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127
Section H - Water System
Resistance Check
To test the diodes you can use a ohm meter with at least a 10K ohm or higher
scale. Take a reading across the diode, reverse your leads and take another
reading, the diode should check 10 times higher in one direction than the other.
Voltage Check for Water to Icemaker
You can also use a volt meter to check the circuit. Connect a volt meter to the
water valve coil of the primary valve, and connect a second volt meter to the green
coil of the secondary valve. Start Icemaker into a Harvest cycle by holding the
Icemaker ON/OFF switch in the ON position until the sweep arm advances to the 2
o'clock position. Then let go of the switch and let the Icemaker advance through a
cycle on it's own. A voltage check at the primary valve should yield 42-58 VAC,
which is normal and 95-105 volts at the secondary (green coil).
Digital Meter
If you are using a good meter you will read between 0 and 10 volts with a open
diode on the primary valve but you will have over 90 at the secondary.
Voltage Drop From Heater
In checking the voltage on a ice maker fill you must keep in mind that the coils of
the water valves are in series with the heater on the ice maker. The resistance of
the heater will cause a drop in voltage. Example, if you have 110 to120 at the outlet
with the product running, between 95 and 105 will be present at the green coil of
the secondary valve.
Voltage Readings Are Different Between Primary And
Secondary Valve Coils
If you are getting 10 volts or less at the primary valve but you are getting 95 to 105
at the secondary you have a bad diode. If you are getting 42 to 58 volts at the
primary valve and 90 or higher at the secondary this is normal. With the current
flowing to the primary valve coil through the diode you are getting 30 cycle instead
of 60 cycle current at the coil of the primary valve. Because of this your meter will
only read about 1/2 the voltage that is going to the coil.
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