Noritz NR71-SV Installation Manual

Also see for NR66-OD: Instructional manual Service manual Owner's guide Installation manual Installation manual

Contents

Noritz NR71-SV Installation Manual Manual pdf 20 page image

2010. Plumbing ApplicationsRecirculation SystemCombination Potable Water and Space Heating SystemCold Water SupplyIsolationKit(*3)Gas SupplyAquastat(*2)Hot WaterOptional 30-38L (8-10 Gallon)Storage Tank(To alleviate cold water sandwich)GlobeValvePump(*1)Expansion Tank(Install accordingto local code)FixturesHot Water ReturnRBWPump120VAC105NeutralGroundLiveSIsolationKit(*1)Gas SupplyBackflow Preventer(optional)CheckValve(*3)Cold WaterSupplyMixing Valve(*5)Hot WaterPump(*2)Flow Switch(*4)FixturesAir HandlerNotes:Notes:Use Honeywell Aquastat(Model L6006A or L6006C)Aquastat Wiring1. Size the pump to provide a maximum of 5.7 L/min.(1.5 GPM) through the system at 3m (10 ft) ofhead plus piping losses.Adjust the flow using a globe valve and verify theflow rate with the maintenance monitors.2. Set the Aquastat to 5°C (10°F) below the setoutput temperature.3. Noritz recommends the use of an Isolation Kitwith the installation.These kits include an integrated shut-off and serv-ice valve with unions and a pressure relief valve.1. Noritz recommends the use of an Isolation Kit withthe installation.These kits include an integrated shut-off and serv-ice valve with unions and a pressure relief valve.2. Size the pump to provide a maximum of 7.5 L/min.(2 GPM.) with a head pressure equal to the lossthrough the water heater and Air Handler.3. Check valve required if it is not included with thepump.4. Set the flow switch to deactivate the Air Handler whenthe domestic hot water flow reaches 7.5 L/min. (2 GPM.)Adjust as necessary to prevent cycling.5. If the system requires water for space heating ata higher temperature than for other uses, meanssuch as a mixing valve shall be provided to temperthe water for the other uses to help prevent scald-ing.6. Expansion tank required if a backflow preventer isinstalled.OptionalExpansion Tank(*6)NORITZTankless GasWater HeaterNORITZTankless GasWater Heater