John Wood Noritz N-069M-DV - Manual (Page 22)

22
Temperature
Troubleshooting-2
The water is cold when only a
single fixture is open.
• The unit will not heat the water if the flow rate is less than
0.7 gallons per minute.
Open the fixture more or open other fixtures so that a greater
flow passes through the unit, and the unit should begin
heating again.
• Are the gas and water supply valves fully open?
• Is the water temperature setting appropriate?
( p.12 and p.13)
• If the amount of hot water required is very high, it is
possible for the temperature to be lower than the temp-
erature set on the remote controller.
Decrease the amount of water passing through the unit
and the temperature should stabilize.
The water is not hot enough.
Amount of Hot Water
The amount of hot water at a
certain fixture is not constant. • When hot water is demanded at other fixtures, the
amount available may be reduced. The maximum flow
available from this unit is 6.9 GPM at a 45
°
F temp. rise.
• Pressure fluctuations and other plumbing conditions can
cause the temperature and pressure at a fixture to be
unstable, but it should stabilize after a short time.
• There are some types of hot water taps that discharge large
volumes of hot water initially, but stabilize after time.
• To keep the temperature stable, the heater limits the
amount of water that can flow through it to a small
amount initially, but the amount increases over time.
The amount of hot water in the tub
is less/more than the set amount. • When hot water is used for other fixtures while filling the
bath tub, the tub will not fill as much.
• If there is water in the tub already, or when filling is stopped
and resumed, the tub will fill more.
The flow meter alarm does not
sound even when filled to the set
amount.
• The flow meter alarm is set to sound when hot water
is continuously discharged for the set volume of water. If mixing
valves are used, or if cold water is mixed with hot water at the
fixture, the tub will fill more than the setting of the flow meter
alarm.
Amount of hot water available
has decreased over time. • Is the water drain valve filter clogged? ( p.20)
Fluctuations in hot water
temperatures.
• Set water temperature at 115
°
F to 120
°
F. This will allow you
to use a higher flow of hot water thus meeting the minimum
flow requirement of 0.7 gpm.
• Clean the water filter of any debris ( p.20)
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