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In lieu of local codes, the appliance shall be installed in accordance with one or more of the following standards. Manufactured homes in the U.S.A.: 1, Federal Manufactured Home Construction & Safety Standard (HU.D. Title 24, Part 3280), 2. National Fuel Gas Code (ANSI-Z223,1, NFPA-54). 3. National Electrical Code (NFPA 70). Manufactured homes in Canada: 1, Natural Gas and Propane Installation Code (CAN/CSA B149,1). 2. Canadian Electrical Code, Part 1 (CSA C22,1) 035-16328-002 Rev. C (0902) Recreational Vehicles in U.S.A.: 1. Standard on Recreational Vehicles (NFPA 1192, formerly NFPA 501C). 2. National Electrical Code (NFPA 70). Recreational Vehicles in Canada: 1, Unit installationshall comply with current CSA standard CAN/CGA-Z240.4.2 -Installation Requirements for Pro pane Appliances and Equipment in Recreational Vehi cles. 2. Unit electrical widng and grounding shall comply with current CSA standard C22.2 No.148/CAN/CSA-Z240.6.2 -Electrical Requirements for recreational vehicles. HIGH ALTITUDE INSTALLATION For elevation above 2,000 feet, derate furnace input 4% for each 1,000 feet of elevation above sea level. Derating is accomplished by reducing the orifice size. See Derating Chart for orifice size. In Canada, for elevations from 2000 to 4500 feet derate by reducing gas manifold pressure to 3.0" W.C. for natural gas and 9.0" W.C. for LP gas. IA CAUTIONj • Never attempt to alter or modify thisfurnace or any of its components. • Never attempt to repair damaged or inoperable components. Such action could cause unsafe operation, explosion, fire and/or asphyxiation. • If a malfunction has occurred, or if you feel that the furnace is not operating as it should, contact a qualified service agency or gas utility for assistance. MINIMUM FURNACE CLEARANCES Access for servicing is an important factor in the location of any furnace. A minimum of 24 inches should be provided in front of the furnace for access to the heating elements and controls. This access may be provided by a closet door or by locating the furnace 24 inches from a facing wall or partition. These furnaces are design certified for the following minimum clearances from combustible material in alcove or closet instanation Table 1: MINIMUM CLEARANCES CLOSET ALCOVE BACK 0" 0" SIDES 0" 0" FRONT 6" 24" TOP 2" 2" ROOF JACK 0" 0" DUCT 0" O" Unitary Products Group 035-16328-002C(0902) Rev. 6. RETURN AIR REQUIREMENTS Non-combustiblepans having one-inch upturned flanges are located beneath openings in the floor return duct CLOSET INSTALLATIONS system. Additional Requirements 7. Wiring materials located in the return duct system conform to Article 300-22 (B&C) of the National Electrical Additionalrequirements for floorand ceilingreturnsystem for Code (NFPA-70). closet installed sealed combustion heating appliance are given in the next paragraph. Gas piping is not run in or through the return duct sys 8. tem. Floor or Ceiling Return Air System 9. The negative pressure in the closet as determined byListed in the next paragraph are the conditions to be met by test with the air-circulating fan operating at high heating Manufactured Home Manufacturers to have U.L. acceptance speed and the closet door closed is to be not more nega of in-floor or ceiling return air systems of closet installed tive than minus 0.05-inch water column. direct vent forced air heating appliances for Manufactured Homes to be sold in the United States. For floor return systems, the manufactured home manu 10. facturer or installer shall affix a prominent marking on or 1. The return-air openi...

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