T87N1018/U

The Round® mercury free thermostat w. manual changeover for single stage systems

Per local restrictions, item is not available for sale in the state of Colorado as of January 1, 2026

Overview

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

Hazmat Information: LITHIUM METAL BATTERIES in compliance with Section II of PI970
Application: 1 Heat/1 Cool Conventional Systems and Heat Pumps with No Auxiliary Heat
Dimensions (in.): 3 11/16 in. diameter x 1 3/4 in. deep
Dimensions (mm): 94 mm diameter x 45 mm deep
Item Type: Product
Mounting: Round
Frequency: 50 Hz; 60 Hz
Stages: 1 Heat/1 Cool
Operating Humidity Range (% RH): 5 to 90% RH (non-condensing)
Supply Voltage: 20 to 30 Vac
Switch Positions (System): HEAT-OFF-COOL
Switch Positions (Fan): AUTO-ON
Power Method: Battery assisted power stealing
Color: Premier White®
Sensor Element: Thermistor
Accuracy (F): ± 2 F
Accuracy (C): ± 1 C
Switch Type: Relay
Terminal Designations: R, Rc, W, Y, G, O, B
Changeover: Manual
Setting Temperature Range (C): 5 to 30
Cycles per Hour: Adjustable 1, 3, 5, 9
Cool Current: 0.02A to 1.0A running
Heat Current: 0.02A to 1.0A running