Noritz NRC661-DV, Service Manual, Page: 72 / 78

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 wate r . Check and clean the filter as explained belo w.
* To avoid burns, wait until the unit 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 outlet
drain plugs (abou t 0.2 gallon (0.9 L) will drain ou t )
4. T ake 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 wate r.
6. Replace the water drain valve (with water filter)
and close the drain plugs.
(T ake 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).
W ater Supply
Valve
(Ex. NRC7 1 1-DV)
Inlet
Packing
Water drain valve
(with water filter)
72