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Included Options <br /> AA1: Unit equipped for natural gas <br /> Natural gas is a naturally occurring gas mixture consisting primarily of methane and includes varying <br /> volumes of alkanes, carbon dioxide, nitrogen, and hydrogen sulfide. <br /> 1 Therm = 100,000 BTU = 29.3 kWh <br /> AC2: Heat exchanger is manufactured from die-formed halves of 409 (E-3) Stainless Steel. Design for <br /> improved corrosion resistance over standard heat exchanger material. <br /> AD2: Units supplied with steel die-formed atmospheric burners constructed with 409 E-3 stainless steel <br /> ribbon inserts. Burners are designed with a die-formed flared venturi inlet ports. Units provided with <br /> 409 E-3 stainless steel burner body construction. <br /> AF2: Burner drip pan and unit bottom panel of 409 (E-3) stainless steel are provided to manage <br /> condensation from heat exchanger cells. <br /> AG9: Gas controls designed for makeup air heating applications. Furnace is provided with an electronic <br /> modulating gas regulator which provides for firing rates between 50% and 100%. The modulating <br /> regulator is controlled by a duct sensor thermistor and remote temperature selector. The temperature <br /> selector is shipped separate so as to be mounted in a convenient location by the customer, to control <br /> discharge air within a range of 55 to 90 degrees Fahrenheit. The modulating regulator regulates gas <br /> discharge pressure when discharge air temperature drops below a setpoint, if low fire cannot satisfy <br /> the duct sensor setting, gas pressure is increased, increasing input. Setpoint is adjustable at the <br /> remote temperature selector, within a range from 55 to 90 degrees (F). A main redundant safety <br /> shut-off valve includes a servo regulator which maintains constant gas pressure to the modulating <br /> regulator under wide variations in gas supply pressure. This valve also includes the safety pilot valve, <br /> and the manual shutoff valve. Manufacturer furnishes a field-installed DPST wall switch for On-Off <br /> Control of unit. <br /> AK5: 208 Volt, Three Phase, 60 cycle supply voltage. <br /> AL6: 1 HP 1800 RPM open style blower motor <br /> AM20: Fan/drive at 1351-1400 RPM <br /> AS2: 100% outside air screened inlet hood with moisture eliminator louvers <br /> M 'Ck7 <br /> AW11: Filter rack with 2" disposable pleated filters <br /> AY2: Single wall with insulation <br /> BG9: Exhaust fan interlock relay <br />