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The unit gas controls shall be provided with the following: <br /> Two-stage gas controls with a two-stage combination gas control, an ignition control, and a two- <br /> stage low voltage thermostat. The unit fires at 50% fire on low stage or 100% fire on high stage of <br /> the unit based on the call for heat from a room thermostat. <br /> An automatic reset high limit switch mounted in the air stream to shut off the gas supply in the <br /> event of overheating. <br /> A time delay relay that delays the start of the air mover to allow the heat exchanger a warm-up <br /> period after a call for heat. The time delay relay shall also continue the air mover operation after <br /> the thermostat has been satisfied to remove any residual heat in the heat exchanger. <br /> The unit must be field adjusted for 0-2000 feet elevation above sea level. See units installation <br /> manual for instruction for altitude adjustments. <br /> Electrical <br /> All electrical components shall carry UL, ETL, or CSA certification. <br /> A low voltage terminal board shall be provided for direct wiring connection to an external <br /> thermostat. <br /> A single 115V to 24V step down transformer shall be provided for all unit controls. <br /> Air Mover <br /> The motor horsepower shall be 3/4 H.P. <br /> The motor wiring shall be in flexible metal BX conduit. <br /> The motor shall be controlled by a time delay relay. <br /> Propeller models shall meet the following requirements: <br /> The motor type shall be Single-Speed, Totally Enclosed (TE). <br /> The air mover motor shall be a 115V motor. <br /> Mounting <br /> The unit shall be equipped with tapped holes to accept 3/8"-16 threaded rod for suspension. <br /> Unit to have 4 suspension points. <br /> Accessories <br /> The following field installed accessory control devices shall be provided with the unit: <br />