20
Periodic Maintenance
If the water drain valve (with water filter) is covered with debris, the hot water may not run
smoothly, 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)
* Water will be discharged from the drain plug.
Place a container, etc. to receive the discharged
water.
1. Close the water supply valve.
2. Open all hot water fixtures.
3. Remove the inlet and outlet drain plugs (about
0.3 gal. will drain out)
4. Take the water drain valve (with water filter) out
of the inlet. (See illustration to right).
5. Clean the water drain valve (with water filter) with
a brush under running water.
6. Replace the water drain valve (with water filter).
(Take care not to lose the packing.)
7. Close all hot water fixtures.
8. Open the water supply valve and check that
water does not leak from the drain plugs or water
drain valve (with water filter).
Water Supply
Valve
Regular Maintenance-2
Inlet
Packing
Drain Plug
(with filter)
Optional Maintenance
* Isolator valve kits may be purchased as an
accessory from Noritz (Part #IK-WV-2).
They allow for one man full diagnostic testing
and easy flushing of the system.
* The kit includes two full port isolation valves
and a pressure relief valve for the hot side.
Contact Noritz for more information.
Water Heater Service Valves (IK-WV-2)
Water Intlet
Water Outlet
Drain
Hot Water
Service Valve
Pressure Relief Valve
Cold Water
Service Valve
