Product Overview

www.pro1iaq.com
1-800-PRO1-559 (776-1559)
R251S
R250S
Remote Sensing Options for the T855SH Thermostat
The T855SH can be congured in one of three ways with wired remote sensors to achieve maximum
comfort in a space. These accessories are just another way PRO1 has improved comfort and eciency
at a low cost to home and building owners.
Outdoor Remote Sensing
Slab Sensing
Indoor Remote Sensing
The R251S provides a better level of comfort by averaging
as many as 16 dierent sensing points. Additional indoor
sensors increase the accuracy of the temperature reading
throughout 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 radiant
heating 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.