Installation Instructions T25
Issue Date 05/27/14
T25 Two-Stage Room Thermostat
Application Requirements
T25 thermostats are for line- or low-voltage service
requiring accurate control of two operating functions.
There are two stages of control for heating and
cooling with automatic changeover on three- and
four-pipe fan coil installations and similar
applications. Typical uses are for compressor
controls, relays, valves, fan coils, and other
applications where low differentials and accurate
sensing are required.
Installation
IMPORTANT: Use this T25 Two-Stage Room
Thermostat only as an operating control. Where
failure or malfunction of the thermostat could lead to
personal injury or property damage to the controlled
equipment or other property, additional precautions
must be designed into the control system.
Incorporate and maintain other devices, such as
supervisory or alarm systems or safety or limit
controls, intended to warn of or protect against
failure or malfunction of the thermostat.
IMPORTANT : Utiliser ce T25 Two-Stage Room
Thermostat uniquement en tant que dispositif de
contrôle de fonctionnement. Lorsqu'une
défaillance ou un dysfonctionnement du thermostat
risque de provoquer des blessures ou
d'endommager l'équipement contrôlé ou un autre
équipement, la conception du système de contrôle
doit intégrer des dispositifs de protection
supplémentaires. Veiller dans ce cas à intégrer de
façon permanente d'autres dispositifs, tels que des
systèmes de supervision ou d'alarme, ou des
dispositifs de sécurité ou de limitation, ayant une
fonction d'avertissement ou de protection en cas
de défaillance ou de dysfonctionnement du
thermostat.
Parts Included
• 1 thermostat
• 1 Allen wrench
• 2 machine screws
Dimensions
Refer to Figure 1 for detailed dimensions of the
T25 Two-Stage room Thermostat.
Mounting
Location Considerations
Mount the thermostat about 4 to 5 ft. (1.2 to 1.5 m)
above the floor on an interior wall, where it can sense
the average room temperature. It is designed for vertical
mounting and will produce the lowest operating
differentials when installed in this position.
Do not mount the thermostat where it may react to heat
or cold from water pipes, windows, doors, lamps,
sunlight, or other heat or cold sources.
On unit heater applications, place the thermostat below
and behind the heater in the path of air entering the unit,
not in the path of discharge air.
© 2014 Johnson Controls, Inc. 1
Part No. 24-9716-5, Rev. B www.johnsoncontrols.com
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