Hussmann NAV Series User manual

NAV & NAVC
Medium Temperature
Service Deli Self Contained
Merchandisers
Installation &
Operation Manual
P/N 2400204_H
April 2017
IMPORTANT
Keep in store
for future reference!
Spanish 0531301
French 0531302
®
Æ
MANUAL- IO NAV/NAVC SC

P/N 2400204_H 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 1-800-890-2900
www.hussmann.com
© 2017 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.

ANSI Z535.5 DEFINITIONS .............. vi
INSTALLATION
Certification ........................... 1-1
Hussmann Product Control .............. 1-1
Shipping Damage ...................... 1-1
Location .............................. 1-1
Self Contained (Location) ................ 1-2
Model Description ..................... 1-2
Unloading ............................ 1-2
Exterior Loading ....................... 1-3
Shipping Skid ......................... 1-3
Merchandiser Leveling .................. 1-3
Optional Legs ......................... 1-3
Serial Plate Location .................... 1-4
Light Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Refrigeration Unit Access ................ 1-4
Sealing Merchandiser to Floor ............ 1-4
Check List ............................ 1-5
ELECTRICAL / REFRIGERATION
Merchandiser Electrical Data ............. 2-1
Field Wiring ........................... 2-1
Electrical Connections . . . . . . . . . . . . . . . . . . . 2-1
Power Input ........................... 2-1
Electrical Outlet ........................ 2-1
Refrigeration (Self Contained) ............ 2-2
Waste Outlet .......................... 2-2
Operating Safe-NET III Controls ..........2-3
Start-Up / Operation .....................2-4
Alarms and Codes .......................2-4
Troubleshooting .........................2-4
Defrost Termination Switch ...............2-5
Manual Defrost .........................2-5
Temperature Adjustment ..................2-6
Sequence of Operation ....................2-7
Safe-NET Sensor Location ................2-8
START UP / OPERATION
Start Up .............................. 3-1
Controls and Adjustments ............... 3-1
Load Limits ........................... 3-2
Stocking .............................. 3-2
Maximum Shelf Weight Limits ............ 3-3
Pencil Thermometer .................... 3-4
MAINTENANCE
Care and Cleaning ...................... 4-1
Cleaning Stainless Steel Surfaces .......... 4-2
Cleaning Pencil Thermometer ............ 4-2
Cleaning the Bottom Deck ............... 4-3
Cleaning Coils ......................... 4-3
Cleaning Evaporation Pan ............... 4-4
Removing Scratches from Bumper ......... 4-4
Refrigeration Equipment Maintenance
Check List..............................4-5
SERVICE
Replacing Display Lamps ................ 5-1
Troubleshooting Guide .................. 5-1
Troubleshooting Light Guide ............. 5-2
APPENDIX
Parts List ............................. A-1
Plan Views ............................ A-3
Cross Sections and Refrigeration Data ...... A-5
Defrost Data .......................... A-5
Physical Data .......................... A-5
Electrical Data ......................... A-6
Shipping Weights and Amps . . . . . . . . . . . . . . A-7
Wiring Diagrams ....................... A-8
WARRANTY
TABLE OF CONTENTS v
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Service Deli Merchandisers

REVISION HISTORY
REVISION H — COVER - DOE 2017 COMPLIANT
A-2 - REMOVE 1700502 & 1804576 MOTORS, REPLACE
WITH 0527610- CONDENSER FAN MOTOR (115V, 12W,
SSC2B12CHSIBA1) ON THREE MODELS
A-6 - REFRIGERANT CHARGE: ADD FOR WHICH
MODEL IS EACH CHARGE: NAV/C-4 14.5 OZ, NAV/C-6
20 OZ, NAV/C-8 23 OZ
A-7 - UPDATE ENERGY CONSUMPTION VALUES ON
NAV/C-4 FROM 5.77 TO 5.33 AND NAV/C-8 FROM 8.90
TO 8.39
REVISION G — Changed ambient temp in box; 1-1
iii — changed to pre-chilled; Added Section 2 Safe-NET;
3-1 Controls and Adjustments Table; 5-1 LED lamps;
A-5 Defrost Data; A-6 lamp data; Energy Consumption
A-7; New Wiring Diagram and Parts List
REVISION F — Added Check Lists Page 1-7; Added
Warning Page 1-3; Cleaning Coils 4-3; Maintaining
Fluorescent Lights 4-4, Check Lists Page, 4-6
REVISION E — JANUARY 2011
1. Added Location Drawing, Page 1-2
2. Added Light Switch, Refrigeration Unit Access,
Page 1-4
3. Added Appendix A, Technical Data
vi
* * * * * * * * * * * * * * * * * * * * * * * * * *
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 2400204_H U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com

P/N 2400204_H 1-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Service Deli 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. A Type II fan speed control
kit is required for each merchandiser 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
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 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) and 75°F (23.9°C).
Maximum relative humidity is 55%.

1-2 InstallatIon
P/N 2400204_H U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
SELF CONTAINED (LOCATION)
NAV and NAVC merchandiser models have
front-facing condenserair intake and air
discharge. Maintain a minimum clearance
distance of 2 feet in front of the merchandiser
and 4 inches on each side, so that air discharge
and air intake are not obstructed.
24 in.
Air
Intake
Air
Exhaust
Front Rear
Maintain 4 in. Clearance
around Sides and Rear
Maintain 24 in. Clearance
at Front
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 consid-
ered more of a ‘right to know’ law than a pure
product safety law. When used as designed, Huss-
mann 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 2400204_H 1-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Service Deli Merchandisers
MODEL DESCRIPTION
NAV/C service deli merchandisers offer
versatility in the display of medium
temperature (32º F to 41º F) products such
as dairy products, prepared salads, pizza and
fresh dinners that are pre-chilled in a cooler.
Carefully read and follow the instructions
before operating the merchandiser.
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, J-bar, Lever
Dolly, or Pry Lever.
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 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.
Do not remove the shipping skid until the
merchandiser is near its final location.
The skid provides protection for both the
merchandiser and the floor.
Remove the skid by raising one end of the
merchandiser approximately 6 inches. Block
the merchandiser securely, and remove the two
skid bolts from the raised end. Replace the
bolts with (provided) leg levelers. Repeat this
procedure at opposing end. Once the leg levelers
are secured in place, the merchandiser may be
slid off the skid and placed in its final location.
DO NOT TILT MERCHANDISER ON ITS
SIDE OR END WHEN REMOVING SKID.
Once the skid is removed, the merchandiser
must be lifted —NOT PUSHED— to reposition.
Check floor where merchandisers are to be set
to see if it is a level area. Determine the highest
part of the floor.
Do NOT stand or walk on top of
merchandiser. Do not store items or
ammable materials atop the unit.

1-4 InstallatIon
P/N 2400204_H U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • 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.
OPTIONAL LEGS
NSF® approved legs replace the leg levelers if
required by local health codes. The legs raise
the case 6 inches for cleaning purposes. An
optional skirt kit can be provided to snap on
the legs.
SERIAL PLATE LOCATION
The serial plate is located in the top interior at
the left side of the merchandiser. It contains all
pertinent information such as model, serial
number, amperage rating, refrigerant type
and charge. This information will be needed
to maintain, service or order parts for the
merchandiser.
LIGHT SWITCH
The light switch is located at the rear of the
merchandiser. Ensure it is switched ON to turn
on the display lights.
Serial Plate
Light Switch
Do NOT remove shipping crate until
the merchandiser is positioned
for installation.
NAV-4
CONDENSING
UNIT
EVAPO RATO R
COIL

P/N 2400204_H 1-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Service Deli Merchandisers
REFRIGERATION UNIT ACCESS
The lower front panel may be removed by
lifting the panel upward and over the tabs on
which it is hanging. The panel is replaced by
reversing the above procedure.
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 variation
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 models
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.
Lift up and
out to remove
access panel
First
Then
NAV-4

1-6 InstallatIon
P/N 2400204_H U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • 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. Conrm 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 eld 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 writtenconsent of Hussmann, orwhen the productis installed or operated in a manner
contrary to the printed instructions covering installation and service which accompanied such product.

P/N 2400204_H 2-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Service Deli Merchandisers
MERCHANDISER ELECTRICAL DATA
Refer to Appendix A of this manual or the
merchandiser’s 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.
POWER INPUT
NAV / NAVC merchandisers are provided
with 3-Amp power receptacles. Electrical
equipment connected to the receptacle
must not exceed 3 amps. The receptacle is in
series with a GFCI safety device.
NAV / NAVC merchandisers do not have a
power switch. Once power cord is connected
to power, the merchandiser is energized.
The refrigeration thermostat has an OFF
position that disconnects power to the
condensing unit only.
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 merchandis-
er. 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.
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.
R20R
6 &
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 2400204_H U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
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.
NAV/C models have a refrigeration system
that uses a hermetic compressor and a
capillary tube for refrigerant control. The
capillary tube is soldered to the suction line
pull-out coil for proper heat exchange. If the
capillary should become plugged or damaged, it
is best to replace the heat exchanger.
WASTE OUTLET
For self contained models like NAV / NAVC,
condensate waste from defrost, drains into a
condensate pan located beneath the merchandiser.
The condensate pan has a hot gas loop that
evaporates waste. Ensure the drain hose is
properly trapped, and the drain area is not
clogged. Ensure waste outlet cap is fitted
securely in place.
Waste Outlet
NOTE: All lower base panels must be in place
when the merchandiser is operating. If not, air-
flow from the condenser will be directed over the
evaporator pan and defrost waste in the pan may
overflow.
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.
When brazing pipes, be sure to use the
insulation blanket shipped with the
merchandiser to prevent damage to the
metal merchandiser bottom.

P/N 2400204_H 2-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Service Deli Merchandisers
OPERATING Safe-NET III CONTROLS
The Safe-NET III electronic temperature and
defrost controller is located in the cassette
compartment. The controller comes factory set
at position #5 and is ready to go.
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.
The temperatures can be adjusted by rotating
the knob counter-clockwise for a warmer set-
point, or clockwise for a colder setpoint. The
display shows the setpoint for a few seconds
when changed, then reverts to showing the
sensed temperatures in the merchandiser.
The adjustment knob allows the user to select
a pre-configured cold setpoint, warm setpoint
or any setpoint within this range. The adjust-
ment knob is also configured with off/on
functionality to power off the controller. The
off position shuts off the compressor only.
UNPLUG THE UNIT FOR SERVICE.
The top, or green, LED indicates the case is in
refrigeration mode. The center, or yellow, LED
indicates the case is in defrost mode. The bot-
tom (red) LED indicates an alarm condition,
such as merchandiser warming up because the
door is not closed.
Remove Plastic Screws
Safe-NET III Indicators
Compressor
Powered on
GREEN
Defrost Cycle
YELLOW
Alarm
RED
Off / On Position
Position #5

2-4 ELECTRICAL / REFRIGERATION
P/N 2400204_H U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
START-UP / OPERATION
The defrost cycle is initiated at power on. (This
cycle will quickly terminate on the initial start-
up of a warm merchandiser.) Another defrost
cycle will follow every 8 hours thereafter. The
defrost times will reset whenever power is inter-
rupted. Therefore, the standard defrost times
can be reset by interrupting power (full stop,
then start) at the desired time. This will reset
the initial time and restart the 8-hour cycle.
During the compressor-on time (1 minute),
or compressor-off time (2 minutes), built-in
protection time will delay the defrost initiation.
If you force a defrost cycle during this time,
the feature will initiate but not start until the
compressor protection mode times out.
ALARMS AND CODES
Safe-NET III is available with an audible
alarm (located in the display module) that
sounds in the event a failure occurs.
flashing temperature or sensor alarm
led, e1 or e2
If the Temperature or Sensor Alarm LED (red)
on the controller and display is flashing, a
temperature sensor has failed (or sensor is
disconnected). The display shows E1 if the case
sensor has failed (or disconnected) or E2 if the
evaporator sensor has failed (it is disconnected).
If the merchandiser sensor fails, refrigeration
will run continuously. Turn off, or repeat a
duty cycle of a few minutes on and a few
minutes off.
TROUBLESHOOTING
Alarm
or Code Indicates Action
Red LED • Firmware • Call Service
remains ON corruption on immediately
after startup controller
• Controller is
not operating
Red LED turns • Case • Make sure the door
on during temperature is closed
operation is too warm • Make sure that cold
or too cool air is not being
blocked or deflected
• Check the
temperature using
the optional display
or a thermometer
• If the LED does not
turn off after an hour,
call Service
Red LED • Temperature • Check the optional
flashes sensor failure display for error code
• E1 indicates E1 or E2 and call
a case Service immediately
temperature
failure
• E2 indicates
an evaporator
temperature
sensor failure

P/N 2400204_H 2-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Service Deli Merchandisers
DEFROST TERMINATION SWITCH
Merchandisers may use a defrost termination
switch, instead of an evaporator sensor to
terminate a defrost cycle. The defrost
termination switch is temperature activated
and senses the completion of defrost.
MANUAL DEFROST
Note:
This procedure initiates
a manual or forced
defrost.
IMPORTANT:
Return the control knob to its original setting
(Step 1) once the manual defrost has been ini-
tiated.
On
Off Time
Off OnOff On
Compressor
Off Time If
Sensor Failed
Compressor
On Time If
Sensor Failed
Compressor or
Refrigeration
Status
1
2
3
4
5
6
7
I
I
Warm Cold
Rotate knob fully
counterclockw ise
until it stops (full
2.
1
2
3
4
5
6
7
I
I
Warm Cold
Note location of
knob setting
1.
1
2
3
4
5
6
7
I
I
Warm Cold
3.After 10 seconds, but
before 20 seconds,
rotate knob fully
clockw ise until it
stops (full cold position)

2-6 ELECTRICAL / REFRIGERATION
P/N 2400204_H U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
TEMPERATURE ADJUSTMENT
1. Rotate the adjustment knob counter clock-
wise for a warmer setpoint or clockwise for
a colder setpoint.
2. While adjusting the temperature, the display
shows the setpoint (cut out value). A few
seconds after the temperature is set, the
controller reverts to the sensed temperature
in the merchandiser.
3. To verify merchandiser settings, turn the
dial to warm and cold as shown above.
Output readings should be within one
degree of the temperatures shown above.
The control has protective settings to prevent
short cycling of the compressor.
A. The compressor may run for up to 60 sec.
after Step 2 is completed. Start the 10 sec.
count down for Step 3, once the display is
blank.
B. The defrost initiation may be delayed for
up to 120 sec. after Step 3 is completed.
7
6
COLDWARM
1
2
4
3
5
Display - at Full Cold
Model LTH
Display - at #1 Position
Model LTH
7
6
COLDWARM
1
2
4
3
5
"OFF" PositionSafe-NET III Control
Set at Full Cold Position
Safe-NET III Control
# 1 Position

P/N 2400204_H 2-7
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Service Deli Merchandisers
Sequence of Operation — LTH Merchandisers
1NOTE: The 65°C Version Controller includes a Parameter Code Number. This number indicates what program has been
loaded into the controller. When the Controller is first powered up or is turned off and then back on a 2 digit Parameter
Code Number will display for 3 seconds. Then the Self Check will Start.
1a. The Safe-NET Parameter Code is for NAV cases is 57.
If the case is warm at initial start-up, the defrost will be initiated and will terminate almost immediately. (Display will lock in
current temperature when defrost is initiated.)
1b. If the case is cold (as if it is turned off and then back on), the defrost cycle will continue until the termination
temperature is reached or the fail-safe time has expired.
2The compressor will start 10 seconds after the power is applied.
3The compressor will run for 10 minutes. Then, defrost will be initiated.
4During defrost, the display will show the temperature before defrost, and it will continue to show this
temperature for 1 hour. Compressor will turn back on once coil is defrosted.
5The compressor will continue to run until it reaches its cut-out temperature (pull down).
6 The refrigeration cycle will continue until the next scheduled (8 hours) or demand defrost.
7 3and 4will repeat until power is interrupted.
NOTE: If power is interrupted, sequence will start at 4. Defrost will be initiated and the time to subsequent
defrost will reset.

2-8 ELECTRICAL / REFRIGERATION
P/N 2400204_H U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
Safe-NET SENSOR LOCATION
Yellow Defrost Sensor is centered between the
wall and evaporator with adhesive patch and
plastic belt.
The Black Ambient Sensor is inside the PVC
tube between the evaporator and the roof
drain assembly.
Yellow Defrost Sensor
Black Ambient Sensor
Defrost Sensor
(Yellow)
Defrost Termination
Sensor (Yellow Lead)
Detail A