Hussmann RFLNS Installation Manual
RFLNS & RFMNS
®
Freedom Line
Low or Medium Temperature
Compressor Ready
Narrow Footprint
Reach-in
Merchandisers
IMPORTANT
Keep in store for
future reference!
MANUAL - I/O FREEDOM RFLNS & RFMNS
Installation &
Operation Manual
Shipped With Case Data Sheets
P/N 0539221_H
July 2015
Spanish P/N 0541249
French P/N 0541252
P/N 0539221_H iii
®
TABLE OF CONTENTS
INSTALLATION
NSF Certication ..................... 1-1
Freedom Line Description
Location
............................. 1-1
.............. 1-1
Shipping Damage ...................... 1-2
Exterior Loading ...................... 1-2
Moving Merchandisers (Narrow Entrance) . 1-2
Merchandisers Shipped with End Installed .. 1-2
Optional Forklift Pockets ............... 1-3
Shipping Braces ....................... 1-3
Leveling ............................. 1-4
Door Adjustment . . . . . . . . . . . . . . . . . . . . . . 1-6
Joining .............................. 1-6
REFRIGERATION / ELECTRICAL
/ SAFE-NET III
Refrigerant ........................... 2-1
Field Installation of Condensing Unit ..... 2-2
About Quick Connect Couplings .......... 2-5
Connect Lines ........................ 2-5
Insulate Refrigerant Lines ............... 2-5
Field Wiring .......................... 2-5
Safe-NET III User Instructions ........... 2-8
Display ..............................2-9
Start-Up .............................2-9
Safe-NET location .................... 2-10
Sequence of Operation ................2-11
Temperature Adjustment .............. 2-12
Alarms and Codes .................... 2-12
Manual Defrost ...................... 2-12
Merchandiser Electrical Data ........... 2-13
Electrical Connections ................. 2-13
Identication of Wiring ................ 2-13
Controls and Adjustments ............. 2-14
FACADE AND SPLASHGUARDS
Install Facade
Air Flow Bafe
........................3-1
....................... 3-3
Installing Splashguards and Brackets ...... 3-4
Sealing Splashguard to Floor ............ 3-5
Installing Bumpers ..................... 3-6
START UP / OPERATION
Expansion Valve Adjustment ............ 4-1
Prior to Start Up Checklist .............. 4-2
Start Up Checklist ..................... 4-2
Defrost .............................. 4-3
Safe-NET III Control Settings
and Operation ........................ 4-3
Checklist After 12 Hour Run Time ........ 4-3
Load Limits .......................... 4-4
Stocking ............................. 4-4
Installing FDA/NSF
Required Thermometer ................ 4-4
MAINTENANCE
Care and Cleaning ..................... 5-1
Cleaning Condensate Float Switch ........ 5-2
Cleaning Condensate Pump & Pan ........ 5-3
Cleaning Honeycomb Assemblies ......... 5-4
Cleaning Stainless Steel Surfaces .......... 5-4
Cleaning Coils ........................ 5-4
Cleaning Under Merchandisers .......... 5-4
Removing Scratches from Bumper ........ 5-4
Top Mount Cleaning & Maintenance ...... 5-5
SERVICE
Replacing Fan Motors and Blades ........ 6-1
Replacing Electric Defrost Heaters ........ 6-2
Replacing Drain Pan Heater Elec & Gas .... 6-3
Replacing Damaged Drain Fitting ........ 6-3
Repairing Aluminum Coil ............... 6-4
OPTIONAL DRIP PIPING
Waste Outlet and Water Seal ............ 7-1
Installing Drip Piping
.................. 7-1
WARRANTY
IMPORTANT
KEEP IN STORE FOR FUTURE REFERENCE
Quality that sets industry standards!
12999 St. Charles Rock Road • Bridgeton, MO 63044-2483
®
®
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www.hussmann.com
© 2015 Hussmann Corporation
iv Contents
REVISION HISTORY
REVISION H - JULY 2015
Revised checklist GFCI, Page 4-3
Revised Connect lines and Refrigerant Lines,
Page 2-5
REVISION G – March 2015
Removed references on page 3-3 and 5-3
REVISION F – February 2015
Clearance, Page 1-1
REVISION E – October 2014
Added California Warning Page 1-2;
Installing Air Flow Bafe Page 3-3.
Revised fork life pockets, Page 1-3
End photos and text, Page 1-6
Rear Bracket, Page 2-2 Detail A text, Page 2-4
text, Page 2-7 Photo removed Page 3-1, 3-2, changed
page 3-4, New Optional Drip Pipe Section 7
* * * * * * * * * * * * * * * * * * * * * * * * * *
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.
REVISION D – July 2014
Updated Cover Photo
REVISION C – July 2014
Original Issue
P/N 05339221_H
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P/N 0539221_H 1-1
INSTALLATION
NSF CERTIFICATION
These merchandisers are manufactured to
meet ANSI / National Sanitation Foundation
®
(NSF
) Standard #7 requirements. Proper installation is required to maintain certication.
Near the serial plate, each case carries a label
identifying the type of application for which
the case was certied.
ANSI/NSF-7 Type I – Display Refrigerator / Freezer
Intended for 75°F / 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
FREEDOM LINE DESCRIPTION
The Freedom Line RFLNS and RFMNS cases
are designed to be ready for remote installation
of a top-mounted air-cooled condensing unit,
such as Hussmann’s TCLSA through TCMSD
series of condensing units. They are controlled
by the Safe-NET III electronic control. The
case temperature is controlled by cycling the
compressor based on the discharge air
temperature input. The sensor for this input
is located above the discharge air honeycomb.
Another sensor, located on the bottom center
evaporator coil return bends is used for defrost termination. The Safe-NET III control is
pre-programmed for both ice cream and frozen
food operation and is adjusted for the required
temperature by the control knob located on the
front of the controller, which is on top of the
case.
Cases running on individual condensing units
may be installed as stand-alone cases with ends,
or as a part of a lineup.
When installed in a lineup, Hussmann recommends that partitions be installed between
individual cases to prevent frost buildup and
other issues that might result from different
defrost schedules and operating temperatures.
These partition may be acrylic or insulated,
depending on case’s operating temperature.
LOCATION
These merchandisers are designed for displaying
products in air conditioned stores where
temperature is maintained at or below the
ANSI/NSF-7 specied 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 efciency. Like other
merchandisers, these 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 merchandisers.
To prevent sweating on the exterior surfaces
of merchandisers, there must be
clearance of 4 inches (102 mm) between
a minimum
the merchandisers and other xtures or walls.
A 5.5 inch (140 mm) space is required between
facade top and the ceiling. A louvered Facade
Panel kit is available that will allow for a top
spacing minimum clearance of 3 inches (76
mm).
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.
Condensing units installed on top of the
merchandiser require air circulation to operate
properly. Blocking or restricting air ow will
adversely affect performance and may damage
the refrigeration system.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
1-2 InstallatIon
If the ceiling and/or walls are built up around the
merchandiser, allow for a sufcient gap above or
behind the merchandiser to provide adequate air
circulation. When merchandisers are installed in
a lineup, case must be taken to ensure that warm
condenser air is not blown from one unit into the
condenser of the adjacent unit.
For California Businesses:
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 claried 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.
Do not store items or ammable
materials atop the unit.
Do not walk on case.
Concealed Loss Or Damage
When loss or damage is not apparent until after
equipment is uncrated, a claim for concealed damage is made. Upon discovering damage, make
request in writing to carrier for inspection within 15
days and retain all packing. The carrier will supply
inspection report and required claim forms.
EXTERIOR LOADING
Do NOT walk on top of merchandisers or damage to
the merchandisers and serious personal injury could
occur.
supporT excessive exTernal loading such as the
weight of a person. Do not store items or ammable materials atop the case.
MOVING MERCHANDISER THROUGH
NARROW STORE ENTRANCES
Door handles may be disassembled for transit access through
small doors or passage ways.
The minimum door opening is
36 in. x 80 in.
The door handles can be removed for narrow store
entrances.
They are noT sTrucTurally designed To
Remove
Screws from
Door Handle
MERCHANDISERS SHIPPED WITH END
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.
INSTALLED
If the case was shipped with the end installed, two
long bolts were used to hold the shipping brace to
the end. If the shipping bolts are reinserted after
removing the brace, they will extend into the product area and may damage the coil.
be sur e To rep l ace Thes e bo l Ts w iTh The
sh orTe r bo l Ts p rovi ded.
Th eref o re,
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. The carrier will supply necessary
Be careful not to damage the factory-installed end
while moving the merchandiser. Make sure that
tools are positioned past the end and beneath the
merchandiser’s support bar.
forms.
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P/N 0539221_H 1-3
OPTIONAL FORKLIFT POCKETS
Underneath the case there are pockets where
the forks of a forklift can be inserted to move
the case into the store. Ensure forks are inserted
through all four pockets prior to moving the
merchandiser. These shipping pockets (if ordered with the case(s)) can be used to bring the
Ensure the forks are inserted all the way
through all four pockets before lifting the
case. Case tipping could cause personal
injury and / or damage to the equipment.
merchandiser into the store and place it to its
nal location.
Optional Fork
SHIPPING BRACES
Lift Pockets
Move the merchandiser as close as possible
to its permanent location and then remove all
packaging. Check for damage before discarding
packaging. Remove all separately packed accessories such as kits and shelves.
Locate the shipping block in the center of the
heat exchanger (see illustration), and remove it
before piping the merchandiser. This block was
installed to minimize shipping vibration.
Remove the bottom display pans and air return
grilles from the case(s).
Shipping
Block
Top View of Merchandiser
Heat Exchanger
Front Shipping Brace
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
1-4 InstallatIon
LEVELING
Merchandisers must be installed level to ensure proper operation of the refrigeration
system and to ensure proper drainage of
defrost water. When leveling merchandisers,
use a carpenter’s level as shown.
Metal leveling shims or wedges are provided
with each merchandiser for use if needed.
NOTE:
hI g hest p oInt o f the stor e floo r .
Be g In lI n eup l evelI n g fro m the
Place shims under the rail and make sure
that they are positioned at a base component
(crossbar). This transfers the weight directly
from the loaded case through to the oor.
See illustrations on next page
Placing shims at other locations will cause
uneven distribution of weight leading to
piping leaks, as well as sagging or wracked
doors.
Case Leveling
Shim Case
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P/N 0539221_H 1-5
Approximately
Centered
Rear of Reach-In
Base
Component
Base Component
If any of the Earthquake Shoes are not in contact with the floor,
these Earthquake shoe locations must be shimmed, using
provided shims
4-Door Merchandiser Shown
No Gap
between
earthquake
Skid External Base
shoe and the
oor
Shim HereShim Here
Shim
Locations
Earthquake
Shoe
Correct Shim Location is Critical
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
1-6 InstallatIon
DOOR ADJUSTMENT
After leveling and joining the merchandisers,
adjust and level doors according to manufacturer’s
instructions shipped with each product. Factory
settings may be lost due to vibration during
shipment.
JOINING
Sectional construction means that two or more
merchandisers may be joined in line yielding
one long continuous display requiring only one
pair of ends. Joining kits and instructions are
shipped with each merchandiser.
To join merchandisers with independent ends,
a joining kit is required.
The painted caps for the end assembly bolt holes
may be kept with this manual. Insert two insulating plugs into each bolt hole of the ends to be
joined. After leveling and aligning the top edge
of the ends, install the two case-to-case brackets
on to the top with sheet metal screws as shown
below.
To join unlike xtures, or like xtures operating
at different temperatures, a 2inch (51mm)
partition kit is required. To join same temperature
merchandisers on different defrost cycles, a
plexiglass partition kit is required. Install ‘J’
trim between cases.
all joinTs musT be
air-TighT To prevenT
formaTion of ice
or condensaTion.
Use J-Bar to Align Cases for Joining
Remove Top Panel
Case End Cap
Bolt Hole
Locations
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P/N 0539221_H 2-1
REFRIGERATION / ELECTRICAL / SAFE-NET III
REFRIGERANT
The correct type of refrigerant will be stamped
on each merchandiser’s serial plate. The serial
plage is located on the left-hand end of the
interior top liner.
When brazing pipes be sure to use the
insulation blanket shipped with the
merchandiser to prevent damage to
the plastic case bottom.
Refrigeration lines are under pressure.
Depressurize and recover refrigerant before
attempting any connection or repair.
Refrigerant vapor is hazardous to your health
and can cause death. Avoid breathing refrigerant and lubrication vapor or mist. Exposure
may irritate eyes, nose and throat. If accidental system discharge occurs,ventilate work
area before resuming service.
Always wear safety goggles and protective
gloves when working with refrigerants. Contact
with refrigerant may cause injury. Disconnect
hoses with extreme caution! All hoses may
contain liquid refrigerant under pressure.
Be sure that any room where you are working
is thoroughly ventilated, especially if a leak is
suspected.
Read all safety information regarding the safe
handling of refrigerant and refrigerant oil, including the Material Safety Data Sheet. MSDS
sheets can be obtained from your
refrigerant supplier.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
2-2 RefRigeRation/electRical/Safe-net iii
FIELD INSTALLATION OF CONDENSING UNIT
A mounting plate is provided on top of the
case with pilot holes that provide specic
attachment points for the condensing unit
base. The mounting plate is located above the
next to last door on the right.
Condensing Unit
The condensate pan, if selected by the end
user, is packed inside the case and must also
be installed and leveled on top of the case,
then plugged into the 120V GFCI outlet
provided.
Exact component location is not critical;
however, the components should be mounted
in the general locations shown below to ensure that electrical connections reach, and the
condensate pan has adequate air ow from the
condenser.
Insulation Sponge 5/8 inch x 3/4 inch wall
insulation to cover entire length from
Condenser Unit connection to end
of copper tubing, where it enters at
top of case, including quick connects
Facades
Right side of case
looking from the front
Orient the Condenser Unit as shown on top
of the case. Line up mounting holes on base
of condenser unit with holes on mounting
plate and secure using (4) 12-14 x 2 1/4 inch
screws and flat washers
Apply Rubber Gasket along base edges that
contact mounting plate (8) places (2 each
side) as shown
Rear Bracket used on 4 & 5 Door Cases Only.
Sound Panel Kits Use Similar Bracket For 3
Door Cases.
Connect quick connects on flexible liquid &
suction lines from condensing unit to quick
connects on pipes exiting top right of case
5-Door Case & Condenser Unit Shown
P/N 0539221_H
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P/N 0539221_H 2-3
The wiring connection for the condensing unit
is provided with 5-ft leads. The conduit must
be connected to the condensing unit electrical box, and the leads are connected to the
condensing unit input terminals. The heated
condensate pan, if provided, is plugged into
the 120V GFCI receptacle at the top of the case.
To avoid serious injury or death from electrical
— LOCK OUT / TAG OUT —
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.
Blocked drain lines will cause water to back up
in the case and spill onto the floor, causing a
slip hazard.
TO TOP OF CASE
CONDENSATE EVAP PAN
DETAIL A
Detail A
COPPER TUBE
Copper Tube Condensate Pan
CONDENSATE PAN
CLAMP 3/8" COPPER TUBE
Clamp 3/8 inch
TO TOP OF CASE
copper tube to top
of case
ATTACH 3/8" TUBING TO
Attach 3/8 inch tubing to condensate
CONDENSATE PAN COPPER TUBE
USE TIE-RAP TO SECURE
pan copper tube use tie-rap to secure
CLAMP 3/8" TUBING
TO TOP OF CASE
Clamp 3/8 inch tubing to top of case
TUBING FROM CONDENSATE
Tubing from Condensate Pump is
PUMP MOUNTED TO BOTTOM OF CASE
mounted to bottom of Case
Condensate Evaporator Pan
A
to knockout
KNOCKOUT IN RACEWAY
Plug Condensate
PLUG CONDENSATE EVAP PAN
Evap Pan into GFCI
INTO GFCI OUTLET AS SHOWN
Outlet as Shown
Connector
in Wireway
CONNECTOR TO
Conduit PVC X-Flex from
Handy Box located at
CONDUIT PVC X-FLEX
FROM HANDY BOX LOCATED
bottom of Case
ON BOTTOM OF CASE
CLAMP CONDUIT PVC X-FLEX
Clamp Conduit PVC
X-Flex to top of Case
CLAMP CONDUIT PVC X-FLEX
Clamp Conduit PVC X-Flex
AND 3/8" TUBING TO REAR
FOAM PANELS AS REQUIRED
and 3/8 Tubing to rear foam
panels as required
Condensate Pan Installation and Location
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
2-4 RefRigeRation/electRical/Safe-net iii
Heated condensate pan
is to be plugged into GFCI
outlet, mounted on top,
EVAPORATOR TO BE
PLUGGED INTO GFCI OUTLET
MOUNTED ON TOP RIGHT SIDE
right side of wireway
OF RACEWAY
Position heated condensate pan to
Dimensions shown and install (4)
POSITION EVAPORATOR TO DIMENSIONS SHOWN
AND INSTALL (4) SM SELF-DRILL SCREWS INTO
SM Self-Drill Screws into Top Foam
TOP FOAM PANEL LINER
Panel Liner
A
View is looking at top of case, right side
Foam Seal must be in place, sealant must
be applied around the copper lines after
Condensate Pan Installation, Location and Electrical
VIEW LOOKING AT TOP OF CASE RH SIDE
connecting the condensing unit.
17 inches
17.00 APPROX.
(432 mm)
(approximate
APPROX.
Detail A
location)
9.00
(229 mm)
9 inches
ABOUT QUICK CONNECT COUPLINGS
Quick Connect ttings are provided on
both the case inlet and outlet lines, and on
Hussmann’s TCL and TCM series of condensing units. The case and condensing unit
are pre-charged with the correct amount of
R404A refrigerant, and the lines are sealed.
Connecting the Quick Connects together
breaks the seals to connect the refrigeration lines of the unit to the case. The Quick
Connects must be properly torqued to avoid
refrigerant leaks.
CONNECT LINES
Mount the suction line and liquid line to the
condensing unit. When ready to connect, remove protector caps and plugs from the Quick
Connect couplings.
If necessary, carefully wipe coupling seats and
threaded surfaces with a clean cloth to prevent
the inclusion of dirt or any foreign material in
the system.
Lubricate male half of diaphragm and
synthetic rubber seal with refrigerant oil.
Thread the coupling halves together by hand
to ensure proper mating of threads. Use
proper size wrenches (on coupling body hex
and on union nut) and tighten until coupling
bodies “bottom” or a denite resistance is felt.
Tighten a ¼ turn after the coupling bottoms
out to ensure a leak proof seal (equivalent to
the foot pounds shown below).
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P/N 0539221_H 2-5
Hex Wrench
Coupling Size
3
/8 in. Male
3
/8 in. Female
5
/8 in. Male 1 1/16 in.
5
/8 in. Female 1 5/16 in.
3
/4 in.
13
/16 in.
INSULATE REFRIGERANT LINES
Suction lines are insulated to prevent condensation; extra insulation is provided to
cover the eld connected tubing sections.
These exposed sections must be covered with
insulation. Check that all suction lines are
adequately covered with insulation from case
penetration to compressor; including suction
service valves as some insulation may have
been dislodged during shipping and installation. Do not locate the tubing above the
electrical box in order to prevent condensation
from dripping onto electrical components.
FIELD WIRING
All wiring must be in compliance with NEC
and local codes. Field wiring must be sized for
component amperes stamped on the serial plate.
Actual ampere draw may be less than specied.
A conduit whip is provided for the power
input (eld connection) of the 120V single
phase and 208/230V single phase power supply.
The terminal blocks are located inside the
wireway on top of the case. The wiring diagram
and circuit requirements are provided on the
Technical Data Sheets provided with the case
and condensing unit. The disconnect switch
that turns off power to all case components
and the condensing unit is on top of the case,
on the rear of the wireway. When this switch
is off, some electrical terminals in the case
wireway may be energized.
Coupling Foot Pounds
Size (Ft. Lbs.)
3
/8 in. 10-12
5
/8 in. 35-45
Compressor
Insulation
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
2-6 RefRigeRation/electRical/Safe-net iii
.75
Bottom RH View of Case RFLNS/RFMNS 4 Door
Handy Box Bracket
(Factory Installed)
Factory Installed
Condensate Reservoir
51.83
Conduit and Tubing to top of Case
60.50
Dimensions In Inches
Pump Mounting Bracket
(Factory Installed)
Conduit PVC X-Flex and
3/8 Inch Tubing
(Factory Installed)
1.25
.62
P/N 0539221_H
7.75
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P/N 0539221_H 2-7
Condensate Reservoir
Bottom RH View of Case RFLNS/RFMNS 5 Door
All Dimensions in Inches
Pump Mounting Bracket
(Factory Installed)
(Factory Installed)
at top of Case
Handy Box Bracket
(Factory Installed)
Conduit and Tubing
.62
1.25
Factory Installed
31.42
25.19
6.50
.75
8.32
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
2-8 RefRigeRation/electRical/Safe-net iii
SAFE-NET III™
TEMPERATURE AND DEFROST
CONTROLLER
SAFE-NET III™ USER INSTRUCTIONS
Your refrigerated case uses a Hussmann
Safe-NET™ III temperature and defrost
controller to precisely maintain the temperature and prevent frost buildup on the cooling
coil. LEDs indicate when the compressor or
refrigeration is on, when the case is in a defrost
cycle, if the temperature is outside the desired
range, or if there is a sensor failure.
An adjustment knob allows the temperature
to be set within the congured range and can
power off the controller and compressor. Your
controller has been custom-congured to provide the best temperature and defrost control
for your chilled or frozen food.
The front of the controller has an adjustment
knob and status LEDs. The back of the
controller has connections for sensors and
switched equipment.
Adjustment
Knob
Compressor Powered On
Temperature or Sensor Alarm
green
Defrost Cycle
yellow
red
Warm
Position
Off
Position
Cold
Position
The Safe-NET III controller includes the
following features and connections.
• Adjustment knob:
Adjusts the temperature setpoint.
Turn adjustment knob to OFF to turn off
refrigeration system. Unplug merchandiser
from power before servicing the unit.
Heater
E72R only
Case
Temperature
Sensor
Compressor
Fan
E72R only
Evaporator
Temperature
Sensor
Sensor and Switch
Common
Defrost
Termination
Switch (optional)
Power
Interface Box and
Copy Card TTL Connector
• Controller LEDs:
Compressor Powered On LED (green):
Lights while the compressor is running
or the refrigeration valve is open.
Defrost Cycle LED (yellow):
Lights while the refrigeration coil is defrosting.
Temperature or Sensor Alarm (red):
Lights if the temperature is too warm
or too cold. Flashes if a sensor fails.
• Audible Temperature Alarm (optional)
See page 2-8 for alarm settings.
• Rear connections:
– Case temperature sensor:
• Typically senses the temperature
of the air in the case.
Used by the controller to determine when
to power on or power off the compressor
or refrigeration.
– Evaporator temperature sensor:
• Senses the temperature of the
refrigeration coil.
Terminates a defrost cycle when
refrigeration coil ice melts.
– Compressor or refrigeration relay:
• Switches on the compressor or
refrigeration valve for cooling.
The evaporator fans remains ON when the
adjustment knob is in the OFF position.
P/N 0539221_H
U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • WWW.HUSSMANN.COM
P/N 0539221_H 2-9
DISPLAY
The display includes three red LEDs and two
digits for temperature, defrost status, and error
codes.
The three display LEDs are red; their behavior
matches the LEDs on the controller.
Compressor
Powered On
Defrost Cycle
Temperature or
Sensor Alarm
START-UP
The OFF Position does not disconnect line
voltage to the input terminal blocks.
1. After the toggle switch is turned on, fans and
lights will energize immediately.
2. After turning on the disconnect switch, wait
for the self check to complete. During the
self check, each LED ashes for one second,
then all LEDs turn on for two seconds. If
the LEDs do not ash, make sure the adjustment knob is not in the Off position.
• After the self check, all LEDs turn off
until the compressor starts. There may be a
delay before the compressor starts. If the red
Temperature or Sensor Alarm LED stays
on after the self check.
• The green Compressor Powered On LED
turns on when the compressor starts.
3. The compressor will continue to run until it
reaches its cut-out temperature (pulldown).
Door and frame anti-sweat heaters will
energize after the evaporator temperature
reaches a stable operating temperature, this
may take 30 minutes or longer.
Product will be degraded and may spoil if
allowed to sit in a non-refrigerated area.
NOTE: Do NOT load product until AFTER
merchandiser operates for 24 hours and reaches
desired operating temperature.
1. The merchandiser temperature displays at
startup. The initial defrost starts twelve hours
later. During defrost, the display shows “df.”
This reading will remain displayed during defrost
and until it times out, even though the refrigeration mode has been initiated. (The green LED
will be lit.)
2. The compressor will start after a 30 second delay
once power is applied.
3. The compressor will continue to run until it
reaches its cut-out temperature (Pulldown).
4. The refrigeration cycle will continue for the next
subsequent scheduled (24-hours) or demand
defrost.
5. The above process will repeat (steps3 and 4)
until the power is interrupted.
6. If power stops, the process will start over at step
1, and the time to subsequent defrost will reset.
7. Medium temperature is the same except for a
60-minute time terminated defrost
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
2-10 RefRigeRation/electRical/Safe-net iii
A
White
(Common for
Both Sensors)
#11 Not Used
White
(Common
Both Sensors #10)
Black (Air Sensor #8)
Black (Evaporator Sensor #9)
(Yellow Sheath)
Yellow Sensor: Defrost Termination (Evaporator)
Black Sensor: Control (Air)
Typical Sensor to Control Configuration
Black
(Evap.)
Black
(Air)
Yellow Sheath
(Evaporator Sensor
Defrost Termination)
Black Sheath
(Air Sensor-Display)
A
8
9
10
11
Black
Yellow
A
Safe-NET sensor location
Safe-NET Location
A
A
Safe-NET
Controller
Detail A
Discharge Air Temp Control
Sensor with Tie Strap
Detail B
Safe-NET sensor location
Safe-NET sensor location
Defrost Termination Sensor
located on second return
bend from the front
bend from the front
bottom row as shown
P/N 0539221_H
U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • WWW.HUSSMANN.COM
P/N 0539221_H 2-11
Sequence of Operation
Compressor runs
continuously until it
reaches its cut-out setting.
Defrost cycle is temperature
terminated. Defrost initiates
two hours after start up.
When powered up there will
be a delay of 30 sec. at start
up before the compressor starts.
OFF
Compressor
Starts
Initial Defrost
12 Hours After Start Up
Pull down
Compressor On
Maximum Defrost
Time 45 Minutes
Compressor
Starts
ON
Compressor
Start Up
Off Cycle
RLN
Time to Subsequent Defrost
(6-Hour or Demand Defrost)
Refrigeration Cycle
(Failsafe)
Defrost Cycle
Terminates at
48° F.
Time to Subsequent Defrost
(24-Hour or Demand Defrost)
Maximum Defrost
Time 45 Minutes
(Failsafe)
Pulldown After Defrost
Compressor ON
GREEN (REFRIGERATION)
YELLOW (DEFROST)
RED (ALARM)
“OFF” POSITION
WARM COLD
GREEN (REFRIGERATION)
YELLOW (DEFROST)
RED (ALARM)
DISPLAY
Safe-Net III Controller
Low Temperature Freedom Safe-NET III Settings
Safe-NET
Dial
Discharge
air Cut-In
Discharge
air Cut-Out
Avg Discharge Air
Temperature
Product Temperature
0 Off
1 0 -6 -2 -5 to 10
4 -8 -14 -6 -11 to 5
7 -17 -23 -14 -18 to 0
Medium Temperature Freedom Safe-NET III Settings
Safe-NET
Dial
Discharge
air Cut-In
Discharge
air Cut-Out
Avg Discharge
air Temperature
Product Temperature
0 Off
1 38 32 36 32 to 42
4 35 29 33 29 to 39
7 33 27 31 27 to 37
Range
Range
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. Freedom Line Reach-in
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