Taco Comfort Solutions VT7300 Series Use and care manual

SUPERSEDES: New EFFECTIVE: November 1, 2008
LonWorks Integration Manual
PIR Ready VT7300 Series
24 Vac Low Voltage Fan Coil Thermostats
For Commercial and Lodging HVAC Applications
Integration Manual
VT7300 Series Thermostats
102-221

2
Product Overview
The VT7300 PI thermostat family is specifically designed for fan coil control. The
product features a backlit LCD display with dedicated function menu buttons for simple
operation. Accurate temperature control is achieved due to the product’s PI
proportional control algorithm, which virtually eliminates temperature offset associated
with traditional, differential-based thermostats.
Models are available for On/Off, 3 point floating and analog 0 to 10 Vdc control.
All models contain can control three, two or single fan speed. 3 additional inputs are
also provided for monitoring and / or various advanced functions.
All models feature configurable System and Fan button functions to meet all possible
applications. They all contain an SPST auxiliary switch that can be used to control
lighting or auxiliary reheat.
The thermostats are also compatible with the new TACO PIR cover accessories. Thermostats equipped with a PIR cover
provide advanced active occupancy logic, which will automatically switch occupancy levels from Occupied to Stand-By
and Unoccupied as required by local activity being present or not. This advanced occupancy functionality provides
advantageous energy savings during occupied hours without sacrificing occupant comfort. All thermostats can be ordered
with or without a factory installed PIR cover (see notes below ).
The additional following documents are available at: www.taco-hvac.com
•PIR application information and examples, are available on document: PIR Application Guide 102-354
•PIR cover installation information is available on document: PIR Cover Install Guide 102-355
•Detailed information on the thermostat (VT73xxX5x21x), is available on document:102-220
Contents
•Thermostat Objects
•SNVTs and SCPTs Table Per Model
•Input Network Variables (nvi’s) Description
•Output Network Variables (nvo’s) Description
•Configuration Properties (nci’s) Description
•Integration - Global Commands
•Integration - Graphic User Interface (GUI) Objects
•Integration - Configuration Objects
•Wiring Guide
Overview
Network Configuration
Maximum Number Of Devices
Maximum Cable Length
EI-485 Repeaters
Terminators
•Network Adapter
•Software Files
•RoHS and Non-RoSH APB and NXE Files
•Device Identification
•Tips And Things You Need To Know
•Troubleshooting Section
•Document Control

3
Thermostat Objects
VT7300 Space Comfort Controller
Object Type #8500
nvoSpaceTemp
SNVT_temp_p
Configuration Properties
Send Heartbeat (mandatory)
Temperature Setpoints (mandatory)
Minimum Send Time (optional)
Receive Heartbeat (optional)
nviSpaceTemp
SNVT_temp_p
Mandatory
Network
Variables
Optional
Network
Variables
Manufacturer
Network
Variables
nvoUnitStatus
SNVT_hvac_status
nvoDischAirTemp
SNVT_temp_p
nvoEffectOccup
SNVT_occupancy
nvoSpaceRH
SNVT_lev_percent
Manufacturer Configuration Properties
Please see the manual for details.
Plug-In for configuration provided.
nviOutdoorTemp
SNVT_temp_p
nvoSCCstatus
SNVT_state_64
nviSetpoint
SNVT_temp_p
nviSpaceRH
SNVT_lev_percent
nviFanSpeedCmd
SNVT_switch
nviAuxHeatEnable
SNVT_switch
nviOccManCmd
SNVT_occupancy
nviApplicMode
SNVT_hvac_mode
nviHeatCool
SNVT_hvac_mode
nviRemLockout
SNVT_count
nviDhumidLCK
SNVT_switch
nviAuxOut
SNVT_switch
nvoTerminalLoad
SNVT_lev_percent

4
SNVTs1and SCPTs2Table Per Model
Model Number
VT7300A5x21E VT7300C5x21E VT7350C5x21E VT7305A5x21E VT7305C5x21E VT7355C5x21E
VT7300F5x21E VT7350F5x21E VT7305F5x21E VT7355F5x21E
VT7300M5x21E
No
Sub
Point Name
N/A: Not applicable on this model
0nviSpaceTemp XXXXXXXXXXX
1nviOutdoorTemp XXXXXXXXXXX
2nviSetpoint XXXXXXXXXXX
3nviSpaceRH N/A N/A X N/A N/A X N/A X N/A X N/A
4nviFanSpeedCmd XXXXXXXXXXX
5nviAuxHeatEnable XXXXXXXXXXX
6nviOccManCmd XXXXXXXXXXX
7nviApplicMode XXXXXXXXXXX
8nviHeatCool XXXXXXXXXXX
9nviRemLockout XXXXXXXXXXX
10 nviDhumiLCK N/A N/A X N/A N/A X N/A X N/A X N/A
11 nviAuxOut XXXXXXXXXXX
12 nvoSpaceTemp XXXXXXXXXXX
13 nvoDischAirTemp XXXXXXXXXXX
14 nvoSpaceRH N/A N/A X N/A N/A X N/A X N/A X N/A
15 nvoEffectOccup XXXXXXXXXXX
16 nvoUnitStatus XXXXXXXXXXX
1 mode xxxxxxxxxxx
2 heat_output_primary x x xxxxxxxxx
4 cool_output x x xxxxxxxxx
6 fan_output x x xxxxxxxxx
7 in_alarm x x xxxxxxxxx
17 nvoSccStatus XXXXXXXXXXX
1 StateTerminal BO2 x x xxxxN/AN/AN/AN/AN/A
2 StateTerminal BO1 N/A x x N/A x x N/A N/A N/A N/A N/A
3 StateTerminal BO4 N/A x x N/A x x N/A N/A N/A N/A N/A
4 StateTerminal BO3 x x xxxxN/AN/AN/AN/AN/A
5 StateTerminal BO5 x x xxxxxxxxx
6 FanLow x x xxxxxxxxN/A
7 FanMed xxxxxxxxxxN/A
8 FanHigh x x xxxxxxxxx
9 UI3Status xxxxxxxxxxx
10 BI2Status xxxxxxxxxxx
11 BI1Status xxxxxxxxxxx
12 LocalPIRMotion xxxxxxxxxxx
13 ServiceAlarm xxxxxxxxxxx
14 FilterAlarm xxxxxxxxxxx
15 Window Opened x x xxxxxxxxx
16 Dehumidification Active N/A N/A x N/A N/A x N/A x N/A x N/A
18 nvoTerminalLoad XXXXXXXXXXX
1: SNVTs: Standard Network Variables Types
2: SCPTs: Standard Configuration Parameters Types

5
Model Number
VT7300A5x21E
VT7300C5x21E
VT7350C5x21E
VT7305A5x21E
VT7305C5x21E VT7355C5x21E
VT7300F5x21E VT7350F5x21E VT7305F5x21E VT7355F5x21E
VT7300M5x21E
No
Sub
Point Name
N/A: Not applicable on this model
19 nciSetpoints XXXXXXXXXXX
1 occupied_cool xxxxxxxxxxx
2 standby_cool xxxxxxxxxxx
3 unoccupied_cool xxxxxxxxxxx
4 occupied_heat xxxxxxxxxxx
5 standby_heat xxxxxxxxxxx
6 unoccupied_heat xxxxxxxxxxx
20 nciRHmodel N/A N/A X N/A N/A X N/A X N/A X N/A
1 RHdisplay N/A N/A x N/A N/A x N/A x N/A x N/A
2 RHsetpoint N/A N/A x N/A N/A x N/A x N/A x N/A
3 DehumHyst N/A N/A x N/A N/A x N/A x N/A x N/A
4 DehumCool N/A N/A x N/A N/A x N/A x N/A x N/A
5 RHcalib N/A N/A x N/A N/A x N/A x N/A x N/A
21 nciGenOpt XXXXXXXXXXX
1 Control Type N/A x x N/A x x N/A N/A N/A N/A N/A
2 DriveTime xxxxxxN/AN/AN/AN/AN/A
3 Cycles Per Hour x x xxxxN/AN/AN/AN/AN/A
4 Reverse Acting Output N/A N/A N/A N/A N/A N/A x x x x x
5 BI1 xxxxxxxxxxx
6 BI2 xxxxxxxxxxx
7 UI3 xxxxxxxxxxx
8 Menu Scroll x x xxxxxxxxx
9 AutoMode xxxxxxxxxxN/A
10 TemperatureScale xxxxxxxxxxx
11 Pipes # Main out config x x xxxxxxxxx
12 Sequence of Operation x x xxxxxxxxN/A
13 Fan Menu Sequence x x xxxxxxxxN/A
14 Heat Maximum setpoint x x xxxxxxxxx
15 Cool Minimum setpoint x x xxxxxxxxx
16 SetpointType x x xxxxxxxxx
17 TemporaryOccTime xxxxxxxxxxx
18 Deadband x x xxxxxxxxx
19 Calibration Room Sensor x x xxxxxxxxx
20 Auxiliary Contact Config x x xxxxxxxxx
21 Reheat Time Base x x xxxxxxxxx
22 FanMode xxxxxxxxxxx
23 PIR Stand-By Timer x x xxxxxxxxx
24 PIR Unoccupied Timer x x xxxxxxxxx
22 nciSccModel XXXXXXXXXXX
1 Thermostat Model x x xxxxxxxxx
2 SoftwareVersion xxxxxxxxxxx
23 nciHvacType XXXXXXXXXXX
24 nciSndHrtBt XXXXXXXXXXX
25 nciMinOuttM XXXXXXXXXXX
26 nciRcvHrtBt XXXXXXXXXXX
27 nciMajVer XXXXXXXXXXX
28 nciMinVer XXXXXXXXXXX

6
Input Network Variables (nvi’s) Description
Parameter Variable Name Function
Room
Temperature
network input
SNVT_temp_p
nviSpaceTemp
This input network variable provides a network remote temperature
value to the thermostat. When linked of written to, the internal
temperature reading (internal sensor) is no longer used.
Valid Range: 40 to 122°F (-40 to 50°C)
Default Null (release) Value: 621.81°F (327.67°C or 0x7FFF)
This network variable is subject to the Receive HeartBeat Time,
nviRcvHrtBt.
Outdoor Air
Temperature
network input
SNVT_temp_p
nviOutdoorTemp
This input network variable provides outdoor air temperature
information to the thermostat from a network value temperature
value. The device will automatically display the value on its display
when linked.
Valid Range: 40 to 122°F (-40 to 50°C)
Default Null (release) Value: 621.81°F (327.67°C or 0x7FFF)
Occupied
Cool & Heat
Setpoints
network Input
SNVT_temp_p
nviSetpoint
This input network variable is used to allow the occupied
temperature setpoints only to be changed via the network from a
single analog value. (Note: the Stand-By and Unoccupied setpoints
are not changed). The corresponding heating and cooling values
are derived from the minimum deadband configuration value
Default Null Value: 621.81°F (327.67°C or 0x7FFF)
Ex. If the minimum deadband configuration value = 2 °F and
nviSetpoint = 70°F.
•The resulting Occupied heating setpoint will equal 69 °F which is
derived from 70 °F minus _ the minimum deadband configuration
value of 2 °F
•The resulting Occupied cooling setpoint will equal 71 °F which is
derived from 70 °F plus _ the minimum deadband configuration
value of 2 °F
Room
Humidity
network input
SNVT_lev_percent
nviSpaceRH
This input network variable is the measured room humidity in
percent monitored by the thermostat.
Valid Range: 5 to 90%
Default Null Value: +163.835 (0x7FFF)
This network variable is subject to the Receive HeartBeat Time,
nviRcvHrtBt

7
Parameter Variable Name Function
This input network variable is used to connect an external fan
speed switch to the node or to allow any supervisory device to
override the fan speed controlled by the node’s control algorithm.
This input is used in conjunction with FanMenu bit in nciGenOpts.
Default Null Value: AUTO (state = 0xFF)
Valid Range:
Fan
Menu
Value
State Value Equivalent
Percent
Requested Speed
0N/A N/A Off - Not Used
10 0% Off - Not Used
11 to 66 0.5 to 33% Low
167 to 133 33.5 to 66.5% Medium
1134 to 200 67 to 100% High
1201 to 255 100% 3 – Not Used
0
0xFF N/A N/A Auto – Not Used
0 n/ N/A Off – Not Used
1 0 0% Off – Not Used
1 0 to 100 0.5 to 50% Low
1 101 to 200 50.5 to 100% High
1 201 to 255 100% 2 – Not Used
1
0xFF N/A N/A Auto – Not Used
0 N/A N/A Off - Not Used
1 0 0% Off - Not Used
1 1 to 66 0.5 to 33% Low
1 67 to 133 33.5 to 66.5% Medium
1 134 to 200 67 to 100% High
1 201 to 255 100% 3 – Not Used
2
0xFF N/A N/A Auto
0 n/ N/A Off – Not Used
1 0 0% Off – Not Used
1 0 to 100 0.5 to 50% Low
1 101 to 200 50.5 to 100% High
1 201 to 255 100% 2 – Not Used
3
0xFF N/A N/A Auto
0 n/ N/A Off – Not Used
1 0 0% Off – Not Used
1 1 to 200 0.5 to 100% On (High)
1 201 to 255 100% On – Not Used
Fan Mode network input
SNVT_switch
nviFanSpeedCmd
4
0xFF N/A N/A Auto
This input network variable is used to enable or disable the
auxiliary heat stage.
This input is used in conjunction with nviHeatCool and SeqOper.
Default Null Value: AUTO (state = 0xFF)
Set value to 100% for both On & Off state
Valid Range:
State Value Auxiliary Heat Operation
0 N/A Disabled – Not Used
1 0 % Disabled
1 1 to 99% Partially Enabled – Not Used
1 100% Enabled
Sequence of
Operation
network input
SNVT_switch
nviAuxHeatEnable1
See note 1 below
0xFF N/A Enabled (invalid)

8
Parameter Variable Name Function
This input network variable is used to command the Space
Comfort Controller into different occupancy modes. It is typically
set by a supervisory node to remotely control the occupancy
modes to override the local occupancy routines of the thermostat.
Default Null Value: OC_NUL = 0xFF
Valid Range:
0 = OC_OCCUPIED *
1 = OC_UNOCCUPIED )
2 = OC_BYPASS – Not Used
3 = OC_STANDY – Not Used
Occupancy network input
SNVT_occupancy
nviOccManCmd
0xFF = OC_NUL (Release to internal occupancy)**
* OC_OCCUPIED and OC_UNOCCUPIED commands will
always have full authority over the local occupancy routines
of the thermostat may they be a local input or a PIR cover.
** OC_NUL command will release the thermostat to use its
own internal occupancy routine driven from one of the digital
input or a PIR cover installed on board.
This network variable input is used to coordinate the Space
Comfort Controller with any node that may need to control the
heat/cool changeover of the unit.
This input is used in conjunction with nviHeatCool and SeqOper.
Default Null Value: HVAC_AUTO.
This network variable is subject to the receive heartbeat time,
nciRcvHrtBt
Valid Range:
0 = HVAC_AUTO
1 = HVAC_HEAT
2 = HVAC_MRNG_WRMUP – Not Used
3 = HVAC_COOL
4 = HVAC_NIGHT_PURGE – Not Used
5 = HVAC_PRE_COOL – Not Used
6 = HVAC_OFF
7 = HVAC_TEST – Not Used
8 = HVAC_EMERG_HEAT – Not Used
9 = HVAC_FAN_ONLY – Not Used
12 = HVAC_MAX_HEAT – Not Used
13 = HVAC_ECONOMY – Not Used
14 = HVAC_DEHUMID – Not Used)
15 = HVAC_CALIBRATE – Not Used)
System Mode network input
SNVT_hvac_mode
nviApplicMode
0xFF = HVAC_NUL – Not Used

9
Parameter Variable Name Function
This network variable input is used to coordinate the Space
Comfort Controller with any node that may need to control the
heat/cool changeover of the unit. This input is overridden by
nviApplicMode, unless nviApplicMode is HVAC_AUTO. If
nviApplicMode is HVAC_AUTO, then nviHeatCool determines the
effective mode of the unit.
Default Null Value: HVAC_AUTO.
This network variable is subject to the receive heartbeat time,
nciRcvHrtBt
Valid Range:
0 = HVAC_AUTO
1 = HVAC_HEAT
2 = HVAC_MRNG_WRMUP – Not Used
3 = HVAC_COOL
4 = HVAC_NIGHT_PURGE – Not Used
5 = HVAC_PRE_COOL – Not Used
6 = HVAC_OFF
7 = HVAC_TEST – Not Used
8 = HVAC_EMERG_HEAT – Not Used
9 = HVAC_FAN_ONLY – Not Used
12 = HVAC_MAX_HEAT – Not Used
Sequence of
operation
network input
SNVT_hvac_mode
nviHeatCool1
See note 1 below
0xFF = HVAC_NUL – Not Used
This network variable input is used to enable or disable user
access to thermostat
Default Null Value: Level 0.
Valid Range:
Level Occupied
Temperature
Setpoints
System
Mode
Settings
Fan Mode
Settings
Unoccupied
Override
0 Yes access Yes access Yes access Yes access
1 Yes access Yes access Yes access No access
2 Yes access No access No access Yes access
3 Yes access No access No access No access
4 No access No access No access Yes access
Lockout network input
UNVT_nvi/nvo
nviRemLockout
5 No access No access No access No access
This network variable input is used to enable or disable
dehumidification
Default Null Value: Dehumidification not allowed
Set value to 100% for both On & Off state
Valid Range:
State =0 = Dehumidification not allowed (Thermostat’s default
value)
DhumiLCK network input
UNVT_nvi/nvo
nviDhumiLCK
State = 1 = Dehumidification allowed
This network variable input is used remotely command the
Auxiliary Output (BO5).
NOTE Auxiliary Contact configuration NEEDS to be set to 5 for this
function to operate ( 5 = Output to follow secondary network
occupancy command )
Set value to 100% for both On & Off state
Default Null Value: Auxiliary contact Off
Valid Range:
State = 0 = Auxiliary contact Off (Thermostat’s default value)
Aux contact network input
UNVT_nvi/nvo
nviAuxOut
State = 1 = Auxiliary contact On

10
Output Network Variables (nvo’s) Description
All output network variables will be updated no faster than the Minimum Send Time (nciMinOutTm) configuration value.
An output network variable will be transmitted immediately when its value has changed significantly (manufacturer’s
defined). Additionally, this variable will also be transmitted as a heartbeat output on a regular basis as dictated by the
Maximum Send Time (nciSndHrtBt) configuration value.
Parameter Variable Name Function
Room
Temperature
network output
SNVT_temp_p
nvoSpaceTemp
This output network variable is used to monitor the effective space
temperature sensor that the Space Comfort Controller is using for
control. This output echoes the value of the input.
Valid Range: 14 to 122°F (-10 to 50°C)
The value 621.07°F (327.67°C or 0x7FFF) will be sent as an
invalid value in case of a sensor failure.
Supply
Temperature
network output
SNVT_temp_p
nvoDischAirTemp
This output network variable is used to monitor the temperature of
the air that leaves the Space Comfort Controller
NOTE: UI3 needs to be configured to (SS) Supply air sensor
monitoring
Valid Range: -40 to 122°F (-40 to 50°C)
The value 621.81°F (327.67°C or 0x7FFF)will be sent as an invalid
value in case of a sensor failure.
Room
Humidity
network output
SNVT_lev_percent
nvoSpaceRH
This output network variable indicates the space humidity in
percent.
Valid Range: 0 to 100%.
The value 0x7FFF = +163.835% will be set as an invalid value to
indicate a humidity sensor failure.
This output network variable is used to indicate the actual
occupancy mode of the unit. This information is typically reported
to a supervisory controller or provided to another Space Comfort
Controller to coordinate the operation of multiple units
Valid Range:
0 = OC_OCCUPIED
1 = OC_UNOCCUPIED
2 = OC_BYPASS1
Occupancy network output
SNVT_occupancy
nvoEffectOccup
3 = OC_STANDBY
Note 1: OC_BYPASS can be initiated by either nviOccManCmd or a
local input. NvoEffectOccup will only be in OC_BYPASS for the
duration of the ToccTime (nciGenOpts), until reinitiated by either a
transition of the local input or an update to nviOccManCmd.
This output network variable is available to report the Space
Comfort Controller status. It combines the operating mode, the
capacity of heating and cooling used and an indication if any
alarms are present in the object.
Sub Name Valid Value
01 mode HVAC_AUTO
HVAC_HEAT
HVAC_MRNG_WRMUP – Not Used
HVAC_COOL
HVAC_NIGHT_PURGE – Not Used
HVAC_PRE_COOL – Not Used
HVAC_HVAC_OFF
HVAC_HVAC_TEST – Not Used
Unit Status
network
output
SNVT_hvac_status
nvoUnitStatus
HVAC_HVAC_EMERG_HEAT – Not Used

11
Parameter Variable Name Function
Sub Name Valid Value
HVAC_FAN_ONLY – Not Used
HVAC_MAX_HEAT – Not Used
02: heat_output
_primary
0-100%, 0x7FFF (Invalid)
03 heat_output
_secondary
Not Used
04 cool_output: 0-100%, 0x7FFF (Invalid)
05 econ_output Not Used
06 fan_output 0-100%, 0x7FFF (Invalid)
07 In_alarm 0 (No alarms)
1 (Alarm On)
Unit Status
network
output
SNVT_hvac_status
nvoUnitStatus
0x7FF (Alarming disabled) – Not Used
This network variable output is used to report the Space Comfort
Controller inputs’ and outputs’ status.
Sub Name Valid value Default Value
01 StateTerminal BO2 0 = Off
1 = On
0 = Off
02 StateTerminal BO1 0 = Off
1 = On
0 = Off
03 StateTerminal BO4 0 = Off
1 = On
0 = Off
04 StateTerminal BO3 0 = Off
1 = On
0 = Off
05 StateTerminal BO5 0 = Off
1 = On
0 = Off
06 FanLow 0 = Off
1 = On
0 = Off
07 FanMed 0 = Off
1 = On
0 = Off
08 FanHigh 0 = Off
1 = On
0 = Off
09 UI3 Status -40 to 122 °F
(-40 to 50°C)
40°F = Open
122°F = Close
N/A
10 BI2 Status 0 = activated
1 = not activated
1 = not activated
11 BI1 Status 0 = activated
1 = not activated
1 = not activated
12 Local PIR Motion 0 = No motion
1 = Motion
0 = No motion
13 Service Alarm 0 = No alarm
1 = Alarm on
0 = No alarm
14 Filter Alarm 0 = No alarm
1 = Alarm on
0 = No alarm
15 Window Opened 0 = No alarm
1 = Alarm on
0 = No alarm
Thermostat’s
I/O status
network output
UNVT_fc_thermo_
state
nvoSccStatus
16 Dehumidification
Active
0 = Off
1 = On
0 = Off
Heating/
Cooling
demand
network output
SNVT_lev_percent
nvoTerminalLoad
This output indicates the current heat/cool energy demand of the
unit. Positive values indicate that cooling energy is in use by the
space comfort controller, while negative values indicate that
heating energy is in use by the space comfort controller.
Valid Range: -100% to 100%

12
Configuration Properties (nci’s) Description
Parameter Variable Name Function
This configuration property defines the space temperature
setpoints for various heat, cool and occupancy modes.
Valid Range and Default values:
Sub Name Valid Range Default value
01 occupied_cool 54 to 100°F
(12 to 37.5°C)
75°F (24.0°C)
02 standby_cool 54 to 100°F
(12 to 37.5°C)
78°F (25.5°C)
03 unoccupied_cool 54 to 100°F
(12 to 37.5°C)
80°F (26.5°C)
04 occupied_heat 40 to 90°F
(4.5 to 32°C)
72°F (22.0°C)
05 standby_heat 40 to 90°F
(4.5 to 32°C)
69°F (20.5°C)
Temperature
Setpoints
network input config
SNVT_temp_setpt
nciSetPts
06 unoccupied_heat 40 to 90°F
(4.5 to 32°C)
62°F (16.5°C)
This configuration property defines the space humidity parameters
and their settings.
Valid Range and Default values:
Sub Name Valid Range Default value
01 RHdisplay 0 = Not active
1 = Active
0
02 RHsetpoint 30 to 100% RH 50% RH
03 DehumHyst 2 to 20% RH 5% RH
04 DehumCool 20 to 100% RH 100% RH
RH options network input config
UNVT_gen_opts
nciRHmodel
05 RHcalib -15 to +15% RH 0% RH
This configuration property defines the thermostat’s common
configuration parameters and their settings.
Valid Range and Default values:
Sub Name Valid Range Default value
01 Control Type 0 = On/Off Control
1 = Floating Control
0
02 Drive Time 0.5 to 9 minutes (0.5
increments)
3 minutes
03 Cycles Per Hour 3, 4, 5, 6, 7 and 8 CPH 4 CPH
04 ReverseActing
Output
0 = Direct Acting (DA)
1 = Reverse Acting (RA)
0
05 BI1 0 = None
1 = Rem NSB
2 = Motion NO
3 = Motion NC
4 = Window
0
06 BI2 0 = None
1 = Door Dry
2 = Override
3 = Filter
4 = Service
0
07 UI3 0 = None
1 = COC/NH
2 = COC/NC
3 = COS
4 = SS
0
Thermostat’s
common
configuration
parameters
network input
config
UNVT_fc_gen_opts
nciGenOpts
08 Menu Scroll 0 = No Scroll
1 = Scroll Active
1

13
Parameter Variable Name Function
Sub Name Valid Range Default value
09 Auto Mode 0 = Not Active
1 = Active
0
10 Temperature
Scale
0 = °C
1 = °F
°F
11 Pipes # Main
out config
2 = 2 pipe
4 = 4 pipe
4 pipe
12 Sequence of
Operation
0 = Cooling Only
1 = Heating Only
2 = Cooling & Reheat
3 = Heating & Reheat
4 = Cooling/Heating 4 pipes
5 = Cooling /Heating 4 pipes
& Reheat
1 = Heating
Only
13 Fan Menu 0 = Low-Med-High
1 = Low-High
2 = Low-Med-High-Auto
3 = Low-High-Auto
4 = On-Auto
4 = On-Auto
14 Heat
Maximum
Setpoint
40 to 90°F
(4.5 to 32°C)
90°F (32°C)
15 Cool Minimum
Setpoint
54 to 100°F
(12 to 37.5°C)
54°F (12°C)
16 Setpoint Type 0 = Permanent
1 = Temporary
0
17 Temporary
Occ Time
0, 1, 2, 3, up to 24 hours 2 hours
18 Deadband 2, 3, 4 or 5 °F
(1 to 2.5°C)
2°F (1°C)
19 Calibration
Room Sensor
± 5°F (±2.5°C) 0°C
20 Auxiliary
Contact Config
0 = Aux Contact used for
reheat
1 = Aux NO with occupancy
2 = Aux NC with occupancy
3 = Aux NO with occupancy
& Fan On
4 = Aux NC with occupancy
& Fan On
5 = Remote control
nviAucOut
0
21 Reheat Time
Base
0 = 15 minutes
1 = 10 seconds
0
22 Fan Mode 0 = Low
1 = Med
2 = High
3 = Auto
4 = On
Depending on
Fan Menu
Selected
23 PIR Stand-By
Timer
0.5 to 24.0 Hours 0.5 Hours
Thermostat’s
common
configuration
parameters
network input
config
UNVT_fc_gen_opts
nciGenOpts
24 PIR
Unoccupied
Timer
0.0 to 24.0 Hours 0.0 Hours

14
Parameter Variable Name Function
This configuration property defines model number and software
version of the thermostat
Valid Range and Default values:
Sub Name Valid Range Default value
01 Thermostat
Model
41 = VT7300A1000E
42 = VT7305A1000E
43 = VT7350C1000E
44 = VT7300C1000E
45 = VT7355C1000E
46 = VT7305C1000E
47 = VT7350F1000E
48 = VT7300F1000E
49 = VT7355F1000E
50 = VT7305F1000E
51 = VT7350M1000E
Depend on model
being used
Thermostat’s
model number
network input config
UNVT_model_number
nciSccModel
02 Software
Version
00
This configuration property helps the user identify the type of
equipment being monitored.
Valid Range:
Sub Identifier Name
HVAC Unit-
Type Identifier
network input config
SNVT_hvac_type
nciHvacType
0
1
2
3
4
5
6
7
8
9
HVT_GENERIC – Not Used
HVT_FAN_COIL
HVT_VAV – Not Used
HVT_HEAT_PUMP– Not Used
HVT_ROOFTOP – Not Used
HVT_UNIT_VENT – Not Used
HVT_CHIL_CEIL – Not Used
HVT_RADIATOR – Not Used
HVT_AHU – Not Used
HVT_SLF_CONT – Not Used
Generic
Fan Coil
Variable Air Volume Terminal
Heat Pump
Rooftop Unit
Unit Ventilator
Chilled Ceiling
Radiator
Air Handling Unit
Self-Contained Unit
Maximum
Send Time
network input config
SNVT_time_sec
nciSendHrtBt
This configuration property defines the maximum period of that
expires before the specified network variable outputs will
automatically be updated
Valid Range: 0 sec. to 6553.4 sec.. Setting nciSendHrtBt to 0
disables the Send Heartbeat mechanism.
Default Null Value : 0.0 sec (no automatic update)
Minimum
Send Time
network input config
SNVT_time_sec
nciMinOutTm
This configuration property defines the minimum period of time
between automatic network variable outputs transmissions.
Valid Range: 0 sec. to 6553.4 sec.. Setting nciRcvHrtBt to 0
disables the Minimum Send Time mechanism.
Default Null Value : 0.0 sec (no minimum send time)
Minimum
Receive Time
network input config
SNVT_time_sec
nciRcvHrtBt
This configuration property is used to control the maximum time
that elapses after the last update to a specified network variable
input before the Space Comfort Controller starts to use its default
values.
Valid Range: 0 sec. to 6553.4 sec.. Setting nciRcvHrtBt to 0
disables the Receive Heartbeat mechanism.
Default Null Value : 0.0 sec (no failure detected)
Hardware or
Software
revisions
network input config
SCPT_maj_ver
nciMajVer
This configuration property defines the major module hardware
and software revisions.
Valid Range: 0 to 255
Hardware or
Software
revisions
network input config
SCPT_min_ver
nciMinVer
This configuration property defines the minor module hardware
and software revisions.
Valid Range: 0 to 255

15
Note 1:
How to use nviHeatCool, nviAuxHeatEnable and SeqOpera (Sequence of Operation) variables:
Current
nviHeatCool
NviAuxHeat
Enable =
Enabled
NviAuxHeat
Enable =
Disabled
Current SeqOpera If nviHeatCool
changed to:
New SeqOpera
2 Pipe Application
3 = HVAC_COOL X0 = Cooling Only 1= HVAC_HEAT 1 = Heating Only
3 = HVAC_COOL X2 = Cooling & Reheat 1= HVAC_HEAT 3 = Heating & Reheat
1 = HVAC_HEAT X1 = Heating Only 3= HVAC_COOL 1 = Cooling Only
1 = HVAC_HEAT X3 = Heating & Reheat 3= HVAC_COOL 2 = Cooling & Reheat
4 Pipe Application
3 = HVAC_COOL X0 = Cooling Only 0= HVAC_AUTO
1= HVAC_HEAT
4 = Cool/Heat 4 Pipes
1 = Heating Only
3 = HVAC_COOL X2 = Cooling & Reheat 0= HVAC_AUTO
1= HVAC_HEAT
5 = Cool/Heat 4P & Reheat
3 = Heating & Reheat
1 = HVAC_HEAT X1 = Heating Only 0= HVAC_AUTO
3= HVAC_COOL
4 = Cool/Heat 4 pipes
1 = Cooling Only
1 = HVAC_HEAT X3 = Heating & Reheat 0= HVAC_AUTO
3= HVAC_COOL
5 = Cool/Heat 4P & Reheat
2 = Cooling & Reheat
0 = HVAC_AUTO X4 = Cool/Heat 4 Pipes 1= HVAC_HEAT
3= HVAC_COOL
1 = Heating Only
0 = Cooling Only
0 = HVAC_AUTO X5 = Cool/Heat 4P &
Reheat
1= HVAC_HEAT
3= HVAC_COOL
3 = Heating & Reheat
2 = Cooling & Reheat

16
Integration – Global Commands
The following figure shows, which objects from the thermostat, can be monitored and commanded from the BAS front-
end.
Figure 1: Global commands from a BAS front-end to a VT7300 series tstat
Integration – Graphic User Interface (GUI) Objects
The following objects should be typically used in a GUI:
nvoSpaceTemp
occupied_heat (nciSetpts);
unoccupied_heat (nciSetpts);
occupied_cool (nciSetpts);
unoccupied_cool (nciSetpts);
nvoSpaceRH
RHsetpoint (nciRHmodel);
nvoOutdoorTemp
nvoDischAirTemp
nviOccManCmd
nvoEffectOccup
heat_output_primary (nvoUnitStatus)
cool_output (nvoUnitStatus)
ServiceAlarm (nvoSccStatus)
FilterAlarm (nvoSccStatus)
WindowOpened (nvoSccStatus)

17
Figure 2: Graphical User Interface (GUI) example of a Fan-Coil system

18
Configuration Objects
The following SNVT and UNVT should be typically used for configuration purposes:
nciGenOpts;
nciRHmodel;
nciSetpoints;
Wiring Guide
Overview
For clarity we will use the term “Device” to represent any product with an active Echelon network connection, including
TACO and non-TACO controllers.
Summary Specifications:
Parameter Details
Network Wiring 24 to 16AWG, twisted pair
Maximum total wire length11600 feet (500 meters) in free topology
Maximum device-to-device distance 1600 feet (500 meters) in free topology
Polarity Polarity insensitive
Multi-drop Free Topology
Termination for Free Topology Network Segment One RC network with Ra = 52.3Ω±1%, 1/8W
Termination for Doubly Terminated Bus Network
Segment
Two RC network with Ra = 105Ω±1%, 1/8W
Number of transceivers per segment Up to 64
Baud rate 78000 bits per second
1Network segment length varies depending on wire type.
Table 1: Summary of Specifications for a TACO ’ LON Network
Network Configuration
The Echelon network is designed to support free topology wiring and will accommodate bus, star, loop or any of these
topologies. Echelon devices can be located at any point along the network wiring.
Figures 3.1 to 3.5 present five different network topologies. The actual termination circuit will vary by application.

19
Maximum Number Of Devices
Up to 64 transceivers are allowed per network segment. If your network requires more than 64 transceivers a repeater is
then required to extend your network

20
Maximum Cable Length
The maximum length of a chain is related to its transmission speed. The longer the chain, the slower the speed.
Using proper cable, Echelon supports a baud rate of 78 kilobits per second for distances up to 1600-ft (500 m) in free
topology and 8800 ft (2700 m) in bus topology with double terminations.
If you require a maximum network length of more than 1600-ft (500 m) or 8800 ft (2700 m), then a repeater is
required to extend the network.
Repeater
In the event that the limits on the number of transceivers or total wire distance are exceeded, a physical layer
repeater can be added to interconnect two or more network segments. A repeater will double the overall channel
capability, including node count and network extent, but not bandwidth. Note that only one physical layer repeater
should be placed in series between any two nodes on a channel. If additional cabling or network bandwidth is
required, then a LonWorks Router should be used in place of a repeater.
Terminators
Echelon network segments requires termination for proper data transmission performance. The type of terminator varies
depending on whether shielded or unshielded cable is used. Free topology and Bus networks also differ in their
termination requirements. The following sections describe the various terminators and terminations procedure.
Free Topology Network Segment
In a free topology segment, only one termination is required and may be placed anywhere on the free topology
segment. There are two choices for the termination:
1. RC network with Ra = 52Ω±1%, 1/8W
2. LPI-10 Link Power Interface, with jumper at “1 CPLR” setting.
Doubly Terminated Network Segment
In a doubly terminated bus topology, two terminations are required, one at each end of the bus. There are two
choices for each termination:
1. RC network with Ra = 105Ω±1%, 1/8W
2. LPI-10 Link Power Interface, with jumper at “2 CPLR” setting.
Only one LPI-10 interface is supported per segment. The other terminator must be an RC-type.
Grounding Shielded Twisted Pair Cable
When using Shielded Twisted Pair, terminate the twisted pair as listed in the previous section and ground the
cable shield by using a capacitor, to tie the shield to earth ground, and a large-value resistor to bleed off any
static charge on the shield. Tying the shield to earth ground through a capacitor will avoid DC and 50/60Hz
ground paths from being formed through the shield. Typical values for resistor and capacitor are as follows:
Capacitor = 0.1μF, 10%, Metalized Polyester, ≥100V
Resistor = 470kΩ, 1/4W, ±5%
The cable shield should be grounded at least once per segment, and preferably at each node. Grounding the
shield at every node will assist in suppressing 50/60Hz standing waves.