Hoshizaki KMD-201AWA User manual

SERVICE MANUAL
HOSHIZAKI
MODULAR CRESCENT CUBER
MODEL KMD-201AA
KMD-201AWA
KMD-270AA
KMD-270AWA
NO. F049-817
ISSUED: SEP.30,2010
REVISED: JUN.15,2012
Kälte-Berlin
Inh.: Christian Berg
Am Pfarracker 41
12209 Berlin
Fon: +49 (0) 30 / 74 10 40 22
Fax: +49 (0) 30 / 74 10 40 21
eMail: [email protected]
Internet: http://www.kaelte-berlin.com
Direktlink Hoshizaki Crescent-Eisbereiter KMD201AA Bubble Tea zu Kälte-Berlin

i
CONTENTS PAGE
I. SPECIFICATIONS--------------------------------------------------------------------------------------- 1
1. DIMENSIONS/SPECIFICATIONS --------------------------------------------------------------- 1
[a] KMD-201AA (air-cooled)------------------------------------------------------------------------ 1
[b] KMD-201AWA (water-cooled)----------------------------------------------------------------- 2
[c] KMD-270AA (50Hz) (air-cooled)-------------------------------------------------------------- 3
[d] KMD-270AA (60Hz) (air-cooled)-------------------------------------------------------------- 4
[e] KMD-270AWA (50Hz) (water-cooled) ------------------------------------------------------- 5
[f] KMD-270AWA (60Hz) (water-cooled)-------------------------------------------------------- 6
II. GENERAL INFORMATION--------------------------------------------------------------------------- 7
1. CONSTRUCTION------------------------------------------------------------------------------------ 7
[a] KMD-201/270AA---------------------------------------------------------------------------------- 7
[b] KMD-201/270AWA------------------------------------------------------------------------------- 8
2. SEQUENCE OF OPERATION-------------------------------------------------------------------- 9
[a] ONE MINUTE FILL CYCLE-------------------------------------------------------------------- 9
[b] INITIAL HARVEST CYCLE--------------------------------------------------------------------- 9
[c] FREEZE CYCLE---------------------------------------------------------------------------------- 9
[d] DRAIN CYCLE ------------------------------------------------------------------------------------ 9
[e] NORMAL HARVEST CYCLE-----------------------------------------------------------------10
3. CONTROL BOARD ---------------------------------------------------------------------------------12
[a] CONTROL BOARD LAYOUT-----------------------------------------------------------------13
[b] FEATURES ---------------------------------------------------------------------------------------14
[c] CONTROLS AND ADJUSTMENTS---------------------------------------------------------16
[d] CONTROL BOARD CHECK PROCEDURE----------------------------------------------21
[e] CONTROL BOARD REPLACEMENT------------------------------------------------------21
4. HARVEST CONTROL – THERMISTOR -------------------------------------------------------22
5. FLOAT SWITCH--------------------------------------------------------------------------------------23
[a] EXPLANATION OF OPERATION-----------------------------------------------------------23
[b] CLEANING----------------------------------------------------------------------------------------23
[c] FLOAT SWITCH CHECK PROCEDURE--------------------------------------------------23
6. BIN CONTROL ---------------------------------------------------------------------------------------24
[a] EXPLANATION OF OPERATION -----------------------------------------------------------24
[b] BIN CONTROL CHECK PROCEDURE----------------------------------------------------24
7. SWITCHES --------------------------------------------------------------------------------------------25
[a] CONTROL SWITCH ----------------------------------------------------------------------------25
[b] SERVICE SWITCH------------------------------------------------------------------------------25
III. TECHNICAL INFORMATION ----------------------------------------------------------------------26
1. WATER CIRCUIT AND REFRIGERANT CIRCUIT------------------------------------------26
2. WIRING DIAGRAM ----------------------------------------------------------------------------------27
[a] KMD-201AA, KMD-201AWA------------------------------------------------------------------27
[b] KMD-270AA, KMD-270AWA (50Hz)--------------------------------------------------------28
[c] KMD-270AA, KMD-270AWA (60Hz)--------------------------------------------------------29
3. TIMING CHART---------------------------------------------------------------------------------------30
[a] KMD-201AA, KMD-201AWA------------------------------------------------------------------30
[b] KMD-270AA, KMD-270AWA------------------------------------------------------------------31
IV. SERVICE DIAGNOSIS------------------------------------------------------------------------------32
1. 10-MINUTE DIAGNOSTIC PROCEDURE -----------------------------------------------------32
2. DIAGNOSTIC CHARTS-----------------------------------------------------------------------------34
[a] NO ICE PRODUCTION ------------------------------------------------------------------------34
[b] EVAPORATOR IS FROZEN UP-------------------------------------------------------------36

ii
[c] LOW ICE PRODUCTION----------------------------------------------------------------------37
[d] ABNORMAL ICE---------------------------------------------------------------------------------38
[e] OTHER---------------------------------------------------------------------------------------------38
V. REMOVAL AND REPLACEMENT-----------------------------------------------------------------39
1. SERVICE FOR REFRIGERANT LINES --------------------------------------------------------39
[a] SERVICE INFORMATION---------------------------------------------------------------------39
[b] REFRIGERANT RECOVERY-----------------------------------------------------------------40
[c] EVACUATION AND RECHARGE------------------------------------------------------------40
2. BRAZING-----------------------------------------------------------------------------------------------41
3. COMPRESSOR---------------------------------------------------------------------------------------41
4. DRIER---------------------------------------------------------------------------------------------------42
5. HOT GAS VALVE ------------------------------------------------------------------------------------43
6. EXPANSION VALVE --------------------------------------------------------------------------------44
7. EVAPORATOR----------------------------------------------------------------------------------------45
8. WATER REGULATING VALVE – WATER-COOLED MODEL ONLY-------------------46
9. ADJUSTMENT OF WATER REGULATING VALVE – WATER-COOLED
MODEL ONLY -----------------------------------------------------------------------------------------47
10. FAN MOTOR ------------------------------------------------------------------------------------------47
11. PUMP MOTOR----------------------------------------------------------------------------------------48
12. WATER VALVE---------------------------------------------------------------------------------------49
13. DRAIN VALVE ----------------------------------------------------------------------------------------49
14. WATER TANK-----------------------------------------------------------------------------------------50
15. FLOAT SWITCH--------------------------------------------------------------------------------------51
16. BIN CONTROL SWITCH---------------------------------------------------------------------------52
17. THERMISTOR ----------------------------------------------------------------------------------------54
18. CONTROL BOX --------------------------------------------------------------------------------------55
[a] CONTROL & SERVICE SWITCH------------------------------------------------------------56
[b] FUSE------------------------------------------------------------------------------------------------56
[c] FUSE HOLDER-----------------------------------------------------------------------------------56
[d] CONTROL BOARD------------------------------------------------------------------------------57
[e] MAGNETIC CONTACTOR --------------------------------------------------------------------57
[f] CONTROL BOARD TRANSFORMER-------------------------------------------------------57
[g] STARTER------------------------------------------------------------------------------------------57
[h] RUN CAPACITOR-------------------------------------------------------------------------------57
[i] START CAPACITOR-----------------------------------------------------------------------------57
[j] CAPACITOR FOR PUMP MOTOR-----------------------------------------------------------58
19. SPRAY TUBE, WATER SUPPLY TUBE, SPRAY GUIDE ---------------------------------58
VI. CLEANING AND MAINTENANCE INSTRUCTIONS ----------------------------------------60
1. CLEANING---------------------------------------------------------------------------------------------60
[a] CLEANING PROCEDURE---------------------------------------------------------------------60
[b] SANITIZING PROCEDURE-------------------------------------------------------------------63
2. MAINTENANCE --------------------------------------------------------------------------------------63
[a] STAINLESS STEEL EXTERIOR-------------------------------------------------------------64
[b] STORAGE BIN AND SCOOP-----------------------------------------------------------------64
[c] AIR FILTER (AIR-COOLED MODEL ONLY)----------------------------------------------64
[d] CONDENSER (AIR-COOLED MODEL ONLY)-------------------------------------------64
3. PREPARING THE ICEMAKER FOR LONG STORAGE------------------------------------64

1
I. SPECIFICATIONS
1. DIMENSIONS/SPECIFICATIONS
[a] KMD-201AA (air-cooled)

2
[b] KMD-201AWA (water-cooled)

3
[c] KMD-270AA (50Hz) (air-cooled)

4
[d] KMD-270AA (60Hz) (air-cooled)

5
[e] KMD-270AWA (50Hz) (water-cooled)

6
[f] KMD-270AWA (60Hz) (water-cooled)

7
II. GENERAL INFORMATION
1. CONSTRUCTION
[a] KMD-201/270AA
Spray Guide
Spray Tube
Drain Valve
Water Supply Inlet
Water Tank
Cube Guide
Pump Motor
Float Switch
Condenser
Fan Motor
Hot Gas Valve
Compressor
Control Box
Expansion Valve
Harvest Water Valve
Fill Water Valve
Control Switch
Service Switch
Fuse Holder (Fuse)
Bin Control Switch
Drier
Thermistor
Access Valve
(Low Side)
Water Supply Tube
Access Valve
(High Side)
* Not provided for
later production

8
[b] KMD-201/270AWA
Spray Guide
Spray Tube
Drain Valve
Water Supply Inlet
Water Tank
Cube Guide
Pump Motor
Float Switch
Water Regulator
Condenser
Hot Gas Valve
Compressor
Control Box
Expansion Valve
Harvest Water Valve
Fill Water Valve
Control Switch
Service Switch
Fuse Holder (Fuse)
Bin Control Switch
Drier
Thermistor
Access Valve
(Low Side)
Water Supply Tube
Access Valve
(High Side)
* Not provided for
later production

9
2. SEQUENCE OF OPERATION
The steps in the sequence are as outlined below. When power is supplied, a 5 second delay
occurs at startup. Note that the order of the LEDs from the outer edge of the board is 5, 6, 8,
9, 4, 7.
[a] ONE MINUTE FILL CYCLE
LED 8 is on. HWV opens and the fill period begins. After 1 minute, the board checks for a
closed LF/S. If LF/S is closed, the harvest cycle begins. If not, HWV will remain energized
through additional 1 minute cycles until water enters the sump and LF/S closes. This serves
as a low water safety to protect the water pump.
[b] INITIAL HARVEST CYCLE
LEDs 5, 6, and 8 are on. HWV remains open, Comp energizes, HGV opens, and harvest
begins. As the evaporator warms, the thermistor located on the suction line checks for a 9°C
temperature. When 9°C is reached, a 3.9 ksignal turns the harvest over to the adjustable
harvest timer which is factory set for normal conditions. The timer has settings of 60, 90, 120,
and 180 seconds (S1 dip switch 1 & 2). When the harvest timer completes its count down,
the harvest cycle is complete and the freeze cycle starts.
The minimum total time allowed by the board for a complete harvest cycle is 2 minutes.
HWV is open during harvest for a maximum of 6 minutes or the length of harvest minus 0,
10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter. LED 8 goes
off when HWV closes. PM energizes and runs for the last 0, 10, 30, or 50 seconds of harvest
depending on S1 dip switch 7 & 8 setting. LED 7 comes on when PM energizes. At the end
of harvest, the control board checks the position of LF/S and proceeds to the freeze cycle if
it is closed or calls for a 1-minute fill if it is open.
[c] FREEZE CYCLE
LEDs 5 & 7 are on. Comp continues to run, PM and FMS energize, HGV closes and the
freeze cycle starts. For the first 5 minutes after the thermistor temperature reaches 2°C, the
control board will not accept a signal from LF/S and UF/S. This minimum freeze period acts
as a short cycle protection. At the end of this period, LF/S and UF/S assumes control. As ice
builds on the evaporator the water level in the sump lowers and LF/S opens, FWV opens
(LED 9 is on when FWV is open). The refill will last until UF/S closes or for 60 seconds,
whichever is shorter. After UF/S closes, FWV closes 3 seconds later. KMD-201/270 refills 1
time. After the refill, the freeze continues until LF/S opens again and terminates ice
production.
[d] DRAIN CYCLE
LEDs 4, 5, 6, and 7 are on. Comp continues to run, HGV opens, FMS de-energizes. PM
stops for 2 seconds, DV energizes, then restarts to take water from the sump and force it
through DV and down the drain. When the drain timer stops counting, the drain is complete.
The drain timer is 10 or 20 seconds (S1 dip switch 3 & 4). Drain cycle always occurs on the
2nd harvest after startup. Then, depending on the control board setting, drain cycle occurs
every cycle, or every 2nd, 5th, or 10th cycles (S1 dip switch 5 & 6).

10
[e] NORMAL HARVEST CYCLE
LEDs 5, 6, and 8 are on. Comp continues to run, HGV remains open and HWV opens. As
the evaporator warms, the thermistor reaches 9°C. The control board then receives the
thermistor’s 3.9ksignal and starts the harvest timer. HWV is open during harvest for a
maximum of 6 minutes or the length of harvest minus 0, 10, 30, or 50 seconds (adjustable
by S1 dip switch 7 & 8), whichever is shorter. LED 8 goes off when HWV closes. PM
energizes and runs for the last 0, 10, 30, or 50 seconds of harvest depending on S1 dip
switch 7 & 8 setting. LED 7 comes on when PM energizes. At the end of harvest, the control
board checks for the position of LF/S and proceeds to the freeze cycle if it is closed or calls
for a 1-minute fill if it is open.
The unit continues to cycle through [c], [d], and [e] sequence until the bin control is activated
and shuts the unit down. When the bin control is activated, the “POWER OK” LED flashes.
Note: To prevent incomplete batches of ice from foaming on the evaporator, the control
board will only shut down the machine within the first 5 minutes of the freeze cycle
after the thermistor temperature reaches 2°C. If ice pushes the bin control actuator in
(open) after this minimum freeze period, the control board will allow the machine to
complete the freeze cycle and the following harvest cycle before shutting down the
machine.
Legend: Comp–compressor; DV–drain valve; FMS–self-contained fan motor; FWV–fill
water valve; HGV–hot gas valve; HWV–harvest water valve; LF/S–lower float
switch contacts; UF/S–upper float switch contacts; PM–pump motor

11
KMD-201/270AA, 201/270AWA
“H” board will have
5 second delay
·Maximum harvest water valve time: 6 minutes (HWV time is 6 minutes of the length of harvest minus 0, 10, 30, or 50 sec. (S1 dip switch 7 & 8), whichever is shorter. PM energizes and runs for the last 0, 10, 30, or 50 sec. of harvest.) ·Maximum harvest time: 20 minutes
·Minimum freeze time: 5 minutes ·Maximum freeze time: freeze time setting ·Lower float switch used to initiate water Tank refill (1 refill for KMD-270) ·Upper float switch used to terminate water tank refill (1 minute maximum fill time)
Factory set for every 10
th
cycle (S1 dip
Switch 5 & 6) Pump motor stops for 2 sec. and then runs for 10/20 sec. (S1 dip switch 3 & 4)
0, 0,30, or 50 sec
HWV energized
COMP energized HGV energized HWV continues FWV de-energized DV de-energized
COMP continues PM continues FWV energized/ de-energized for refill only FMS energized HGV de-energized
PM de-energizes 0/2 sec., energizes for 10/20 sec. COMP continues DV energized/ HGV energized FMS de-energized
Legend: COMP - compressor DV – drain valve FMS – self-contained fan motor FWV – fill water valve HGV – hot gas valve HWV – harvest water valve LF/S – lower float switch contacts PM – pump motor UF/S – upper float switch contacts
4. Drain Cycle

12
3. CONTROL BOARD
* A HOSHIZAKI exclusive solid-state control is employed in KMD-201/270AA and
KMD-201/270AWA Crescent Cubers.
* All models are pretested and factory-adjusted.
CAUTION
1. Fragile, handle very carefully.
2. A control board contains integrated circuits, which are susceptible to failure
due to static discharge. It is especially important to touch the metal part of the unit
when handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the board to
prevent damage to the board.
4. Do not change wiring and connections.
5. Always replace the whole board assembly if it goes bad.
6. Do not short out power supply to test for voltage.

13
[a] CONTROL BOARD LAYOUT
#4 Harvest Water Valve
#5 Freeze Water Valve
#1, 2, 3 Float Switch
P01771-02
Control Board
Model KMD-201AA/AWA KMD-270AA/AWA
Auxiliary Code V1 or Earlier V2 or Later V1 or Later
Part Number P00013-02 P01771-02 P01771-02
Type HKM2006V003

14
[b] FEATURES
a) Maximum Water Supply Period - 6 minutes
The harvest water valve will be open during harvest for 6 minutes or the length of harvest
minus 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter.
b) Harvest Backup Timer and Freeze Timer
The harvest backup timer shuts down the icemaker if, for two cycles in a row, the harvest
cycle takes more than 20 minutes to complete. The control board will signal this problem
using 2 beeps every 3 seconds.
The freeze timer shuts down the icemaker if, for two cycles in a row, the freeze cycle takes
longer than the time specified to complete. The control board will signal this problem using 3
beeps every 3 seconds. The time is factory set using S1 dip switch 9 & 10.
The alarm reset button on the control board must be pressed with power on to reset either of
these safeties.
c) High Temperature Safety
The temperature of the suction line in the refrigeration circuit is limited by the high
temperature safety. This protects the unit from excessively high temperatures. If the
evaporator temperature rises above 53°C ± 4°C, the thermistor operates the safety.
This shuts down the circuit and the icemaker automatically stops.
The control board will signal this problem using 1 beep every 3 seconds. The alarm reset
button on the control board must be pressed with power on to reset the safety.
d) Low Water Safety
The control board checks the position of the lower float switch at the end of the initial one
minute water fill cycle and at the end of each harvest cycle.
If the lower float switch is in the up position (electrical circuit closed), the control board
changes to the next cycle. If the lower float switch is in the down position (electrical circuit
open), the control board changes to additional one minute water fill cycles until water enters
the sump and the float switch closes. When the float switch closes, the control board
changes to the next cycle. The unit will not start without adequate water in the sump. This
serves as a low water safety to protect the water pump.
For water-cooled model, if the condenser water supply is shut off, the unit is protected by the
high-pressure switch.
e) High Voltage and Low Voltage Cut-outs
The maximum and minimum allowable supply voltages of this icemaker are limited by the
high voltage and low voltage cut-outs.
If miswiring (especially on single 3 phase wire models) causes excessive voltage (294 Vac ±
5% or more) on the control board, the high voltage cut-out shuts down the circuit in 3
seconds and the icemaker automatically stops. The control board will signal this problem
using 7 beeps every 3 seconds.
The icemaker also automatically stops in cases of insufficient voltage (184Vac ± 5% or less).
The control board will signal this problem using 6 beeps every 3 seconds.
When the proper supply voltage is resumed, the icemaker automatically starts running
again.

15
f) LED Lights and Audible Alarm Safeties
The control board includes LED indicator lights, audible alarm safeties, and an output test
feature. The "POWER OK" LED indicates control voltage and will remain on unless a control
voltage problem occurs. The “POWER OK” LED flashes continuously when the bin is full
and DV energizes for a maximum of 5 minutes to drain the water tank.
At startup, a 5 second delay occurs to stabilize the circuit. LEDs 4 through 8 energize and
sequence from initial startup as listed in the table below. Note that the order of the LEDs
from the outer edge of the board is 5, 6, 8, 9, 4, 7. For more information, see "2.
SEQUENCE OF OPERATION".
Time LEDs are On
Sequence Step LED Energized
Components Min. Max. Avg.
1 Minute Fill Cycle 8 HWV 60 sec
Harvest Cycle 5, 6, 8 WV, HGV,
Comp 2 min. 20 min. 3 to 5 min.
Last 0, 10, 30, or 50 seconds (adjustable by dip switch) of harvest, WV de-energizes and PM
energizes (LEDs 5, 6, and 7 are on)
Freeze Cycle 5, 7 (and
9 at refill)
Comp, PM, FMS
(FWV at refill) 5 min. freeze timer setting 25 to 30 min.
Drain 5, 6, 4, 7 Comp, HGV,
DV, PM 10 sec. 20 sec. factory default setting
The built in safeties shut down the unit and have alarms as listed below.
No. of Beeps
(every 3 sec.)Type of AlarmNotes
1High Evaporator Temp.
(temperature > 127°F (53°C))
Check for harvest problem (stuck HGV or relay), hot
water entering unit, stuck HM, or shorted thermistor.
2
Harvest Backup Timer
(harvest > 20 min. for two
cycles in a row)
Check for open thermistor, HGV not opening, TXV
leaking by, low charge, inefficient Comp, or WRV
leaking by.
3
Freeze Timer
(freeze > specified setting for
two cycles in a row)
Timer is factory set using S1 dip
switch 9 & 10
Check for a float switch stuck closed (up), WV
leaking by, HGV leaking by, PM not pumping, TXV
not feeding properly, low charge, or inefficient
Comp.
To reset the above safeties, press the “ALARM RESET” button with the power supply on.
6Low Voltage
(184Vac ± 5% or less)
7High Voltage
(294Vac ± 5% or more)
“POWER OK” LED will turn off if voltage protection
operates.
The control voltage safeties automatically reset
when voltage is corrected.
Legend: Comp–compressor; DV–drain valve; FMS–self-contained fan motor; FVW–fill
water valve; HGV–hot gas valve; HM–headmaster; HWV–harvest water valve;
WRV–water regulating valve; PM–pump motor; TXV–thermostatic expansion valve

16
[c] CONTROLS AND ADJUSTMENTS
a) Default Dip Switch Settings
The dip switch is factory-adjusted to the following positions:
S1 Dip Switch No. 1 2 3 4 5 6 7 8 9 10
KMD-201AA (50Hz) OFF OFF OFF OFF ON ON ON ON ON OFF
KMD-201AA (60Hz) OFF OFF OFF OFF ON ON ON ON OFF OFF
KMD-201AWA (50Hz) OFF OFF OFF OFF ON ON ON ON OFF OFF
KMD-201AWA (60Hz) OFF OFF OFF OFF ON ON ON ON ON OFF
KMD-270AA (50Hz) OFF OFF OFF ON ON ON ON ON OFF OFF
KMD-270AA (60Hz) OFF OFF OFF ON ON ON ON ON OFF OFF
KMD-270AWA (50Hz) OFF OFF OFF ON ON ON ON ON OFF OFF
KMD-270AWA (60Hz) OFF OFF OFF ON ON ON ON ON ON OFF
S2DipSwitch
* Functions of S2 dip switch nos. 2
through 6 depend on program version.
Control
Board
Auxiliary
Code
Program
Ver. S2 Dip Switch No. 1 2 3 4 5 6
KMD-201AA (50Hz) ON OFF ON OFF OFF ON
KMD-201AA (60Hz) ON OFF ON OFF OFF ON
KMD-201AWA (50Hz) ON OFF ON OFF OFF ON
P00013
-02
V1 or
earlier
2.5 or
earlier
KMD-201AWA (60Hz) ON OFF ON OFF OFF ON
KMD-201AA (50Hz) ON ON ON OFF OFF ON
KMD-201AA (60Hz) ON ON ON OFF OFF ON
KMD-201AWA (50Hz) ON ON ON OFF OFF ON
3.1
KMD-201AWA (60Hz) ON ON ON OFF OFF ON
KMD-201AA (50Hz) ON ON ON OFF OFF OFF
KMD-201AA (60Hz) ON ON ON OFF OFF OFF
KMD-201AWA (50Hz) ON ON ON OFF OFF OFF
V2 or
later
3.2
KMD-201AWA (60Hz) ON ON ON OFF OFF OFF
V1 3.1 KMD-270AA (50Hz) ON OFF ON ON ON OFF*1
V2 3.2 KMD-270AA (50Hz) ON OFF ON ON ON ON*1
KMD-270AA (50Hz) ON OFF ON ON ON OFF*2
KMD-270AA (60Hz) ON OFF ON ON ON OFF*2
KMD-270AWA (50Hz) ON OFF ON ON ON OFF*2
P01771
-02
A0 or
later 3.2
KMD-270AWA (60Hz) ON OFF ON ON ON OFF*2
*1 Anti-Slush Control (Ver. 2.0) – Change to *2 control if too much white ice is produced
(auxiliary code V2 only).
*2 Anti-Slush Control (Ver. 1.1) – Control to reduce white ice has been added. See “II. 3. [c]
m) Anti-Slush Control” and “III. 3. TIMING CHART” for details.

17
Do not adjust the S2 dip switch. These must be left in the factory default position, or the unit
will not operate properly.
b) Harvest Timer (S1 dip switch 1 & 2)
Used for adjustment of the harvest timer. The harvest timer starts counting when the
thermistor reads a certain temperature at the evaporator outlet.
Dip Switch Setting
No. 1 No. 2 Time (seconds)
OFF OFF 60
ON OFF 90
OFF ON 120
ON ON 180
c) Drain Timer (S1 dip switch 3 & 4)
Once every ten freeze cycles, the drain valve opens to drain the water tank for the time
determined by the drain timer. These switches also determine the time to delay completion
of a harvest cycle, i.e. the minimum harvest time.
Do not change this setting, or the unit will not operate properly or produce high quality ice.
Dip Switch Setting Time (seconds)
No. 3 No. 4 T1 T2
OFF OFF 10 120
ON OFF 10 180
OFF ON 20 120
ON ON 20 180
T1: Time to drain the water tank
T2: Harvest timer at drain
Drain cycle always occurs on the 2nd harvest after startup. Then, depending on the drain
frequency control setting (dip switch 5 & 6), drain cycle occurs every cycle, or every 2nd, 5th,
or 10th cycle.
d) Drain Frequency Control (S1 dip switch 5 & 6)
The water tank drains at the frequency set by the drain frequency control.
The drain frequency control 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
drain more often, the drain frequency can be adjusted as shown in the table below.
Dip Switch Setting
No. 5 No. 6 Frequency
OFF OFF Every cycle
ON OFF Every 2 cycles
OFF ON Every 5 cycles
ON ON Every 10 cycles