MV 306-456-606-806-1006 - Scotsman

MV SERIES 

CUBERS 

TECHNICAL SERVICE TRAINING 

Welcome to another Scotsman technical service presentation. This 

one will cover the NEW MV Series Modular Ice Cube Machines 

models MV 306, MV 456 , MV 606, MV 806 and MV 1006.

MV 306-456 

456-606-806-1006 

TOPICS 

On the next slides are shown the following steps by steps 

procedures: 

• UNPACKING 

• INSTALLATION 

• START UP AND OPERATIONAL CHECKS 

• OPERATING PRINCIPLES and COMPONENTS 

• MAINTENANCE 

• SERVICE ANALYSIS



UNPACKING



UNPACKING 

The machines are 

supplied in a carton box 

secured by two plastic 

strips to a wooden base. 

Check first the outside 

conditions of carton box 

and wooden base then cut 

the two plastic strips, 

remove the tape and then 

the carton box. MV 306



UNPACKING 


606-806-1006



Visually inspect the 

exterior of the machine 

then remove the front 

panel…. ……… 

UNPACKING 

……..and 

the two 

side 

panels …..



Remove the 

water inlet 

and outlet 

hoses as well 

as…….. 

UNPACKING



UNPACKING 

……….the air 

baffle on the 

air cooled 

version.



UNPACKING 

Unscrew the 

unit frame 

from the 

wooden 

base….



UNPACKING 

The Modular Cuber machines 

require for the installation the use of 

a companion storage bin to store the 

ice produced. 

Storage bins required are: 

• B 193 for MV 306 

• B 393 for MV 456-606-806- 

1006 

B 193



UNPACKING 

Unpack the 

storage bin and 

visually inspect 

the exterior then 

remove from 

the inside the 

carton box 

containing the 

legs as well as 

the drain hose 

and the plastic 

scoop.



INSTALLATION



INSTALLATION 

On B 193/393 

Storage Bin 

install the four 

legs and their 

adjusting 

leveling nuts on 

the bottom base.



INSTALLATION 

Place the 

storage bin in its 

definitive 

location then 

install on top of 

its upper side 

the rubber 

gasket then….



INSTALLATION 

…...install on top of 

the same the ice 

machine and secure 

it with the two 

screws.



INSTALLATION 

Remove the 

plastic tape 

securing the 

plastic cover 

to the vertical 

evaporator 

then….



INSTALLATION 

…..push the 

right side of 

the front 

plastic cover...



INSTALLATION 

…..and take it 

out.



INSTALLATION 

Take out the 

adhesive tape 

holding the 

Ice Thickness 

Sensor to the 

front cells of 

the evaporator 

then re-install 

the plastic 

cover.



On air cooled 

version 

unloose a little 

bit the three 

screws 

securing the 

air cooled 

condenser to 

the unit 

frame…. 

INSTALLATION



INSTALLATION 

…. and install 

the metal plate 

(air baffle) on 

the back side 

of the 

machine so….



INSTALLATION 

…. to 

minimize the 

possible 

recycling of 

hot air 

through the 

left side 

lowered panel.



INSTALLATION 

The installation of the 

metal plate (air 

separator) grants also a 

minimum distance 

between the back side of 

the machine and the wall 

so to assure a correct and 

adequate ventilation. 

TOP VIEW 

MINIMUM 

DISTANCE



Check the data 

plate of the 

machine located on 

the rear panel for 

correct voltage as 

well as for the 

proper wiring/fuse 

size. 

Remember that all 

machines require a 

solid earth wire. 

INSTALLATION



INSTALLATION 

Check for the correct water and ambient conditions that should be: 

• Min. ambient temperature 

• Max. ambient temperature 

• Min. water temperature 

• Max. water temperature 

• Min. water pressure 

• Max. water pressure 

10ºC (50F) 

40ºC (100F) 

5ºC (40F) 

35ºC (90F) 

1 bar (14 PSI) 

5 bar (70 PSI)



INSTALLATION 

Adequate 

space must left 

for proper 

water and 

electrical 

connections on 

the rear side of 

the machine 

and a 

minimum 

clearance of 15 

cm on right 

side for best 

routing air. 

Min. space 15 cm

MV 306 

INSTALLATION - AIR CIRCULATION 

COLD AIR 

FAN MOTOR 

CONDENSER 

HOT AIR 

COMPRESSOR 

EVAPORATOR 

ICE CHUTE 

OPENING


606-806-1006 

INSTALLATION - AIR CIRCULATION 

FAN MOTOR 

COLD AIR 

CONDENSER 

HOT AIR 

COMPRESSOR 

EVAPORATOR 

ICE CHUTE 

OPENING



INSTALLATION 

Level the unit 

on both 

directions front 

to rear and 

right to left 

side using the 

adjustable 

legs.



INSTALLATION - ELECTRICAL 

Install, on the cable supply 

with the machine, an 

adaguate electrical plug 

according to the local 

standards and regulations. 

Maximum voltage variation 

should be ±10%. 

Machine must be 

individually fuse protected.



INSTALLATION - WATER IN 

Connect the water inlet 3/4” 

male threat of the water inlet 

fitting to the water supply line 

by means of the rubber hose 

provided with machine. 

Install on water supply line 

closed to the machine a water 

valve (tap).



INSTALLATION - WATER DRAIN 

Connect the 20 

mm O.D. fitting 

of the water drain 

with the flexible 

hose supply with 

the machine with 

its proper clamp. 

As water will be 

mainly drained 

under pressure 

(by water pump) 

it is not necessary 

to have a vented 

drain.



TYPICAL INSTALLATION 

AIR COOLED 

POWER 

HAND DISCONNECT 

SWITCH 

WATER INLET 

WATER 

VALVE 

WATER DRAIN 

WATER 

FILTER 

WATER DRAIN



TYPICAL INSTALLATION 

WATER COOLED 

POWER 

HAND DISCONNECT 

SWITCH 

WATER INLET 

WATER 

VALVE 

WATER DRAIN 

WATER 

FILTER 

WATER DRAIN



START UP AND 

OPERATIONAL 

CHECKS



START UP AND OPERATIONAL CHECKS 

• Open the 

water 

tap/valve.




• Switch ON the 

power on the 

electrical supply 

line.



The machine enter in the 

Start Up mode with the 

PC Board energized as 

well as the Green LED 

of the machine under 

power. 

The Green LED 

machine in operation is 

energized too, blinking 

fast for 40 seconds. 

of 

START UP



START UP 

During the Start Up cycle the 

components in operation are: 

• Hot gas valve



START UP 

During the Start 

Up cycle the 

components in 

operation are: 

• Hot gas valve 

• Water Drain 

Valve



START UP 

During the Start Up 

cycle the components 

in operation are: 


• Water Drain Valve 

• Harvest assist 

solenoid



START UP 

During the Start Up 

cycle the components 

in operation are: 


• Water Drain Valve 


solenoid 

• Water pump



START UP 

Start up cycle resuming chart 

Compressor 

Water Water inlet inlet valve valve 

Water Water pump pump 

Hot Hot gas gas valve valve 

Water Water drain drain valve valve 

Harvest assist assist sol. sol. 

0 40'' 40''



After the Start Up cycle the 

machine enters directly into the 

Freezing cycle with the 

following components 

energized: 

• Water Inlet Valve 

FREEZING CYCLE




• Compressor 

FREEZING CYCLE





• Fan motor (in continuous 

operation for the first 3 

minutes) 

FREEZING CYCLE



The LED energized are: 

• Machine under power 

FREEZING CYCLE 

• Machine in operation (steady) 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET




Water, coming 

through the Water 

Inlet Solenoid 

Valve....




…..fill up the 

water reservoir...



….till the maximum level…. 

FREEZING CYCLE




….controlled by the 

shortest metal pin of the 

Water Level Sensor.




30 seconds later, 

the Water Pump 

starts up.



In the meantime 

the condenser 

sensor starts to 

transmit the current 

to the PC 

Board….. 

FREEZING CYCLE



…. keeping in 

operation the Fan 

Motor in ON-OFF 

mode according to 

the condenser 

temperature. 

FREEZING CYCLE




The machine remains in 

the freezing cycle with the 

ice that become thicker ….



……till the two 

metal plates of 

the Ice 

Thickness 

Sensor are 

covered by the 

water cascading 

down through 

the front surface 

of the ice plate. 

FREEZING CYCLE



When the 

Power is 

transmitted back 

continuously to 

the PC Board 

through the 


the Ice 

Thickness 

Sensor for more 

then 6 seconds, 

the…. 

FREEZING CYCLE




….machine enters in the Pre-Harvest first or directly into the 

Harvest Cycle mode according to: 

FAN MOTOR IN ON-OFF MODE 

DURING THE PREVIOUS 


RISE UP THE CUT IN 

TEMPERATURE OF THE 

CONDENSER SENSOR TO 38°C AND 

EXTEND THE LENGTH OF 

FREEZING CYCLE BY 30" MORE 

THEN GO INTO HARVEST CYCLE 

FAN MOTOR ALWAYS IN ON 

MODE DURING THE PREVIOUS 


GO STRAIGHT TO THE HARVEST 

CYCLE 

FAN MOTOR OFF




Freezing cycle resuming chart 

Compressor 

Water Water inlet inlet valve valve 

Water Water pump pump 30" 30" 

Fan Fan motor motor < 30°C 30°C 3' 3' 

30" 30" 

Fan Fan motor motor > 30°C 30°C 

0 20' 20'



WATER SYSTEM - FREEZE



During the harvest cycle the 

components in operation are: 

• Hot Gas valve 

HARVEST CYCLE




•Water 

Drain/Purge 

Valve 

HARVEST CYCLE




•Water 

Drain/Purge 

Valve 


solenoid 

HARVEST CYCLE




•Water 

Drain/Purge Valve 


solenoid 

•Water Pump for 

the first 6” 

HARVEST CYCLE




• Water Drain/Purge Valve 

• Harvest assist solenoid 

•Water Pump for the first 6” 


HARVEST CYCLE




HARVEST CYCLE 

• Water Drain/Purge Valve 

• Harvest assist solenoid 

• Water Pump for the first 40” 


and both LEDs 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET 

• Machine Under Power 

• Machine in Operation



HARVEST CYCLE 

The Fan Motor remains 

in OFF mode unless the 

Condenser Sensor 

probe rises up to more 

then 38°C (same set up 

as per end of freezing 

cycle).




While the ice plate is 

falling down, it moves 

the front plastic cover 

out from the evaporator 

causing the activation 

of the magnetic switch 

to restart a new 

freezing cycle.



HARVEST CYCLE 

Harvest cycle resuming chart 

Compressor 

Water inlet valve 

Water pump 6" 

Hot gas valve 

Water drain valve 

Harvest assist sol. 

0 END HARVEST CYCLE



WATER SYSTEM - HARVEST 

1ST PART - 6” 

ON




2ND PART - TO THE END OF HARVEST CYCLE 

OFF



OPERATING PRINCIPLES - BIN FULL 

When the last ice plate 

discharged from the 

evaporator doesn’t find 

any more space into the 

storage bin it remains in 

between the storage bin 

and the machine 

keeping…...




…….the plastic 

deflector/cover in open 

position.




By doing so the magnet is 

kept far from its switch for 

more then few seconds that 

it is equivalent to transmit 

the signal to the PC Board 

of Bin Full.



In case the magnetic sensor remains open, during freezing or 

harvest cycle, for more then 30 seconds, the machine stops its 

operation in Bin Full with the glowing of the BIN FULL 

YELLOW LED. 

BIN FULL 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET



Both the last two Red 

LED are ON steady: 

ALARM CONDITIONS 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET




Both the last two 

Red LED are ON 

STEADY: 

Condenser Sensor 

OUT OF ORDER




LED are BLINKING 

SLOW: 

WATER ERROR 


POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET






SLOW: 

WATER ERROR 

Water level inside the 

water sump too low 

after 3 minutes from 

the activation of the 

Water Inlet Valve. 

CORRECT 

WATER LEVEL 

TOO LOW 

WATER LEVEL





FAST: 


POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET






FAST: 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET 

RESET MODE 

Charging water through 

the Water Inlet Solenoid 

Valve after the tripping 

OFF on WATER ERROR




The fourth Red LED is 

BLINKING SLOW: 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET





BLINKING SLOW: 

TOO HI 

CONDENSING 

TEMPERATURE 

The condenser sensor 

detected a temperature 

80 

70 

60 

50 

40 

30 

20 

10 

0 

> 65°C





BLINKING FAST: 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET 

RESET MODE 

Condenser Sensor < 50°C 

Fan motor in operation for 3 

minutes then back on Start 

Up Cycle Mode.





ON STEADY: 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET





ON STEADY: 

Too long Harvest Cycle > 3’ 30” 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET




The fifth Red LED is 

ON STEADY: 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET





ON STEADY: 

TOO HI DISCHARGE 

PRESSURE > 33 bar 460 PSI 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET






RESET MODE 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET 

Push the Reset Button of the 

Pressure Control…..






RESET MODE 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET 

First the fan motor starts up 

for 3 minutes then…... the 

entire machine through the 

Start Up Cycle Mode.




The PC Board is also checking the maximum time of the freezing 

cycle that changes according to the operation of the fan motor 

during the freezing cycle (room temperature): 

• Fan motor in ON-OFF OFF mode: 

• Fan motor ON all the time: 

Max. freezing cycle length 

equal to 30 minutes 

Max. freezing cycle length 

equal to 40 minutes




Whenever the machine remains in the 

Freezing Cycle for the Maximum time (30 

or 40 minutes), the PC Board moves the 

unit directly into the Harvest Cycle.




In case the Harvest Cycle takes longer 

then 3’ 30”, the machine trips OFF with 

the glowing of the fourth Red LED. 

POWER 

OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET




To Restart the 

machine it is 

necessary to Push 

the RE-SET 

BUTTON



In case the Water Level Sensor 


does NOT detect any presence of 

water, after the first 3 minutes of 

operation in the freezing cycle, 

the P C Board switches OFF the 

entire machine with the SLOW 

BLINKING of the last two RED 

LEDs (WATER ERROR). 

POWER OPER. 

BIN 

FULL 

ALARM 

ALARM 

HI 

PRESS. 

RE-SET




WATER ERROR: 

The machine remains in OFF mode for 30’ then it tries to re-fill 

water: Water re-filled? 

YES: 

Machine remains in operation 

NO: Machine again in OFF mode for additional 30’




The components energized at 

beginning of the freezing cycle 

are: 

• PC Board






are: 

• PC Board 

• Contactor






are: 

• PC Board 

• Contactor 

• Compressor




Few seconds later, as soon 

as the discharge pressure 

reaches 17 bar (240 PSI), 

the fan motor starts to 

operate in ON-OFF mode 

keeping the discharge 

pressure between 15 and 

17 bar (210÷240 PSI).




The operation of the 

fan motor is 

controlled by a 

condenser 

temperature sensor 

located on the 

outlet of condenser 

that transmit a 

signal to the PC 

Board to activate in 

ON-OFF mode the 

fan motor.




The Water Pump 

starts up 30 

seconds later so to 

allow the evaporator 

to freeze up its outside 

surface and reduce as 

much as possible the 

slush formation.




While the water 

is falling dawn 

from the upper 

side of the 

evaporator it 

enter into the 

refrigerated 

cells starting the 

formation of a 

small layer of 

ice.




The machine remains in 

the freezing cycle with the 

ice that become thicker ….




……till the two 


the Ice 

Thickness 

Sensor are 

covered by the 

water falling 

dawn through 

the front surface 

of the ice plate.




By doing so a 

low voltage 

current is 

supply back to 

the PC Board 

using water as a 

conductor.




10 seconds later the PC 

Board put the machine 

in the harvest cycle 

energizing the: 

• Hot Gas Valve




10 seconds later 

the PC Board put 

the machine in 

the harvest cycle 


• Hot Gas Valve 

• Water drain 

Valve



10 seconds later 

the PC Board put 

the machine in 

the harvest cycle 


HARVEST CYCLE 

• Hot Gas Valve 

• Water drain 

Valve 

•Harvest 

Assist Valve




The other electrical 

components that 

remain energized 

during the harvest 

cycle are: 

• Compressor




……….and for the 

first 6’’ only the 

•Water Pump




The refrigerant in hot 

gas state, pumped by 

compressor, reaches the 

back side of the 

evaporator warming up 

its surface and partially 

melting the ice.




After one-one and 

half minute from the 

beginning of the 

harvest cycle, the ice 

plate is moving out 

from the evaporator 

cells….




….falling down into the 

bottom storage bin.




In the meantime also 

the water drain valve 

and the water pump 

are energized 

pumping out the 

water from the sump 

for the first 6” so to 

reduce as much as 

possible the 

accumulation of scale 

into the water system.



OPERATING 

PRINCIPLES 

and 

COMPONENTS

Compressor 



OPERATING PRINCIPLES - FREEZE 

Evaporator 

Hot 

gas 

valve 

Air cooled 

condenser

Compressor 



OPERATING PRINCIPLES - HARVEST 

Evaporator 

Hot 

gas 

valve 

Air cooled 

condenser



WATER SYSTEM - FREEZE




1ST PART - FIRST 6” - WATER PURGE OUT




2ND PART - UP TO THE END OF HARVEST 

OFF



COMPONENTS - REFRIGERANT SYSTEM 

LOCATION OF REFRIGERANT COMPONENTS 

The components of the refrigerant 

system of the MV series Models are 

composed by: 

• COMPRESSOR







composed by: 

• COMPRESSOR 

• CONDENSER







composed by: 


• CONDENSER 

• EVAPORATOR







composed by: 


• CONDENSER 

• EVAPORATOR 

• TXV VALVE







composed by: 


• CONDENSER 


• TXV VALVE 

• HEAT EXCHANGER







composed by: 


• CONDENSER 


• TXV VALVE 

• HEAT EXCHANGER 

• DRIER







composed by: 


• CONDENSER 


• TXV VALVE 


• DRIER 

• HOT GAS VALVE







composed by: 


• CONDENSER 


• TXV VALVE 


• DRIER 

• HOT GAS VALVE 

• HIGH PRESSURE CTRL



COMPONENTS - WATER SYSTEM 

• WATER INLET VALVE




• WATER INLET VALVE 

• WATER SUMP




• WATER FLOAT VALVE 

• WATER SUMP 

• WATER PUMP




• WATER FLOAT VALVE 


• WATER PUMP 

• WATER DISTRIBUTOR 

PAN







• WATER DISTRIBUTOR PAN 

• WATER DRAIN VALVE







• WATER DISTRIBUTOR PAN 

• WATER DRAIN VALVE 

• HARVEST ASSIST 

SOLENOID



FAN 

MOTORS 

PC BOARD 

COMPRESSOR, HOT GAS, WATER 

INLET AND DRAIN VALVES 

POWER IN 

AND SAFETY 

PRESSURE 

CONTROLS 

FUSE 

WATER 

PUMP 

N.O. - JUMP OUT 

AUTOMATIC 

N.C. - JUMP IN 

MANUAL 

- + 

J2 

WATER 

SENSITIVITY 

ADJUSTMENT 

J1 

FOR 

FACTORY 

USE ONLY 

SERIAL 

CONNECTOR 

DISPLAY 

CONNECTOR 

ICE THICKNESS 

SENSOR 

WATER LEVEL 

SENSOR 

MAGNETIC 

SWITCH 

CONDENSER 

SENSOR



The PC Board can be 

set up for: 

Manual reset and 

one water filling at 

beginning of the 

Freezing Cycle 

(JUMP IN) 

SETTING OF PC BAORD



The PC Board can be 

set up for: 

Automatic reset 

and continuous 

water filling mode 

during the Freezing 

Cycle (JUMP OUT) 

SETTING OF PC BAORD



COMPONENTS - ELECTRONIC CONTROLS 

The components of the 

Electronic System of the 

MV Series Models are 

composed by: 

• PC BOARD


• PC BOARD 

• ICE 



THICKNESS 

SENSOR




• PC BOARD 

• ICE THICKNESS 

SENSOR 

• CONDENSER 

SENSOR




• PC BOARD 

• ICE THICKNESS 

SENSOR 

• CONDENSER 

SENSOR 

• MAGNETIC 

SWITCH

END FIRST 

HALF

MV 306-456-606-806-1006 - Scotsman

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