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Gas-fired heating equipment that has been improperly vented or which experiences a blocked vent condition may have flue gases accidentally spilled into the heated space. See page 20 for specific information about the blocked vent safety switch supplied on the unit. Installation must conform with local building codes or in the absence of local codes, with Part 7, Venting of Equipment, of the National Fuel Gas Code, ANSI Z223.1 (NFPA 54) - Latest Edition. In Canada installation must be in accordance with CAN/CGA-B149.1 for natural gas units, and CAN/CGAB149.2 for propane units. ! Model Number Gas Controls Category Single-Stage I PAE 30 Two-Stage II Single-Stage I Two-Stage II PAE/BAE 50-100 Modulating II PAE/BAE 125-400 All I Table 1 PAE/BAE Venting System Category Category Description Venting Requirements Negative vent pressure Follow standard I Non-condensing venting requirements. Negative vent pressure Condensate must be II Condensing drained. Positive vent pressure Vent must be gastight. III Non-condensing Positive vent pressure Vent must be liquid and Condensing gastight. Condensate IV must be drained. Table 2 ANSI Unit Heater Venting Requirements Heater Parts from ACF Greenhouses 5 Piping 1. Installation of piping must be in accordance with local codes, and ANSI Z223.1, “National Fuel Gas Code,” or CAN/CGA-B149 in Canada. Do not use flexible connectors. 2. Piping to units should conform with local and national requirements for type and volume and gas handled, and pressure drop allowed in the line. Refer to Table 4, to determine the cubic feet per hour (cfh) for the type of gas and size of unit to be installed. Using this cfh value and the length of pipe necessary, determine the pipe diameter from Table 1. Where several units are served by the same main, the total capacity, cfh, and length of main must be considered. Avoid pipe sizes smaller than 1/2”. Table 1 allows for the usual number of fittings with a 0.3” W.C. pressure drop. Where the gas supplied has a specific gravity other than 0.60, apply the multiplying factor as given in Table 2. 3. After threading and reaming the ends, inspect piping and remove loose dirt and chips. 4. Support piping so that no strains are imposed on unit or controls. 5. Use two wrenches when connecting piping to unit controls. 6. Provide a sediment trap before each unit and in the line where low spots cannot be avoided. (See Figure 4). 7. Take-off to unit should come from top or side of main to avoid trapping condensate. 8. Piping, subject to wide temperature variations, should be insulated. 9. Pitch piping up toward unit at least 1/4” per 15’ of horizontal run. 10. Compounds used on threaded joints of gas piping must be resistant to action of liquefied petroleum gases. 11. Purge air before lighting unit by disconnecting pilot tubing at combination gas control. In no case should line be purged into heat exchanger. 12. After installation, check system for ga...

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