Product Overview

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Thermostats
A-27
134 Pneumatic Low Temperature Detection Thermostat.
Description
The 134 High and Low Temperature Detection Pneumatic
Thermostats automatically “lockout” at setpoint and require
manual reset.
Features
• Snap-acting pneumatic switch
• Sight-set calibrated setpoint scale
• No leakage of air prior to reset of switch
• Easily adjustable settings
• Normally closed air valve; bleeds to less than 2 psig
(14 kPa) when supplied through a restrictor
• Barb fi tting for push-on connection of 1/4" (6 mm)
OD polyethylene tubing
• Holds dead-ended line to approximately 22 psig
(152 kPa) air pressure
Applications
The 134 Pneumatic High and Low Temperature Detection
Thermostats are used on pneumatic heating and cooling
systems in areas protected from the weather.
On a typical high limit application, the thermostat shuts
down air conditioning or ventilating fans when the duct
temperature becomes excessively high. A normally closed
switch opens at setpoint.
On a typical low temperature application, the thermostat
stops the fan or closes a damper when the temperature
drops to the setpoint at any one foot (30.5 cm) or more of
the sensing element.
Application Drawings
134
Pneumatic High and Low Temperature
Detection Thermostats