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0 0 VENTING INSTALLATION CATEGORY IV APPLIANCE 8 WARNING appliances IV appliances operate with a positive vent (exhaust) static pressure and with vent gas temperatures low enough to Breathing Hazard - Carbon Monoxide Gas produce condensate in the vent piping. • Install vent system in accordance with codes. POWER VENT CONFIGURATION • Do not operate water heater if exposed to flooding or Power Vent configurations derive all combustion air from the water damage room where they are installed and discharge all flue gases to ° : • Special consideration must be taken with installations :8:e" °" above 10,000 feet(3,048 m)refer to high altitude the outdoor atmosphere through a sealed vent (exhaust) pipe. :°`. .: "°•' section of this manual. 8e'>:° Power vent configurations have one vent pipe connected to the °s^;' • • Do not operate if soot buildup. • Do not obstruct water heater air intake with insulating water heater which can be terminated in a vertical or horizontal jacket or blanket. arrangement.See Figure 42 and Figure 43 on page 35. • Do not place chemical vapor emitting products near DIRECT VENT CONFIGURATION water heater. • Gas and carbon monoxide detectors are available.;ii; Direct Vent configurations derive all combustion air directly from the • Never operate the heater unless it is vented to the outdoor atmosphere through a sealed intake air pipe and discharge all outdoors and has adequate air supply to avoid risks fluegases to the outdoor atmosphere through a sealed vent exhaust of improper operation,fire,explosion or asphyxiation. p g (exhaust) •Analyze the entire vent system to make sure that pipe.Direct Vent configurations have two pipes connected to the water condensate will not become trapped in a section of heater,one vent pipe and one intake air pipe.Direct Vent configurations vent pipe and therefore reduce the open cross can be terminated in one of seven different arrangements.See Figure sectional area of the vent. 44 on page 35 through Figure 49 on page 36. Breathing carbon monoxide can cause brain damage or death. Always read and understand the instruction manual. GENERAL VENTING INSTRUCTIONS Never operate the water heater unless it is vented to outdoors. These instructions must be followed on all installations. The instructions in this section of the manual must be followed 1. DO NOT install the water heater in a Power Vent configuration to avoid choked combustion or recirculation of flue gases. Such unless there is adequate supply of fresh air,see Air Requirements conditions cause sooting of the combustion chamber,burners and flue tubes and creates a risk of asphyxiation. on page 17. If the installation space does not provide an adequate supply of fresh air the water heater must be installed in a GENERAL VENTING INFORMATION Direct Vent configuration. The water heaters covered in this manual are Category IV 2. If the water heater is to be installed in a beauty shop,barber shop, appliances and may be installed in either a Power Vent or Direct cleaning establishment, a laundry with dry cleaning equipment Vent configuration. or any space with contaminated air it is imperative that the water APPROVED MATERIALS heater(s)be installed in a Direct Vent configuration so that all air for Approved vent and intake air pipe materials that may be used in combustion is derived from the outdoor atmosphere. the United States: 3. The vent and intake air piping must terminate outdoors. PVC pipe materials: 4. The minimum clearance from combustible materials for the vent • DWV ASTM-D2665 or CSA B181.2 (exhaust) and intake air piping shall be 0 inches. Vent piping • Schedule 40, 80, 120 ASTM-D1785 or CSA B137.3 passing through a combustible wall or ceiling must be a continuous • SDR Series ASTM-2241 or CSA B137.3 run(no joints). CPVC pipe materials: 5. The water heater must be protected from freezing downdrafts • CPVC 41 ASTM-D2846 or CSA B137.6 during shutdown periods. • Schedule 40, 80 ASTM-F441 or CSA B137.6 6. The vent(exhaust)pipe must not be combined or connected to any • SDR Series ASTM-F442 other appliance's vent system or chimney. Polypropylene-See page 28 7. The intake air pipe must not be combined or connected to any • M & G Duravent PolyPro vent system other appliance's intake air piping. • Centrotherm InnoFlue vent system 8. Locate the water heater where the vent (exhaust) and intake air AL29-4C Stainless Steel-See page 29 piping will remain within the maximum equivalent lengths allowed. • HeatFab Saf-T Vent See Venting Requirements on page 22. • Duravent FasNSeal 9. Do not install the vent or intake air piping in a manner that will allow Approved vent pipe materials that must be used in Canada: water to be trapped in the piping. • ULC S636 PVC/CPVC 10.Vent pipes must be pitched a minimum of a 1/4 inch per foot back • ULC S636 Polypropylene-See page 28 to the water heater(to allow drainage of condensate). • AL29-4C Stainless Steel-See page 29 11.Do not anchor the vent or intake air pipe directly to framed walls, Approved intake air pipe materials that must be used in Canada: floors or ceilings unless rubber isolation pipe hangers are used to PVC pipe materials: prevent vibration noise from being transmitted. • DWV ASTM-D2665 or CSA B181.2 12.Use only approved vent/intake air pipe sizes and materials. See • Schedule 40, 80, 120 ASTM-D1785 or CSA B137.3 Venting Requirements on page 22. • SDR Series ASTM-D2241 or CSA B137.3 13.Use only factory supplied vent and intake air,concentric or low profile CPVC pipe materials: terminations.See the Venting Requirements on page 22. • CPVC 41 ASTM-D2846 or CSA B137.6 14.Do not locate the vent (exhaust) or intake air terminations where • Schedule 40, 80 ASTM-F441 or CSA B137.6 they would be objectionable due to noise at the termination(s).This • SDR Series ASTM-F442 includes locations close to or across from windows and doors. Polypropylene-See page 28 15.Direct venting into dead air spaces such as alleys,atriums,and inside • M &G Duravent PolyPro vent system corners can cause recirculation of flue gases. Recirculation of flue • Centrotherm InnoFlue vent system gases will cause sooting,premature failure of the heat exchanger and AL29-4C Stainless Steel-See page 29 icing of the combustion air intake during severe cold weather.To prevent • HeatFab Saf-T Vent the recirculation of flue gases, maintain as much distance as possible • Duravent FasNSeal between the intake air and vent terminations. NOTE: The use of cellular core PVC (ASTM F891), cellular core 16.Do not locate the vent termination over a public area where CPVC,or Radel®(polyphenolsulfone)in non-metallic venting systems condensate or vapor can cause a nuisance or ice hazard. is prohibited.Covering non-metallic vent pipe and fittings with thermal 17.Ensure the screens in the factory supplied terminations are securely INSULATION IS PROHIBITED. installed to prevent blockage in the vent system.