Air compensation back-pressure regulator
Standard controller reset manually by turning the adjusting the stem, which increases the pressure of a spring on the top of the diaphragm. In the air compensated regulator, pressure changes at the top of the diaphragm is accomplished by injecting air pressure in a sealed casing above the diaphragm. As such, the air pressure increases positioner adjustment will be increased. This will make changes evaporator refrigerant pressure and temperature. Fluctuations of atmospheric pressure, changes in temperature thermostatic remote bulb placed in the stream environment cooled, as she leaves the evaporator. Changes in temperature of the medium being cooled over the remote bulb thermostat will cause a thermostat for the production of air pressure regulator in Bonn in the range from 0 to 15 pounds. This will cause the control knob to adjust the suction pressure evaporator in the same amount. A clearer understanding of this operation is obtained under certain conditions of labour for the purposes of illustration.
In those cases, when a greater range of modulation is required, three-to-one air relays can be installed. This will allow the 45 lb range modulation (see Fig. 10-26).
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