Service Manual

11
2. Sequence Flow Chart
Legend: BC-bin control CB-control board Comp-compressor DCT-drain cycle timer (12-hr. timer) DV-drain valve DVT- drain valve timer (20-min. timer) FM-fan motor FT-ll timer (90-sec. low water safety timer) GM-gear motor LF/S-loweroatswitch UF/S-upperoatswitch 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 icemaker. 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-sec. shutdown sequence terminates (Shutdown & Restart). Note: To bypass the 150-sec. 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 FT starts (90-sec.) Comp continues FM continues GM continues WV energized
"DCM-PB" and "DCM-OS" Control Board Sequence Flow Chart
DCM-300BAH(-OS)
Cycle Steps
2. Ice Purge Cycle
WV energized
LF/S closed UF/S closed GM energized WV de-energized
GM continues Comp energized FM energized
Startup begins here
1. Fill Cycle
3. Freeze Cycle
Rell Maximum 90sec.
LF/S closed UF/S closed FT terminated Comp continues FM continues GM continues WV de-energized
FT Exceeded
UF/S open GM continues WV continues Comp de-energized FM de-energized
WV continues GM de-energizes
WV continues until UF/S closes
60 sec.
Shutdown Sequence
UF/S open
60 sec.
Shutdown & Restart
90 sec.
1. Bin Full
GM continues Comp de-energized FM de-energized
GM de-energized
3. Icemaker Off
BC open Comp continues FM continues GM continues
2. Ice Purge Cycle
4. Icemaker Restart
150-sec. Shutdown Sequence
BC closed
4. 12-Hr. Drain Cycle
DV opens for 20 min. every 12 hr. See "12-Hr. Drain Cycle" below.
12-Hr. Drain Cycle
1. Ice Purge Cycle
2. Drain
3. Icemaker Restart
•FT90sec.startswhenLF/Sopens
and terminated when UF/S closes.
to "1. Fill Cycle" above
•FTexceeded:CBstarts
shutdown sequence.
•WVenergizedcontinuously. •When UF/S closes, 2. Ice
Purge Cycle starts.
90 sec. FT
exceeded
60 sec.
to "1. Fill Cycle" above
60 sec.
DV energizes GM de-energized
DVT terminates
DCT terminates DVT starts GM continues Comp de-energizes FM de-energizes