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Honeywell T675A,B, T678A Remote Bulb Controllers

Remote Bulb Controllers
T675A,B, T678A

Remote bulb thermostats regulate temperature of air or liquids in ducts, pipes, tanks and boilers.

• Suitable for applications requiring temperature control of air or liquids where controller must be placed outside the sensing area. 
• Typical uses include control of dampers and valves in heating, cooling and heating-cooling systems. 
• Fast response models (available for use in return air duct) operate approximately four times faster than standard models. 
• Controller can be mounted in any position. Ambient temperature compensation provides good temperature control. 
• Refer to T775 Electronic Remote Temperature Controller where more exact control is required and/or remote controller location is preferred. 
• T678 models have a maximum connected load of 2000 VA.

Select a link under the "item" tab below to order.

Cat #CommentsIncludesOutputSetpoint Temperature RangeSensor ElementDifferential TempBulb SizeCapillary LengthMaximum Operating TemperatureInterstage Differential Temperature
T675A10451 SPDT0 F to 100 FStainless steel bulb3 F to 10 F1/2 in. x 4 3/16 in.20 ft.125 F
T675A11021 SPDT160 F to 260 FCopper bulb3 F to 10 F1/2 in. x 4 3/16 in.20 ft.280 F
T675A11361 SPDT0 F to 100 FCopper bulb1 F fixed1/2 in. x 4 3/16 in.20 ft.125 F
T675A1243Celsius model1 SPDT167 F to 257 FCopper bulb3 F to 10 F1/2 in. x 4 3/16 in.5 ft125 F
T675A14251 SPDT55 F to 175 FCopper bulb3.6 F to 12 F1/2 in. x 3 9/16 in.20 ft.200 F
T675A14581 SPDT55 F to 175 FCopper bulb1 F fixed1/2 in. x 3 9/16 in.5 ft200 F
T675A1508107324A Duct Bulb holder1 SPDT0 F to 100 FCopper bulb1 F fixed1/2 in. x 4 3/16 in.5 ft125 F
T675A1516107324A Duct Bulb holder1 SPDT0 F to 100 FCopper bulb1 F fixed1/2 in. x 4 3/16 in.5 ft125 F
T675A15241 SPDT55 F to 175 FCopper bulb1 F fixed1/2 in. x 3 9/16 in.20 ft.200 F
T675A1532107324A Duct Bulb holder1 SPDT160 F to 260 FCopper bulb3 F to 10 F1/2 in. x 4 3/16 in.5 ft280 F
T675A1540107324A Duct Bulb holder1 SPDT55 F to 175 FCopper bulb3.6 F to 12 F1/2 in. x 3 9/16 in.5 ft200 F
T675A1565107324A Duct Bulb holder1 SPDT0 F to 100 FCopper bulb3 F to 10 F1/2 in. x 4 3/16 in.20 ft.125 F
T675A1706Fast response model131524A duct bulb holder1 SPDT0 F to 100 FFast response capillary3 F to 10 Fcoil 1 1/2 in. diameter x 5 in.5 ft125 F
T675A1771Fast response model131524A duct bulb holder1 SPDT55 F to 175 FFast response capillary1 F fixedcoil 1 1/2 in. diameter x 5 in.5 ft200 F
T675B10021 SPDT30 F to 50 FCopper bulbManual Reset1/2 in. x 4 3/16 in.10 ft125 F
T675B10101 SPDT30 F to 50 FCopper bulbManual Reset1/2 in. x 4 3/16 in.20 ft.125 F
T675B10281 SPDT-20 F to +50 FCopper bulbManual Reset1/2 in. x 4 3/16 in.10 ft125 F
T678A1015maximum connected load = 2000VA2 SPDT switch contacts0 F to 100 FCopper bulb3 F fixed1/2 in. x 4 3/16 in.20 ft.125 F3 F to 10 F adj.
T678A1163maximum connected load = 2000VA; Celsius model2 SPDT switch contacts5 F to 95 FCopper bulb3 F fixed1/2 in. x 4 3/16 in.20 ft.125 F3 F to 10 F adj.
T678A1361maximum connected load = 2000VA2 SPDT switch contacts55 F to 175 FCopper bulb3.6 F fixed1/2 in. x 3 9/16 in.20 ft.200 F3.6 F to 12 F adj.
T678A1437maximum connected load = 2000VA; Celsius model2 SPDT switch contacts0 F to 100 FCopper bulb3 F fixed1/2 in. x 4 3/16 in.5 ft125 F3 F to 10 F adj.
T678A1445maximum connected load = 2000VA; Celsius model2 SPDT switch contacts55 F to 175 FCopper bulb3 F fixed1/2 in. x 3 9/16 in.5 ft200 F3.6 F to 12 F adj.
T678A1478maximum connected load = 2000VA; Fast response model2 SPDT switch contacts0 F to 100 FFast response capillary3 F fixed1/2 in. x 4 3/16 in.5 ft125 F3 F to 10 F adj.
T678A1494maximum connected load = 2000VA; Fast response model2 SPDT switch contacts55 F to 175 FFast response capillary3.6 F fixed1/2 in. x 3 9/16 in.5 ft200 F3.6 F to 12 F adj.
T678A1627maximum connected load = 2000VA2 SPDT switch contacts0 F to 100 FAveraging capillary3.6 F fixed1/2 in. x 4 3/16 in.10 ft125 F3.6 F to 12 F adj.
T678A1692maximum connected load = 2000VA; Celsius model2 SPDT switch contactsCopper bulb3.6 F1/2 in. x 4 in.5 ft200 F3.6 F
Type: Remote bulb
Application: Regulates temperature of air or liquids in ducts, pipes,
tanks and boilers
Number of Sensor Inputs: 1
Voltage: 120 Vac or 240/277 Vac
Frequency: 50 Hz; 60 Hz
Output Type: relay
Approvals:
Canadian Standards Association: CSA Listed: Report -1
Underwriters Laboratories Inc. UL Listed: E4436, Vol. 4, Sec. 11,
Guide XAPX

 

 

 

 

 

 

 

 

 

 

 

 



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