TP972A2028 Honeywell Thermostat

Datasheet

MOD KIT.2-PIPE,60-90F,HTG/CLNG

In force-balance design, two forces oppose each other until they are equal, or balanced. The TP970 and TP9600 Series Thermostats use the force of the bimetal to close the flapper over the nozzle and the opposing force of the air pressure in the nozzle chamber to lift the flapper (see the FlapperNozzle Operation section). When the forces are equal, a force-balance condition exists.

The throttling range setting and the calibration reference temperature determine the Thermostat span and calibration point. At control point the nozzle-flapper-bimetal assembly (acting through the calibration screw, setpoint cam, and the throttling range (TR) adjustment) has a fixed branchline pressure (BLP) for each temperature within the temperature and throttling range settings. The forces within the nozzleflapper-bimetal assembly always seek a balanced condition; giving the same BLP for the same temperature regardless of fluctuations in main air or the relative positions of the nozzle, flapper, and bimetal.