Hoshizaki AM-50BAE Manual

AM SERVICE TRAINING

Featuring the

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

80047 www.hoshizakiamerica.com 5-20-04

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

-2-

20mm

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.

Thecompact AM-50BAE unit is 14 7/8”wx

22 5/8”dx 33 1/2”hand 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.

-3-

WATER INLET CONNECTIONS

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 AM-

150 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 AM-

150BAF.

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.

DRAIN

CONNECTIONS

4A32

1/2” FPT

4A3207-01

3/8” Male flare

(AM-50 through April

2004)

(AM-100 & AM-150)

AM-50 from May 2004

1/2” FPT

3/4” MPT

5/8” I.D. rubber hose

-4-

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.

-5-

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.

(AM

50)

(AM-100 & AM-150)

-6-

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.

Thermistor

THERMISTOR

-7-

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 6.8KΩthe

freeze completion timer will start and count

down 8minutes.

The control board will then switch to normal

harvest, re-energize the X2 relay and de-

energize 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

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.

-8-

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.

-9-

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

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.

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

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)

(AM-50BAE)

(AM-100 & AM-150)

(AM-50BAE)

-10 -

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.

VR1 & VR2

are factory adjusted.

Red paint seals the

setting for VR1 &

VR2 at this point.

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