Noritz NR98-DVC-CA Installation Manual

Also see for NR98-DVC-CA: Owner's guide

Contents

Noritz NR98-DVC-CA Installation Manual Manual pdf 19 page image

1911. Plumbing ApplicationsRecirculation SystemCombination Potable Water and Space Heating SystemCold Water SupplyIsolationKit(*4)Gas SupplyAquastat(*3)Pump Control Signal(*2)Relay for Pump(if larger than 85 Watts)Hot WaterOptional 30-38L (8-10 Gallon)Storage Tank(To alleviate cold water sandwich)GlobeValvePump(*1)Expansion Tank(Install accordingto local code)FixturesHot Water ReturnRBWPump120VCA105NeutralGroundLiveSIsolationKit(*1)Gas SupplyBackflow Preventer(optional)CheckValve(*3)Cold WaterSupplyMixing Valve(*5)Hot WaterPump(*2)Flow Switch(*4)FixturesAir HandlerUse Honeywell Aquastat(Model L6006A or L6006C)Aquastat WiringOptionalExpansion Tank(*6)Notes:Notes: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 11.3 L/min.(3 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 11.3 L/min. (3 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.1. Size the pump to provide a maximum of 7.5 L/min.(2 GPM) through the system at 3m (10 ft) of headplus piping losses.Adjust the flow using a globe valve and verify theflow rate with the maintenance monitors.2. Pump Control Signal is the preferred methodto control the recirculation pump.For pumps larger than 85W, a relay connection mustbe used. If the Pump Control Signal is not used,an Aquastat may be used to control the pump.3. Use an Aquastat if the water heater is not control-ling the pump.Set the Aquastat to 5°C (10°F) below the setoutput temperature.4. 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.NORITZTankless GasWater HeaterNORITZTankless GasWater Heater