Honeywell T4051A, T4051B, T4051D, T6051A, T6051B Product Information Sheet
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S.H.
1-89
Form Number 63-1093
© Honeywell Inc. 1989
T4051A,B,D;
T6051A,B; T6052A,B
HEAVY-DUTY THERMOSTATS
SPECIFICATIONS
TRADELINE MODELS
TRADELINE models are selected and packaged to provide ease of stocking, ease of handling, and maximum replacement value.
TRADELINE model specifications are the same as those of standard models except as noted below.
TRADELINE MODELS AVAILABLE: SCALE RANGE: 46 to 84 F; scale marked 50, 60, 70, 80 [8 to
T6051A, T6052A,B Heavy Duty Thermostats. 29 C; scale marked 10, 15, 20, 25].
MOUNTING: Mount either vertically or horizontally on a standard ADDITIONAL FEATURES:
outlet box. T6051A, T6052B can be mounted on a Q651 Subbase • Extra cover plate for horizontal mounting.
(see Accessories) to provide manual switching at thermostat. • T6051A may be used in electric heat systems
RESISTIVE CURRENT (ELECTRIC HEAT APPLICATIONS) (without Q651 Subbase).
FOR T6051A (without Q651): 22 amp at 120/240 Vac; 19 amp • TRADELINE pack with cross-reference label and special
at 277 Vac. instruction sheet.
STANDARD MODELS
MODELS:
T4051A Heavy Duty Thermostat—heating only.
T4051B Heavy Duty Thermostat—cooling only.
T4051D Heavy Duty Thermostat—electric heating only.
T6051A Heavy Duty Thermostat—heating only, cooling only, or
heating/cooling (external changeover switch required).
T6051B Explosion-proof, Heavy Duty Thermostat—heating only,
cooling only, or heating/cooling (external changeover switch
required).
T6052A Heavy Duty Thermostat—two-stage heating or cooling.
T6052B Heavy Duty Thermostat—heating/cooling with automatic
changeover.
UNDERWRITERS LABORATORIES INC. LISTED:
T4051A (with or without Q561A,B), T4051B,D; T6051A (with or
without Q651A,B,C), T6052A, T6052B (with or without
Q651C)—File No. E4436, Guide No. XAPX.
T6051B—File No. E12842, Guide No. XBDV.
Explosion-proof Enclosure—Class I, Groups C and D and
Class 2, Groups E, F, and G.
CANADIAN STANDARDS ASSOCIATION CERTIFIED:
T4051A,B,D; T6051A; T6052A,B—File No. LR1620.
T6051B—File No. LR30676-L.
ELECTRICAL RATINGS (amperes):
Voltage and Frequency—120/240 Vac, 50/60 Hz. (T4051B— 120
or 240 Vac, 50/60 Hz.).
THE T4051, T6051, AND T6052 ARE HEAVY-DUTY, LINE
VOLTAGE THERMOSTATS USED TO CONTROL FAN COILS,
FANS, MOTOR STARTERS, VALVES, CONTACTORS, AND
CIRCULATOR MOTORS IN HEATING AND/OR COOLING
SYSTEMS.
❑ T4051A ❑ T6051A ❑ T6052A
❑ T4051B ❑ T6051B ❑ T6052B
❑ T4051D
• T4051A is for heating control.
• T4051B is for cooling control.
• T4051D is for electric heat applications.
• T6051A and B may be used in heating systems, cooling
systems, combination heat-cool systems (changeover must
be provided), or as a series 60 controller for valves and
motors.
• T6051B has special explosion-proof housing.
• T6052A is for two-stage heating or two-stage cooling sys-
tems.
• T6052B is for one-stage heating-cooling systems with automatic changeover.
• Q651 Subbases are available to provide system and fan
switching from the thermostat location.
• A locking cover is standard on all models.
• The set point knob locks in the desired setting and may be
removed to prevent tampering.
• TRADELINE models maybe vertically or horizontally
mounted.
IMPORTANT
THE SPECIFICATIONS GIVEN IN THIS PUBLICATION DO NOT INCLUDE NORMAL MANUFACTURING TOLERANCES. THEREFORE, THIS UNIT MAY NOT MATCH THE LISTED SPECIFICATIONS EXACTLY. ALSO, THIS PRODUCT IS TESTED AND CALIBRATED UNDER CLOSELY CONTROLLED CONDITIONS, AND SOME MINOR DIFFERENCES IN PERFORMANCE CAN BE EXPECTED
IF THOSE CONDITIONS ARE CHANGED.
T6051
T4051
All models except T6051B—
120 Vac 240 Vac
AC AC
T4051A,B,D
a
T6051A (heat) Full Load 16.0 8.0
T6052A (N.C. contacts)
T6052B (auto changeover Locked Rotor 96.0 48.0
heat and cool
T6051A (cool) Full Load 8.0 4.0
T6052A (N.O. contacts) Locked Rotor 48.0 24.0
120 Vac 240 Vac
AC AC
Heating Full Load 10.2 6.5
Locked Rotor 61.2 39.0
Cooling Full Load 7.4 4.0
Locked Rotor 44.4 24.0
a
T4051D also has resistive rating—22 amp at 120/240 Vac; 19
amp at 277 Vac.
Pilot Duty Rating (all models)—125 VA.
DIFFERENTIAL:
T4051, T6051—1 F [0.6 C].
T6052A—
–stage 1 heat, stage 2 cool—2.5 F [1.4 C] (nominal).
–stage 2 heat, stage 1 cool—3.2 F [1.8 C] (nominal).
T6052B—
–stage 1 heat—2.5 F [1.4 C] (nominal).
–stage 2 heat—3.2 F [1.8 C] (nominal).
SWITCHING:Snap-acting switch makes on temperature fall for
heating and on temperature rise for cooling. On T6052A, two
switches make in sequence for two-stage heating or cooling. On
T6052B, two switches make in sequence for auto changeover.
SCALE RANGE:
Fahrenheit—46 to 84 F; scale marked 50, 60, 70, 80.
Celsius—8 to 29 C; scale marked 10, 15, 20, 25.
MOUNTING: All models except T6051B mount directly on standard
outlet box. T6051B cast housing serves as outlet box.
COVER: Molded cover.
DIMENSIONS, IN INCHES [MILLIMETERS IN BRACKETS]: All
models except T6051B—5 [127] high, 3-1/8 [79.4] wide, 1-5/8
[41.3] deep. Switches and wiring terminals protrude into outlet
box 7/8 inch [22.2 mm]. T6051B—see Fig.1.
OPTIONAL SPECIFICATIONS:
1. T6051A with WARMER-COOLER scale; moisture fungus
treated.
2. T6051A, 46 to 84 Fahrenheit scale, for horizontal mounting.
3. T6051A with Celsius scale. Mounts either horizontally or
vertically.
4. T6052A with Celsius scale. Mounts either horizontally or
vertically.
5. T6052B with Celsius scale. Mounts either horizontally or
vertically.
6. T4051, T6051A, or T6052 with metal cover.
7. T4051, T6051A, or T6052 without thermometer.
Fig. 1—DIMENSIONS IN INCHES [mm IN BRACKETS]
PRINTED IN U.S.A.
T6051B Only—
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