Johnson Controls T-4506-217 Reverse Acting Dual Temperature Pneumatic Thermostat 55-85°F

The Johnson Controls T-4506-217 is a horizontal-mounted, reverse acting pneumatic thermostat designed for HVAC temperature control applications. This high volume output thermostat features dual temperature controls with dual dials, operating in a temperature range of 55-85°F with switchover occurring at 17 psi.

Key Features:

• Dual temperature, dual dial design for individual day/night or two set point temperature control
• Reverse acting configuration for heating and cooling applications
• Horizontal mounting orientation
• High volume pneumatic output for modulating valves and damper actuators
• Temperature range: 55-85°F
• Supply pressure changeover: 15 psi (lower element) and 20 psi (upper element)
• Model T-4506-217 does not include indexing switch
• Independent set point adjustment - changes to one set point do not affect the other

This pneumatic thermostat produces a proportional output signal that modulates pneumatic valves and damper actuators in response to space temperature load changes. The set point change is accomplished through supply pressure variation, making it ideal for building automation systems requiring precise temperature control without the need for electrical connections.