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Legend:
BC - bin control
Comp - compressor
DC - drain cycle
DT - drain timer
DV - drain valve
FMS - self-contained fan motor
FT - ll timer (low water safety)
GM - gear motor
GMPR - gear motor protect relay
LF/S - lower oat switch
UF/S - upper oat switch
WCR - water control relay
WV - inlet water valve
Components Energized when the Control Switch is in the "DRAIN" Position
The "DRAIN" position on the control switch is used when cleaning and sanitizing the unit. This allows
cleaner and sanitizer to drain from the reservoir and evaporator assembly. When switching to the "DRAIN"
position during the freeze cycle, the drain valve does not energize until the 150 second shutdown sequence
terminates (2. Shutdown & Restart).
Note: To bypass the 150 second shutdown sequence, move the power switch to the "OFF" position, place the
control switch in the "DRAIN" position, then move the power switch back to the "ON" position.
UF/S open
LF/S open (WV on)
WCR off
FT started (90 sec.)
WV on
Comp continues
FMS continues
GM continues
GMPR continues
DCM-500BAH(-OS), DCM-500BWH(-OS) Sequence Flow Chart and Component Operation
1. Startup
2. Ice Purge Cycle
WV on
LF/S closed
UF/S closed (WV off)
WCR on
WV off
GM on
GMPR on
Comp on
FMS on
WCR continues
GM continues
GMPR continues
Power switch "ON"
Control switch in "ICE"
1. Fill Cycle
3. Freeze Cycle
Rell
(90 seconds)
LF/S closed
UF/S closed (WV off)
WCR on
FT off (90 sec.)
WV off
Comp continues
FMS continues
GM continues
GMPR continues
Low Water Safety
UF/S open
FT exceeded
Comp continues
FMS continues
GM continues
GMPR continues
WV continues
Comp off
FMS off
WV continues
GM continues
GMPR continues
GM off
GMPR off
WV continues until
UF/S closes
90 seconds
60 seconds
If rell > 90 sec. FT, 150 second
shutdown sequence begins
60 seconds
150 sec. Shutdown Sequence
UF/S open
60 seconds
2. Shutdown & Restart
90 seconds
1. Bin Full
Comp off
FMS off
GM continues
GMPR continues
GM off
GMPR off
DV on (DC only)
3. Icemaker is Off
BC open or DC starts
Comp continues
FMS continues
GM continues
GMPR continues
2. Ice Purge Cycle
4. Ice Level Lowered
See "1. Fill Cycle" above
150 seconds
BC closed
or
20 Min. DT off (DC only)
DV off (DC only)
12 hour DT reset (DC only)
4. 12 Hour Drain Cycle
DV opens for 20 minutes every 12 hours
See "3. 12 Hour Drain Cycle" below.
3. 12 Hour Drain Cycle
Shutdown & Restart
1. Drain Cycle initiates
2. Ice Purge Cycle
3. Drain Cycle
4. 12 hour DC - Restart
See "1. Fill Cycle" above
DV on for 20 minutes