Hussmann microSC MDN4775B1A User manual

MDN (120V)
Medium Temperature Self Contained
Open Vertical Merchandiser
with R-290 Refrigerant
Installation &
Operation Manual
P/N 9FQ6P11007900_B
June 2023
Spanish P/N 9FQ6P11008200
®
Æ
WARNINGS:
If the information in these instructions are not followed
exactly, a fire or explosion may result, causing property
damage, personal injury or death.
Installation and service must be performed by a qualified
installer or service agency.
READ THE ENTIRE MANUAL BEFORE
INSTALLING OR USING THIS EQUIPMENT.
The unit uses R-290 gas as the refrigerant. R-290 is
flammable and heavier than air. It collects first in low
areas but can be circulated by the fans. If propane gas
is present or even suspected, do not allow untrained
personnel to attempt to find the cause. The propane
gas used in the unit has no odor.The lack of smell does
not indicate a lack of escaped gas. If a leak is detected,
immediately evacuate all persons from the store, and
contact the local fire department to advise them that
a propane leak has occurred. Do not let any persons
back into the store until the qualified service technician
has arrived and that technician advises that it is safe to
return to the store. No open flames, cigarettes or other
possible sources of ignition should be used inside or in
the vicinity of the units.
FAILURETOABIDE BYTHIS WARNING COULD
RESULT IN AN EXPLOSION, DEATH, INJURYAND
PROPERTY DAMAGE.
IMPORTANT
Keep in store for future reference!
MANUAL I/O- MDN R-290 120V

BEFORE YOU BEGIN
Read these instructions completely and carefully.
PERSONAL PROTECTION EQUIPMENT (PPE)
Personal Protection Equipment (PPE) is required whenever installing or servicing this
equipment. Always wear safety glasses, gloves, protective boots or shoes, long pants, and
a long-sleeve shirt as required when installing or servicing this equipment.
1. If the information in these instructions are not followed exactly, a fire or explosion may result, causing property damage, personal injury
or death.
2. Installation and service must be performed by a qualified installer or service agency.
3. This unit is designed only for use with R-290 gas as the designated refrigerant.
THE REFRIGERANT LOOP IS SEALED. ONLY A QUALIFIED TECHNICIAN SHOULD ATTEMPT TO SERVICE!
• Propane is flammable and heavier than air.
• It collects first in the low areas but can be circulated by the fans.
• If R-290 is present or even suspected, do not allow untrained personnel to attempt to find the cause.
• The propane gas used in the unit has no odor.
• The lack of smell does not indicate a lack of escaped gas.
• If a leak is detected, immediately evacuate all persons from the store, and contact the local fire department to advise them that a
pro pane leak has occurred.
• Do not let any persons back into the store until the qualified service technician has arrived and that technician advises that it is
safe to return to the store.
• A hand-held propane leak detector (“sniffer”) shall be used before any repair and/or maintenance.
• No open flames, cigarettes or other possible sources of ignition should be used inside the building where the units are located
until the qualified service technician and/or local fire department determines that all propane has been cleared from the area and
from the refrigeration systems.
• Component parts are designed for propane and non-incendive and non-sparking. Component parts shall only be replaced with
identical repair parts.
FAILURE TOABIDE BY THIS WARNING COULD RESULT IN AN EXPLOSION, DEATH, INJURY AND PROPERTY DAMAGE.
P/N 9FQ6P11007900_B iii

P/N 9FQ6P11007900_B v
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
Merchandiser must operate for 24 hours
before loading product!
Regularly check merchandiser temperatures.
Do not break the cold chain. Keep products
in freezer before loading into merchandiser.
These merchandisers are designed
for only pre-frozen products.
AT TENTION
Merchandiser must operate for 24 hours
before loading product!
Regularly check merchandiser temperatures.
Do not break the cold chain. Keep products in
cooler before loading into merchandiser.
These merchandisers are designed for only
pre-chilled products.

TABLE OF CONTENTS iv
IMPORTANT
KEEP IN STORE FOR FUTURE REFERENCE
Quality that sets industry standards!
12999 St. Charles Rock Road • Bridgeton, MO 63044-2483
U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900
www.hussmann.com
© 2023 Hussmann Corporation
ANSI Z535.5 DEFINITIONS .............. v
INSTALLATION
UL Listing .............................1-1
Federal / State Regulation ................1-1
Hussmann Product Control ...............1-1
Shipping Damage .......................1-1
Apparent Loss Or Damage ...................1-1
Concealed Loss Or Damage ...................1-1
Location ...............................1-1
Part Names ............................1-3
Additional Parts ........................1-4
Model Description ......................1-5
Unloading .............................1-5
Unloading from Trailer ...........................1-5
Serial Plate Location .....................1-5
Exterior Loading ........................1-5
Shipping Skid ..........................1-5
Thermometer ...........................1-5
Equipment Start Up Check List ............1-6
ELECTRICAL / REFRIGERATION
Merchandiser Electrical Data ..............2-1
Field Wiring ............................2-1
Electrical Connections . . . . . . . . . . . . . . . . . . . . 2-1
Electrical Outlet .........................2-1
Power Switch ...........................2-1
Refrigeration (Self Contained Models) ......2-2
Water Outlet and Water Seal ..............2-2
Controls and Adjustments .................2-3
Controller Operation .....................2-4
Controller Connections ...................2-5
Controller Buttons ......................2-6
Setpoint................................2-7
Defrost Sensor Location ..................2-8
Discharge Air Sensor Location .............2-8
Shelves ................................2-9
Stocking ...............................2-9
Drain Water ............................2-9
Re-Start................................2-9
Service Safety ..........................2-10
Replacing Refrigeration System
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
Steps to Recover Refrigerant .............2-11
Charging .............................2-11
MAINTENANCE
Care and Cleaning .......................3-1
Exterior Surfaces ..........................3-1
Interior Surfaces ..........................3-1
Do NOT Use ...........................3-1
Do Use ................................3-1
Removing Scratches from Bumper ..........3-1
Warnings...............................3-2
Cleaning Steel Surfaces ...................3-4
Cleaning Condenser Coils .................3-4
Cleaning Honeycomb.....................3-5
Cleaning Power Plug .....................3-6
Cleaning Drain Evaporation System ........3-6
Changing Moisture Wicking Plates .........3-6
Night Curtain ..........................3-8
SERVICE
“In Case of the Following” ................4-1
LED Power Supply Location ..............4-1
Troubleshooting ........................4-2
Direct Drain ...........................4-3
Replacement Parts List ...................4-7
WARRANTY

P/N 9FQ6P11007900_B vii
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
REVISION HISTORY
REVISION B
Updated California Warning and ANSI/NSF References
ORIGINAL ISSUE — NOVEMBER 2021
Excessive ambient conditions may cause
condensation and therefore sweating of doors.
Facility operators should monitor doors and floor
conditions to ensure safety of persons.
All installation and operating instructions
concerning the handling, moving, and use of
these merchandisers must be carefully followed
to avoid either damaging the refrigerant tubing, or
increasing the risk of a leak.
Case ventilation openings must be clear of any
obstructions. Do not damage the refrigerant
circuit.
Always disconnect the electrical power at the
main disconnect when servicing or replacing any
electrical component. This includes, but is not
limited to, such items as fans, heaters, thermostats
and lights.
Do not use mechanical devices or other means to
accelerate the defrosting process.
Do not use electrical appliances inside the food
storage compartments of the case.
ANSI Z535.5 DEFINITIONS
• DANGER – Indicate[s] a hazardous
situation which, if not avoided, will
result in death or serious injury.
• WARNING – Indicate[s] a
hazardous situation which, if not
avoided, could result in death or
serious injury.
• CAUTION – Indicate[s] a
hazardous situation which, if not
avoided, could result in minor or
moderate injury.
• NOTICE – Not related to personal
injury – Indicates[s] situations, which
if not avoided, could result in damage
to equipment.
!
The safety of our customers and employees is
paramount. The precautions and procedures
described in this manual are intended as general
methods for safe use of this equipment. Please
be sure to comply with the precautions described
in this manual to protect you and others from
possible harm, and follow OSHA standards for
safety.
The definitions at right are used to clarify the
magnitude and urgency of harm and damage,
considering problems arising from misuse.
Relative to their potential danger, the definitions
are divided into four parts according to ANSI
Z535 Series.
!
!
FOR CALIFORNIA INSTALLATIONS ONLY:
WARNING:
Cancer and Reproductive Harm
www.P65Warning.ca.gov
August 31, 2018 3069575
is warning does not mean that Hussmann prod-
ucts will cause cancer or reproductive harm, or
is in violation of any product-safety standards or
requirements. As claried by the California State
government, Proposition 65 can be considered
more of a ‘right to know’ law than a pure product
safety law. When used as designed, Hussmann
believes that our products are not harmful. We
provide the Proposition 65 warning to stay in
compliance with California State law. It is your
responsibility to provide accurate Proposition 65
warning labels to your customers when necessary.
For more information on Proposition 65, please
visit the California State government website.

P/N 9FQ6P11007900_B 1-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
UL LISTING
These merchandisers are manufactured to meet
ANSI/ UL 471 standard requirements for safety.
Proper installation is required to maintain the
listing.
FEDERAL / STATE REGULATION
These merchandisers at the time they are
manufactured, meet all federal and state/
provincial regulations. Proper installation
is required to ensure these standards are
maintained. Near the serial plate, each
merchandiser carries a label identifying the
environment for which the merchandiser was
designed for use. This model is Type II as
described below.
NSF/ANSI 7 Type II – Display Refrigerator / Freezer
Intended for 80°F / 55%RH Ambient Application
NSF/ANSI 7 – Display Refrigerator
Intended for Bulk Produce
HUSSMANN PRODUCT CONTROL
The serial number and shipping date of all
equipment is recorded in Hussmann’s files for
warranty and replacement part purposes. All
correspondence pertaining to warranty or parts
ordering must include the serial number of each
piece of equipment involved. This is to ensure
the customer is provided with the correct parts.
SHIPPING DAMAGE
All equipment should be thoroughly examined
for shipping damage before and during
unloading. This equipment has been carefully
inspected at our factory.
Any claim for loss or damage must be made
to the carrier. The carrier will provide any
necessary inspection reports and/or claim forms.
Apparent Loss or Damage
If there is an obvious loss or damage, it must be
noted on the freight bill or express receipt and
signed by the carrier’s agent; otherwise, carrier
may refuse claim.
Concealed Loss or Damage
When loss or damage is not apparent until
after equipment is uncrated, retain all packing
materials and submit a written response to the
carrier for inspection within 15 days.
LOCATION
These merchandisers are designed for displaying
products in air conditioned stores where
temperature is maintained at or below the
NSF/ANSI 7 specified level and relative humidity
is maintained at or below 55%.
Placing refrigerated merchandisers in direct
sunlight, near hot tables or near other heat
sources could impair their efficiency. Like other
merchandisers, these merchandisers are sensitive
to air disturbances. Air currents passing around
merchandisers will seriously impair their
operation. Do NOT allow air conditioning,
electric fans, open doors or windows, etc. to
create air currents around the merchandiser.
INSTALLATION
Recommended operating ambient
temperature is between 60°F (16°C)
to 80°F (27°C). Maximum relative
humidity is 55%.
Do NOT stand or walk on top of
merchandiser. Do not store items or
ammable materials atop the unit.

1-2 INSTALLATION
P/N 9FQ6P11007900_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
LOCATION (Continued)
Product should always be maintained at proper temperature. This means that from the time the
product is received, through storage, preparation and display, the temperature of the product must
be controlled to maximize the life of the product.
be sure to position self contained merchandisers properly.
SELF CONTAINED models have vented base panels to allow air circulation through the
condensing unit.
Allow for a minimum of 2 inches of clearance from walls, merchandisers, and any other large objects
near the merchandiser’s vented base panels. A minimum space of 2 inches should be left above
the case. Blocking or restricting air flow will adversely affect performance and may damage the
refrigeration system.
If the merchandiser is used or stored in a hot spring or coastal area, it may be damaged (due to
sulfur or salt). If the intention is to install the merchandiser in any of the above areas or locations,
contact the supplier or dealer where you purchased the merchandiser. Do not lay the case sideways
to move the case. This may cause damage. Case should be installed on a flat, level floor.
After installation, fix the case in place with the leveling legs (case option) to make sure that it does
not move. Or if the case has casters, lock the casters.
Do not store items or ammable materials
atop the unit.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
Leveling Legs or Casters
Ground wire
Air inlet
Do not block this inlet
or the merchandiser
will not cool properly
Air Exhaust
(Optional)
Hanging
Wall
Floor
2-inch gap
required
(51 mm)
2-inch gap
required
(51 mm)
Wall

P/N 9FQ6P11007900_B 1-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
Part names
Electrical controls box
Bracket
Shelf
The slots that hold the left
and right shelf brackets are
located at 0.59 inch intervals.
The shelf position can thus
be adjusted to match the
size of the product stored.
Model MDN 120V shown
Tag molding
Deck pan
Front panel
Hussmann logo
Lamp switch
Controller
Main Switch
Overow drain pan
RTN400 Page 17/130
KDEPLUS BUTTONS
The KDEPlus keyboard has 4 keys, as shown in the illustration:
1
2
3
4
Each key has a different function depending on whether it is:
• Pressed and released
• Pressed for at least 5 seconds
• Pressed and held at start-up
• Pressed in combination with another key.
KEYS
The following table summarizes the function of each key:
No Key Action
Pressed and released Press for at least 5 secs Start-up
1• Scrolls through menu items
• Decreases values
Activates the Manual Defrost function
(from outside menus). ---
2• Scrolls through menu items
• Decreases values
Function can be configured by the user
(from outside menus).
(see parameter H32)
---
3
• Returns to the previous menu
level
• Confirms parameter value
Activates the Stand-by function
(from outside menus). ---
4set
• Displays any alarms
(if active)
• Opens Machine Status menu
• Confirms commands
Opens the Programming Menu
(User and Installer parameters)
When pressed during
start-up it enables
the user to select the
application to be loaded.
STANDBY or ESC
DOWN SET
UP

1-4 INSTALLATION
P/N 9FQ6P11007900_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
Part names
Additional parts
Model MDN 120V shown
Night Curtain
(Optional)
LED lamp
Honeycomb
The honeycomb adjusts
the air ow.
Discharge air outlet
Do not block this outlet with
product, or the merchandiser
will not cool properly.
Return air inlet
Do not block this inlet with
product, or the merchandiser
will not cool properly.
Caster
Condensing unit
Overow drain pan
Night Curtain
hook (Optional)
Handrail
Condenser fan
Evaporator fan
Single-phase
120V
power cord
NEMA L5-30P
Air inlet
Do not block this inlet
or the merchandiser
will not cool properly
Appearance Quantity
1pc
Name
Overow drain pan
Air Outlet

P/N 9FQ6P11007900_B 1-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
MODEL DESCRIPTION
The MDN models are open, vertical, medium
temperature display merchandisers. They are
self contained merchandisers with their own
condensing unit. Each self contained model
has a condensing unit that is factory installed
beneath the display area of the case. The unit
is ready for operation when electrical service
is connected. See Section 2 for electrical
information before starting the case.
UNLOADING
Unloading from Trailer:
Lever Bar (also known as a Mule, Johnson
Bar, J-bar, Lever Dolly, or Pry Lever)
Move the merchandiser as close as possible
to its permanent location and remove
all packaging. Check for damage before
discarding packaging. Remove all separately
packed accessories such as kits and shelves.
Improper handling may cause damage to
the merchandiser when unloading. To avoid
damage:
1. Do not drag the merchandiser out of the
trailer. Use a Johnson bar (mule).
2. Use a forklift or dolly to remove the
merchandiser from the trailer.
SERIAL PLATE LOCATION
The serial plate is located at the interior top
left end. It contains all pertinent information
such as model, serial number, amperage rating,
refrigerant type and charge.
EXTERIOR LOADING
Do NOT walk on top of merchandisers or
damage to the merchandisers and serious
personal injury could occur. Merchandisers are
not structurally designed to support excessive
external loading such as the weight of a person.
Do not place heavy objects or flammable
materials on the merchandiser.
SHIPPING SKID
Each merchandiser is shipped on a skid to
protect the merchandiser’s base, and to make
positioning the case easier. Remove the top of
the crate, and detach walls from each other.
Lift crate from the skid. Unscrew the case
from the skid. The fixture can now be lifted
off the crate skid. Lift only at base of skid!
Remove any attached braces and/or skids.
DO NOT TILT MERCHANDISER ON ITS
SIDE OR END WHEN REMOVING SKID.
The case is equipped with casters for ease of
installation and transportation inside store.
Check floor where cases are to be set to see if
it is a level area. Determine the highest part of
the floor.
THERMOMETER
The cabinet has a “pencil” type thermometer
and reads from -40º F to 120º F / -40º F to
50º F on 2º increments. The thermometer
is located in the packout kit inside of the
merchandiser.It should be placed and left
inside the bottom front interior compartment
during normal operation of the merchandiser.
Serial Plate
Do NOT remove shipping crate until the
merchandiser is positioned for installation.

1-6 INSTALLATION
P/N 9FQ6P11007900_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
Hussmann Self-Contained Refrigeration Equipment Start Up Check List
***Please note that failure to follow this start-up document may void your factory warranty***
Form HSCW01 Rev. 30MAY12 P/N 0525209_B
Step Startup Activity Check
1 Locate, read and maintain install/operation manual in a safe place for
future reference.
2 Examine unit. Confirm there is NO damage or concealed damage.
3 Level the unit, side to side and front to rear.
4 Remove all shipping brackets/compressor straps/bolts etc. as required
5 Unit must be run on a dedicated electrical circuit without the use of
an extension cord.
6 Ensure that the proper electrical requirements for the equipment are
supplied.
7 Verify field electrical connections are tight.
8 Verify all electrical wiring is secured and clear of any sharp edges or
hot lines.
9 Verify the condensate drain line is properly trapped and pitched.
10 Verify all required clearances on the sides and back of unit.
11 Verify there are no air disturbances external to the unit. Heat and air
registers, fans, and doors etc.
Advise owner/operator that merchandiser must operate at temperature for 24 hrs prior to loading
with product.
LEGAL DISCLAIMER:
Hussmann shall not be liable for any repair or replacementsmade without the written consent of Hussmann, or when the product is installed or operated in a manner
contrary to the printed instructions covering installation and service which accompanied such product.

P/N 9FQ6P11007900_B 2-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
ELECTRICAL / REFRIGERATION
MERCHANDISER ELECTRICAL DATA
Refer to merchandiser serial plate for electrical
information.
FIELD WIRING
Field wiring must be sized for component
amperes stamped on the serial plate. Actual
ampere draw may be less than specified.
ELECTRICAL CONNECTIONS
All wiring must be in compliance with NEC
and local codes. Self contained models are
electrical cord connected at the electrical box.
Ensure ground pin is attached. For any
questions, contact the supplier or dealer where
you purchased the product or licensed service
provider.
This unit uses a powercord
with NEMA (L5-30P) plug.
The powercord is rated for
30A/120V.
ELECTRICAL OUTLET
Before the merchandiser is connected to any
wall circuit, use a voltmeter to check that the
outlet is at 100% of the rated voltage. The wall
circuit must be dedicated for the merchandiser.
Failure to do so voids the warranty. Do not use
an extension cord. Never plug in more than one
merchandiser per electrical circuit.
• Always use a dedicated circuit with the
amperage stated on the unit.
• Plug into an outlet designed for the plug.
• Do not overload the circuit
• Do not use long or thin extension cords.
Never use adapters.
• If in doubt, call an electrician.
Ensure ground pin is attached.
For any questions, contact the supplier or
dealer where you purchased the product or
licensed service provider.
POWER SWITCH
The main ON/OFF switch is located on the
front control on the bottom, righthand-side of
merchandiser.
ALWAYS CHECK THE SERIAL PLATE FOR
COMPONENT AMPERES
Risk of Electric Shock. If cord or plug
becomes damaged, replace only with a
cord and plug of the same type.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
Merchandiser must be grounded.
Do not remove the power supply cord ground.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
Remove front grille. Power switch
is located on the righthand side
of the merchandiser, behind front
grille.
Power Switch
Front Grille

2-2 ELECTRICAL / REFRIGERATION
P/N 9FQ6P11007900_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
REFRIGERATION
Each self-contained model is equipped with
its own condensing unit and control panel
located beneath the display area. The correct
type of refrigerant will be stamped on each
merchandiser’s serial plate. The merchandiser
refrigeration piping is leak tested. The unit is
charged with refrigerant, and shipped from the
factory with all service valves open.
WATER OUTLET AND WATER SEAL
The condensate water outlet is located at the
front of the liner bottom under deck pan. The
outlet has a factory installed, external water
seal.
For self contained models, this water seal
drains into the condensate evaporator pan
located beneath the merchandiser.
NOTE: All lower base panels must be in place
when the refrigerator is operating. If not,
airflow from the condenser will be directed
over the evaporator pan and defrost water in
the pan may overflow.
Refrigeration lines are under pressure.
Refrigerant must be recovered before
attempting any connection or repair.
— LOCK OUT / TAG OUT —
To avoid serious injury or death from electrical
shock, always disconnect the electrical power
at the main disconnect when servicing or
replacing any electrical component. This
includes, but is not limited to, such items as
doors, lights, fans, heaters, and thermostats.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
Product will be degraded and may spoil if
allowed to sit in a non-refrigerated area.
DANGER
!
DANGER
!
CAUTION
!
WARNING
!
NOTE
NOTE
STOP STOP
IMPORTANT
ATTENTION
INSTALLER
NOTICE
It is the contractor’s responsibility to
install merchandiser(s) in accordance with
all local building and health codes.
...ATTENTION
INSTALLER

P/N 9FQ6P11007900_B 2-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
The controller controls refrigeration temperature. The controller is factory installed in the control
panel mounted on the merchandiser’s fascia.
Discharge air temperatures should be measured at the center of the honeycomb. Defrosts are time
initiated and temperature terminated for these models. The defrost setting is set in the factory.
The product application is factory set for Med. Temp. - NSF7 as shown below.
CONTROLS AND ADJUSTMENTS
Controller
Set Point ( ° F )
Defrost Frequency
(perday) Type of Defrost Temp. Termination Failsafe time ( min )
Med Temp - DOE
23 ° F ( - 5 ° C )
Med Temp - NSF 7 Type 1
19 ° F ( - 7 ° C )
Med Temp - DOE
28 ° F ( - 2 ° C )
Med Temp - NSF 7 Type 1
25 ° F ( - 4 ° C )
Note: The cases are shipped out from factory with controller settings to comply with NSF 7 requirements.
6Off Time 45 ° F ( 7 ° C ) 50
MDN3575B1A/S1A 25 ° F - 27 °F ( -4 °C to -3 °C )
MDN4775B1A/S1A 25 ° F - 27 °F ( -4 °C to -3 °C )
0
10
20
30
40
50
60
1
45 89
133 177 221 265 309 353 397 441 485 529 573 617 661 705 749 793 837 881 925 969
1013 1057 1101 1145 1189 1233 1277 1321 1365 1409
Honeycomb Discharge air temp MDN3575 B1A @ NSF
Type 1 ( °F )
Discharge Air Temperature
(Avg Ref mode )
Product Application
Model
Controller
Set Point ( ° F )
Defrost Frequency
(perday) Type of Defrost Temp. Termination Failsafe time ( min )
Med Temp - DOE
23 ° F ( - 5 ° C )
Med Temp - NSF 7 Type 1
19 ° F ( - 7 ° C )
Med Temp - DOE
28 ° F ( - 2 ° C )
Med Temp - NSF 7 Type 1
25 ° F ( - 4 ° C )
Note: The cases are shipped out from factory with controller settings to comply with NSF 7 requirements.
6Off Time 45 ° F ( 7 ° C ) 50
MDN3575B1A/S1A 25 ° F - 27 °F ( -4 °C to -3 °C )
MDN4775B1A/S1A 25 ° F - 27 °F ( -4 °C to -3 °C )
0
10
20
30
40
50
60
1
45 89
133 177 221 265 309 353 397 441 485 529 573 617 661 705 749 793 837 881 925 969
1013 1057 1101 1145 1189 1233 1277 1321 1365 1409
Honeycomb Discharge air temp MDN3575 B1A @ NSF
Type 1 ( °F )
Discharge Air Temperature
(Avg Ref mode )
Product Application
Model

2-4 ELECTRICAL / REFRIGERATION
P/N 9FQ6P11007900_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
CONTROLLER OPERATION
The electronic controller is located in the
cassette compartment. The controller comes
factory set, and is ready for use. The front
grille must be removed in order to access this
control. When removing the grille for this
operation or for condenser cleaning, care must
be taken not to damage the display interface
cable. It may be unplugged during this task.
1. Plug the merchandiser plug into its receptacle.
a. The controller display will illuminate.
b. The interior light will illuminate.
2. After the control preprogrammed time delay
of up to 6 minutes, the compressor and
evaporator fan(s) will start if the control is
calling for cooling.
3. The control will cycle the compressor but
may also cycle evaporator fan(s) on and off
determined by the Set-Point and Differential
temperatures.
a. The Set-Point is the adjustable
preprogrammed temperature.
b. The Differential is the non-adjustable pre
programmed temperature.
c. The Control is designed to read and display
a cabinet temperature not a product
temperature.
This cabinet temperature may reect the
refrigeration cycle of the Set-Point and its’
Differential. The most accurate temperature
on a cabinets operation is to verify the product
temperature.
Main Features:
• Panel-mounted
• Energy saving algorithms and optimized
defrost control
• 8 preloaded applications
• Defrost at single / double evaporator
• Frame Heater
• Local network auto-conguration
• Direct load connection (up to 2 HP)
• Supply voltage control LVD
• Presence of an open collector output

P/N 9FQ6P11007900_B 2-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Open Vertical Merchandisers
RTN400 Page 8/130
CONNECTIONS
TERMINALS
LINK2
KEYB
{
{
RS485
OPTIONAL
ELIWELL
ELIWELL
33
32
31
29
30
28
27
26
25
24
22
20
18
23
21
19
1
2
3
5
9
4
11
12
10
GND D
GND
GND
D
OC
12V
D
12V
15 16 17
34 35 36 37 38 39
A
14
13
6
8
7
OUT2 (1HP)
OUT1 (2HP)
OUT3 (8A)
OUT4 (8A)
*N.B.: analogue inputs PB1...PB5 can also be configured as Digital Inputs DI.
TERMINALS
1-2 NEUTRAL. These are power supply terminals. 15-16-17 Connection to KDEPlus or KDWPlus external
keyboard or ECPlus echo module.
3LINE. These are power supply terminals. 19-18 PB1 probe connection.
4OUT2 Shared Terminal 21-20 PB2 probe connection.
5N.O. OUT2 23-22 PB3 probe connection.
6N.C. OUT2 23-24 PB4 probe connection.
7OUT3 Shared Terminal 23-25 PB5 probe connection.
8N.C. OUT3 27-26 Digital input (DI).
9N.O. OUT3 28-29 LINK2. Connection 1 - local area network.
10 OUT1 Shared Terminal 30-31 LINK2. Connection 2 - local area network.
11 N.O. OUT1 32-33 Open Collector Output (OC).
12 Not Used ATTL Unicard/DMI/Multi Function Key connection
13 OUT4 Shared Terminal 34-35-36 RS485. Connection 1 - Supervision Gateway.
14 N.O. OUT4 37-38-39 RS485. Connection 2 - Supervision Gateway.

2-6 ELECTRICAL / REFRIGERATION
P/N 9FQ6P11007900_B U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
RTN400 Page 17/130
KDEPLUS BUTTONS
The KDEPlus keyboard has 4 keys, as shown in the illustration:
1
2
3
4
Each key has a different function depending on whether it is:
• Pressed and released
• Pressed for at least 5 seconds
• Pressed and held at start-up
• Pressed in combination with another key.
KEYS
The following table summarizes the function of each key:
No Key Action
Pressed and released Press for at least 5 secs Start-up
1• Scrolls through menu items
• Decreases values
Activates the Manual Defrost function
(from outside menus). ---
2• Scrolls through menu items
• Decreases values
Function can be configured by the user
(from outside menus).
(see parameter H32)
---
3
• Returns to the previous menu
level
• Confirms parameter value
Activates the Stand-by function
(from outside menus). ---
4set
• Displays any alarms
(if active)
• Opens Machine Status menu
• Confirms commands
Opens the Programming Menu
(User and Installer parameters)
When pressed during
start-up it enables
the user to select the
application to be loaded.
STANDBY or ESC
DOWN SET
UP
Product will be degraded and may spoil if
allowed to sit in a non-refrigerated area. Do NOT allow cleaning agent or
cloth to contact food product.