Delfield ACR-26S Service Manual

Service and
Installation Manual

Please read this manual completely before attempting to install
or operate this equipment! Notify carrier of damage! Inspect all
components immediately. See page 2.

Air Curtain Refrigerator

ACR-26S

Effective September 1998

074-2900

DELFIELD

PART NUMBER

MODEL

NUMBER

H.P.AMPS

VOLTS/HERTZ/

PHASE

STORAGE
CAPACITY

18" x 26" TRAY

CAPACITY

BTU/HR

DOOR CLOSED

BTU/HR

SYSTEM CAP.

Air Curtain Refrigerator

ACR-26S

1/2 504 3300 5-15P

SHIP

WEIGHT

NEMA
PLUG

592 lbs./266 kg.1012.0 12.5 ft

3

115V/60Hz/1ph

Contents

Serial Number Information

SERIAL NUMBER LOCATION . . . . . . . . . . . . . . . . . . . . . .2

RECEIVING AND INSPECTING . . . . . . . . . . . . . . . . . . . .2

MECHANICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

MCII Tempatrol® FUNCTION SETTINGS . . . . . . . . . . . . .4

BASIC OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

MCII TEMPATROL®

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Display functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Defrost settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Optional settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Self-diagnostic system . . . . . . . . . . . . . . . . . . . . . . . . . .10

REFERENCE CHARTS

MCII Tempatrol® CHECK SYSTEM warnings . . . . . . .10

MCII Tempatrol® diagnostic codes. . . . . . . . . . . . . . . .11

MCII Tempatrol® display . . . . . . . . . . . . . . . . . . . . . . .11

MCII Tempatrol® troubleshooting . . . . . . . . . . . . . . . .12

WIRING DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

REPLACEMENT PARTS LISTS . . . . . . . . . . . . . . . . . . . . .14

WARRANTIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-17

AUTHORIZED PARTS DEPOTS . . . . . . . . . . . . . back cover

To view the serial number of the ACR-26S refrigerator, open
the door of the unit. The serial number is located on the inside
back wall in the top left corner of the unit.

Always have the serial number of your unit available when call
ing for parts or service. A complete list of authorized Delfield
parts depots is shown on the back cover of this manual.

©1998 The Delfield Company. All rights reserved. Reproduction without
written permission is prohibited.

The starburst “1” symbol is a trademark and “Delfield” is a registered
trademark of The Delfield Company.

-

Receiving and Inspecting the Equipment

Even though most equipment is shipped crated, care should
be taken during unloading so the equipment is not damaged
while being moved into the building.

Carefully check for any visable signs of damage to cartons or
containers. If evidence of damage exists, the package should
be opened immediately and joint inventory and examination
of the contents should be made by you and the driver.

Concealed damage

If a concealed loss or damage is discovered after you have
given the carrier a clear delivery receipt, notify the carrier

in writing immediately or within 10 days from the
delivery date. If you phone the carrier, you must follow

up the call in writing to protect your rights. You can only
improve your position as a claimant by promptly reporting
such loss or damage. You should also retain all cartons or
containers, including packing material, until an inspec­tion has been made or waived.

Filing a claim

Notation of loss or damage does not constitute the filing of a
claim. You should file your claim in writing with the carrier
immediately!

Carriers will furnish the necessary form upon request. You
should also request an inspection. If a claim is filed by
phone, always follow up immediately in writing.

Specifications

2

For customer service, call [phone],
[phone] or [phone]

Installation

When the door is open, Delfield’s patented air curtain design
directs cold air across the cabinet opening, keeping hot air
out and cold air in for extended periods of time. The unit
will maintain a maximum of 45°F box temperature at 70°F
ambient with the door open during peak production times,
quickly returning to a normal 36°F. With the door closed,
a maximum 40°F at 100°F ambient is maintained (normal
operation) while running only 15% in an 85° room.

Location

Be sure the location chosen has a floor strong enough to sup­port the total weight of the cabinet and contents. Reinforce
the floor if necessary to provide for maximum loading.

Don’t pack the interior of the refrigerator so full that air can­not circulate. When operating open, keep trays pushed all the
way in so that they do not disrupt the air curtain air flow.

Avoid placing unit under air conditioning vents or other venti­lation fans that may affect the air curtain when door is open.

Leveling

A level cabinet looks better and will perform better because the
doors will line up with the door frames properly, the cabinet
will not be subject to undue strain, and the contents of the cab­inet will not move around on the shelves. Use a level to make
sure the unit is level from front to back and side to side.

Stabilizing

The ACR-26S is supplied with casters for your convenience,
ease of cleaning underneath and for mobility. Two locking
casters allow you to stabilize the unit if you are loading or
unloading product.

Electrical connection

Refer to the amperage data shown on page 1 of this manual,
the serial tag and your local code or the National Electrical
Code for proper wire sizes. All case wiring is labeled with
the required voltage-be sure it is connected to the proper
power source. A protected circuit of the correct voltage and
amperage must be run for connection of the line cord or per­manent connection to the unit.

The power switch should be turned to the OFF position and
the power cord disconnected whenever performing mainte­nance functions or cleaning the refrigerated cabinet area.

Reversing the door hinging

The following steps will allow you to reverse the side the
door hinges on.

1. Open the door to 180° open position.

2. Lift up door and remove door from hinges in fully open
position.

3. Remove pins from hinges.

4. Remove both hinges and relocate on the opposite side.
Tighten hinges.

5. Unscrew the lock stop tab from the top of door and
mount to the bottom in the holes provided.

6. Invert the door and mount it into the hinges in the
fully open position.

Magnetic door

Open the ACR’s door completely and the magnetic strip built
in to the frame allows the door to remain open while loading
or unloading.

Maintenance

The interior and exterior can be cleaned using soap and
warm water. If this is not sufficient, try ammonia and water
or a nonabrasive liquid cleaner. When cleaning the exterior,
always run with the “grain” of the stainless steel to avoid
marring the finish. Do not use an abrasive cleaner because it
will scratch the stainless steel and plastic.

In order to maintain proper refrigeration performance, the
condenser fins must be cleaned of dust, dirt and grease
regularly. It is recommended that this be done at least every
three months. If conditions are such that the condenser is
totally blocked in three months, the frequency of cleaning

should be increased. Clean the condenser with a vacuum
cleaner or stiff brush. If extremely dirty, a commercially
available condenser cleaner may be required.

Door gaskets should be cleaned as required to maintain their
ability to seal properly. Do not use sharp tools or knives to
scrape the bellows as this may tear the gasket and eliminate its
ability to seal. A bristle brush and solution of soap and water
should be all this is required to keep the gaskets clean. Do not
use full strength de-greasing agents on the gasket because they
could cause the gasket to crack and become brittle.

Customer service FAX [phone]

3

MCII Function Settings

The MCII microprocessor has been preset at the facto­ry for the following functions eliminating the need for
programming when your unit arrives. These settings

must be correct for your unit to operate properly.

1. Enter diagnostic . . . . . . . . . . Press down + time > temp

2. Enter Phase II . . . . . . . . . . . . . . . . . . . . . . . Press defrost

3. Scroll to “Basic function” . . . . . . Press up/down - go to

“012”**** - set at 0:01

4. Scroll to temperature range . . . . . . Press up/down - go to

“015” - set at 0:07

5. Scroll to defrost termination temp . . . . . Press up/down

-go to “005” - set at 0.03

6. Press reset button

7. Press temp button. . . . . . . . . . . . . Temp should read 0°F

8. Scroll up or down . . . . . . . . . . . . . . . . Set at 36°F (2°C)

***Basic function (“012”) must be set first otherwise
it will cancel out everything previously entered.

Basic Operation -

After plugging the unit in and turning the power switch to
ON, the unit will operate immediately upon start without
any programming of the MCII Tempatrol
freezer temperature is preset to 0°F and the refrigerator is
preset to 37°F. NOTE: Freezer cabinets have a built-in differ
ential; the actual interior temperature will be 0 to 3 degrees
lower than the set point.

When the unit is started, the digital display will flash, and will
continue flashing if the interior cabinet temperature is over the
set temperature range. When the cabinet is cooled to the set

For Units Built With The MCII Tempatrol

®

required. The

®

temperature range, the display will stop flashing.

When the unit is restarted after a power interruption, the digi­tal display will flash only if the interior cabinet temperature is
over the set temperature range. When the cabinet is cooled to

-

the set temperature range, the display will stop flashing.

Every time the unit is started or restarted, the clock must be set
to the correct time of day if a custom defrost plan has been pre­viously entered into the MCII Tempatrol. Otherwise, the clock
will resume at the time when the power was interrupted.

4

For customer service, call [phone],
[phone] or [phone]

MCII Tempatrol

RESET

®

CHECK SYSTEM DEFROST
AM PM

CLEAN
CONDENSER

DOOR AJAR

ST PE SST PE S

®

Controls

RESET

• Turns off alarms

• Terminates the cur-

rent defrost cycle

• Returns display of

cabinet temperature

MCII Tempatrol

Normal display

Normal display

The normal display is the interior cabinet temperature in

The normal display is the interior cabinet temperature in
degrees Fahrenheit. (For details on changing the display

degrees Fahrenheit. (For details on changing the display
to show the temperature in degrees Celsius, see page 10.)

to show the temperature in degrees Celsius, see page 10.)
Pressing the RESET button always displays current temper-

Pressing the RESET button always displays current temper­ature. By pressing TEMP, you can read the set point of the

ature. By pressing TEMP, you can read the set point of the
interior cabinet. The display will automatically return to the

interior cabinet. The display will automatically return to the
current interior temperature after one minute.

current interior temperature after one minute.

It is not unusual for the interior temperature to rise rapidly

It is not unusual for the interior temperature to rise rapidly
when a door is opened. The temperature displayed is usu-

when a door is opened. The temperature displayed is usu­ally the warmest temperature inside the unit. This is done

ally the warmest temperature inside the unit. This is done
purposely to make sure that the entire storage area is always

purposely to make sure that the entire storage area is always
represented by the display and assures that the refrigeration

represented by the display and assures that the refrigeration
system is activated quickly to return the storage area to its

system is activated quickly to return the storage area to its
correct temperature.

correct temperature.

Remember that the temperature displayed represents a pre-

Remember that the temperature displayed represents a pre­cision measurement of the actual air temperature, not an

cision measurement of the actual air temperature, not an
average temperature. When a door is opened, the cold air

average temperature. When a door is opened, the cold air
literally “falls out” and warm air rushes in. What the display

literally “falls out” and warm air rushes in. What the display
shows is real, and provides more accurate control.

shows is real, and provides more accurate control.

TIME

• Displays the current
time (if set)

• Allows setting the
clock by pressing UP
and DOWN buttons

• Starts a manual
defrost cycle when
pressed simul­taneously with

DEFROST

®

Display Functions

DEFROST

• Displays current
defrost setting
(A,3,4,6 or 8)

• Allows setting
defrost setting and
times by pressing
UP and DOWN but
tons

• Starts a manual
defrost cycle when
pressed simulta­neously with TIME

TEMP

• Displays current tem­perature set point

• Allows modification
of set point by press
ing UP and DOWN
buttons

-

Normal display

Flashing temperature disply

The normal display is the interior cabinet temperature in

A flashing temperature display can be caused by four situa­degrees Fahrenheit. (For details on changing the display to

tions, and is the first signal of a possible problem:

show the temperature in degrees Celsius, see page

1. The unit has been started, or restarted after a

10.) Pressing the RESET button always displays cur-

power loss, and has not yet reached set tempera-

rent temperature. By pressing TEMP, you can read

ture.

the set point of the interior cabinet. The display will

2. The interior cabinet is over temperature. This
automatically return to the current interior tempera-

occurs when a freezer reaches 32°F (0°C) or

ture after one minute.

when a refrigerator reaches 65°F (18°C). This

It is not unusual for the interior temperature to rise

condition will stop when the temperature returns

rapidly when a door is opened. The temperature

to a reading below these warning levels.

displayed is usually the warmest temperature inside

3. Long duty cycle. The unit has been running
the unit. This is done purposely to make sure that

for one continuous hour without a door being

the entire storage area is always represented by the

opened. This condition will stop if RESET is

display and assures that the refrigeration system is

pressed, a door is opened, or if the compressor

activated quickly to return the storage area to its cor-

shuts off.

rect temperature.

4. The door has been ajar for over one minute. This
Remember that the temperature displayed represents

condition will stop if the door is closed.

a precision measurement of the actual air tempera-
ture, not an average temperature. When a door is
opened, the cold air literally “falls out” and warm air

• When time is

• When defrost set

-

• When first defrost

• When set point is

UP

displayed, changes
time forward

­ting is displayed,
moves forward
through choices

time is displayed,
moves the hour
forward

displayed, moves set
point up one degree

Continued on the next page

• When time is
displayed, changes
time backward

• When defrost set
ting is displayed,
moves backward
through choices

• When first defrost
time is displayed,
moves the hour
backward

• When set point is
displayed, moves
set point down one
degree

DOWN

-

Customer service FAX [phone]

5

MCII Tempatrol

®

CHECK SYSTEM DEFROST
AM PM

CLEAN
CONDENSER

DOOR AJAR

®

CHECK SYSTEM DEFROST
AM PM

CLEAN
CONDENSER

DOOR AJAR

®

CHECK SYSTEM DEFROST

AM PM

CLEAN
CONDENSER

DOOR AJAR

®

CHECK SYSTEM DEFROST
AM PM

CLEAN
CONDENSER

DOOR AJAR

®

CHECK SYSTEM DEFROST
AM PM

CLEAN
CONDENSER

DOOR AJAR

ST PE S

RESET

®

CHECK SYSTEM DEFROST

AM PM

CLEAN
CONDENSER

DOOR AJAR

®

Display Functions

(continued)

Door ajar

The DOOR AJAR indicator
light will come on when a
door is opened. If the door
remains open for more than
one minute, the temperature
display will begin to flash.
After three minutes, a loud beep is emitted every three sec­onds. The flashing display and warning beep will stop when
RESET is pressed. If the door is not closed when RESET is
pressed, the same cycle will repeat.

Clean condenser

The CLEAN CONDENSER
indicator light is a mainte­nance reminder that comes
on every 90 days. It will go
off when the RESET button is
pressed.

Defrost

The DEFROST indicator light
comes on during defrosting
cycles. The defrost cycle may
be terminated by pressing the
RESET button. Warmer inte­rior cabinet temperatures are
normal during and after defrosting.

Check system

The CHECK SYSTEM indi­cator light comes on when a
significant malfunction of the
unit has occurred, such as an
incomplete defrost, continu­ous compressor operation with
accompanying over-temperature
condition, or sensor failure. After 2™ hours in this condition, a
loud warning beep is emitted every second. The beep will stop
if RESET is pressed.

Clock display

Setting the CLOCK is not
essential to operation unless
custom defrost times have
been set on freezer units and
while not in automatic (A)
mode. If the power is interrupted, the clock may have to be
reset for correct custom defrost timing.

Setting the clock

To set the clock, perform the following steps:

®

MCII Tempatrol

Programming

1) Press RESET to clear the flashing display; this
must be done to make the rest of the keypad
functional.

2) Press the TIME button to show current time (set
to 12:00 a.m. when started or restarted).

6

For customer service, call [phone],
[phone] or [phone]

3) Press UP or DOWN to set the correct time.
Note the AM and PM indicators at the left of the
clock display.

4) Press

RESET to return to interior cabinet tem-

perature display.

If the defrost cycle starts while the clock is being set, stop
pressing the UP or DOWN button and wait a couple of
seconds before continuing. This will help to keep the time
display advancing quickly.