Laserfiche WebLink
4.5.2 Venting Installation 4.5.3 Termination <br /> Sequence Considerations <br /> 1. Install the water heater. Check to determine whether local codes <br /> supersede the following clearances: <br /> 2. Determine the termination method—horizontal <br /> or vertical, concentric, or twin pipes, etc. • Avoid termination locations near a dryer <br /> vent. <br /> 3. Determine proper location for wall or roof • Avoid termination locations near commer- <br /> penetration for each termination. cial cooking exhaust. <br /> 4. Install termination assembly as described • Avoid termination locations near any air <br /> in this manual or in the vent manufacturer's inlets. <br /> installation instructions. • You must install a vent termination at least <br /> 5. Install air and vent piping from water heater to 12 in. above the ground or anticipated <br /> termination. snow level. <br /> 6. Slope horizontal exhaust run towards the The vent for this appliance shall not terminate: <br /> water heater 1/4 in. per foot. DO NOT slope • Over public walkways. <br /> combustion air pipe towards water heater. <br /> • Near soffit vents or crawl space vents or <br /> 7. Install vent supports and brackets allowing other areas where condensate or vapor <br /> for movement from expansion, or as per vent could create a nuisance or hazard or <br /> manufacturer's instructions or local code cause property damage. <br /> requirements. • Where condensate or vapor could cause <br /> 8. Install vent screen (supplied with water damage or could be detrimental to the <br /> heater) on PVC combustion air and exhaust operation of regulators, pressure relief <br /> termination elbows as illustrated below. valves, or other equipment. <br /> • Press vent screen inside of termination Listed below are important considerations for <br /> piece/elbow. locating vent termination under a soffit(ventilated <br /> • Secure vent screen to the elbow with or unventilated or eave vent; or to a deck or <br /> screw provided. porch): <br /> • Do not install vent termination under a <br /> soffit vent such that exhaust can enter the <br /> soffit vent. <br /> Install vent termination such that exhaust <br /> j and rising moisture will not collect under <br /> eaves. Discoloration to the exterior of the <br /> building could occur if installed too close. <br /> Figure 14: Vent Screen <br /> • Do not install the vent termination too <br /> close under the soffit where it could pres- <br /> ent recirculation of exhaust gases back <br /> into the combustion air part of the termina- <br /> tion. <br /> Rinnai Tankless Water Heater Installation and Operation Manual 27 <br />