Hoshizaki KM-500MAH Service Manual page 23

2) Defrost Timer
No adjustment is required under normal use, as the Defrost Timer is adjusted to the suitable
position. However, if necessary when all the ice formed on the Evaporator does not fall into
the bin in the harvest cycle, adjust the Defrost Timer to longer setting by adjusting the Dip
Switch (No. 1 & 2) on the Controller Board.
Dip Switch
No. 1
OFF
ON
OFF
ON
3) Drain Timer
The Drain Timer is factory-adjusted, and no adjustment is required.
Dip Switch
No. 3
OFF
ON
OFF
ON
T1: Time to drain the Water Tank
T2: Time to restrain defrost completion
4) Drain Counter
Do not adjust the Drain Counter, or the Evaporator may freeze up.
The Drain Counter is factory-adjusted to drain the Water Tank every 10 cycles, and no
adjustment is required. However, where water quality is bad and the icemaker needs a
pump drain more often, the Drain Counter can be adjusted as shown in the table below:
SETTING
Dip Switch
No. 2
OFF
OFF
ON
ON
SETTING
Dip Switch
No. 4
OFF
OFF
ON
ON
CAUTION
TIME
60 seconds
90 seconds
120 seconds
180 seconds
TIME
T1
10 seconds
10 seconds
10 seconds
20 seconds
23
T2
150 seconds
180 seconds
120 seconds
180 seconds