Noritz NR50-OD Service Manual

Also see for NRC111-DV: Installation manual Installation manual Owner's guide Instructional manual Installation manual

Noritz NR50-OD Service Manual Manual pdf 89 page image

89Periodic MaintenanceIf the water drain valve (with water filter) is covered with debris, the hot water may not runsmoothly, or the unit may put out cold water. Check and clean the filter as explained below.* To avoid burns, wait until the equipment cools down before draining the water.The appliance will remain hot after it is turned off.Water Drain Valve (with Water Filter)1. Close the water supply valve.2. Open all hot water fixtures.3. With a bucket ready, remove the inlet and outletdrain plugs (up to 0.5 gal. will drain out)4. Take the water drain valve (with water filter) outof the inlet. (See illustration to right).5. Clean the water drain valve (with water filter) witha brush under running water.6. Replace the water drain valve (with water filter)and close the drain plugs.(Take care not to lose the packing.)7. Close all hot water fixtures.8. Open the water supply valve and check thatwater does not leak from the drain plugs or waterdrain valve (with water filter).Water SupplyValveInletPackingWater drain valve(with water filter)Periodic MaintenanceIf the unit becomes saturated with lime or scale build-up, the hot water may not run smoothly, or the unitmay put out cold water. In addition, damage can occur resulting in failure of the unit if lime or scaledeposits are left untreated within the unit. To remove these deposits from the unit, follow the procedureas explained below. To ensure full warranty coverage, hard, acidic, or otherwise impure water should betreated with approved methods.Note : Isolation valves will need to be installed in order to perform this procedure.1. If not already on, turn the unit on with the Power Button on the Remote Controller.2. Close the gas supply valve.3. Close both the hot and cold water valves with a quarter turn of the main valve wing handle.The handle will be perpendicular to the main valve body.4. Ensure the drain valve lever handles are closed on both the hot and cold valves (the leverwill be perpendicular to the drain portion of the body) and slowly remove drain caps. Be sure toretain the rubber washer inside of the drain cap.5. Connect the pump outlet hose to the cold water drain valve of the isolation valve as shown in Figure 1.6. Connect a drain hose to the hot water drain valve outlet of the isolation valve as shown in Figure 1.7. Pour approximately 5 gallons of virgin food grade white vinegar or a solution of Lime Away(or CLR) and water (diluted 3 parts water to 1 part Lime Away or CLR) into a bucket.8. Place both the pump inlet hose and the drain outlet hose into the pail.9. Open both drain valve lever handles on the isolation valves.PackingInletLidWater drain valve(with water filter)For NC380-SV-ASME/N-1321M-ASME