York P*XU/G9D-UP Installation Instruction

Contents

035-17480-000 Rev. A (800)14 Unitary Products Group5. Disassemble the piping and apply cement primer andcement per the cement manufacturer's instructions.Primer and cement must conform to ASTM D2564 forPVC, or ASTM D2235 for ABS piping.6. All joints must be made to provide a permanent, air-tight,water-tight seal.7. Support the combustion air and vent piping such that it isangled 1/4” per linear foot so that condensate will flowback toward the furnace. Piping should be supportedwith pipe hangers to prevent sagging. Maximum spacingbetween hangers is five (5) feet, except SDR-PVC pip-ing, where maximum spacing is three (3) feet.8. Seal around the openings where the combustion air andvent piping pass through the roof of side wall.NOTE:Vent pipe must be sloped 1/4” per foot to allow con-densate to flow back to the furnace.METHOD TWO: ONE PIPE SYSTEMThis type installation will use combustion air from within thespace surrounding the furnace. This may be from within thespace in a non-confined location or it may be brought into thefurnace area from outdoors. It is not directly ducted into thefurnace. A single, properly sized pipe from the furnace ventconnector to the outdoors must be provided.For upflow models combustion air is brought into the furnacethrough the unit top panel opening. Do not install a pipe intothe intake collar on top of the burner box. Refer to Figure 16.COMBUSTION AIRAll installations must comply with Section 5.3, Air for Com-bustion and Ventilation of the National Fuel Gas Code, ANSIZ223.1 or Sections 7.2, 7.3 or 7.4 of CAN/CGA B149.1 or.2Installation Code - latest editions.An unconfined space is not less than 50 cubic feet per 1000Btu/hr input rating for all appliances installed in that area.Rooms communicating directly with the space containing theappliances are considered part of the unconfined space, ifopenings are not furnished with doors.A confined space is an area with less than 50 cubic feet per1000 Btu/hr input rating for all appliances installed in thatarea.The following must be considered to obtain proper air forcombustion and ventilation in confined spaces.Air Source from Inside the BuildingTwo permanent openings, one within 12 inches of the top ofthe confined space and one within 12 inches of the bottom,shall each have a free area of not less than one square inchper 1,000 Btuh of total input rating of all appliances located inthe space. The openings shall communicate freely with inte-rior areas having adequate infiltration from the outside.NOTE. At least 100 square inches free area shall be used foreach opening.Air Source from Outdoors1. Two permanent openings, one within 12 inches of thetop of the confined space and one within 12 inches of thebottom, shall communicate directly, or by means ofducts, with the outdoors or to such crawl or attic spacesthat freely communicate with the outdoors.a. Vertical Ducts - Each opening must have a freearea of not less than one square inch per 4,000 Btuhof total input of all appliances located in the space.EXAMPLE:b. Horizontal Ducts - Each opening must have a freearea of not less than one square inch per 2,000 Btuhof total input of all appliances located in the space.Solvent cements are flammable and must be usedin well-ventilated areas only. Keep them away fromheat, sparks and open flames (including pilots). Donot breathe vapors and avoid contact with skin andeyes.Vent piping must be insulated with 1/2” Armaflexinsulation if it will be subjected to freezing temper-atures such as routing through unheated areas orthrough an unused chimney.When combustion air pipe is installed above a sus-pended ceiling, the pipe must be insulated with 1/2” Armaflex type insulation. The combustion airpipe should also be insulated when it passesthrough a warm, humid space.FIGURE 16 : Upflow Vent Pipe Connection(P*XU / G9D-UP)MPC132OFFONCOMBUSTION AIRVENT PIPE CEMENTSINTO SOCKET JUSTUNDER TOP PANELTotal Input of All Appliances= Square Inches Free Area4000