840 N BROADWAY 2017-08-21 - Laserfiche WebLink

3. Anti sweat heater controls shall reduce the energy C410.3.2 Compressor systems.Refrigeration use of the antisweat heater as a function of the compressor systems shall comply with the following: relative humidity in the air outside the door or to 1. Compressors and multiple-compressor system the condensation on the inner glass pane. suction groups shall include control systems that C410.3 Refrigeration systems.Refrigerated display use floating suction pressure control logic to cases,walk-in coolers or walk-in freezers that are served reset the target suction pressure temperature by remote compressor and remote condensers not located based on the temperature requirements of the in a condensing unit,shall comply with Sections C410.4.1 attached refrigeration display cases or walk-ins. and C410.4.2. Exception:Controls are not required for the Exception: Systems where the working fluid in the following: refrigeration cycle goes through both subcritical and 1. Single-compressor systems that do not supercritical states(transcritical)or that use ammonia have variable capacity capability. refrigerant are exempt. 2. Suction groups that have a design saturated suction temperature of 30°F C410.3.1 Condensers serving refrigeration systems. (-1.1°C)or higher,suction groups that Fan-powered condensers shall comply with the comprise the high stage of a two-stage or following: cascade system,or suction groups that 1. The design saturated condensing temperatures primarily serve chillers for secondary for air-cooled condensers shall not exceed the cooling fluids. design dry-bulb temperature plus 10°F(5.6°C) 2. Liquid subcooling shall be provided for all for low-temperature refrigeration systems,and low-temperature compressor systems with a the design dry-bulb temperature plus 15°F(8°C) design cooling capacity equal to or greater than for medium temperature refrigeration systems 100,000 Btu/hr(29.3 kW)with a where the saturated condensing temperature for design-saturated suction temperature of-10°F blend refrigerants shall be determined using the (-23°C)or lower.The subcooled liquid average of liquid and vapor temperatures as temperature shall be controlled at a maximum converted from the condenser drain pressure. temperature setpoint of 50°F(10°C)at the exit of 2. Condenser fan motors that are less than 1 hp the subcooler using either compressor (0.75 kW)shall use electronically commutated economizer(interstage)ports or a separate motors,permanent split-capacitor-type motors or compressor suction group operating at a 3-phase motors. saturated suction temperature of 18°F(-7.8°C)or 3. Condenser fans for air-cooled condensers, higher. evaporatively cooled condensers,air-or 2.1. Insulation for liquid lines with a fluid water-cooled fluid coolers or cooling towers operating temperature less than 60°F shall reduce fan motor demand to not more than (15.6°C)shall comply with Table 30 percent of design wattage at 50 percent of C403.2.10. design air volume,and incorporate one of the 3. Compressors that incorporate internal or external following continuous variable speed fan control crankcase heaters shall provide a means to cycle approaches: the heaters off during compressor operation. 3.1. Refrigeration system condenser control for air-cooled condensers shall use variable setpoint control logic to reset the condensing temperature setpoint in response to ambient dry-bulb temperature. 3.2. Refrigeration system condenser control for evaporatively cooled condensers shall use variable setpoint control logic to reset the condensing temperature setpoint in response to ambient wet-bulb temperature. 4. Multiple fan condensers shall be controlled in unison. 5. The minimum condensing temperature setpoint shall be not greater than 70°F(21°C). CE-118 2015 Washington State Energy Code