9
Dometic 4410N Commode
Theory of operation
Theory of 4410N commode operation
Refer to System Wiring Diagram located inside Control Module, and the below
photo
5
for reference in this section .
5
Parts list /
wiring diagram
AC / DC
power supply
Flush
switch
Relay
X1
Relay
X2
Fuses
115VAC is brought in through 2A fuses on both the hot and neutral legs, and is
converted to 24VDC through the Power Supply . +24VDC is always available at
the Add Water / Flush switch (through its red wire) and also at one side of the
cam switch in the commode base assembly . DC ground is always available at
the coils of Control Module (CM) relays X1 and X2, and at the flush valve motor .
Water Valve Actuation
The water valve is a fast-acting (~1 .6 sec) 24V electric ball valve that closes
with normal polarity and opens with reversed polarity . It has built-in limit stop
switches . CM relay X2 sends normal polarity to the water valve (+24V through
CM blue wire and DC ground through CM white wire) when commode is
powered but not being actuated in any way .
When “Add Water” is actuated via the switch, +24V is sent to relay X2’s coil
and it is energized, routing DC ground through the CM’s blue wire and +24VDC
through the CM’s white wire (reversed from normal) . These wires energize the
water valve as long as the “Add Water” switch is pressed . Releasing the “Add
Water” switch de-energizes relay X2, shutting the water valve .
The “Flush” function of the switch also actuates the above sequence through
diodes D1 and D2 .
