Hussmann DDSS-4MC User manual

HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
DDSS-4MC
Medium Temperature Self Contained
Open Vertical Merchandisers
Installation &
Operation Manual
P/N 0515957_M
June 2018
IMPORTANT
Keep in store
for future reference!
DDSS-4MC
Spanish 0531283
French 0531284
®
Æ

P/N 0515957_M iii
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 01 800-890-2900
www.hussmann.com
© 2018 Hussmann Corporation
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 pre-chilled products only.

HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers
P/N 0515957_M iii
ANSI DEFINITIONS ................ vi
INSTALLATION
UL Listing ......................... 1-1
Federal / State Regulation ............ 1-1
Hussmann Product Control ........... 1-1
Shipping Damage ................... 1-1
Location ........................... 1-1
Model Description .................. 1-3
Unloading ......................... 1-3
Exterior Loading .................... 1-3
Shipping Skid ...................... 1-3
Merchandiser Leveling ............... 1-4
Serial Plate Location ................. 1-4
Refrigeration Unit Access ............. 1-4
Casters ............................ 1-4
Sealing Merchandiser to Floor ......... 1-4
Refrigeration Equipment Start
Up Check List ...................... 1-5
ELECTRICAL / REFRIGERATION
Merchandiser Electrical Data .......... 2-1
Field Wiring ........................ 2-1
Electrical Connections . . . . . . . . . . . . . . . . 2-1
Electrical Outlet ..................... 2-1
Refrigeration (Self Contained).......... 2-1
Water Outlet and Water Seal .......... 2-2
START UP / OPERATION
Controller Operation ................. 3-1
Further Information ................. 3-3
Connections ........................ 3-4
LED .............................. 3-4
KDE Plus Buttons ................... 3-4
Setpoint ........................... 3-7
Sensor Location ..................... 3-8
Controls and Adjustments ........... 3-10
Shelves ........................... 3-11
Load Limits ....................... 3-11
Stocking .......................... 3-11
Thermometer ...................... 3-12
Lighting........................... 3-12
Night Cover ....................... 3-12
MAINTENANCE
Care and Cleaning ................... 4-1
Do NOT Use ....................... 4-1
Do ............................... 4-1
Removing Scratches from Bumper ...... 4-2
Cleaning Under Fan Plenum .......... 4-2
Cleaning Stainless Steel Surfaces ....... 4-2
Cleaning Discharge Honeycomb ....... 4-3
Cleaning Coils ...................... 4-3
Cleaning Evaporation Pan ............ 4-4
Maintaining Fluorescent Lamps ........ 4-4
SERVICE
Replacing Fan Motors and Blades ...... 5-1
Replacing Electronic Ballasts or
LED Power Supplies ................. 5-2
Replacing Fluorescent or LED Fixtures . 5-2
APPENDIX
Repairing Aluminum Coil .............A-1
Part Numbers ...................... A-2
Plan View DDSS-4MC .............. A-4
Cross Sections and Refrigeration Data .. A-5
Defrost Data........................A-5
Physical Data .......................A-5
Electrical Data ..................... A-6
Self Contained Wiring Diagram ....... A-7
WARRANTY
TABLE OF CONTENTS v
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers

vi
P/N 0515957_M U.S. & Canada 1-800-922-1919 • Mexico 01-800-890-2900 • www.hussmann.com
REVISION HISTORY
REVISION M — Page 3-8 removed sensor wire color
REVISION L — 1. Page 3-1 to 3-5-Removed previous
controller information and replaced with new controller
information 2. Page 3-6- Changed sensor colors Black to
Green and Yellow to Orange - Replaced Sensors connec-
tions picture 3. Page 3-7-Replaced controller information
4. Page A-2-Removed selected components from part list
and added parts 5. Page A-5-Removed thermostat set-
ting selected information-On defrost termination change
pressure (psig) to temperature (°F) 6. Page A-7-Replaced
diagram with new revision
REVISION K — Revised for DOE
REVISION J — Updated Plug, Page 2-1 and A-7
REVISION H — Updated Wiring Diagram
REVISION G — Sensor Location, 3-6; Updated Coil
photos, 3-8, parts list A-1, A-2 new Wiring Diagram, A-5
Replacing Fluorescent Lamps and Ballasts, 5-2
REVISION F — Added Checklists Page 1-7 and
1-8; Added Warning Page 1-3; Cleaning Coils 4-3;
Maintaining Fluorescent Lights 4-4.
REVISION E— FEBRUARY 2012
1. Updated Wiring Diagrams
2. Updated Mexico phone number
REVISION D— JANUARY 2012
1. Removed DDSS-4 Model
2. Added new part numbers
3. Revised refrigeration data
4. Added LED replacement, Page 5-2
REVISION C— MAY 2011
1. Revised Cross Section Shelf Length, page A-4
REVISION B— OCTOBER 2010
1. Added self contained location drawings, page 1-2
2. Added Remote Line Sizing, Koolgas, page 2-2
3. Added Koolgas and Remote Refrigeration, page 2-9
4. Added TEV drawing and adjustment, page 3-8
5. Added Cleaning Precautions, page 4-4
6. Added dimension drawings & technical data,
pages, A-1, A-2
ORIGINAL ISSUE — MARCH 2010
* * * * * * * * * * * * * * * * * * * * * * * * * *
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.

P/N 0515957_M 1-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers
UL LISTING
These merchandisers are manufactured to meet
ANSI/ UL 471 standard requirements for safe-
ty. Proper installation is required to maintain
the listing.
FEDERAL / STATE REGULATION
These merchandisers at the time they are man-
ufactured, 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. A Type II
fan speed control kit is required for each mer-
chandiser to operate at Type II conditions.
ANSI/NSF-7 Type I – Display Refrigerator /
Freezer
Intended for 75°F (24°C) / 55%RH Ambient Application
ANSI/NSF-7 Type II – Display Refrigerator / Freezer
Intended for 80°F / 55%RH Ambient Application
ANSI/NSF-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 cor-
rect 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 ANSI / NSF-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
65°F (18°C) to 80°F (26.7°C).
Maximum relative humidity is 55%.

1-2 InstallatIon
P/N 0515957_M U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
Product should always be maintained at prop-
er temperature. This means that from the time
the product is received, through storage, prepa-
ration and display, the temperature of the prod-
uct must be controlled to maximize the life of the
product.
Besure 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 4 in.
clearance from walls, merchandisers, and any
other large objects near the merchandiser’s
vented base panels (for self contained models).
Blocking or restricting air flow will adversely
affect performance and may damage the refrig-
eration system.
Maintain 4 in.
Clearance
Maintain
4 in.Clearance
4 in.
Clearance
Air
Intake
Air
Exhaust
Air
Exhaust
Maintain 4 in. Clearance
Around Merchandiser
Keep discharge and intake areas
free from air currents.
Keep discharge and intake areas
free from air currents.
(Plan View)
Air
Exhaust
Air
Exhaust
Air Intake
Air Intake
Front Back
(Plan View)
Air
Intake
This product may contain chemicals known
to the State of California to cause cancer,
birth defects, or other reproductive harm.
This warning is the result of the California State
law known as the California Safe Drinking Water
and Toxic Enforcement Act of 1986, which is
commonly referred to as “Proposition 65.”
This warning does not mean that Hussmann
products 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.
For California Businesses:

P/N 0515957_M 1-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers
MODEL DESCRIPTION
The DDSS models are open, vertical, medium
temperature display merchandisers. Each self
contained model will have its own condensing
unit, factory installed beneath the display area
of the case ready for operation when electrical
service is connected.
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 dam-
age:
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.
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 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 braces and/or skids
attached (blanket wrapped merchandiser may
have skids).
DO NOT LAY MERCHANDISER OVER
ON THE FLOOR TO REMOVE SKID.
Once the skid is removed, the merchandiser
must be lifted —NOT PUSHED— to reposition.
To remove the skid, remove screws attaching
skid to the merchandiser.
Check floor where cases are to be set to see if
it is a level area. Determine the highest part of
the floor.
Do NOT remove shipping crate until the
merchandiser is positioned
for installation.
Do NOT stand or walk on top of
merchandiser. Do not store items or
ammable materials atop the unit.

1-4 InstallatIon
P/N 0515957_M U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
MERCHANDISER LEVELING
Besure to position merchandisers properly.
Level the merchandiser by all four corners.
Merchandiser(s) must be installed level to
ensure proper operation of the refrigeration
system, and to ensure proper drainage of
defrost water.
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.
REFRIGERATION UNIT ACCESS
The lower front panel may be removed by
lifting the panel straight upward and over
the tabs on which it is hanging. In a self con-
tained merchandiser, two screws will have to
be removed from either end of the panel. The
panel is installed by reversing the above proce-
dure. Ensure lower front panel is flat against
the floor when installed to prevent air circula-
tion problems on self contained merchandisers.
CASTERS
The merchandiser is equipped with optional
casters. Use the brake to lock the merchandiser
in place.
SEALING MERCHANDISER TO FLOOR
If required by local sanitary codes, or if the
customer desires, merchandisers may be sealed
to the floor using a vinyl cove base trim. The
size needed will depend on how much varia-
tion there is in the floor, from one end of the
merchandiser to the other. Sealing of the lower
front and rear panels on self contained mod-
els may hamper their removal for servicing or
maintenance of the condensing unit.
NOTE: Do not allow trim to cover any intake
or discharge grilles located in the lower front
panel.
Honeycomb Removal
Lower Front Panel Removal
Screw
Lower Front Panel
To Remove
To Install
Ensure lower front panel is flat against the floor when
installed to prevent air circulation problems on self-contained merchandisers.
The lower front panel may be removed by lifting the pane straight upward
and over the tabs on which it is hanging. In a self-contained merchandiser,
two screws will have to be removed from either end of the panel.
The panel is installed by reversing the above procedure.
Base
2. Push UP
and IN
1. Installed Location
Serial Plate
To lock

P/N 0515957_M 1-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers
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.
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 replacements made 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.

1-6 InstallatIon
P/N 0515957_M U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
Hussmann Self-Contained Refrigeration Equipment Start Up Check List
Hussmann Corporation, 12999 St Charles Rock Road, Bridgeton, MO 63044-2483 U.S.A.
Email: [e-mail] Fax: [phone]
Today’s Date
Store Name and Number
Store Address
Unit Model Number
Unit Serial Number
Contractor/Technician
Startup activity
Record date of completion or
requested data (i.e., voltage,
measurements, instrument readings).
Locate, read and maintain install/operation manual in a safe place for future reference.
Examine unit. Confirm there is NO damage or concealed damage.
Level the unit, side to side and front to rear.
Remove all shipping brackets/compressor straps/bolts etc.
Unit must be run on a dedicated electrical circuit without the use of an extension cord.
Record supply voltage at outlet with unit off.
Volts -
Verify refrigerant lines are properly secured and not touching or rubbing other lines, wires or frame work.
Verify fan motors and motor mounts are tight.
Verify fan blade/s are tight and are not rubbing/contacting other components.
Verify field and factory electrical connections are tight.
Verify electrical connections at lamps are tight and secure.
Verify all electrical wiring is secured and clear of any sharp edges or hot lines.
Verify there any no visible oil or refrigerant leaks.
Verify the condensate drain line is properly trapped and pitched.
What are the clearances on the sides and back of unit?
Left Side - Right Side -
Back - Top -
Are there any air disturbances external to the unit? Heat and air registers, fans, and doors etc.
Start up unit, record total unit amp draw after 5 minutes of operation.
Total unit amps -
Record compressor amp draw.
Amps -
Record anti-sweat heater amp draw if applicable
Amps - N/A
Record voltage reading with unit running.
Volts -
Verify condenser and evaporator fans are working
Is condenser air inlet or air exhaust restricted or recirculating?
Record ambient conditions around unit (wet Bulb temperature and dry bulb temperature) and RH%
Wet Bulb °F
Dry Bulb °F RH%
Record condenser air inlet temp (center of the coil)
°F
Record condenser air outlet temp(right after the fan motor)
°F
After unit reaches operating temperature, record unit discharge air temperature (center of the flue).
°F
After unit reaches operating temperature, record unit return air temperature(center of flue).
°F
Does unit controller operate properly? See controller or I/O manual for proper controller operation.
Record defrost heater amp draw (when applicable).
Amps -
Verify there are no visible water leaks.
Verify door switches work correctly, turning evap fans on and off.
Verify unit doors and lids work and are fully sealed.
Verify that all the panels, shields and covers are in place.
Confirm the unit has no vibrations or abnormal noise.
Advise owner/operator that merchandiser must operate at temperature for 24 hrs prior to loading with product.
Technician Notes:
Form HSCW01 Rev. 30MAY12 P/N 0525209_B
LEGAL DISCLAIMER:
Hussmann shall not be liable for any repair or replacements made 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 0515957_M 2-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers
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. All electrical connections (for
remote models) are to be made in the electrical
Handy Box located behind the removable base
panel at the left end of the merchandiser when
facing the discharge honeycomb.
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.
Self-contained models have
factory-installed power cords
attached at the electrical box.
REFRIGERATION
(Self Contained Models)
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 merchan-
diser refrigeration piping is leak tested. The
unit is charged with refrigerant, and shipped
from the factory with all service valves open.
ELECTRICAL / REFRIGERATION
ALWAYS CHECK THE SERIAL PLATE FOR
COMPONENT AMPERES
— LOCK OUT / TAG OUT —
To avoid serious injury or death from electri-
cal 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.
NEMA 6-20R
Receptacle
DDSS-4MC
Merchandiser must be grounded.
Do not remove the power supply cord ground.
Risk of Electric Shock. If cord or plug
becomes damaged, replace only with
a cord and plug of the same type.

2-2 ElEctrIcal / rEfrIgEratIon
P/N 0515957_M U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
WATER OUTLET AND WATER SEAL
The condensate water outlet is located in the
center of the merchandiser. The outlet has an
external water seal installed from the factory.
This water seal drains into the condensate
evaporation pan located beneath the merchan-
diser. Remote models have a fan to circulate
air around the base to keep condensation from
forming.
NOTE: All lower base panels must be in place
when the refrigerator is operating. If not,
airflow from the condenser (self-contained)
will be directed over the evaporation pan and
defrost water in the pan may overflow.
When brazing pipes, be sure to use the
insulation blanket shipped with the
merchandiser to prevent damage to the
metal merchandiser bottom.
Refrigeration lines are under pressure.
Refrigerant must be recovered before
attempting any connection or repair.
Product will be degraded and may spoil if
allowed to sit in a non-refrigerated area.

P/N 0515957_M 3-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers
START UP / OPERATION
CONTROLLER OPERATION
The electronic controller is located in the cas-
sette 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 recepta-
cle.
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 evapo-
rator 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 re-
frigeration cycle of the Set-Point and it’s Dif-
ferential. The most accurate temperature on
a cabinets operation is to verify the product
temperature.
Taking as an example a VRL case, freezer, If
the Set-Point is -12°F and the Differential is
9°F. (Set-Point) -12°F + 9 (Differential) = -3°F.
The compressor and evaporator fan(s) will cycle
off -12°F and back on at -3°F.
Main Features:
• Panel-mounted
• Energy saving algorithms and optimised de-
frost 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
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

3-2 start Up/ opEratIon
P/N 0515957_M U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
Key Functions:
• 2 ON/OFF regulators for HOT/COLD
• Single defrost and double evaporator
(heatings, modulated heaters, reverse cycle, hot gas)
• Evaporator fans and condenser fans
• Frame Heater
• AUX
• Light
• Door switch
• ON /OFF
• Deep cooling cycle
• Day / Night
• Diagnostics
• “Easy Map” programming
• Programmable inputs/outputs
• LINK2 local area network
• RS485 communication protocol: Modbus
• Compatible with Device Manager (DM)
• Compatible with Unicard and Multi-function key
RTN400 Page 7/130
2 - SPECIFICATIONS
TECHNICAL DATA
Classification: electronic automatic control (not safety) device for incorporation
Mounting: panel mounting
Type of action: 1.B
Pollution class: 2
Material class: IIIa
Overvoltage category: II
Nominal pulse voltage: 2500V
Temperature: Use: –5 … +55°C - Storage: -30 … +85°C
Power supply: SMPS 100-240Va ±10% 50/60 Hz
Power consumption: 5.5W max
Fire resistance category: D
Software class: A
RTC battery life: In absence of external power, the clock battery will last 3 years.
FURTHER INFORMATION
INPUT CHARACTERISTICS
Measurement range: NTC: -50.0°C ... +110°C; PTC: -55.0°C ... +150°C; PT1000: -60.0°C ... +150°C
(on 3-digit display with +/- sign)
Accuracy: ±1.0° for temperatures below -30°C
±0.5° for temperatures between -30°C and +25°C
±1.0° for temperatures above +25°C
Resolution: 1 or 0.1°C
Buzzer: NO
Analogue/Digital Inputs: 5 configurable NTC/PTC/PT1000/DI inputs
1 multi-function, voltage-free digital input (D.I.)
OUTPUT CHARACTERISTICS
Digital Outputs: OUT1: 1 SPST relay: 2HP max 240Va
OUT2: 1 SPDT relay: 1HP max 250Va
OUT3: 1 SPDT relay: 8(4)A max 250Va
OUT4: 1 SPST relay: 8(4)A max 250Va
OC (Open Collector) Output: OC: 1 multifunctional output: 12Vc 20mA
MECHANICAL CHARACTERISTICS
Dimensions: 121x92 mm
Terminals: faston and screw for wires with cross-section of 2.5mm2
TTL for Unicard / Device Manager connection (via DMI)
Usage / Storage: 10...90% RH (non-condensing)
Connectors:
Humidity:
REGULATIONS
Electromagnetic compatibility: The device complies with Directive 2004/108/EC
Safety: The device complies with Directive 2006/95/EC
Food Safety: The device complies with standard EN13485 as follows:
• Suitable for storage.
• Application: air.
• Climate range A
• measurement class 1 in the range from -25°C to 15°C (*)
(* with Eliwell probes only)
NOTE: The technical specifications stated in this document regarding measurement (range, accuracy, resolution, etc.) refer to
the instrument alone and not to any accessories provided, such as the probes.
This means, for example, that the error introduced by the probe must be added to the error of the instrument.

P/N 0515957_M 3-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers
RTN400 Page 7/130
2 - SPECIFICATIONS
TECHNICAL DATA
Classification: electronic automatic control (not safety) device for incorporation
Mounting: panel mounting
Type of action: 1.B
Pollution class: 2
Material class: IIIa
Overvoltage category: II
Nominal pulse voltage: 2500V
Temperature: Use: –5 … +55°C - Storage: -30 … +85°C
Power supply: SMPS 100-240Va ±10% 50/60 Hz
Power consumption: 5.5W max
Fire resistance category: D
Software class: A
RTC battery life: In absence of external power, the clock battery will last 3 years.
FURTHER INFORMATION
INPUT CHARACTERISTICS
Measurement range: NTC: -50.0°C ... +110°C; PTC: -55.0°C ... +150°C; PT1000: -60.0°C ... +150°C
(on 3-digit display with +/- sign)
Accuracy: ±1.0° for temperatures below -30°C
±0.5° for temperatures between -30°C and +25°C
±1.0° for temperatures above +25°C
Resolution: 1 or 0.1°C
Buzzer: NO
Analogue/Digital Inputs: 5 configurable NTC/PTC/PT1000/DI inputs
1 multi-function, voltage-free digital input (D.I.)
OUTPUT CHARACTERISTICS
Digital Outputs: OUT1: 1 SPST relay: 2HP max 240Va
OUT2: 1 SPDT relay: 1HP max 250Va
OUT3: 1 SPDT relay: 8(4)A max 250Va
OUT4: 1 SPST relay: 8(4)A max 250Va
OC (Open Collector) Output: OC: 1 multifunctional output: 12Vc 20mA
MECHANICAL CHARACTERISTICS
Dimensions: 121x92 mm
Terminals: faston and screw for wires with cross-section of 2.5mm2
TTL for Unicard / Device Manager connection (via DMI)
Usage / Storage: 10...90% RH (non-condensing)
Connectors:
Humidity:
REGULATIONS
Electromagnetic compatibility: The device complies with Directive 2004/108/EC
Safety: The device complies with Directive 2006/95/EC
Food Safety: The device complies with standard EN13485 as follows:
• Suitable for storage.
• Application: air.
• Climate range A
• measurement class 1 in the range from -25°C to 15°C (*)
(* with Eliwell probes only)
NOTE
: The technical specifications stated in this document regarding measurement (range, accuracy, resolution, etc.) refer to
the instrument alone and not to any accessories provided, such as the probes.
This means, for example, that the error introduced by the probe must be added to the error of the instrument.

3-4 start Up/ opEratIon
P/N 0515957_M U.S. & Canada 1-800-922-1919 • Mexico 01 800-890-2900 • www.hussmann.com
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.

P/N 0515957_M 3-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. DDSS Open Vertical Merchandisers
RTN400 Page 16/130
LED
RTN400 family controllers will also function even if a keyboard has not been connected.
With KDEPlus or KDWPlus keyboards (which are the same and guarantee the same functions), the display will be as follows:
1
2
5
6
8
7
4
3
Meaning of LEDs:
No Icon LED Operation Meaning
1Compressor
Permanently on compressor on
Blinking Delay, protection or start-up blocked
OFF otherwise
2Defrost
Permanently on Defrost active
Blinking Activated manually or from Digital Input
OFF otherwise
3Fans Permanently on Fans active
OFF otherwise
4Reduced SET / Economy
Permanently on Energy Saving active
Blinking Reduced setpoint active
OFF otherwise
5Alarm
Permanently on alarm active
Blinking Alarm acknowledged
OFF otherwise
6°F readout Permanently on °F setting (dro =1)
OFF otherwise
7AUX
Permanently on Aux output active and/or light on
Blinking Deep cooling on
OFF otherwise
8°C readout Permanently on °C setting (dro = 0)
OFF otherwise
N.B.: When the instrument is powered on it performs a lamp test, during which time the display and LEDs will
flash for several seconds to check that they all function correctly.

3-6 start Up/ opEratIon
P/N 0515957_M 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