Johnson Controls Direct Acting Heating Thermostat

Johnson Controls Direct Acting Day/Night Heating 12-30 Celsius 15-20 Psi. 2 Pipe Pneumatic Thermostat Vertical.
Manufactured for Canada
Note * Order cover & bracket separately
The T-4506 is a high volume dual temperature, dual dial thermostat designed to provide individual day and night or two set point temperature control. The set point change is accomplished with a change in supply pressure. A 15 PSIG supply represents the lower element and a 20 PSIG supply represents the upper element. The action of both elements is the same. A change in either set point does not affect the other set point. On day-night applications with 20 PSIG representing the night set point, an optional manual indexing switch is available to restore the day temperature of the individual thermostat without affecting the other system thermostats. The indexing switch can be unlatched manually or will automatically reset with the day cycle