Water Supply - Dometic NDA1402 Service Manual

12.12 Water Supply

To operate properly, the water pressure in the water sup-
ply line must be greater than 15 lbs. psi. Lower water pres-
sure, water turned off, or obstructions or air in the water
line can cause low or no ice production. First check to see
that the water supply is fully turned on. Visually check the
line for kinks, etc. which might obstruct the flow of water.
To remove trapped air, loosen the connection at the water
solenoid valve of the appliance. Ensure that pressurized
water is reaching this point, and bleed off any air in the
line. Retighten the connection, making sure there are no
leaks.
In some cases a foaming/overspray will be noticed around
the fill cup area. This may be noticed if the water pressure
is unregulated or in excess of 40-50 psi.
To determine if foaming/overspray is happening:
•
Disconnect city water supply.
•
Turn water pump switch on.
•
Set the ice maker water supply line shut-off
valve to "full open".
•
Remove the ice bin.
•
Remove the cover from face of ice maker.
•
Rotate the ice maker main gear/sprocket using
channel-lock pliers until bail arm begins to lift.
•
Depress & hold the freezer door switch (to allow
AC power to pass into freezer compartment &
ice maker).
•
Allow ice maker to cycle.
• Just before end of cycle observe water fill at rear
of ice maker (shine flashlight into compartment
and observe cup).
Also, you can test the overspray scenario with city water
supply as well by reversing steps 1 & 2 to shut off the wa-
ter pump and connect to city water supply.
If foaming/spraying occurs:
1. Inspect/Replace water line insert.
• The larger insert (.140 ID) allows for greater flow
and greater possibility of overspray. The recom-
mended size should be (.125 ID).
.140 ID
.125 ID
•
The insert needs to be partially (not fully) insert-
ed into the clear tubing.
approx. 1/4"
•
Clear tube and insert need to be inserted into the
angled fill tube so that the insert is flush with the
edge of the fill tube.
• Spring clip needs be positioned so that it is firmly
pinching down onto metal insert.
In most applications, removing the upper side wall vent
will provide access to the ice maker fill tube. For applica-
tions using a roof vent, removal of the refrigerator may be
necessary.
2. Reduce the flow of water into ice maker.
• A permanent fix would be to regulate the water
supply using a pressure reducing valve before
the inlet side of our water solenoid valve (regulate
between 40 and 50 psi).
• A temporary solution in-the-field would be to
turn the manual shut-off valve "OFF". And then
reopen the valve approx 1/4 turn (less if a "ball"
type valve is used).
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Incorrect
correct