Section 5 Water System; Operation; Water Filter - Frigidaire LGUB2642LF2 Service Manual

Water System Operation
Water for both ice makers and the water dispenser is
controlled by a triple coil valve and a single coil valve
joined together as one, mounted just to the right of the
condenser on the cabinet. Plastic tubing connects the
water valve/valves to the ice maker fill tubes, the water
dispenser and water filter on models so equipped.
Water Valve
The french door bottom freezer refrigerator models
have one triple coil valve and one single coil valve (See
Figure 5-1). The green coil on the triple coil valve is
for the fresh food compartment ice maker, blue coil for
the freezer ice maker, and the yellow coil for the water
dispenser. The beige coil on the single coil valve is
energized for both water for the ice makers, and water
for the dispenser. Plastic tubing connects the primary
water valve to the filter, water tank and to the second-
ary valve.
On models with a single coil valve for a primary, there
are 3 diodes in the wiring harness connecting the coil of
the single coil valve to the 3 coils of the triple coil valve.
The diodes are used to prevent current leakage from
opening all coils on the triple coil valve every time the
single coil valve is energized. (See Figure 5-2)
If a diode is shorted and the single coil valve opens,
current leakage through the shorted diode will cause all
coils on the secondary valve to open causing water to
go into both ice makers and to the water dispenser at
the same time. If the diode fails in the open position,
the coil on the secondary valve will open, but the coil
on the primary valve will not. As a result, water will
not be supplied to the ice makers or the dispenser. All
diodes can be checked with an ohmmeter to see if they
are opened or shorted. The coils on all water valves
can be checked with an ohmmeter to see if the coils
are opened or shorted. If the coil checks bad, replace
the coil. If the coils check good and water pressure is
between 30-120 psi, and the valve will not allow water
to flow through, replace the valve. It is not necessary to
replace the whole valve assembly if one coil is bad. The
three valves can be separated and replaced individually.
Blue Coil
Freezer
Ice maker
A
Figure 5-1. Water Valve (Dispenser Model Shown)
Wa ter/Ice
Selector Switch
L1
On Dispenser
Dispenser
Actuator
Switch
Diodes
Green Coil
Ice Maker Fill Switch
Ice Maker Fill Switch
Yellow Coil - Water Dispenser Coil (Triple coil section of valve)
Beige Coil - Primary Coil (Single coil section of valve)
Green Coil - Food Compartment Ice Maker (Triple coil Section of valve)
Blue Coil - Freezer Ice Maker (Triple coil section of valve)
Figure 5-2. Diode Schematic
5-1
Water System
Green Coil
Fresh Food
Ice Maker
Yellow Coil
Dispenser
Brown Coil

Water Filter

Fill Solenoi d
Single Coil Va lve
Wa ter Fill Solenoi d
Dual Coil Va lve
Ice
Wa ter
Ye llow
Beige
Green
Blue
Blue
Coil
N