Honeywell T678C, T678E, T678F Catalog Page
Temperature Controllers
T678C,E,F Changeover Temperature Controller
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
Dimensions in inches (millimeters) Type: Remote bu b
Application: Changeover temperature control
Sensor Element: Copper bulb
15/16
(24)
KNOCKOUT FOR
1/2 CONDUIT (BOTH ENDS)
1
Contact Ratings (120 Vac): 8.0 AFL, 48.0 ALR
Contact Ratings (240 Vac): 5.1 AFL, 30.6 ALR
Voltag e: 120 Vac or 240 Vac
Frequency: 50 Hz; 60 Hz
Number of Sensor Inputs: 1
2 SPDT switch contacts
T678C, T678F: 8.0 AFL, 48.0 ALR
T678E: Control: 2.6 AFL, 15.6 ALR; Hi Limit: 7.4 AFL, 44.4 ALR
2 (51)
3/8 (10)
2-1/4 (57)
2-1/8 (54)
Output:
Output Type: Relay
Contact Ratings (120 Vac):
Contact Ratings (240 Vac):
T678C, T678F: 5.1 AFL, 30.6 ALR
T678E: Control: 1.3 AFL, 7.8 ALR; Hi Limit: 5.1 AFL, 30.6 ALR
4-3/16
(106)
15/16
(24)
3/8
(10)
60
1-7/32
(31)
70
80
5-5/8
(143)
M13907
Maximum
Operating
Temperature
Setpoint
Temperature
Range
Differential
Temperature Bulb Size
Product Number
T678C1005/U 205 F 96 C 55 F to
85 F
T678E1003/U 210 F 99 C 40 F to
180 F
T678F1002/U 130 F 54 C 55 F to
85 F
352 customer.honeywell.com 70-6910
13 C to
29 C
4 C to
82 C
13 C to
29 C
5 F 2.8 C 3/8 in. x
3 in.
2 F 1.1 C 1/8 in. x
42 in.
2 F 1.1 C 5/16 in. x 11
11/16 in.
10 mm x
76 mm
3 mm x
1064 m
8 mm x
297 mm
Capillary
Length
Interstage
Differential
Temperature
Comments(F) (C) (F) (C) (F) (C) (inch) (mm) (ft) (m) (F) (C)
5 1/2 ft 1.7 m — — —
17 ft 5.2 m 7 F 3.9 C Does not include
enclosure
5 1/2 ft 1.7 m — — —
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