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Fan-powered condensers shall conform to the following requirements:
  1. Design saturated condensing temperatures for air-cooled condensers shall be less than or equal to the design dry-bulb temperature plus 10°F for low-temperature refrigeration systems and less than or equal to the design dry-bulb temperature plus 15°F for medium-temperature refrigeration systems.
    1. Saturated condensing temperature for blend refrigerants shall be determined using the average of liquid and vapor temperatures as converted from the condenser drain pressure.
  2. Condenser fan motors that are less than 1 hp shall use electronically commutated motors, permanent split-capacitor-type motors, or three-phase motors.
  3. All condenser fans for air-cooled condensers, evaporatively cooled condensers, and air- or water-cooled fluid coolers or cooling towers shall incorporate one of the following continuous variable-speed fan control approaches and shall reduce fan motor demand to no more than 30% of design wattage at 50% of design air volume:
    1. Refrigeration system condenser control for air-cooled condensers shall use variable set-point control logic to reset the condensing temperature set point in response to ambient dry-bulb temperature.
    2. Refrigeration system condenser control for evaporatively cooled condensers shall use variable set-point control logic to reset the condensing temperature set point in response to ambient wet-bulb temperature.
  4. Multiple fan condensers shall be controlled in unison.
  5. The minimum condensing temperature set point shall be no greater than 70°F.

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