HP 422690 I manual Providing Venting and Combustion AIR, General Venting Guidelines

SECTION 4. PROVIDING VENTING AND COMBUSTION AIR

This furnace must be connected to a plastic venting system adequate to remove flue gases to the outside atmosphere. It must be vented in accordance with these instructions and local building codes.

The furnaces covered by this manual are design-certified as Category IV appliances. Category IV appliances operate with a positive vent static pressure and with a flue gas temperature that will produce significant condensate in the vent. The vent system for this furnace must be installed so as to prevent leakage of flue gases into the building. This furnace may be installed using either direct venting or non- direct venting.

WARNING: Do not connect this furnace to a vent system shared by any other appliance. Do not connect it to any other type of vent system other than described by these instructions. Improper venting could allow combustion products to collect in building during use resulting in nausea or death by asphyxiation.

GENERAL VENTING GUIDELINES

??Vent system and combustion air supply components must be constructed of schedule 40 PVC, PVC -DWV, SDR26, SDR 21 or ABS plastic pipe, fittings, sealants, and installation procedures that conform to the following ANSI/ASTM standards:

PVC	ASTM D-1785
SDR26, SDR21	ASTM D-2241
PVC-DWV	ASTM D-2665
PVC-DWV Cellular Core	ASTM F-891
PVC Primer And Solvent Cement	ASTM D-2564
ABS Pipe And Fittings	ASTM D-2235
Procedure For Cementing Joints	ASTM D-2855

??All condensate formed in the vent must run back toward furnace for proper drainage. Install vent pipe with no less than a 1/4 inch per foot slope from furnace to vent terminal.

??Install vent pipe without dips or sags that may hold water. Support horizontal portions of vent pipe every 5 feet (3 feet for SDR-21 or SDR-26 pipe).

??Protect vent from freezing. Long runs of vent pipe installed in an unconditioned space may require insulation to prevent freezing of condensate.

??Furnace can be vented from either left or right side. See Figure 2. As shipped, furnace is setup for venting

through the left side. Right side venting is accomplished by rotating flue outlet fitting and adding a street elbow to the drain fitting. Street elbow and instructions are supplied in the furnace parts package.

??Some models are shipped with a 3-inch to 2-inch reducer bushing. When venting with two-inch pipe, install reducer bushing in flue outlet fitting.

Figure 2. Vent Connection to Furnace.

PVC PIPE INSTALLATION INSTRUCTIONS

1.Cut ends of pipe square using a miter box, power saw or PVC tubing cutter. Put a 10 to 15 degree chamfer on end of pipe. Remove any burrs, dirt, grease, and moisture. Check joint for proper fit.

2.Freely coat outside end of pipe and inside of fitting socket with cleaner-primer. The purpose of the primer is to dissolve and penetrate the surface of the pipe. Several coats may be necessary to do this.

3.While primer is still wet, apply a heavy coat of solvent cement to outside of pipe. Next, using outward strokes to keep excess cement out of socket, apply a generous coat of cement to the inside of socket.

4.While both surfaces are still wet with cement, insert pipe into fitting socket until it bottoms out, using a slight twisting motion (1/4 turn). Hold pipe in socket 30 seconds to allow cement to set.

5.Allow joint to cure before handling.

Caution: Keep solvent cement container sealed when not in use. Do not use solvent cement that has thickened or is gel-like.

WARNING: PVC cements are highly flammable. Do not use near open flames. A fire or explosion could result. Avoid prolonged breathing or contact with skin or eyes.

Installer’s Information Manual Page 5