T855SH

www.pro1iaq.com1-800-PRO1-559 (776-1559)

LIGHT COMMERCIAL/RESIDENTIAL WIRED REMOTE SENSING THERMOSTAT WITH HUMIDITY CONTROL

T855SH 5*

Rev. 1912

• Advanced pre-occupancy purge and IAQ fan control

• Set dual-fuel balance point with outdoor temperature sensor (R250S)

• Remote sensor compatable (R251S) for moving sensing location or temperature averaging

• Humidity and dehumidity control

• Two and four occupancy/unoccupancy time periods available

• Partial and full keypad lockout

• Large display

• Adjustable setpoint limits

• Ventialtion and economizer control

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5/1/1 Programmable

Non-Programmable

7 Day Programmable

3 8 5

Terminals

Wired accessories available for T855SH. R251S is an indoor remote temperature sensor. R250S is an outdoor remote temperature sensor.* 2 heat stages for conventional heat

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www.pro1iaq.com 1-800-PRO1-559 (776-1559)

R251S

R250S

Remote Sensing Options for the T855SH ThermostatThe T855SH can be con�gured in one of three ways with wired remote sensors to achieve maximumcomfort in a space. These accessories are just another way PRO1 has improved comfort and e�ciencyat a low cost to home and building owners.

Outdoor Remote Sensing

Slab Sensing

Indoor Remote SensingThe R251S provides a better level of comfort by averagingas many as 16 di�erent sensing points. Additional indoorsensors increase the accuracy of the temperature readingthroughout a space and allow the thermostat to be located in a tamper proof location.

The R250S can also be used as a �oor sensor in radiantheating applications. By sensing the temperature at the heat source, this accessory greatly improves the comfort of the space and the e�ciency of the heating system.

The R250S can also be used as an outdoor temperature sensor to set a dual-fuel balance point. This feature chooses the most e�cient heat source based on the outside temperature. At this predetermined point the system will automatically choose the best heating source to save energy.