Honeywell T8775A, T8775C, T87K, T87N Catalog Page

Non-Programmable Thermostats

T8775A,C The Digital Round® Non-Programmable Thermostats

The Digital Round® Thermostats provide 24V control of heating
only or heat/cool systems.

• Attractive styling complements any decor

• One-touch backlit display

• Familiar twist-to-see operation

• Available in Heat/Cool and Heat Only models

Dimensions, Approximate: 3 11/16 in. diameter x 1 7/16 in. deep

(94 mm diameter x 37 mm deep)

Display Size: 0.75 sq in.
Operating Humidity Range (% RH): 5 to 90% RH (non-condensing)
Accuracy: ±1 F (±0.5 C)
Cycles per Hour: Adjustable 1, 3, 6, 9
Switch Type:

Electronic

Cooling: 0.02A to 1.5A running; 6.0A inrush
Heating: 0.02A to 1.5A running, 3.5A inrush
Fan: 0.02A to 0.5A running, 2.5A inrush
Electrical Ratings: 18 to 30 Vac
Frequency: 60 Hz

Sensor Element: Thermistor
Color: Premier White®
Mounting: Round
Comments: Large easy-to-see backlit display
Includes: Wallplate, resistor assembly, mounting screws and wall

anchors

Accessories:

50000066-001-Decorative Cover Plate for T8775 or T87K,N

Replacement Parts:

50034437-001-T8775 Resistor/Transorb Bag Assembly

Powe r Method: Powered through system heating controls

Switch Positions

Product Number Application

T8775A1009/U Heat Only — — R, W 1 Heat 40 to 90 4.5 to 32

T8775C1005/U 1 Heat/1 Cool Conventional Systems

T87K,N The Round

and Heat Pumps with No Auxiliary Heat

®

System Fan (F) (C)

HEAT-OFF­COOL

AUTO-ON R, Rc, W, Y,

Termi nal
Designations Stages

G, O, B

1 Heat/1 Cool 40 to 90 in heat;

Temperature Setting Range

45 to 99 in cool

4.5 to 32 in heat;
7 to 37 in cool

Operating Humidity Range (% RH): 5 to 90% RH (non-condensing)
Accuracy: ±1 F (± 0.5 C)
Cycles per Hour: Adjustable 1, 3, 5, 9
Switch Type:

Relay

Heating: 0.02 A to 1.0 A running
Electrical Ratings: 20 to 30 Vac
Frequency: 50 Hz; 60 Hz
Power Method: Battery assisted power stealing
Sensor Element: Thermistor
Color: Premier White®

The Round® thermostats provide electronic control of 24Vac
heating and cooling systems with the classic twist to set dial.

• Mercury Free

• Classic Styling

Mounting: Round

Accessories:

50000066-001-Decorative Cover Plate for T8775 or T87K,N
50010944-001-Range Stop Assembly

• Premier White®

• The T87K heat only works with 2 or 3 wire heat-only systems

Switch
Positions

Product Number Application

T87K1007/U Heat Only — — R, W, Y 1 Heat 40 to 90 3 11/16 in.

T87N1000/U 1 Heat/1 Cool

T87N1026/U 1 Heat/1 Cool

28 customer.honeywell.com 70-6910

Conventional
Systems and Heat
Pumps with No
Auxiliary Heat

Conventional
Systems and Heat
Pumps with No
Auxiliary Heat

HEAT­OFF­COOL

HEAT­OFF­COOL

Ter min al
Designa­tions Stages

AUTO-ONR, Rc, W,

Y, G, O, B

AUTO-ONR, Rc, W,

Y, G, O, B

1 Heat/
1 Cool

1 Heat/
1 Cool

Temperature
Setting
Range

40 to 90 3 11/16 in.

40 to 90 4 in.

Dimensions,
Approximate

diameter x 1
3/4 in. deep

diameter x 1
3/4 in. deep

diameter x 1
3/4 in. deep

94 mm
diameter x
45 mm deep

94 mm
diameter x
45 mm deep

102 mm
diameter x
45 mm deep

Comments IncludesSystem Fan (F) (inch) (mm)

——

——

EASY-TO-SEE
model with Large
raised markings
and a click at
each 2 degree
setpoint change

6 in.
(152 mm)
cover ring
and switch
position
labels