ComfortVu
TM
BACnet Thermostat Standard
Model TB-24-HM (24 Vac model)
Installation and Operation Guide
CARRIER CORPORATION ©2019
A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No. 11-808-723-01 · 5/22/2019
Table of Contents
Overview ………………………………………………………………………………………………………………………………..…. 4
Specifications ………………………………………………………………………………………………………………………..… 5-6
TB-24-HM Dimensions ……………………………………...………………….……………………………………………………..… 7
Operating instructions ……………………………………………………………………………………………………………..…… 8
Quick guide …………………………………………………………………………………………………………………..…….. 8
Turning the thermostat ON and OFF……………………………………………………………………………………....…….. 9
Selecting temperature scale………………………………………………………………………………………………..….…. 9
Adjusting the Setpoint temperature (for 1 setpoint and 2 setpoints configurations) ………………………………….……. 9
Selecting system mode…………………………………………………………………………………………………….…..… 10
Selecting Fan speeds (for 2 and 3 fan speeds configuration) ……………………………………………….……….…...… 10
Turning Auto fan ON or OFF (fan on demand) ………………………………………………………….….………….…...… 10
Locking the thermostat buttons ………………………………………………………………………………………….……… 10
Economy mode ………………………………………………………………………………………….…………….……...….. 11
Freeze Protection …………………………………………………………………………………………………….…...……... 11
Economizer ………………………………………………………………….……………………………………………………. 12
Weekly program ………………………………………………………………………………………….………………...……..… 13-17
MAC Address and BACnet Device Instance Number …………………………………………………………...….….……...… 18
Installation ………………………………………………………………………………………….………………………………....… 19
General ……………………………………………………………………………………...….…….….……………………..… 19
PIR detection area ……………………………………………………………………………………...….………..……...…… 19
Wiring terminals …………………………………………………………………………………….……………………....….… 20
DIP switch and jumper configurations………………………………………………...……………………....…….….……… 21
AC configurations ………………………………………………………………………………...……...….…….….…………. 22
FC configurations for 2-pipe systems …………………………………………………………………………………...……. 23
FC configurations for 4-pipe systems / Floor heating……………………………………………………...….…….….……. 24
Wiring and DIP switch configurations ………………………………………………………………………….………….. 25-39
Technician Settings ……………………………………………………………………………………...….……………...…….. 40-46
P01 – Offset for temperature readings calibration
P02 – Setpoint limit for cooling
P03 – Setpoint limit for heating
P04 – Lock the [Fan] button
P05 – Lock the [Mode] button
P06 – Lock the [On/Off] button
P07 – Lock the [+] and [-] buttons (Set buttons)
P08 – Functionality of T1 terminals
P09 – Functionality of IN1,0 terminals
P10 – Window contact (terminals IN1,0) polarity
P11 – Window contact delay time
P12 – Door switch (terminals T1,0) polarity
P13 – Door switch delay time
P14 – Enable/Disable Auto change over mode
P15 – Motion sensor logic (PIR)
P16 – Enable/Disable Motion sensor
P17 – PIR (Motion sensor) delay time
P18 – Door switch or key tag configuration
P19 – PIR (Motion sensor) polarity
P25 – Economy setpoint for cooling
P26 – Economy setpoint for heating
P27 – On-delay time on-delay between
heating stages
P28 – Off-delay time between heating stages
P29 – LCD Backlight ON or OFF
P30 – Beeper ON or OFF
P31 – Fan ON delay in cooling
P32 – Fan OFF delay in cooling
P33 – Fan ON delay in heating
P34 – Fan OFF delay in heating
P35 – Enable/Disable Freeze protection
P36 – Freeze protection cut-in setpoint
P37 – Freeze protection cut-out setpoint
P40 – View filter counter (hours) – Read only
P41 – Reset filter time
P42 – Adjust filter alarm delay counter (hours)
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Table of Contents
Technician Settings ……………………………………………………………………………………...….……………...…….… 47-62
P43 – Soft start in heat – cut-in temperature
P44 – Soft start in heat – cut-out temperature
P45 – Cool differential band
P46 – Cool differential band offset
P47 – Heat differential band
P48 – Heat differential band offset
P49 – Shift between Cool and Heat in Auto mode
P50 – Shift between Cooling stages
P51 – Shift between Heating stages
P52 – Cool valve proportional band
P53 – Cool proportional low limit
P54 – Cool proportional high limit
P55 – Heat valve proportional band
P56 – Heat proportional low limit
P57 – Heat proportional high limit
P60 – Proportional ON percent
P61 – Proportional OFF percent
P63 – Time on-delay between cooling stages
P64 – Time off-delay between cooling stages
P65 – Fan VFS proportional band in cooling
P66 – Fan VFS proportional band in heating
P67 – Fan VFS Low speed percent in cooling
P68 – Fan VFS Medium speed percent in cooling
P69 – Fan VFS High speed percent in cooling
P70 – Fan VFS Low speed percent in heating
P71 – Fan VFS Medium speed percent in heating
P72 – Fan VFS High speed percent in heating
P74 – VFS Medium speed differential
P75 – VFS High speed differential
P76 – Fan VFS Low limit in cooling
P77 – Fan VFS High limit in cooling
P78 – Fan VFS Low limit in heating
P79 – Fan VFS High limit in heating
P83 – View T2 temperature sensor readings
P84 – View T3 temperature sensor readings
P85 – De-ice in cool – cut-in temperature
P86 – De-ice in cool – cut-out temperature
P87 – De-ice in heat time
P88 – De-ice in heat break time
P89 – De-ice in heat – cut-in temperature
P90 – De-ice in heat – cut-out temperature
P91 – Compressor delay
P98 – Display setpoint only (hide room temperature)
P99 – One or Two setpoints
P101 – Screen dimming delay
P107 – Weekly program configuration
P108 – Weekly program - events per day
P109 – Weekly program event configuration
P111 – PIR Sensitivity
P114 – Cool PID Kp
P115 – Heat PID Kp
P116 – Cool PID Ki
P117 – Heat PID Ki
P118 – Cool PID Kd
P119 – Heat PID Kd
P122 – Cool Proportional output threshold in cooling
P123 – Heat Proportional output threshold in cooling
P160 – Minimum compressor ON time
P161 – Minimum compressor OFF time
P170 – Economizer low limit temperature
P187 – Display or hide humidity reading
P188 – Room temperature limit for disabling
dehumidification in unoccupied mode
P189 – Dehumidification cycle in unoccupied mode
P190 – Dehumidification break time in unocc. mode
P192 – Temperature setpoint for re-heat in
unoccupied mode
P193 – Display switching time (between temperature
and humidity)
P194 – Humidity differential band
P195 – Humidity sensor reading offset
P196 – Dead zone between humidification and
dehumidification
P197 – Humidity setpoint
P198 – Not in use
P200 – Restore defaults
Alarms and indications ………………………………………………………………………………………………………………… 63
Document revision history ……………………………………………………………………………………..……………..…….… 64
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Overview
The ComfortVu BACnet Thermostat Standard Model TB-24-HM can be used:
TM
As a stand-alone thermostat that can control equipment using built-in logic
As part of an MS/TP network of BACnet Thermostats that can be managed from a BMS front-end system
As part of a BACnet MS/TP network connected to an Carrier BACnet router in an i-Vu
provide trending and alarming of the BACnet Thermostat’s data.
The TB-24-HM thermostat has a white plastic enclosure with an LCD display and buttons for user control. It has on-board
temperature, humidity, and motion sensing, and its on-board inputs and outputs are used to control equipment and optional external
sensing devices. Inputs and outputs are configured using DIP switches and jumpers. The TB-24-HM thermostat requires 24 Vac
power.
See also:
ComfortVu
TM
BACnet Thermostat Points List and Technician Settings
®
system. The router’s control programs
- 4 -
Specifications
Sensing Element: Range Accuracy
Temperature 41° F to 95° F (5° C to 35° C) ±1.0° F (0.5° C)
Humidity 10% to 90 % ±3.0% typical
Motion Sensing:
Sensor Type PIR, quad, omnidirectional
Distance 16.4 feet (5m)
Detection range (HxV) 90° x 30°
Movement speed 2.62 to 3.94 ft/s (0.8 to 1.2 m/s)
Detection object: 15.75 x 9.84 in. (400 x 250 mm)
Power 24 Vac, ±10%, 50-60Hz, 4VA
NOTE Devices connected to outputs, such as a fan, will increase VA requirements.
Communication BACnet MS/TP with baud rates up to 76.8 kbps, detected and set automatically by the
BACnet Thermostat. Max 127 devices.
Inputs T1, 0 – Normally open or normally closed dry contract, or
0-10 Vdc analog input, or
50 kOhm thermistor @ 25°C
A, B - Communication +/- (RS485)
IN1, 0 - Normally open or Normally closed dry contract, or
0-10 Vdc analog input, or
50 kOhm thermistor @ 25°C
C, R - Power: 24 Vac
Outputs 11, 12, 13 – Digital outputs, 3A max.
14 – Digital outputs 0.3A max
. 15 and 16 – Depends on application.
Digital output 0.3A max., or
Analog output 0-10 Vdc, 5 mA max., not isolated
Environmental Operating Range 50° to 122°F (10° to 50°C), 10 to 90% relative humidity, non-condensing
Mounting • If using an electrical box, mount the included wallplate to a standard 4" x 2" electrical
box using the two larger mounting screws, then mount the thermostat to
the wallplate using the three smaller mounting screws.
• If not using an electrical box, flush-mount thermostat to wall (no wallplate needed).
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Specifications (cont.)
Weight 4.8 oz (0.14 kg)
Compliance United States of America:
FCC CFR47, Chapter 1, Subchapter A, Part 15, Class B
Canada:
Industry Canada Compliant, ICES-003, Class B
Europe:
Mark, Low Voltage Directive: 2014/35/EU RoHS Compliant: 2011/65/EU
Australia and New Zealand:
C-Tick Mark, AS/NZS 61000-6-3
Title 24 compliant if connected to a BMS with custom programming for economizer fault
detection.
CA Prop 65 Warning: This product can expose you to chemicals including Styrene and 1,3
- Propane sultone, which are known to the State of California to cause cancer. For more
information, go to www.p65warnings.ca.gov.
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TB-24-HM Dimensions
- 7 -
Operating instructions
Quick guide
Temperature/Humidity
indications:
Temperature scale
Ambient Humidity
Setpoint adjust.
Ambient/Setpoint indication
temperature
Ambient humidity indication
Thermostat On/Off indication
System MODE indication:
Fan only
Cooling
Heating
Auto mode
Clock / Weekdays
C/F
Prog
On/Off
Mode Fan
Fan speed indication:
Auto speed
High
Medium
Low
Fan on demand
Indications:
Alarm
Button locked
Program active
Program events indications:
Prog1234
Start
Stop
Clock
Event per day
Adjust start time
Adjust stop time
Adjust the clock
Setpoint adjustment
- Press to switch between
temperature scales (ºC/ºF)
- Press and hold to enter
weekly program settings
- Press and hold to enter
Technician Settings
(setpoint must be equal to
10ºC/50ºF)
- Press and hold to enter
MAC Address settings
(setpoint must be equal to
11ºC/52ºF)
- Press to select Fan speed:
Low/Medium/High/Auto
- Press and hold to activate
fan on demand
- Press to select System
Mode: Cool/Heat/Auto
- Press to turn unit On or Off
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Operating instructions (cont.)
Turning the thermostat ON and OFF
Press the [On/Off] button to turn the thermostat ON or OFF.
Selecting temperature scale
Press the [C/F] button to switch between temperature scales.
Adjusting the Setpoint temperature
In One setpoint configuration:
1. Press the [+] or [-] buttons once to view the setpoint temperature.
2. Press again to adjust the setpoint.
In Two setpoints configuration:
1. Press the [+] or [-] buttons once – “ ” and the setpoint temperature for cooling will
appear on display.
2. Use the [+] or [-] button to adjust the setpoint for cooling.
3. Press the [Mode] button or wait 3 seconds – “ ” and the setpoint temperature for heating
will appear on display.
4. Use the [+] or [-] button to adjust the setpoint for heating.
OFFON
Celsius Fahrenheit
Setpoint
Setpoint
For cooling
Setpoint
For heating
Notes:
The setpoint for cooling must be higher than the setpoint for heating.
For humidity setpoint, see Technician Setting P197.
- 9 -
Operating instructions (cont.)
Selecting system mode
Press the [Mode] button to switch between system modes.
Notes:
During demand for cooling or heating, the active mode will flash.
In Auto mode, the active mode icon (Cool or Heat) will appear on display.
Auto mode is not available in 2-Pipe system configuration.
Selecting Fan speeds (for 2 and 3 fan speeds configuration)
Press the [Fan] button to switch between fan speeds.
Notes:
In Auto speed, the active fan speed icon will appear on display.
Medium speed available in 3 speeds configuration.
Cool Heat
Auto Fan only
Low Medium
Turning Auto fan ON or OFF (fan on demand)
In 1-speed configuration:
Press the [Fan] button to turn Auto fan ON or OFF.
In 2- and 3-speed configurations:
Press and hold the [Fan] button for 7 seconds to turn Auto fan ON or OFF.
When ON, the fan will run on demand for cooling or heating,
When OFF, the fan will run continuously.
Note: Auto fan cannot be selected in Fan only mode.
Locking the thermostat buttons
Press and hold both [-] and [Fan] buttons for 7 seconds to lock or unlock the thermostat buttons.
When locked, the lock icon will appear on display with any attempt to press the buttons.
Enable or disable the option to lock different buttons using Technician Settings P4-P7.
High Auto
Auto fan
Auto fan
OFF
indications
ON
Lock
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Operating instructions (cont.)
Economy mode
Activate Economy mode by triggering a window contact, door switch,
key-tag, remote economy switch, the built-in PIR sensor (passive
infrared sensor), or through communication – binary value
“UnoccupiedByNetwork”.
When Economy mode is active, the thermostat will use special
economy setpoints for cooling and heating set by technician.
See objects “EconomySetpointinHeat” and “EconomySetpointinCool”
in the Technician Settings section of this manual.
Freeze Protection
Economy by window contact
Economy by built-in PIR, by the
remote economy switch, or through
communication
Economy by door switch
Economy by Key-tag
The Freeze protection feature will not allow the room temperature to drop below
predefined cut-in temperature. Depending on which configuration the system is
operating under (W/WO Heat pump), this feature will force the system to operate
in heat mode and activate the fan.
This feature will take effect when the thermostat is either ON or OFF. When the
room temperature rises above the predefined cut-out temperature, the thermostat
will return to its previous state.
When freeze protection is activated, the display alternates between “AL” and
room temperature.
Temperature
Cut-out
Cut-in
Time
Normal work Freeze protection
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Operating instructions (cont.)
Economizer
Economizer is used to reduce the energy consumed by the cooling systems, by using low external air temperatures to assist in the
chilling process. When outdoor temperatures are lower relative to indoor (room) temperatures, the system utilizes the cool outdoor air
as a free cooling source.
The outdoor temperature (Teconomizer) triggering the activation of the economizer, can be measured by the temperature sensor
connected to T1,0 terminals (technician parameter P08="05") or by setting a temperature value manually through communication -
AV#129 "TEconomizerEffective".
When getting the temperature through communication, terminals T1,0 can be used for any other functionality like External sensor/Soft
start in heat sensor/Deicing in cool/Door switch/Key tag.
Whenever there is demand for cooling and the outdoor temperature conditions allow the operation of the economizer, it will operate
together with the regular cooling system and will not replace it.
Economizer will start when both of the following conditions are satisfied:
1.
Teconomizer temperature < Room temperature -
Room Temperature > Setpoint temperature
2.
Cool differential band
2
Economizer will stop when the following condition is satisfied:
Room Temperature < Setpoint temperature -
1.
Cool differential band
2
Economizer
ON
OFF
Teconomizer
Room Temp.
Room Temp.
Setpoint
Cool differential band
Indication for the Economizer operation:
When Economizer is active, the “Cool” symbol will appear (or flash when active)
on display and the “Fan” symbol will flash.
Temperature
Economizer
active
- 12 -
Weekly program
General
Prior to programming, make sure that Technician Settings P107, P108, and P109 are configured correctly.
Program types
The thermostat can be configured to run four different types of weekly programs (set by Technician Setting P107):
7-day program with same settings for all days.
7- day program with different settings for each day of the week.
One schedule for the weekdays (Monday to Friday), one for Saturday, and another for Sunday.
One schedule for the weekdays (Monday to Friday) and another for Saturday and Sunday.
Daily events
Each daily program can use 2 or 4 schedule events per day (set by Technician Setting P108).
There are two options for settings the schedule events (set by Technician Setting P109):
“EU Type” - Start time and Stop time
“US Type” - Start time, setpoint temperatures, system mode, and fan speed
Enabling/Disabling/Overriding the program
Select “00” in Technician Setting P107 to disable programming capabilities.
The occupant can temporarily change the setpoint temperature to be different than the setpoint temperature specified by the program.
Changes will be effective until the next program event begins.
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Weekly program (cont.)
Programming procedure
The detailed programming procedure is described in the next sections. Make sure to follow the right
programming procedure, suitable for the program type and features selected by Technician
Settings.
Press the [C/F - Prog] button to enter and proceed through the steps of the real time clock and
programming procedure.
Use the [+] and [-] buttons to select or change value of a flashing icon.
We recommend that you select programming values prior to the actual programming.
Exit the programming procedure
At anytime during the programming procedure, press the [On/Off] button to exit and return to normal
display - any changed values will be saved.
Adjusting the time and day of the week
The BACnet Thermostat will respond to a BACnet time sync, but you can manually set it using the
following instructions.
1. Press and hold the [C/F - Prog] button. The word “Clock” will appear on display, and
the HOURS will flash.
Hours
2. Use the [+] and [-] buttons to adjust the hours.
Minutes
3. Press the [C/F - Prog] button again. The MINUTES will flash.
4. Use the [+] and [-] buttons to adjust the hours.
Days
5. Press the [C/F - Prog] button again. The DAYS will flash.
6. Use the [+] and [-] buttons to select the day.
7. If Technician Setting P107 is not set to “00” (program is enabled), press the [C/F – Prog] button
to enter programming procedure. Make sure to follow the right programming procedure, suitable
for the program type and features selected by Technician Settings.
Section C – “EU Type”
Section D – “US Type”
Otherwise, press the [C/F - Prog] button to return to normal display.
- 14 -
Weekly program (cont.)
Adjusting “EU type” daily programs – Start time / Stop time
Start time
1. Press the [C/F – Prog] button. The programmed weekday(s), “Prog 1” indicating the
first program event of the day and the word “Start” will appear on display.
The HOURS will flash.
Note: If this is the first time a program is being set, the symbols “--“ will flash.
2. Use the [+] and [-] buttons to adjust the start time hours of the first event.
3. Press the [C/F – Prog] button again. The MINUTES will flash.
4. Use the [+] and [-] buttons to adjust the start time minutes of the first event.
Stop time
5. Press the [C/F – Prog] button again. T the word “Stop” will appear on display,
and the HOURS will flash.
6. Use the [+] and [-] buttons to adjust the stop time hours of the first event
7. Press the [C/F – Prog] button again. The MINUTES will flash
8. Use the [+] and [-] buttons to adjust the stop time minutes of the first event
Follow the steps above for the other schedule events of the same day
(Prog 2 for two events per day, or Prog 2, 3, and 4 for four events per day).
Follow the steps above for all the other days.
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Weekly program (cont.)
Adjusting “US type” daily programs – Start time / Stop time / Mode / Fan speed / Setpoints
Start time
1. Press the [C/F – Prog] button. The programmed weekday(s), “Prog 1” indicating the
first program event of the day and the word “Start” will appear on display.
The HOURS will flash.
Note: If this is the first time a program is being set, the symbols “--“ will flash.
2. Use the [+] and [-] buttons to adjust the start time hours of the first event.
3. Press the [C/F – Prog] button again. The MINUTES will flash.
4. Use the [+] and [-] buttons to adjust the start time minutes of the first event.
System mode
5. Press the [C/F – Prog] button again. The system MODES will flash.
6. Use the [+] and [-] buttons to select the system mode of the first event
7. Press the [C/F – Prog] button again. The FAN SPEEDS will flash.
8. Use the [+] and [-] buttons to select the fan speed of the first event.
Follow the steps above for setpoint temperatures.
Follow the steps above for the other schedule events of the same daily events
(Prog 2 for two events per day, or Prog 2, 3 and 4 for four events per day).
Follow the steps above for all daily periods.
- 16 -
Weekly program (cont.)
Setpoint
1. Press the [C/F – Prog] button again. The setpoint will flash.
Note: If the thermostat is configured to have two setpoints, first adjusts
the setpoint for cooling and then the setpoint for heating.
2. Use the [+] and [-] buttons to select the system mode of the first event.
Follow the steps above for the other schedule events of the same day
(Prog 2 for two events per day, or Prog 2, 3 and 4 for four events per day).
Follow the steps above for all the other days.
- 17 -
MAC Address and BACnet Device Instance Number
MAC Address
To set the communication MAC Address:
1. Adjust the setpoint temperature to 11ºC or 52ºF.
2. Press and hold the [C/F] button for 10 seconds to enter MAC Address configuration mode.
3. Use the [+] or [-] buttons to define the MAC Address (range 1...127).
4. When finished, press the [On/Off] button and readjust the setpoint.
5. Switch power supply off and on again for the MAC address changes to take effect.
Caution: Do not use the same MAC address for two devices on the same communication line!
MAC Address
1...127
BACnet Device Instance Number
By default, the BACnet Device Instance Number is generated automatically by the thermostat (Vendor ID + MAC address).
For example, Carrier’s vendor ID is 16, and if the MAC address is 075, the BACnet Device Instance Number is 16075.
Note: If you change the MAC address, you must cycle the thermostat’s power to reset the BACnet Device Instance Number.
You can override the automatically-generated BACnet Device Instance Number using the i-Vu application, an Analog Network
Output microblock in a control program, or some other BACnet utility. Write the new BACnet Device Instance Number to the
present_value property of Analog Value 42 (BACnetDeviceInstanceNumber).
Examples:
In the i-Vu application
1. Use the BACnet Discovery feature to discover the BACnet Thermostat and its BACnet objects.
2. In the navigation tree, select the Analog Value called BacnetDeviceInstanceNumber.
3. Change the Present Value field (shown below) to the desired BACnet Device Instance Number.
4. Click Accept.
In an Analog Network Output microblock
To change the BACnet Device Instance Number to 24113, the microblock’s address would be:
bacnet://16075/AV:42/present_value, or
bacnet://16075/BACnetDeviceInstanceNumber
- 18 -
Installation
Mount the BACnet Thermostat on an interior wall in the room to be controlled approximately 1.5 meters (5 feet) from the floor. Locate it
where the occupant can easily read the LCD display and use the controls, and where the built-in PIR motion sensor can easily detect
any movement in the room (see PIR detection area below). If the built-in temperature sensor is being used to measure room
temperature, place the thermostat where the temperature is representative of the general room conditions. Avoid cold or warm air drafts,
radiant heat, and direct sunlight.
Installation procedure
Prerequisite: Disconnect power to the main board before installing the unit.
A. Separate the front panel from back panel by pressing the tab located in the top of the unit and pulling the back panel off of the two
bottom tabs.
B. Do one of the following:
• If using an electrical box, mount the included wallplate to a standard 4" x 2" electrical box using the two larger mounting screws,
then mount the thermostat to the wallplate using the three smaller mounting screws. Insert the screw cap into the wallplate’s
bottom screw hole.
• If not using an electrical box, flush-mount the thermostat to the wall (no wallplate needed).
C. Make electrical connections as shown in the picture below and the wiring diagram on page 20.
Set DIP switch positions as explained in this manual.
D. Reattach the cover by placing it on the back panel’s two bottom tabs and then pushing the cover until the top tab clicks into its slot
on the cover.
PIR detection area
Horizontal
(Top view)
90°
Vertical
(Side view)
20°
1.5m / 5ft
5m / 16ft
- 19 -
Wiring terminals
For outputs 11-16, see Wiring
and DIP switch/jumper settings
(pages 25 through 39)
For T1,0 inputs:
Dry contact, 10 Vdc input, or 50 kOhm thermistor
See Technician Setting P8 (page 41).
MS/TP Communication (RS485):
BACnet
11 12 13 14 T1 0
B
(–)
Terminals
(+)
For IN1,0 inputs:
Dry contact, 10 Vdc input, or 50 kOhm thermistor
See Technician Setting P9 (page 42).
Power supply: 24 Vac
CAUTION Do not connect line
voltage to a thermostat that does
not show the following symbol:
A
0IN1 15 16 C * R *
- 20 -
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