Hoshizaki AM-50BAE User Manual

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AM SERVICE TRAINING

Featuring the

AM-50BAE, AM-100BAE, AM-150BAF

AM-50BAE

AM-100BAE

 

AM-150BAF

 

 

 

 

80047

www.hoshizakiamerica.com

5-20-04

All AM models have similar sequence of operation. This manual is designed as a generic AM Training manual.

The Hoshizaki AM series ice machine uses a horizontal evaporator design which forms a unique cube shape.

20mm

25mm

The compact AM-50BAE unit is 14 7/8”w x 22 5/8”d x 33 1/2”h and is designed for counter-top, under-counter, or freestanding installations with up to 51 pounds of production and 30 pounds of storage

The AM-100 and AM-150 are for under counter or free standing applications.

The AM-100 dimensions are 24 15/16”w x 20 1/2”d x 39”h with 6” legs and can produce up to 105 and pounds with 44 pounds of storage.

The AM150 measures 27 11/16”w x 27 15/16”d x 39”h with 6” legs and production up to 150 pounds with 88 pounds of storage.

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WATER INLET CONNECTIONS 3/8” Male flare

4A3207-01

1/2” FPT

4A3240-01 DRAIN CONNECTIONS

5/8” I.D. rubber hose

(AM-50 through April 2004)

1/2” FPT

AM-50 from May 2004

3/4” MPT

(AM-100 & AM-150)

A standard 120-volt power cord provides the electrical connection. The unit is designed to operate on a separate 15-amp circuit.

Inlet Water Line Connection

1st production units had a 3/4" BSP connection directly to the inlet water valve. (DO not connect with 3/4" FIP)

Fitting (4A3207-01) and gasket 413854-01 were used from May through July production. (Through August on the AM-100BAE and AM150 BAF)

Fitting (4A3240-01) and gasket 413854-01 were added in August 03 on the AM-50BAE and September 03 on the AM-100BAE and AM150BAF.

If no fitting is included, order either fitting /gasket above or use 3/4" hose type fitting to make this connection.

A minimum 3/8” water line is required for proper operation.

Drain line connection

The drain connection for the AM-50 was 5/8” I.D. hose until April of 2004 and was located on the left rear of the unit. A standard 3/4” male insert fitting can be used to connect this drain. From May 2004 the drain fitting is 1/2” FPT. A minimum 1/2” I.D. vented drain is required when making this connection.

The drain for the AM-100 and AM-150 is a 3/4” MPT.

Since the unit will likely be enclosed, it is recommended to use flexible, supply and drain connections. This will allow easy removal if service is necessary.

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In the case of an AM-50 if a drain is not located in an area that will allow for the proper fall, there is an optional condensate pump available that can be installed directly into the unit. After removing the louvered rear panel the pump location is defined by the two metal tabs. This pump has a built in safety that will shut the AM-50 down in the event of a pump problem. This pump is available as an accessory through your local distributor. Simply follow the instructions included with the pump for details on the installation.

The AM-50 door can be field converted from the standard right hinged door to a left hinged door without the use of any additional hinge kits. The AM-100 and AM-150 use a spring loaded drop down door design therefore can not be reversed.

This procedure for reversing the AM-50 door is shown in the Instruction Manual provided with the unit. View this manual at www.hoshizaki.com.

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(AM-50)

(AM-100 & AM-150)

The horizontal evaporator and water distribution system are unique to the Hoshizaki AM and IM series. The AM and the IM series are similar in the fact that they both make ice on a horizontal evaporator. The AM evaporator design however is different, as shown in the center picture. The moving IM water plate and associated parts are eliminated with this simple design.

The AM-50BAE produces 24 cubes and .60 pounds per cycle. The AM-100BAE and AM-150BAF produce 60 cubes and 1.54 pounds per cycle.

The AM series sequence of operation is also different. The sequence of operation for the AM series will be explained in the following pages.

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THERMISTOR

The AM series uses a combination thermistor and control board to control the sequence of operation. When the toggle switch is placed in the “ON” position and the bin control calls for ice, the unit will begin in the initial harvest cycle. Starting the unit in harvest allows the compressor to start in an unloaded condition, greatly extending the life of the compressor. This operation is common among all Hoshizaki cube icemakers.

During the initial harvest, the compressor, hot gas valve and water valve will be energized. The initial harvest is a timed harvest. After 50 seconds, the control board will energize the X1 board relay to start the pump motor and condenser fan motor, switching the unit into the freeze cycle.

After the initial harvest, the X2 board relay will remain energized during the freeze cycle. This allows the water valve to feed fresh water for an additional 50 seconds. This extended fill, only takes place when the unit has restarted from a power interruption or when the bin control calls for ice. During the normal harvest cycle the water valve will de-energize at the beginning of freeze or in the event of long harvest the valve will have a maximum open time of 102 seconds. This could occur in the event of operation in low water and ambient temperatures. During normal operating conditions the unit will run approximately 2~4 minutes in the harvest cycle.

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Note:

*A thermistor temperature of 26.6°F (-3°C) will start 8 minute freeze completion timer.

*A thermistor temperature of 44.6°F (7°C) will start the 50 second defrost completion timer.

*26.6°F (-3°C) = 6.8KΩ thermistor resistance.

*44.6°F (+7°C) = 4.5KΩ thermistor resistance.

Throughout the freeze cycle, which normally last 14~33 minutes, depending on model and operating conditions, the unit will continue to circulate the water from the reservoir to the horizontal evaporator, through the spray tubes. When the temperature of the evaporator has reached approximately 26.6°F (-3°C) and the thermistor signals approximately 6.8KΩ the freeze completion timer will start and count down 8 minutes.

The control board will then switch to normal harvest, re-energize the X2 relay and deenergize the X1 relay. This opens the hot gas valve and water valve and de-energizes the condenser fan motor and water pump. A normal harvest is temperature and time terminated and uses the same thermistor used to terminate the freeze cycle. After the evaporator warms to approximately 44.6°F (+7°C) the thermistor signals the control board with a resistance of approximately 4.5KΩ. The control board then starts the harvest completion timer, which is set at 50 seconds. When this timer completes 50 seconds, it ends the harvest cycle and begins freeze.

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 AM series uses a thermostatic bin control located on the right rear side of the ice storage compartment. This control will open when ice touches the sensing bulb and the unit will shut down

This control includes a small heater to eliminate the control opening due to low ambient temperatures in the bin.

Access the control by removing the wiring channel from the rear of the unit.

The thermostatic bin control is factory set and should shut down the unit within 10 seconds after ice contacts the bulb. Adjustment may be necessary in higher altitudes.

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Hoshizaki AM-50BAE User Manual

AM-50BAE: The control switch is marked “ICE- OFF-WASH” and is located on the lower right front of the unit.

AM-100 & AM-150: The control switch is located on the control box which is located behind the front panel on the left hand side of the unit.

If it is necessary to gain access to the control (AM-50BAE) box, the louvered panel must be removed.

AM-50BAE: This can be done by removing the two screws from the lower portion of the front panel and pulling the panel down slightly to dis-engage the mounting tabs.

AM-100 & AM-150: Remove the middle screw at the bottom of the front panel and lift off.

(AM-100 & AM-150)

The control box is held in place with 2 hex head bolts. Once the bolts are removed, AM-50BAE: The control box can be rotated

(AM-50BAE) approximately 45° CCW allowing easier access to the control box cover and control board.

AM-100 & AM-150: The control box can be pulled out to the front of the unit after the two bolts have been removed.

(AM-100 & AM-150)

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VR1 & VR2

are factory adjusted.

Red paint seals the setting for VR1 & VR2 at this point.

CONTROL BOARD:

A solid state board controls the AM operation. The control board is factory adjusted to produce consistent ice in all ambient conditions.

“NO SEASONAL ADJUSTMENTS ARE REQUIRED”

There are no adjustments needed, however there are two variable resistors on the control board. The first resistor VR1 is used to fine tune the harvest termination temperature adjustment when the control board is manufactured. The adjustment is sealed with red paint and should always remain in the factory setting.

VR2 is set from the factory so that the ice machine will perform at the optimum level. This resistor adjusts the freeze cycle termination setting so the proper cube size is obtained. The VR2 setting is also sealed with red paint and should not be changed.

If you find that the red seal is broken, the board will need to be replaced since these settings cannot be correctly adjusted in the field. The replacement board will be factory set and sealed for proper operation.

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