ComfortVu™ BACnet Thermostat Model Standard TB-24-HM (24 Vac)Carrier Proprietary and Confidential
CARRIER CORPORATION ©2020
Installation and Operation Guide
All rights reserved
32
Wiring and DIP switch/jumper configurations 20 to 23 – FC systems - 2-
pipe
Outputs
Config. 20:
2-Pipe, 1/2/3 Speeds
fan
(1)
Config. 21:
2-Pipe, 1/2/3 Speeds
fan
(1)
, Cool/Heat PID
Config. 22:
2-Pipe, Fan VFS
Config. 23:
2-Pipe, Fan VFS,
Cool/Heat PID
11
Fan high
Fan high
X
X
12
Fan medium
(or Economizer
(5)
)
Fan medium
(or Economizer
(5)
)
Economizer
(5)
(option – SW1.6 ON)
Economizer
(5)
(option – SW1.6 ON)
13
Fan low
Fan low
X
X
14
Heat element
(2)
(2nd stage heat)
Heat element
(2)
(2nd stage heat)
Heat element
(2)
(2nd stage heat)
Heat element
(2)
(2nd stage heat)
15
Cool/heat valve
(3)
Cool valve PID
(3)
Cool/heat valve
(3)
Cool valve PID
(3)
16
X
X
Fan VFS
Fan VFS
SW3
SW1
Jumpers
JP2, JP3
analog
outputs
(1)
SW3.1, SW3.2 = Fan speeds:
1 Speed (Low):
2 Speeds (Low and High):
3 Speeds (Low, Medium and High):
SW3.1 ON, SW3.2 OFF
SW3.1 OFF, SW3.2 ON
SW3.1 OFF, SW3.2 OFF
2)
SW3.4 = 2nd heating stage:
ON – Enable
OFF – Disable
(3)
SW3.5 = Chilled beam option:
ON – Enable chilled beam (fan will not run with cooling)
(4)
SW1.3 = Dehumidification:
ON – Use dehumidifier
OFF – Use reheat for dehumidification
(5)
SW1.6 = Terminal 12 operation:
ON – Economizer
OFF – Fan Med. (3 Speeds) / Terminal not in use (1/2 Speeds/VFS)
Important: Economizer will not work in 3 fan speeds configuration
See drawing for
DIP switch and jumper locations
(page 23).
Fan VFS, PID valves: 0-10 Vdc, 0.5 mA Not isolated
Control – Fan on/off, Heat elements, Cool/Heat valves, Economizer: 24 Vac, 0.5A max
Summary of Contents for ComfortVu TB-24-HM
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