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0 TRWE" <br /> Mechanical Specifications <br /> Thermal Expansion Valve <br /> Thermal Expansion Valve is standard for all models. <br /> Through-the-Base Electrical Access <br /> An electrical service entrance shall be provided allowing electrical access for both control and main <br /> power connections inside the curb and through-the-base of the unit. Option will allow for field <br /> installation of liquid-tight conduit and an external field-installed disconnect switch. <br /> Through-the-Base Electrical with Circuit Breaker <br /> This option is a thermal magnetic,molded case,HACK Circuit Breaker with provisions for through- <br /> the-base electrical connections.The circuit breakerwill be installed in a watertight enclosure in the <br /> unit with access through a swinging door.Wiring will be provided from the switch to the unit high <br /> voltage terminal block.The circuit breakerwill provide overcurrent protection,be sized per NEC and <br /> cULus guidelines, and be agency recognized by cULus. <br /> Through-the-Base Electrical with Disconnect Switch <br /> This 3-pole, molded case,disconnect switch with provisions for through-the-base electrical <br /> connections are available.The disconnect switch will be installed in the unit in a watertight <br /> enclosure with access through a swinging door.Wiring will be provided from the switch to the unit <br /> high voltage terminal block.The switch will be cULus agency recognized. <br /> Note:The disconnect switch will be sized per NEC and cULus guidelines but will not be used in <br /> place of unit overcurrent protection. <br /> Two-Inch Filters <br /> Two-inch MERV 8 and MERV 13 media filters shall be available on all models.When ordered,units <br /> come equipped with a filter removal tool. <br /> Factory or Field Installed Options <br /> Clogged Filter/Fan Failure Switch <br /> A dedicated differential pressure switch is available to achieve active fan failure indication and/or <br /> clogged filter indication.These indications will be registered with a zone sensor with status <br /> indication Iights.This option is available for microprocessor controlled units. <br /> Differential Pressure Switches <br /> These sensors allow individual fan failure and dirty filter indication for microprocessor controlled <br /> units.The fan failure switch will disable all unit functions and"flash"the Service LED on the zone <br /> sensor.The dirty filter switch will light the Service LED on the zone sensor and will allow continued <br /> unit operation. <br /> Discharge AirTemperature Sensing <br /> This option provides true discharge air temperature sensing in heating models.This option is <br /> available for microprocessor controlled units. <br /> Economizer (Standard) <br /> This accessory shall be available with or without barometric relief.The assembly includes fully <br /> modulating 0-100 percent motor and dampers, minimum position setting, preset linkage,wiring <br /> harness with plug, spring return actuator and fixed dry bulb control.The barometric relief shall <br /> provide a pressure operated damper that shall be gravity closing and shall prohibit entrance of <br /> outside air during the equipment"off' cycle. Optional solid state or differential enthalpy control <br /> shall be available for either factory or field installation.The economizer arrives in the shipping <br /> position and shall be moved to the operating position by the installing contractor. <br /> PKGP-PRC013K-EN 83 <br />