NC199 Owner's Guide

36
Periodic Maintenance
Optional Maintenance
Regular Maintenance-2
Ifthewaterdrainvalve(withwaterlter)iscoveredwithdebris,thehotwatermaynotrun
smoothly,ortheunitmayputoutcoldwater.Checkandcleanthelter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xtures.
3. With a bucket ready, remove the inlet and outlet
drain plugs (about 0.2 gallon (0.8L) will drain out)
4.Takethewaterdrainvalve(withwaterlter)outof
the inlet. (See illustration to right).
5.Cleanthewaterdrainvalve(withwaterlter)with
a brush under running water.
6.Replacethewaterdrainvalve(withwaterlter)
and close the drain plugs.
(Take care not to lose the packing.)
7.Closeallhotwaterxtures.
8. Open the water supply valve and check that
water does not leak from the drain plugs or water
drainvalve(withwaterlter).
* Isolation valves may be purchased as an
accessory from Noritz.
They allow for full diagnostic testing and easy
ushing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.
Isolation Valves
Water Supply
Valve
Inlet
Packing
Water drain valve
(withwaterlter)
Water Intlet
Water Outlet
Drain
Hot Water
Service Valve
Pressure Relief Valve
Cold Water
Service Valve
(Ex. NC1991-OD)
(Ex. NC1991-OD)