Drain Pan Heater - Viking VCSB542 Service Manual

Service Diagnostics and Procedures
To avoid electrical shock which can cause severe personal injury or death, disconnect power to refrigerator using power
switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure correct earth
ground and polarization. After servicing, reconnect power using power switch.
Dual Water Valve System–Dispenser
Model (continued)
the ice maker. The purpose of the dual valve is so
that if one valve mechanically sticks open, the other
would inhibit a flood condition
To access the water valves, remove the lower access
panel to expose the fill valves. To check the valves,
use an Ohm meter and verify coil resistance is
Ω
approximately 192.2 .
Water
Ice
maker
Primary Inlet Connection
New Single-Dual Water Valve System –
Dispenser model (as of 5/19/2010)
As of serial number 51910R00004065 (48") and
51910R00004050 (42"), a new single valve and
operating relay was introduced.
When the water dispenser is activated, 120VAC is sent
to the primary water valve, secondary water valve and
relay coils shown. The primary coil opens and allows
water to flow through the water filtrations system, then
back into the secondary valve and then out (water) to
the door dispenser. The relay directs power to the
primary valve so that either the water dispenser switch
or the ice maker may operate the primary valve.
When the ice maker calls for a fill cycle, 120 VAC is
sent to the primary valve and secondary (ice) valve, but
not the relay. Water is sent through the primary valve
to the filter, into the secondary valve and then out (ice)
to the ice maker. The purpose of the single-dual valve
© 2010 Viking Preferred Service
Ice maker
Dual Valve -
Secondary
Water
Secondary Inlet Connection
system is so that if one valve mechanically sticks open,
the other would inhibit a flood condition.
Water
Primary
inlet valve
Primary Inlet Connection
Valve Relay

Drain Pan Heater

The unit uses a drain pan heater to evaporate
condensate created by the refrigerator cooling
process. The pan heater is energized once the float
switch closes supplying 120 VAC.
To access the drain pan heater, remove the lower
access panel, slide the drain pan heater assembly
out and the heater is accessible. Verify the
resistance is approximately 790
to the heater and that the float switch is closed.
If the switch is closed and no voltage is supplied,
verify wiring, power disconnect switch has not
been turned "On", and supply voltage. If voltage is
supplied, the float switch is closed, and the heater
does not energize, replace the heater.
Ice maker
Dual Valve
Secondary Inlet Connection
Ω
. Verify 120 VAC
67