Hoshizaki IM-21 Service Manual page 37

3) Defrost Control (VR2)
The defrost control regulates the time period between
ice-drop and actuator motor restart. Any adjustment
will not be required for normal operation. Factory
setting is shown in the table below. When servicing
or replacing the controller board, adjust the Variable
Resistor VR2 using a miniature flat blade screwdriver.
Approximate Period (sec.)
IM-21CLE
IM-25LE
IM-25CLE
IM-25WLE
Ambient IM-30CLE
Temp. IM-30WLE
30°C 20
20°C 30
10°C 60
4) Water Supply Control
When adjusting the Variable Resistor VR5 (Cube Control) for smaller dimple cubes, it may
be necessary to adjust the water supply time setting as well, following the instruction below.
Note: 1. See "II. 2. [a] CONTROLLER BOARD LAYOUT" for location of the Jumper Wires.
2. Any adjustment will not be required under normal use. If an insufficient water supply
results in production of cloudy ice, check to see if the Filter of the Water Valve is
clogged or water pressure is reduced.
a. IM-21CLE, IM-25LE/WLE, IM-25CLE, IM-30CLE/WLE, IM-45LE/WLE, IM-45CLE-25,
IM-65LE/WLE
Normal setting = 15 sec. with Water Plate open
IM-45LE
IM-45CLE-25 IM-65LE
IM-45WLE IM-65WLE
20
40
80
Cut the jumper wire JG (marked by arrow) by
a nipper. Water supply time will be continuous
when the Water Plate is open.
33
IM-100LE
IM-130LE
IM-130ME
IM-160ME
20 20
40 35
60 90
LONGER
IM-100WLE
IM-130WLE
IM-130WME
IM-240ME
IM-240WME
20
30
40