Hoshizaki MWH KM-515MAH, MRH/3, MRH KM-901MAH, MWH(-M), KM-320MAH Shutdown Mechanical Bin Control

is complete. The pump-out frequency control (S4 dip switch 5 & 6) is factory set, and generally no adjustment is required. However, the pump‑out frequency control can be set to have a pump-out occur every cycle, or every 2, 5, or 10 cycles. For details, see "III.C.4. Pump‑Out Frequency Control (S4 dip switch 5 & 6)."

Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above), after 5 min. of freeze disconnect CB black K5 connector (FS connector). Check that PM stops and re-starts and that PM rotation is correct (water flowing down the drain through CV). If PM does not stop and re-start, check that CB LEDs 1, 3, and 2 are on. If not, replace CB. If LEDs 1, 3, and 2 are on and PM does not energize, check for 115VAC at CB K1 #5 (DBU) to neutral (W). If 115VAC is not present, replace CB. If 115VAC

is present, check that X10 relay is de-energized. If not, check X11 relay status. If X11 relay is energized, replace CB. If X11 relay is de-energized and X10 relay is energized, replace X11 relay (contacts sticking). If X10 relay is de-energized, check for 115VAC at terminal #6 (DBU) to neutral (W) and terminal #2 (DBU) to neutral (W). If 115VAC is present on terminal #6 (DBU) and not on terminal #2 (DBU), replace X10 relay. If PM is energized and rotating in pump-out rotation, make sure the drain line is not clogged and that CV is clean and operating properly.

Confirm FM and LLV de-energize. If FM or LLV are energized with LEDs 1, 3, and 2 on, replace CB.

8) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5a) above.

Note: Appliance continues to cycle until MBC is satisfied or power is switched off. The appliance always restarts at the 1-min. fill cycle.

9)Shutdown

Mechanical Bin Control:

See "II.D.2. Mechanical Bin Control Check."

Legend: CB–control board; Comp–compressor; CV–check valve; FM–fan motor; FMR–fan motor remote; FS–float switch; HGV–hot gas valve; HM–headmaster (C.P.R.); HPS–high-pressure switch; LLV–liquid line valve; MBC–mechanical bin control; PM–pump motor; TXV–thermostatic expansion valve; WRV–water regulating Valve; WV–inlet water valve

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