When setting the relay characteristic/torque angle for the three phase directional overcurrent element, a positive angle setting was specified. This was due to the fact that we consider as polarising voltage, the phase voltage value in quadrature of the current under fault conditions. With directional earth fault protection, the residual current under fault conditions lies at an angle lagging the polarising residual earth fault voltage.
Application
The TC-5231, TC-5232, and TC-5241 low temperature
thermostats are used to control temperature in air
conditioning or refrigeration systems. The low
temperature thermostat measures the coldest one-foot
section along the entire 20-foot sensing element.
The low temperature thermostats are applicable to
various applications such as: low temperature control
of steam coils; frost indication in storehouses or
orchards; temperature control of freezer cabinets,
display cases, beverage coolers, milk cooling tanks,
and air conditioners.
Features
• 20 ft. (6.1 m) element senses temperature over a
large area. Control responds to coldest one-foot
section of the sensor.
• Adjustable setpoint from 35 to 60°F (1.7 to 15.5°C)
with 5°F (3°C) fixed differential.
• SPDT and DPST versions.
• Rated for use at 17 full load amps (120/208/240
Vac), 24 non-inductive amps (120/208/240 Vac),
and 16 non-inductive amps (24 Vac). Capable of
controlling refrigeration equipment directly.
• UL and CSA approved.
• Capillary clips provided.
Applicable Literature
• Electric/Electronic Products Catalog, F-27382
• Environmental Controls Application Manual,
F-21335
