Johnson Controls A28AA-4 Temperature Control R-410A making them suitable for low

making them suitable for low to medium pressure steam and hot water applications within those specific technical limits

5-inch dial for precise viewing of PSI and Fahrenheit levels

This valve rebuild kit is rated for systems up to 300 psi and is the standard choice for 2-way and 3-way zone valve maintenance where the physical valve body remains structurally sound but the internal seat has failed

Avoid mounting the valve upside down

Johnson Controls A28AA-4 Temperature Control R-410A making them suitable for lowThe Johnson Controls A28AA 4 is a heavy duty two stage temperature control designed for versatile HVAC applications requiring sequenced switching. This electro mechanical thermostat features dual SPDT switch action, allowing for precise control over two separate circuits based on temperature fluctuations. With a wide 30 to 110 degree setpoint range and a multi voltage capacity of 120 208 240 277 Vac, it is a standard component for commercial cooling