Hoshizaki IM-240DME Service Manual page 25

3) Defrost Control (VR2) 3) Defrost Control (VR2)
The defrost control regulates the time period between ice-drop and actuator motor restart. 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 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 below. When servicing or replacing the controller board, adjust the Variable Resistor VR2
using a miniature flat blade screwdriver. using a miniature flat blade screwdriver.
Ambient Temp. Ambient Temp.
30°C 30°C
20°C 20°C
10°C 10°C
4) Water Supply Control 4) Water Supply Control
When adjusting the Variable Resistor VR5 (Cube Control) for smaller dimple cubes, it may 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. be necessary to adjust the water supply time setting as well, following the instruction below.
Normal setting = 15 sec. with Water Plate closed Normal setting = 15 sec. with Water Plate closed
Note: 1. See "II. 2. [a] CONTROLLER BOARD" for location of the Jumper Wires. Note: 1. See "II. 2. [a] CONTROLLER BOARD" for location of the Jumper Wires.
2. Any adjustment will not be required under normal use. If an insufficient water supply 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 results in production of cloudy ice, check to see if the Filter of the Water Valve is
clogged or water pressure is reduced. clogged or water pressure is reduced.
3. In some areas where excessively hard water (approx. 250 ppm or more) results in 3. In some areas where excessively hard water (approx. 250 ppm or more) results in
production of cloudy ice, change the water supply time setting. Also, the Tank Drain production of cloudy ice, change the water supply time setting. Also, the Tank Drain
Pipe must be moved to the drain position to prevent concentration of calcium Pipe must be moved to the drain position to prevent concentration of calcium
carbonate, etc. See the figure below. carbonate, etc. See the figure below.
Water Pan Water Pan
E1CG4880210 E1CG4880210
Approximate Period (sec.) Approximate Period (sec.)
DEFROST PROCESS DEFROST PROCESS
OPEN OPEN
20 20
40 40
60 60
Cut the jumper wire JE (marked by arrow) by Cut the jumper wire JE (marked by arrow) by
a nipper. Water supply time will be 60 sec. a nipper. Water supply time will be 60 sec.
when the Water Plate is closed. when the Water Plate is closed.
Water Pan Water Pan
CLOSED CLOSED
ON ON
21 21
FREEZE PROCESS FREEZE PROCESS
Approx. 15 sec. Approx. 15 sec.
(90 sec. at start up) (90 sec. at start up)
LONGER LONGER