Hoshizaki Ice Maker IM 500SAA User Manual

AM SERVICE TRAINING

Featuring the

IM-500SAA

80047

9/10/13

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The ABS water plate sprays water up

into the evaporator cells to form the

square IM cube.

The moveable water pan assembly

includes the water plate, reservoir

pan, and pump motor assembly.

Tension springs connect two cam

arms to the water plate assembly. An

actuator motor rotates the cam arms

to raise and lower the water pan

during the ice making cycle.

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The horizontal evaporator and water

distribution system are unique to the

Hoshizaki IM series. The IM-500 makes

ice on a horizontal evaporator and uses

R-404a refrigerant.

The IM-500SSA sequence of operation

will be explained in the following pages.

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The

IM-500SAA

unit uses

Thermistor

combination thermistor and control

board to control the sequence of

operation.

SOFT START:

When the toggle switch is placed in the

“ON” position and the bin control calls

for ice, the unit will begin in the soft

start the display will say “on” and the

hot gas valve will open after 30 seconds

the initial harvest cycle begins,(if the

reset switch is pressed during the 30 sec.

standby time the unit will skip soft start

and immediately starts operation).

Starting the unit in harvest allows the

compressor to start up in basically an

unloaded condition, greatly extending

the life of the compressor.

This

operation is common among all

Hoshizaki cube icemakers.

WATER PAN OPENS/HARVEST:

During the initial harvest, the

compressor, hot gas valve and the

actuator motor starts to open, after 20

seconds the water valve will energize to

supply defrosting water for a specified

time. (The time varies depending on the

incoming water temperature above or

below 48ºF(9ºC) also in initial cycle the

water temp. is not detected and

assumed to be below 48ºF (9ºC)

resulting in a longer defrosting water

supply time.

The opening backup timer starts

counting when the water pan starts to

open if the hall IC (magnetic switch)

does not turn on within 3 min. the

display will show “EE” and the unit

stops for 60 minutes, if it reoccurs after

the unit resumes display will show “EE”

and the unit shuts down and (records as

“E3” in the error history.

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As soon as the pan starts to open the defrost

backup timer starts, if the thermistor mounted

on the evaporator does not reach the defrost

completion temperature before the timer times

out at 30 min. the display will show “E2” and

the unit stops. (if the HGV does not open this

could also give you an “E2” error)

The harvest cycle is controlled by thermistor

when the defrost completion temperature of

18.5º C or more is reached the HGV closes, the

fan motor starts, and the water pan starts

closing.

As before there is a timer that starts as soon as

the water pan starts to close. If the hall IC

(magnetic Switch) does not turn on within 3

min. the machine will stop and give a “EE”

error and the machine shuts down for 60

minutes if the error reoccurs after restart the

unit will shut down again and again shows

“EE” (recorded as ‘E4” in the error history).

NOTE: in the initial cycle or when the water is

below 48º F (9ºC), the water valve will open to

supply defrosting water for 10 second after the

water pan starts to close.

To check the resistance between thermistor

leads, follow the steps below.

1) Disconnect the connector CN13 on the

board.

2) Remove the screw and the thermistor holder

on the evaporator.

3) Immerse the sensor part in a glass containing

ice and water for 2 or 3 minutes.

4) Check the resistance between thermistor

Hall IC Switch is located on the

motor backside. (Magnetic Switch)

leads. Normal reading is within 5 to 7 kΩ

Replace the thermistor if it is

outside the normal reading.

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WATER PAN CLOSES/FREEZE:

When the water pan closes and the hall

IC turns on the water valve opens to

supply ice making water for a specific

time. The supply time varies between

startup, reset, and end of bin control

cycle between partial flush and full

drain.

NOTE Full drain flush: After a freeze

cycle ends the unit drains all remaining

water out of the tank and refills for the

next freeze cycle.

Partial drain flush: (default setting)

After a freeze cycle ends, the unit leaves

remaining water in tank and adds water

for the next cycle.

After water has been supplied the pump

motor starts, after 30 seconds the

thermistor senses the temperature that

will be added with a predetermined

offset value and used as the water

temperature for the freeze cycle, pan

opening, defrost, and pan closing cycle.

The freeze cycle is considered to be

100% complete when the predetermined

target and the integrated values are

reached. To reduce ice forming on the

water pan when the freeze completion

rate reaches 100% with an ambient

temperature below 86º F (30ºC), the hot

gas valve opens and closes two times to

raise the water pan temperature and the

actuator motor starts to open the water

pan. The freeze cycle is not considered

complete and the pump motor and fan

motor continue. The unit will continue

to cycle between freeze and harvest until

the bin control opens, signaling a full

bin or until power is interrupted

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The IM-500SAA uses a mechanical bin

control located on the right rear side of

the ice drop zone. This control will open

when ice pushes against the switch, if the

switch stays open for more than 10

seconds the machine will start the bin

control cycle, starts and the machine will

shut down after the next defrost cycle.

After the bin control stays closed for

more than 80 seconds the bin control

cycle will end and the machine will

restart.(the hot gas valve opens 30

seconds before the icemaker restarts)

After the bin control cycle ends (or when

the power supply is turned on), the water

pan starts to open.

When the water pan opens and the hall

IC turns on, the bin control cycle starts

after 10 seconds and the ice maker stops.

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The control switch is marked “ICE-

OFF-WASH” and is located on the upper

right front of the unit.

“OFF” – No power supplied to unit

“ICE” – Starts the automatic Ice making

process

“WASH” – Power is supplied to water

pump (this allows for cleaning and/or

sanitizing

“RESET”- If the reset is pushed after the

unit is turned to ICE the soft start is

skipped after 3 seconds the water pan

starts to open in the initial cycle.

If pressed and released during operation

(water pan opening or closing, defrost or

freeze cycle), the machine will return to

the initial cycle within 3 seconds and the

water pan starts opening.

If pressed and released while the

machine is in the off or bin control cycle

the machine will return to initial cycle

within 3 seconds the bin control cycle

ends and the water pan starts to open.

If pressed and released while machine is

in the off on an error the machine will

return to the initial cycle within 3

seconds, the error is reset and the water

pan starts to open.

NOTE: When the machine returns to the

initial cycle by the reset switch the water

temperature is assumed to be 32º F (0ºC)

[below 48º F (9º C), the freeze backup

timer is extended.

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CONTROL BOARD:

A solid state board controls the IM

operation. The control board is factory

adjusted to produce consistent ice in all

ambient conditions.

“NO SEASONAL

ADJUSTMENTS ARE

REQUIRED”

If it becomes necessary to install a new

IM-500SAA control board, part number

P01873-01, the model code must be

programmed into the board before the unit will

operate properly

Follow the steps below for programing:

1. Once the board has been installed, apply

power to the unit and turn the switch on.

2. “00” will appear on the display of the

new board

3. For the IM-500SAA, set the model code

to “08”

4. Press service button “1” to increase the

first digit and service button “2” to

increase the second. Note: It should

only be necessary to adjust service

button “2” in order to get the IM-

500SAA model code of “08” displayed.

5. Digits will appear in the following

order: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F.

6. When a valid model code is displayed,

the dot in the bottom right of the display

turns on.

7. When the desired model code “08” is

displayed, press the reset button to save

the setting. “ON” will appear in the

display.

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Preventative maintenance:

Follow these steps to allow the unit to

operate efficiently.

1. Clean the condenser once a year

using a brush or vacuum.

2. Check and clean the inlet water valve

screen as needed to assure proper

water flow.

3. Clean and sanitize the water

distribution system annually using the

recommended cleaner. (See below for

detailed information on cleaning the

water system)

4. Wipe down the exterior using a soft

cloth and neutral cleaner.

Cleaning tips:

 A detailed cleaning label is located on

the back of the ice maker front panel.

More detailed instructions are

included in the customers Instruction

Manual or in the product Service

Manual.

 Always follow the cleaning

instructions and use the

recommended ice machine cleaner.

Cleaning Label inside front

panel.

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1) Dilute approximately 7.2 fl. oz. (214

ml) of recommended cleaner Hoshizaki

“Scale Away” with 0.8 gal. (3.0 lit.) of

water.

2) Turn off the power supply.

3) Remove all ice from the storage bin.

4) Remove the front panel.

5) Remove the screw, and then move the

water tank drain pipe to the drain

position. See Fig. 5. Use the screw to

secure the water tank drain pipe in the

drain position.

6) Make sure the control switch is in the

“ICE” position, and then replace the

front panel.

7) Close the icemaker water supply line

shutoff valve.

8) Turn on the power supply for 3

minutes. The water tank drains and cubes

are removed from the evaporator.

9) Turn off the power supply.

10) Remove the front panel and top

panel.

11) Move the control switch to the

“WASH“ position.

12) Slowly pour the cleaning solution

over the top of the evaporator and into

the water tank. Do not splash or spill the

solution onto other parts.

13) Replace the front panel and top panel

in their correct positions.

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14) Turn on the power supply to start the

washing process.

15) Turn off the power supply after 30

minutes.

16) Open the icemaker water supply line

shut-off valve. See Fig. 4.

17) Remove the front panel.

18) Move the control switch to the "ICE"

position.

19) Replace the front panel.

20) Turn on the power supply for 3

minutes. The water tank drains.

21) Turn off the power supply.

22) Repeat steps 20 and 21 three more

times to rinse thoroughly.

SANITIZING:

¹⁾Dilute a 5.25% sodium hypochlorite

solution (chlorine bleach) with water

(add approximately 0.4 fl . oz. (12

ml) to 0.8 gal. (3.0 lit.) of water).

2) Close the icemaker water supply line

shut-off valve.

3) Turn on the power supply for 3

minutes. The water tank drains.

4) Turn off the power supply.

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5) Remove the front panel and top

panel.

6) Move the control switch to the

“WASH“ position.

7) Slowly pour the sanitizing solution

over the top of the evaporator and

into the water tank. Do not splash or

spill the solution onto other parts.

8) Replace the front panel and top panel

in their correct positions.

9) Turn on the power supply to start the

sanitizing process.

10) Turn off the power supply after 15

minutes.

11) Open the icemaker water supply line

shut-off valve.

12) Remove the front panel.

13) Move the control switch to the

“ICE“ position.

14) Replace the front panel.

15) Turn on the power supply for 3

minutes. The water tank drains.

16) Turn off the power supply.

17) Repeat steps 15 and 16 three more

times to rinse thoroughly.

18) Repeat steps 1 through 17 one more

time.

19) Remove the front panel.

20) Remove the screw, then move the

water tank drain pipe to the

normal position. See Fig. 5. Use

the screw to secure the water tank

drain pipe in the normal position.

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21) Replace the front panel.

22) Clean the storage bin liner using a

neutral cleaner. Rinse thoroughly

after cleaning.

23) Turn on the power supply to start the

automatic ice making process.

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Electrical Specifications:

The unit is 115 volt/ 60 hz./1ph.

The IM-500SAA should be connected to a separate 20 Amp circuit.

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IM SERIES REVIEW QUIZ

Choose the best answer for each question below.

1. The IM control board is located in the rear or the unit.

True

False

2. The IM unit uses a thermostatic bin control.

True

False

3. The bin control switch must OPEN or CLOSE to shut the unit down?

4. The IM series uses R-404A or R-134A refrigerant.

5. The IM-500SAA only uses one thermistor located on the evaporator?

True

False

6. The freeze cycle is temperature and time terminated.

True

False

7. On the initial freeze cycle the water valve will remain open for 30 seconds.

True

False

8. The water valve will remain energized for the entire harvest cycle regardless

of how long.

True

False

9. The IM-500SAA makes a square cube.

True

False

NOTE: Quiz answers are at the bottom of next page.

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NOTES:

Quiz answers:

1.False, 2. False 3. Open, 4. R-404A, 5. True, 6. True, 7. False, 8. False., 9. True

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