20
Periodic Maintenance
Regular Maintenance
Periodic Inspection
For laundry, newspaper, timber, oil,
spray cans and other combustible
materials near the heater or the
exhaust vent terminal.
For abnormal sounds
during operation.
For abnormalities in
external appearance,
discoloration or flaws.
For water leaks from
the equipment and
piping.
For proper operation of
pressure relief valve.
For dust and soot
in the flue terminal.
Be sure to do.
To prevent burns or scalding, turn off the power button and
wait until the equipment cools before performing maintenance.
Check
Check
Check
Check
Check
Check
CAUTION
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)
1. Close the water supply valve.
2. Open all hot water fixtures.
3. With a bucket ready, remove the inlet and outlet
drain plugs (about 0.2 gallon (0.95L) 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)
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 that
water does not leak from the drain plugs or water
drain valve (with water filter).
Water Supply
Valve
Inlet
Packing
Water drain valve
(with water filter)
(Ex. NR83DVC (GQ-2457WS-FFA US))
(Ex. NR83DVC (GQ-2457WS-FFA US))
(Ex. NR83OD (GQ-2457WS US))