ComfortVu™ BACnet Thermostat Model Standard TB-HM (Line voltage)Carrier Proprietary and Confidential CARRIER CORPORATION ©2020
Installation and Operation Guide All rights reserved
34
Wiring and DIP Switch configurations 24 to 27 – FC systems - 2-pipe
Config. 24:
2-Pipe,
1/2/3 Speeds fan
(1)
,
Humidifier, Reheat for
Dehumidification
Config. 25:
2-Pipe,
1/2/3 Speeds fan
(1)
,
Cool/Heat PID,
Humidifier, Reheat for
Dehumidification
Config. 26:
2-Pipe, Fan VFS, Reheat
for Dehumidification
Config. 27
2-Pipe, Fan VFS,
Cool/Heat PID, Reheat
for Dehumidification
Fan medium
(or Economizer
(5)
)
Fan medium
(or Economizer
(5)
)
Economizer
(5)
(option – SW1.6 ON)
Economizer
(5)
(option – SW1.6 ON)
Heat element
(2nd stage heat)
Heat element
(2nd stage heat)
Heat element
(2nd stage heat)
Heat element
(2nd stage heat)
(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 Medium (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 24).
Fan on/off: 110-230VAC, 2.5A max., Fan VFS, PID valves, Hum.: 0-10VDC, 0.5mA Not isolated
Control - Heat elements, Cool/Heat valves, Economizer: 110-230VAC, 0.3A max.