  
Fig. 13. Typical hookup of T7300F/Q7300H in three-stage heat,  
two-stage cool heat pump system................................................................. 16  
Fig. 14. Typical hookup of T7300F/Q7300H in three-stage heat,  
two-stage cool heat pump system................................................................. 16  
Fig. 15. Typical hookup of T7300F/Q7300H in three-stage heat,  
three-stage cool conventional system........................................................... 17  
Fig. 16. Typical hookup of T7300F/Q7300H in two-stage heat,  
one-stage cool conventional system. ............................................................ 17  
LIST OF TABLES  
Table 1. Additional Products. .............................................................................  
Table 2. Terminal descriptions and conditions...................................................  
5
9
Table 3. Application Steps. ................................................................................ 11  
Table 4. LonWorks® Configuration Rules and Device Node Numbers.............. 12  
Table 5. Field Wiring Reference Table ............................................................... 18  
Table 6. Ordering Information. ........................................................................... 19  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
INTRODUCTION  
Control Application  
The T7300F/Q7300H Series 2000 Commercial  
Description of Devices  
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,  
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:  
1
6.  
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.  
BUILDING MANAGER  
NOTEBOOK PC  
1
4
8
12  
16  
WALL MODULE  
EXCEL 15  
W7760  
EXCEL 10  
CVAHU  
17  
23  
30 31  
37  
44  
RS-232  
SERIAL  
PORT  
®
LonWorks BUS  
SLTA  
S7760  
T7300  
Back  
Select  
MODEM  
BUILDING MANAGER  
1
4
8
12  
16  
WALL MODULE  
EXCEL 15  
W7760  
EXCEL 10  
CVAHU  
17  
23  
30 31  
37  
44  
RS-232  
SERIAL  
PORT  
MODEM  
®
SLTA  
LonWorks BUS  
S7760  
T7300  
Back  
Select  
M16083B  
Fig. 1. Typical T7300F/Q7300H LonWorks® network diagram.  
3
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
SUBBASE  
3
AS  
AS  
X
Y2  
Y1  
O
E
G
W1  
B
R
A1 A2 C5  
C4  
C3  
C2  
C1  
T
T
EB EB  
AUX.  
COMPRESSOR  
CONTACTOR 2  
HEAT  
DISCHARGE  
AIR  
SENSOR  
LonWorks®  
BUS  
FAN  
RELAY  
HEAT  
CHANGEOVER  
VALVE  
CA5  
CA4  
CA3  
CA2  
CA1  
T
T
COMPRESSOR  
CONTACTOR 1  
T7147 REMOTE COMFORT ADJUST MODULE  
GND  
®
LonWorks  
BUS  
EM. HT.  
RELAY  
ECONOMIZER  
2
4
COOL  
1
CHANGEOVER  
VALVE  
L1  
(HOT)  
L2  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION INSTRUCTIONS.  
USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED IN OCCUPIED MODE.  
CONNECT GND TO EARTH GROUND.  
TRANSFORMER  
3
4
M16056  
Fig. 2. Typical T7300F/Q7300H application.  
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.  
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:  
Part Number  
Product Description  
Q7300H2003 Communicating subbase with O and B  
terminals for three-stage heat, two-stage  
cool heat pump system.  
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.  
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 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.  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
Products Covered  
Organization of Manual  
This System Engineering manual describes how to apply  
the T7300F Thermostat and Q7300H Communicating  
Subbase and related accessories to typical applications.  
Devices include:  
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  
abbreviation and terms.  
T7300F Series 2000 Commercial Thermostat.  
Q7300H Series 2000 Communicating Subbase.  
Excel 15 W7760A Building Manager.  
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.  
Excel 10 Controllers, as follows:  
W7750A,B Constant Volume Air Handler Unit (CVAHU)  
Controller.  
W7761 Remote Input/Output (RIO) Controller.  
4. Appendix. Appendix A provides a sequence of  
operations for configuring network controllers.  
Other products:  
Q7751A,B Bus Router.  
Q7760A Serial LonTalk Adapter.  
Q7740A,B FTT Repeaters.  
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.  
2
09541B FTT Termination Module.  
See Table 1 for additional products.  
Table 1. Additional Products.  
Product Description  
Contactor, 24 Vac coil, DPDT.  
Transformers.  
Part Number  
Comments  
R8242A  
AT72D, AT88A, etc.  
074EYD  
4
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 Echelon  
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) Level IV, 140°F (60°C) rating.  
twisted pair solid conductor, nonshielded or Echelon  
approved shielded cable.  
Honeywell AK3725 (US only),  
typical or equivalent.  
Inputs: 18 AWG (1.0 sq mm) five wire cable bundle.  
Outputs/Power: 14 to 18 AWG (2.0 to 1.0 sq mm).  
18 AWG (1.0 sq mm) twisted pair.  
Standard thermostat wire.  
NEC Class 2, 140°F (60°C) rating.  
Non-plenum.  
Honeywell AK3752 (US only),  
typical or equivalent.  
Honeywell AK3702 (US only),  
typical or equivalent.  
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.  
5
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
Applicable Literature  
ABBREVIATIONS AND DEFINITIONS  
The following list of documents contains general  
information related to the T7300F/Q7300H Series 2000  
Commercial Thermostats and Communicating Subbases.  
Application—A specific Building Control function.  
Binding—The process of logically connecting network  
variables in one node to network variable(s) in other  
node(s). Binding is performed by a network management  
node that writes the binding information into the EEPROM  
memory of all the neuron's involved. The binding  
Form No.  
Title  
6
2-0125  
T7300F Series 2000 Commercial  
Microelectronic Conventional or Heat  
Pump Thermostat Installation Instructions  
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.  
6
2-0155  
Q7300H Series 2000 Commercial  
Thermostat Installation Instructions  
7
7
4-2976  
4-2977  
Excel LonSpec™ Specification Data  
Command Display—A device that can be used to monitor  
and change parameters.  
Excel LonSpec™ Software Release  
Bulletin  
7
7
4-2937  
4-2982  
Excel LonSpec™ User’s Guide  
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.  
Light Commercial Building Solutions  
System Specification Data  
(
In Excel 10 class devices, the control loop occupies the  
7
7
4-2865  
4-2967  
E-Bus Wiring Guidelines User’s Guide  
entire node.)  
Excel 15 W7760A Building Manager  
Specification Data  
CVAHU—Excel 10 Constant Volume Air Handler Unit  
Controller.  
9
7
7
9
7
7
9
7
7
9
9
5-7565  
4-2969  
4-2956  
5-7521  
4-2958  
4-2698  
5-7539  
4-2699  
4-2697  
5-7538  
5-7554  
Excel 15 W7760A Building Manager  
Installation Instructions  
Excel 10s—A family of application - specific HVAC  
controllers such as the Excel 10 CVAHU and Excel 10  
RIO.  
Excel 15 W7760A Building Manager  
System Engineering  
Excel 10 W7750A,B CVAHU Controller  
Specification Data  
HVAC—Heating, Ventilating and Air Conditioning.  
I/O—Input/Output.  
Excel 10 W7750A,B CVAHU Controller  
Installation Instructions  
LonWorks® Network—A data network based on neurons  
communicating with each other using the LonTalk®  
protocol.  
Excel 10 W7750A,B CVAHU Controller  
System Engineering  
Excel 10 W7761A RIO Controller  
Specification Data  
Mandatory Mechanisms/Objects/Network Variables—  
Mandatory mechanisms and network variables that are  
implemented in all the Excel 10 devices.  
Excel 10 W7761A RIO Controller  
Installation Instructions  
Excel 10 W7761A RIO Controller System  
Engineering  
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.  
T7770A, B, C, D, E, F, G Wall Module  
Specification Data  
T7770A, B, C, D, E, F, G Wall Module  
Installation Instructions  
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.  
209541B Termination Module Installation  
Instructions  
Agency Listings  
European Community Mark (CE): Conforms to  
requirements of European Consortium Standards.  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
Network Variables—A class of variables defined in  
RIO—Excel 10 Remote Input/Output device.  
RTC—Real Time Clock.  
Neuron C that allows communication over the LonWorks®  
network to other nodes on the network. An output network  
variable in one node can be bound to corresponding input  
network variable(s) in other 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 other node(s). When an input  
network variable is updated, an 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).  
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.  
Node—A device implementing layers one through six of  
the LonTalk® protocol including a Neuron® Chip,  
transceiver, memory, and support hardware.  
SNVT—Standard Network Variable Type.  
SCPT—Standard Configuration Parameter Type.  
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.  
CONSTRUCTION  
The T7300F Thermostat has a keypad for setting system  
parameters, a corresponding LCD display and a flip-down  
keypad cover. The T7300F Thermostat mounts on the  
Q7300H Subbase.  
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.  
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  
subbase mounts horizontally on the wall or on a  
Recovery Mode or Recovery Period—The time in  
unoccupied periods when the temperature control is  
adjusting the control setpoint so that the space  
temperature reaches the occupied setpoint when the  
schedule change occurs.  
2
in. x 4 in. junction box.  
Fig. 3 shows T7300F/Q7300H dimensions.  
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6-11/16 (170)  
1/16 (2)  
3-3/16 (77)  
1-3/8 (35)  
1
(
-7/8  
47)  
4-1/8  
(105)  
1-11/16  
(43)  
7-5/16 (186)  
7/8  
(22)  
4
-5/8  
Set Program  
Unoccupied  
Start Time  
Set Temperature  
Run  
Program  
Occupied  
Start Time  
Change  
Time/Temp  
(117)  
Occupied  
Temp  
Unoccupied  
Temp  
Day  
Temporary  
Occupied  
Set Current  
Day/Time  
Clear  
Start Time  
Heat/Cool  
Settings  
Copy  
Continous  
Unoccupied  
System  
Fan  
M16086A  
Fig. 3. T7300F/Q7300H dimensions in in. (mm).  
Differential:  
Performance Specifications  
2
°F (1°C).  
Electrical Ratings:  
Humidity Ratings:  
% to 90% RH, noncondensing.  
Power: 20 to 30 Vac, 50/60 Hz.  
System Current: 6 VA maximum at 30 Vac, 50 or 60 Hz.  
5
Input/Output Summary:  
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).  
Table 2 summarizes the T7300F/Q7300H  
Thermostat/Subbase inputs and outputs.  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
Table 2. Terminal descriptions and conditions.  
Standard Terminal  
Designations  
Typical Connection  
Function  
Terminal Type  
A1, A3  
Damper control relay. See T7300F Installation Instructions, form  
Output  
Dry contract  
6
9-1025-3, installer setup 18, for control parameters.  
A2  
AS,AS  
B
Dry auxiliary contact. (A2 is common to A1, A3.)  
C7150B Discharge Air Sensor connection.  
Heating changeover valve.  
Input  
Input  
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  
Output  
Low power  
E
Emergency heat relay.  
24V powered  
contact  
EB, EB  
FC  
LonWorks® Bus connection to LonWorks® network.  
Fan control transformer.  
Input/output  
Input  
Communications  
G
Fan relay.  
Output  
GH  
GL  
High speed fan output. Activated during call for cooling.  
Output  
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.  
24V cooling transformer.  
24V heating transformer.  
Input  
Input  
RC  
RH  
RM  
Input  
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  
W1  
W2  
W3  
X
Remote sensor input for T7047 or T7147.  
Stage 1 heating relay or auxiliary heat relay.  
Stage 2 heating relay  
Input  
Output  
Output  
Stage 3 heating relay  
Output  
Heating transformer common.  
Cool call.  
Input  
Y
24V output on Y  
Output  
Y1  
Y2  
Stage 1 compressor contactor.  
Stage 2 cooling compressor (conventional). Stage 2  
compressor contactor (heat pump).  
Output  
Y3  
Stage 3 cooling compressor.  
Output  
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  
LonWorks® Bus.  
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  
9
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
Approved cable types for LonWorks® Bus  
NOTE: For additional information on the LonMark®  
Functional Profile, see the LonMark® Application  
Layer Interoperability Guidelines and the  
communications wiring are Level IV, 22 AWG (0.34 sq  
mm) plenum or non-plenum rated unshielded, twisted pair,  
solid conductor wire. For nonplenum areas, use US part  
AK3781 (one pair) or US part AK3782 (two pair). In  
plenum areas, use US part AK3791 (one pair) or US part  
AK3792 (two pair). Other Echelon approved cable 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: Thermostat. Both  
documents are available from LonMark® at  
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 LonWorks network.  
LonMark® Functional Profile  
The Q7300H supports the LonMark® Functional Profile  
Number 8060,Thermostat Object (Type 09). See Fig. 4.  
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  
Hardware  
Output  
Thermostat Object  
Type Number 09.  
Current setpoint  
nviSetpoint  
nvoHeatOutput  
Occupied/Unoccupied schedule commands  
Current occupancy status  
Relay status (heat/cool stages and fan)  
Alarm status  
nv1  
nv2  
SNVT_temp_p  
SNVT_ lev_percent  
nvoCoolOutput  
SNVT_ lev_percent  
Mandatory nv3  
Network  
Variables  
Alarm log  
nvoSpaceTemp  
SNVT_ temp_p  
nv4  
nv5  
A network configuration tool is used to configure Q7300Hs  
and other nodes with which the Q7300H interacts.  
nvoUnitStatus  
SNVT_hvac_status  
nviSpaceTemp  
SNVT_ temp_p  
nvoTerminalLoad  
The following is a brief description of the configurable  
features that can be commanded over the network:  
nv6  
nv7  
nv8  
nv9  
nv11  
nv12  
nv13  
nv14  
SNVT_ lev_percent  
nviOccCmd  
SNVT_occupancy  
nvoEffectSetpt  
SNVT_ temp_p  
Day-of-Week/Time-of-Day:  
When a T7300F Thermostat is designated as the  
network time master, the current time of day and day of  
week is synchronized across the network every minute.  
Whenever the time of day or day of 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.  
Optional  
Network  
Variables  
nviApplicMode  
SNVT_hvac_mode  
nvoTerminalfan  
SNVT_switch  
nviSetptOffset  
SNVT_ temp_p  
nvoEnergyHoldOff  
SNVT_switch  
nviEnergyHoldOff  
SNVT_switch  
nv10  
Configuration Properties  
nc49 - nciSndHrtBt  
SNVT_time_sec  
SNVT_time_sec  
SNVT_temp_p  
SNVT_str_asc  
SNVT_temp_setpt  
SNVT_temp_p  
SNVT_temp_p  
SNVT_temp_p  
SNVT_temp_p  
(mandatory)  
System Switch Settings:  
nc48 - nciRcvHrtBt  
nc64 - nciMin Delta  
nc17 - neiLocation  
nc60 - nciSetPnts  
nc79 - nciUpSPHeat  
nc80 - nciLrSPHeat  
nc76 - nciUpSPCool  
nc77 - nciLrSPCool  
(optional)  
(optional)  
(optional)  
(mandatory)  
(optional)  
(optional)  
(optional)  
(optional)  
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:  
Manufacturer  
Defined  
If a valid space temperature value is received at the  
Q7300H DestRmTemp network variable input, that  
value will be used in the T7300F as the primary  
controlled variable. In this case, the internal space  
sensor of the T7300F is ignored.  
Section  
Hardware  
Input  
M16087A  
Current Setpoint:  
If a valid setpoint value is received at Q7300H  
DestSetPoint, that value will be used by the 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.  
Fig. 4. Functional Profile Number 8060 LonMark®  
Thermostat Object (Type 09).  
(
Thermostat profile variables not used are grayed).  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
Schedule:  
Table 3. Application Steps.  
The occupancy schedule used by a T7300F may reside  
locally in that device or remotely in another schedule  
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 schedule 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 LCD displays LOC if attempted. When  
a T7300F Thermostat is designated as a schedule  
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.  
Step  
Description  
Plan the system.  
1
2
3
4
5
6
7
Determine required network devices.  
Lay out communications and power wiring.  
Prepare wiring diagrams.  
Order equipment.  
Configure T7300F/Q7300H.  
Troubleshooting.  
Step 1. Plan the System  
Plan 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.  
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  
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  
in future projects.  
LonWorksnetwork).  
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.  
NOTEBOOK PC  
Setpoint Changes:  
SHIELDED  
INTERFACE  
CABLE  
RS-232  
Selecting a temporary setpoint modifies that setpoint for  
the present schedule period. Pressing Run Program  
terminates temporary setpoints. Temperature setpoint  
range is 40°F to 90°F (4°C to 32°C).  
T7300  
SERIAL  
PORT  
Q7760  
SLTA  
Temporary Override:  
Modifies the schedule to operate the thermostat in  
occupied mode for a designated number of hours.  
Temporary occupied time can be selected for 1, 3, 8 or  
CABLE  
PART  
NO. 205979  
®
LonWorks  
BUS PORT  
1
2 hours. If a change from occupied to unoccupied is  
M10102B  
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 occupied  
setpoint until the override time expires.  
Fig. 5. Connecting personal computer to LonWorks  
Bus.  
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.  
APPLICATION STEPS  
6
through 10 in Application Step 4. Prepare Wiring  
Diagrams, for wiring details.  
Overview  
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.  
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.  
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In addition, a 209541B Termination Module may be  
Step 2. Determine Required Network  
required. Refer to the E-Bus Wiring Guidelines, form 74-  
Devices  
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.  
A maximum of 60 nodes can communicate on a single  
LonWorks Bus segment. Each LonWorks 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  
LonWorks Bus segments. A router or repeater allows up  
to 120 controller nodes per network, divided between two  
LonWorks 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 are able to talk to each  
other through the router.  
Step 3. Lay Out Communications and  
Power Wiring  
LonWorks® Bus Layout  
The communications LonWorks Bus, is a 78-kilobit  
network that uses transformer isolation and differential  
Manchester encoding.  
Multiple operator terminals can be connected to the  
LonWorks Bus at the same time. Table 4 summarizes  
the LonWorks Bus segment configuration rules.  
The Free Topology Transceiver (FTT) LonWorks  
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  
LonWorks network topology 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 LonWorks 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.  
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  
LonWorks Bus segments.  
Table 4. LonWorks Bus Configuration Rules and Device Node Numbers.  
One LonWorks Bus Segment  
Maximum number of Excel 10s  
Maximum Number of Controller Nodes 60  
60 nodes (minus number of Excel 15s)  
4 nodes  
Maximum number of Excel 15s  
Total 60 nodes maximum  
Two LonWorks Bus Segments; with Excel 15  
Maximum Number of Controller Nodes 112, plus two  
nodes for router access.  
Controllers, more than 60 devices  
One Q7751A,B Router  
2 nodes  
Maximum number of Excel 15s  
8 nodes  
Maximum number of Excel 10 RIO devices  
Maximum number of Excel 10s (20 per each Excel 15)  
24 nodes  
112 nodes (minus number of RIOs)  
Total 122 nodes maximum  
Two LonWorks Bus Segments; without Excel 15  
Maximum Number of Controller Nodes 120, plus two  
nodes for router access.  
Controllers, more than 60 devices  
One Q7751A,B Router  
2 nodes  
Maximum number of Excel 10s (60 per segment)  
120 nodes  
Total 122 nodes maximum  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
NOTEBOOK PC  
T7300  
T7300  
T7300  
T7300  
RS-232  
®
LonWorks BUS  
SLTA  
T7300  
MODEM  
MODEM  
RS-232  
®
LonWorks BUS  
SLTA  
T7300  
T7300  
T7300  
T7300  
MODEM  
RS-232  
®
LonWorks BUS  
SLTA  
M16063A  
Fig. 6. Typical topology for T7300F/Q7300H devices in LonWorks network.  
209541B  
TERMINATION  
MODULE  
®
LonWorks BUS SEGMENT NUMBER 1  
T7300  
EXCEL 10  
EXCEL 10  
CVAHU  
EXCEL 10  
CVAHU  
T7770  
CVAHU  
209541B  
209541B  
TERMINATION  
MODULE  
TERMINATION  
MODULE  
®
LonWorks  
BUS ACCESS  
®
LonWorks BUS  
SEGMENT NUMBER 2  
T7300  
T7300  
BUILDING MANAGER  
1
4
8
12  
16  
Q7751A  
FTT  
EXCEL 15  
W7760  
E-BUS  
ROUTER  
209541B  
TERMINATION  
MODULE  
17  
23  
30 31  
37  
44  
®
LonWorks BUS SEGMENT NUMBER 2  
EXCEL 10  
CVAHU  
EXCEL 10  
CVAHU  
EXCEL 10  
CVAHU  
M16084C  
Fig. 7. Wiring layout for two doubly terminated LonWorks Bus segments.  
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®
LonWorks BUS  
EXCEL 10  
CVAHU  
EXCEL 10  
RI0  
EXCEL 10  
RI0  
T7770  
EXCEL 10  
RI0  
T7300  
2
09541B TERMINATION  
MODULES (AT ENDS OF  
LonWorks BUS  
®
DAISY-CHAIN)  
T7300  
T7300  
EXCEL 10  
CVAHU  
T7770  
WITH NO  
LonWorks  
T7300  
®
BUS ACCESS  
BUILDING MANAGER  
1
4
8
12  
16  
EXCEL 15  
W7760  
EXCEL 10  
RI0  
T7300  
T7300  
T7300  
T7300  
17  
23  
30 31  
37  
44  
®
LonWorks  
BUS  
T7770  
WITH NO  
LonWorks  
®
BUS ACCESS  
EXCEL 10  
RI0  
EXCEL 10  
CVAHU  
EXCEL 10  
RI0  
EXCEL 10  
RI0  
T7770  
®
LonWorks BUS  
T7770  
T7770  
JACK FOR  
OPERATOR  
TERMINAL  
T7770  
I/O CONNECTIONS  
M16085B  
Fig. 8. Wiring layout for one doubly terminated daisy-chain LonWorks segment.  
Cable Termination  
The FTT network segment requires termination for proper  
data transmission performance. Use a 209541B  
C1 C2 C3 C4 C5  
Termination Module to connect two of the three termination  
module wires to the LonWorks Bus terminals.  
EB EB  
X
T
T AS AS  
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.  
YELLOW  
BROWN  
PART NO. 209541B  
TERMINATION MODULE  
M16202  
ORANGE  
Fig. 9. Singly terminated LonWorks Bus termination  
module.  
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2
3
4
. 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.  
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  
NOTE: After wiring, check that all connections are tight  
and secure. See Fig. 11. Loose or intermittent  
wire connections can cause inconsistent system  
operation.  
Termination Module Installation Instructions, form 95-7554.  
C1 C2 C3 C4 C5  
FOR STRAIGHT  
INSERTION STRIP  
FOR WRAPAROUND  
INSERTION STRIP  
7/16 IN. (11 MM).  
5/16 IN. (8 MM).  
EB EB  
X
T
T AS AS  
M4826  
Fig. 11. Proper wiring technique.  
BROWN  
ORANGE  
Wiring Details  
PART NO. 209541B  
TERMINATION MODULE  
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)  
separation between split ferrite cores (Fair-Rite  
YELLOW  
0
443164151, 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.  
C1 C2 C3 C4 C5  
EB EB  
X
T
T AS AS  
1.  
WIRES TO Q7300H  
COMMUNICATING SUBBASE  
BROWN  
ORANGE  
PART NO. 209541B  
TERMINATION MODULE  
WIRES TO ALL  
INPUTS AND  
OUTPUTS  
2.  
YELLOW  
WIRES TO ALL  
INPUTS AND  
OUTPUTS  
M16122  
Fig. 10. Doubly terminated LonWorks Bus  
termination modules.  
WIRES TO Q7300H  
COMMUNICATING SUBBASE  
M10886A  
CAUTION  
Power supply can cause electrical shock.  
Disconnect power supply before beginning  
installation.  
Electrical Shock Hazard.  
Fig. 12. Ferrite core wires from Q7300H to LonWorks®  
inputs and outputs.  
1
. Loosen the terminal screws on the subbase and  
connect the system wires. See Fig. 11.  
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.  
IMPORTANT  
Use 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.  
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SUBBASE  
2
AS  
AS  
X
Y1  
G
Y2  
E
W3 W2 W1 R  
A1 A2 A3 C5 C4  
C3  
C2  
C1  
T
T
EB EB  
EM. HT.  
RELAY  
HEAT  
RELAY 2  
COMPRESSOR  
CONTACTOR 1  
ECONOMIZER  
4
DISCHARGE  
AIR  
SENSOR  
®
LonWorks BUS  
CA5 CA4 CA3 CA2 CA1  
T
T
FAN  
RELAY  
T7147 REMOTE COMFORT ADJUST MODULE  
GND  
®
HEAT  
RELAY 3  
LonWorks BUS  
3
1
COMPRESSOR  
CONTACTOR 2  
HEAT  
RELAY 1  
L1  
(
HOT)  
L2  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
TRANSFORMER  
USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED IN OCCUPIED MODE.  
USE A2 AND A3 WHEN CONTACTS ARE NORMALLY OPEN IN OCCUPIED MODE.  
3
4
CONNECT GND TO EARTH GROUND.  
M16057  
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).  
SUBBASE  
3
AS  
AS  
X
Y2  
Y1  
O
E
G
W1  
B
R
A1 A2 C5  
C4  
C3  
C2  
C1  
T
T
EB EB  
AUX.  
COMPRESSOR  
CONTACTOR 2  
HEAT  
DISCHARGE  
AIR  
SENSOR  
LonWorks®  
BUS  
FAN  
RELAY  
HEAT  
CHANGEOVER  
VALVE  
CA5  
CA4  
CA3  
CA2  
CA1  
T
T
COMPRESSOR  
CONTACTOR 1  
T7147 REMOTE COMFORT ADJUST MODULE  
GND  
®
LonWorks  
BUS  
EM. HT.  
RELAY  
ECONOMIZER  
2
4
COOL  
1
CHANGEOVER  
VALVE  
L1  
(HOT)  
L2  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION INSTRUCTIONS.  
USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED IN OCCUPIED MODE.  
CONNECT GND TO EARTH GROUND.  
TRANSFORMER  
3
4
M16056  
Fig. 14. Typical hookup of T7300F/Q7300H in three-stage heat, two-stage cool heat pump system (with O/B terminals).  
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SUBBASE  
3
AS  
AS  
RC  
Y1  
G
Y2  
Y3  
X
W3  
W2 W1 RH  
A1 A2 A3 C5  
C4  
C3  
C2  
C1  
T
T
EB EB  
2
COMPRESSOR  
CONTACTOR 1  
HEAT  
RELAY 2  
COMPRESSOR  
CONTACTOR 2  
ECONOMIZER  
DISCHARGE  
AIR  
SENSOR  
®
LonWorks  
BUS  
5
CA5  
CA4  
CA3  
CA2  
CA1  
T
T
FAN  
RELAY  
T7147 REMOTE COMFORT ADJUST MODULE  
®
LonWorks  
BUS  
COMPRESSOR  
CONTACTOR 3  
GND  
1
4
HEAT  
RELAY 3  
HEAT  
RELAY 1  
L1  
(HOT)  
L1  
HOT)  
(
L2  
L2  
1
HEATING  
TRANSFORMER  
COOLING  
TRANSFORMER  
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
4
5
CONNECT GND TO EARTH GROUND.  
USE ECONOMIZER INSTRUCTIONS FOR INSTALLATION DIRECTIONS.  
JUMPER RC TERMINAL TO RH TERMINAL WHEN INSTALLED ON A  
SYSTEM WITH ONE TRANSFORMER.  
M16058  
USE A1 AND A2 WHEN CONTACTS ARE NORMALLY CLOSED  
IN OCCUPIED MODE. USE A2 AND A3 WHEN CONTACTS  
ARE NORMALLY OPEN IN OCCUPIED MODE.  
Fig. 15. Typical hookup of T7300F/Q7300H in three-stage heat, three-stage cool conventional system.  
SUBBASE  
AS  
AS FC  
GL  
GH  
X
R
Y
RM BM P1 P2 A1 A2  
C5 C4 C3  
C2 C1  
T
T
EB EB  
HIGH  
SPEED  
FAN  
DAMPER  
CONTROL  
RELAY  
ML7984  
VALVE  
ACTUATOR  
DISCHARGE  
AIR  
®
LonWorks BUS  
RELAY  
3
SENSOR  
LOW  
SPEED  
FAN  
CA2 CA1  
T7147 REMOTE COMFORT  
ADJUST MODULE  
T
T
CA5 CA4 CA3  
®
LonWorks BUS  
COOLING  
RELAY  
PUMP  
INTERLOCK  
RELAY  
GND  
RELAY  
1
2
L1  
L1  
HOT)  
(
HOT)  
(
1
L2  
L2  
FAN TRANSFORMER  
TRANSFORMER  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.  
CONNECT GND TO EARTH GROUND.  
2
3
M16059  
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.  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
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.  
Recommended  
Wire  
Wire Size  
Specification  
Distance  
Function  
(Minimum)  
Construction  
or Requirement  
Vendor Wire Type  
(Maximum)  
Thermostat  
wire.  
Inputs: 18 AWG  
(1.0 sq mm) five  
wire cable bundle.  
Standard thermostat  
wire.  
Honeywell AK3725  
(US only), typical or  
equivalent.  
Thermostat  
wire.  
Outputs/Power:  
14 to 18 AWG  
NEC Class 2, 140°F  
(60°C) rating.  
Level IV, 140°F  
(60°C) rating.  
Honeywell AK3752  
(US only), typical or  
equivalent.  
(
1
2.0 to  
.0 sq mm).  
LonWorks  
Bus (Non-  
Plenum).  
22 AWG  
(0.34 sq mm)  
Twisted pair solid  
conductor,  
nonshielded or  
Echelon® approved  
cable.  
Level IV, 140°F  
(60°C) rating.  
Honeywell AK3781  
(one twisted pair),  
AK3782 (two twisted  
pair).  
Refer to E-bus  
Wiring guidelines  
Users Guide  
74-2865-1 for  
maximum length.  
Power  
Wiring.  
14 AWG  
(2.0 sq mm)  
Any pair nonshielded NEC Class II,  
Honeywell AK3754  
(14 AWG) twisted  
pair), AK3909  
Limited by line-loss  
effects on power  
consumption.  
(use heavier wire for  
longer runs).  
140°F (60°C)  
rating.  
(
14 AWG) single  
conductor or  
equivalent.  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
Step 5. Order Equipment  
After compiling a bill of materials through completion of the previous application steps, refer to Table 6, Ordering Information.  
Table 6. Ordering Information.  
Part Number  
Q7300H2003  
Product Description  
Comments  
Communicating subbase with O and B  
terminals for three-stage heat, two-stage cool sensing; A1, A2, A3 terminals for optional  
Includes AS terminals for optional discharge air  
heat pump system.  
economizer.  
Q7300H2011  
Q7300H2029  
Q7300H2037  
T7300F2002  
Communicating subbase without O and B  
terminals for three-stage heat, two-stage cool sensing; A1, A2, A3 terminals for optional  
heat pump system.  
Includes AS terminals for optional discharge air  
economizer.  
Communicating subbase for three-stage  
heat, three-stage cool conventional system. sensing; A1, A2, A3 terminals for optional  
economizer.  
Includes AS terminals for optional discharge air  
Communicating subbase for two-stage heat, Includes AS terminals for optional discharge air  
one-stage cool conventional system with  
valve two-position heat output.  
sensing; A1, A2, A3 terminals for optional  
economizer.  
Series 2000 Commercial Electronic  
Thermostat without system and fan  
switching.  
Use with Q7300H Communicating Subbase for  
network communications.  
T7300F2010  
W7750A,B  
W7761A  
Series 2000 Commercial Electronic  
Thermostat with system and fan switching.  
Use with Q7300H Communicating Subbase for  
network communications.  
Excel 10 Constant Volume Air Handler Unit. Single-speed fan provides continuous supply air  
to designated area.  
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 Obtain locally from any computer hardware  
DB-9 or female DB-25.  
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 Echelon 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 Echelon approved shielded  
cable.  
Level IV, 140°F (60°C) rating.  
Honeywell AK3725 (US only), Inputs: 18 AWG (1.0 sq mm) five wire cable Standard thermostat wire.  
typical or equivalent. bundle.  
Honeywell AK3752 (US only), Outputs/Power: 14 to 18 AWG  
typical or equivalent. (2.0 to 1.0 sq mm).  
NEC Class 2, 140°F (60°C) rating.  
Honeywell AK3702 (US only), 18 AWG (1.0 sq mm) twisted pair.  
typical or equivalent.  
Non-plenum.  
Honeywell AK3712 (US only), 16 AWG (1.3 sq mm) twisted pair.  
typical or equivalent.  
Non-plenum.  
Honeywell AK3754 (US only), 14 AWG (2.0 sq mm) two conductor.  
typical or equivalent.  
Non-plenum.  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
communicated to the Q7300H). The Room Temperature  
Step 6. Configure T7300F/Q7300H  
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  
Use Excel LonSpec™ Software to configure the  
T7300F/Q7300H Thermostat/Subbase for specific  
applications. The Excel LonSpec™ User’s Guide, form 74-  
routine.  
2
937, provides software operation instructions for the  
personal computer.  
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.  
Step 7. Troubleshooting  
1
2
. Check for 24 Vac power.  
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.  
a. Turn on power.  
b. Use a meter to check for 24 Vac power at the  
subbase.  
c. If 24 Vac is not present, check the transformer  
for secure connections and proper operation.  
d. If 24 Vac is present at the subbase, turn off the  
power.  
Network Setpoint (DestSetPoint)  
This is a center-setpoint signal sent from another  
LonWorks 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 the programmed heating and  
cooling occupied setpoints (CoolOccSpt and HeatOccSpt);  
therefore, the actual setpoints are found as follows:  
ActualCoolSpt = DestSetPoint + (CoolOccSpt -  
HeatOccSpt) / 2  
. Check wiring.  
a. Inspect all wiring connections at the Q7300H  
terminals and verify compliance with the job  
site engineering drawings.  
b. If any wiring changes are required, first be  
sure to remove power from the device before  
starting work.  
c. Pay particular attention to:  
Terminal connections. Connect GND to  
earth ground.  
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, A3 terminals, use A2  
and A3 when contacts are normally open  
in Occupied mode.  
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.  
O/B Terminals. The Q7300H2003  
provides O/B terminals for cool/heat  
changeover.  
Network Setpoint Offset (DestSptOffset)  
NOTE: All wiring must comply with applicable electrical  
codes and ordinances or as specified in  
installation wiring diagrams.  
This is a setpoint adjustment signal sent from another  
LonWorks device. 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:  
APPENDIX A: SEQUENCE OF  
OPERATIONS  
ActualSetpoint = CurrentSetPoint + DestSptOffset  
During unoccupied times, the network setpoint offset value  
is not referenced, and the programmed setpoints are used  
instead (CoolUnoccSpt and HeatUnoccSpt).  
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.  
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.  
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 (physical sensor is located  
elsewhere on the LonWorks Bus, and its value is  
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T7300F/Q7300H SERIES 2000 COMMERCIAL THERMOSTATS AND COMMUNICATING SUBBASES  
If DestOccSchedule is valid, it has 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.  
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:  
NOTE: The T7300F/Q7300H does not support Standby  
mode.  
Depressing the Temporary Occupied button on the  
T7300F, or  
Setting the DestManOcc network point to Bypass, or  
Setting the DestBypass network point to ON.  
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).  
When activated, the thermostat remains in Bypass mode  
until:  
Bypass duration setting has timed out (BypTime), or  
User presses the Run button on the T7300F to switch  
off the Bypass mode, or  
The three sources of manual override status are:  
DestManOcc Possible 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.  
DestBypass Possible 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.  
Occupancy schedule switches the mode to occupied,  
or  
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  
1
80 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  
The T7300F keypad (Temporary Occupied and  
Continuous Unoccupied keys).  
duration peiod using its internal bypass timer.  
Demand Limit Control (DestDlcShed)  
Override Priority  
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.  
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  
When returning from a DLC Shed event, the setpoint is  
gradually ramped back to its original (unbumped) value  
over a 30-minute period.  
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.  
Start-Up  
START_UP_WAIT is the first mode after application restart  
or power-up. During START_UP_WAIT, no control  
algorithms are active.  
Occupancy Mode Arbitration (StatusOcc)  
NOTES:  
After a controller commission via Excel LonSpec™,  
the Q7300 is reset and an application restart occurs.  
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.  
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:  
Internal schedule contained in the T7300F, or  
DestOccSchedule network input received from  
another LonWorks device.  
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Home and Building Control Honeywell Asia Pacific Inc.  
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