Hussmann microSC MNGSC8-A User manual

MNGSC8-A
Medium Temperature Self Contained
Island Merchandisers
Installation &
Operation Manual
P/N 3113125_A
January 2019
Spanish 3113126
MANUAL- I/O SELF-CONTAINED MNGSC8A
®
®
WARNINGS:
If the information in these instructions are not followed
exactly, a fire or explosion may result, causing property
damage, personal injury or death.
Installation and service must be performed by a qualified
installer or service agency.
READ THE ENTIRE MANUAL BEFORE
INSTALLING OR USING THIS EQUIPMENT.
The unit uses R-290 gas as the refrigerant. R-290 is
flammable and heavier than air. It collects first in low
areas but can be circulated by the fans. If propane gas is
present or even suspected, do not allow untrained
personnel to attempt to find the cause. The propane gas
used in the unit has no odor. Thelack of smell does not
indicate a lack of escaped gas. If a leak is detected,
immediately evacuate all persons from the store, and
contact the local fire department to advise them that a
propane leak has occurred. Do not let any persons back
into the store until the qualified service technician has
arrived and that technician advises that it is safe to
return to the store. No open flames, cigarettes or other
possible sources of ignition should be used inside or in
the vicinity of the units.
FAILURETO ABIDEBY THIS WARNING COULD
RESULT IN AN EXPLOSION, DEATH, INJURYAND
PROPERTY DAMAGE.
IMPORTANT
Keep in store for future reference!

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P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
BEFORE YOU BEGIN
Read these instructions completely and carefully.
PERSONAL PROTECTION EQUIPMENT (PPE)
Personal Protection Equipment (PPE) is required whenever installing or servicing this
equipment. Always wear safety glasses, gloves, protective boots or shoes, long pants, and
a long-sleeve shirt as required when installing or servicing this equipment.
1. If the information in these instructions are not followed exactly, a fire or explosion may result, causing property damage, person-
al injury or death.
2. Installation and service must be performed by a qualified installer or service agency.
3. This unit is designed only for use with R-290 (propane) gas as the designated refrigerant.
THE REFRIGERANT LOOP IS SEALED. ONLY A QUALIFIED TECHNICIAN SHOULD ATTEMPT TO SERVICE!
• Propane is flammable and heavier than air.
• It collects first in the low areas but can be circulated by the fans.
• If R-290 (propane) is present or even suspected, do not allow untrained personnel to attempt to find the cause.
• The propane gas used in the unit has no odor.
• The lack of smell does not indicate a lack of escaped gas.
• If a leak is detected, immediately evacuate all persons from the store, and contact the local fire department to advise them that a
pro pane leak has occurred.
• Do not let any persons back into the store until the qualified service technician has arrived and that technician advises that it is
safe to return to the store.
• A hand-held propane leak detector (“sniffer”) shall be used before any repair and/or maintenance.
• No open flames, cigarettes or other possible sources of ignition should be used inside the building where the units are located
until the qualified service technician and/or local fire department determines that all propane has been cleared from the area and
from the refrigeration systems.
• Component parts are designed for propane and non-incendive and non-sparking. Component parts shall only be replaced with
identical repair parts.
FAILURE TOABIDE BY THIS WARNING COULD RESULT IN AN EXPLOSION, DEATH, INJURY AND PROPERTY DAMAGE.

P/N 3113125_A iii
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained Merchandisers
ANSI Z535.5 DEFINITIONS .......... vi
INSTALLATION
UL Listing ......................... 1-1
Federal / State Regulation ............ 1-1
Hussmann Product Control ........... 1-1
Shipping Damage ................... 1-1
Location ........................... 1-1
Self Contained Location .............. 1-2
Model Description .................. 1-3
Unloading ......................... 1-3
Exterior Loading .................... 1-3
Shipping Skid ...................... 1-3
Merchandiser Leveling ............... 1-3
Serial Plate Location ................. 1-4
Refrigeration Unit Access ............. 1-4
Sealing Merchandiser to Floor ......... 1-4
Self-Contained 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 Models) .. 2-1
Refrigeration System Layout........... 2-2
Waste Outlet and Water Seal .......... 2-2
Before Beginning any Service or Repair . . 2-3
Replacing Refrigeration Components ... 2-4
Steps to Recover Refrigerant .......... 2-4
Charging .......................... 2-5
Waste Outlet and Water Seal .......... 2-6
Installing Drip Piping ................ 2-7
Drip Piping Lineup Arrangements ...... 2-8
START UP / OPERATION
Controller Operation ................. 3-1
Connections ........................ 3-2
LED .............................. 3-3
KDEPLUS Buttons .................. 3-4
Setpoint: Setting and Edit Lock ........ 3-5
Display Probes Value ................. 3-5
Key-Activated Functions .............. 3-5
Typical Sensor Location .............. 3-6
Controls and Adjustments ............ 3-7
Load Limits ........................ 3-8
Stocking ........................... 3-8
Thermometer ....................... 3-8
MAINTENANCE
Care and Cleaning ................... 4-1
Removing Scratches from Bumper ...... 4-2
Cleaning Under Fan Plenum .......... 4-2
Cleaning Discharge Air Honeycomb .... 4-2
Cleaning Stainless Steel Surfaces ....... 4-3
Cleaning Condenser Air Filter ......... 4-3
Cleaning Coils ...................... 4-3
Cleaning Evaporation Pan ............ 4-4
Self-Contained Refrigeration Equipment
Maintenance Check List ............. 4-5
SERVICE
Replacing Fan Motors and Blades ...... 5-1
Troubleshooting Guide ............... 5-2
WARRANTY
TABLE OF CONTENTS
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.

iv
P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
REVISION HISTORY
ORIGINAL ISSUE — JANUARY 2020
* * * * * * * * * * * * * * * * * * * * * * * * * *
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.
Merchandiser must operate for 24 hours
before loading product!
Regularly check merchandiser temperatures.
Do not break the cold chain. Keep products
in freezer before loading into merchandiser.
These merchandisers are designed
for only pre-frozen products.
AT TENTION
Merchandiser must operate for 24 hours
before loading product!
Regularly check merchandiser temperatures.
Do not break the cold chain. Keep products in
cooler before loading into merchandiser.
These merchandisers are designed
for only pre-chilled products.
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
© 2020 Hussmann Corporation

P/N 3113125_A 1-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained 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.
ANSI/NSF-7 Type I – Display Refrigerator / Freezer
Intended for 75°F (24°C) / 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. Do not under any
circumstances connect a damaged cabinet to
the electric circuit. Otherwise, there is the risk
of electric shock or refrigerant leakage!
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 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
SELF CONTAINED (LOCATION)
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.
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 refrigeration
system.
MODEL DESCRIPTION
The MNGSC8-A models are island, spot
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.
MNGSC8-A models are designed for medium
temperature operation. These models have upper
glass on all four sides of the merchandiser.
AIR
INTAKE
AIR
EXHAUST
4 IN
CLEARANCE
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 clarified by the California State
government, Proposition 65 can be considered more of
a‘right to know’ law than a pure product safetylaw.
When used as designed, Hussmann believes that our
products are notharmful. 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.
August 31, 2018
Case ventilation openings must be
clear of any obstructions. Do not
damage the refrigerant circuit.
Do not use mechanical devices or other
means to accelerate the defrosting
process, other than those recomended
by the manufacturer.
Do not use electrical appliances inside
the food storage compartments of the
case(s), unless they are of the type
recommended by the manufacturer.

P/N 3113125_A 1-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained Merchandisers
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.Remove all separately
packed accessories. Improper handling may
cause damage to the merchandiser when
unloading.
To avoid damage:
1. Do not drag the merchandiser out of the
trailer. Use a Johnson bar (mule). Use a
forklift or dolly to remove the merchandiser
from the trailer.
2. Use caution when moving case to
setup location. Use care to not damage
refrigeration system. Confirm there are
no refrigerant leaks during startup of the
case(s).
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 (if provided). 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.
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.
Do NOT stand or walk on top of
merchandiser. Do not store items or
ammable materials atop the unit.
Remove #7 x 2” Philips screws
from merchandiser base
Do NOT remove shipping skid until
the merchandiser is positioned for
installation.

1-4 InstallatIon
P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
SERIAL PLATE LOCATION
The serial plate is located on the inside of the
merchandiser’s display area.
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. For self contained
cases, two screws will have to be removed from
either end of the panel. Make sure all electrical
wiring is secured, and that there is no damage
to the unit from shipment or placement.
Confirm there are no refrigerant leaks during
startup of the case(s). The panel is installed
by reversing the above procedure. Ensure
merchandiser base is properly installed on case
to prevent air circulation problems.
SEALING MERCHANDISER TO FLOOR
If required by local sanitary codes, or if the
customer desires, merchandisers may be sealed
to the floor. Make sure lower front and rear
panels are still able to be removed to service the
condensing unit when sealing around the case.
NOTE: Do not allow trim to cover any intake
or discharge grilles located in the lower front
panel.
SERIAL
PLATE

P/N 3113125_A 1-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained 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***
Step Startup Activity Check
1 Locate, read and keep 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. Do not use
adapters.
6 Ensure that the proper electrical requirements for the equipment are
supplied.
7
8
Verify all electrical wiring is secured andclear ofanysharp edges or
hot lines. Connect plug to the outlet.
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.
Some water should be placed in the drain to close the siphon and
prevent formation of ice.

1-6 InstallatIon
P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
NOTES:

P/N 3113125_A 2-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained Merchandisers
MERCHANDISER ELECTRICAL DATA
Refer to the technical data sheets and
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.
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. If
the power cord is damaged, it must be replaced
by personnel qualified for this task to prevent
hazardous situations.
CONDENSATE PAN HEATER
(Optional)
A condensate pan heater is available as an
option. As a standard offering, there is no
heater installed in the condensate pan.
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 merchandiser
refrigeration piping is leak tested.
ELECTRICAL / REFRIGERATION
ALWAYS CHECK THE SERIAL PLATE FOR
COMPONENT AMPERES
NEMA 5-15P
Plug
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 MaIntenance
P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
REFRIGERATION SYSTEM LAYOUT
Product must be pre-chilled to 41°F (5 °C) or
less prior to being placed in merchandiser.
This system consists of two refrigeration
circuits. Each circuit has one condensing
unit. The discharge line runs through the
evaporation pan to increase the water
temperature located in the top level of the
evaporation pan. At the same time, refrigerant
temperature drops, increasing system capacity.
Figure A. Machine Compartment Layout
Figure B. Refrigeration Circuit #1 (left side)

P/N 3113125_A 2-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained Merchandisers
Before Beginning Any Service or Repair:
Use a hand-held propane leak detector (“sniffer”)
to ensure no propane is present in the immediate
area, the inside of the display case and the inside
of the refrigeration system. R-290 is an odorless
refrigerant. Keep the area clear of all customers
and non-essential or unauthorized personnel.
Verify that all repair parts are identical models
to the ones they are replacing. Do not substitute
parts such as motors, switches, relays, heaters,
compressors, power supplies or solenoids.
Failure to do so can result in an explosion,
death, injury and property damage. Parts
used on hydrocarbon cases must meet specic
UL certication for non-incendive or non-
sparking components. Use only Hussmann
approved parts approved through the Hussmann
Performance Parts Website. https://parts.
hussmann.com/
Brazing must not begin before all propane has
been cleared from the immediate area — the
inside of the displays case and the inside of the
refrigeration system.
Only Hussmann or factory
trained technicians should
service or repair this R-290
(propane) equipment.
Failure to follow
instructions can result in
an explosion, death, injury
and property damage.
Refrigeration lines are under pressure.
Refrigerant must be recovered before
attempting any connection or repair.
Figure C. Refrigeration Circuit #2 (right side)

2-4 electrIcal / refrIgeratIon
P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
If a leak is detected, follow store safety
procedures. It is the store’s responsibility to have
a written safety procedure in place. The safety
procedure must comply with all applicable codes
such as local re department’s codes.
At minimum, the following actions are required:
• Immediately evacuate all persons from the
store, and contact the local re department to
advise them that a propane leak has occurred.
• Call Hussmann and/or a qualied service
agent and inform them that a propane sensor has
detected the presence of propane.
• Do not let any persons back into the store
until the qualied service technician has arrived
and that technician advises that it is safe to
return to the store.
• The propane gas used in the unit has no odor.
The lack of smell does not indicate a lack of
escaped gas.
• A hand-held propane leak detector
(“sniffer”) should be used before any repair and/
or maintenance is attempted. All repair parts
must be identical models to the ones they are
replacing.
• No open flames, cigarettes or other possible
sources of ignition should be used inside the
building where the units are located until the
qualied service technician and/or local re
department determines that all propane has been
cleared from the area and from the refrigeration
systems.
Only Hussmann service technicians or
technicians qualied to handle R-290
(propane) refrigerant should service or
repair this R-290 (propane) equipment
Failure to follow instructions can result
in an explosion, death, injury and
property damage.
refrigeration
line tapping
valve
REPLACING REFRIGERATION SYSTEM
COMPONENTS
STEPS TO RECOVER REFRIGERANT
1. Make sure you are in a well ventilated area before
making any service or repair to the refrigeration
system.
2. Disconnect all power sources from the system.
Some systems may have more than one plug or
power supply.
3. Tap system with line tap valves, attaching gauges to
the high and low sides of the system.
4. Connect hose to an evacuated recovery tank.
Open refrigeration gauges and recovery tank.
5. With the suction valve in vacuum, the refrigerant will
be recovered into the recovery tank.
6. Once recovered, close the tank valve and remove
the guage from the tank and connect nitrogen tank
to the system to purge it with nitrogen.

P/N 3113125_A 2-5
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained Merchandisers
7. Pull vacuum to a minimum of 200 microns or
lower.
CHARGING
A calibrated scale with +/-2 gram accuracy
must be used to charge the system. The charge
amount is shown on the serial plate. Only R-290
grade refrigerant can be used. Standard propane
does not meet the purity/moisture content of
R-290, and therefore cannot be used to charge
cases.
No gas charge adjustments are allowed. When
connecting hoses between the refrigeration
system, manifold gauges, and refrigerant
cylinder, ensure that the connections are secure
and there are no potential sources of ignition
nearby. Ensure that contamination of different
refrigerants does not occur when using charging
equipment.
Use dedicated hoses to service R-290 (propane)
refrigeration systems. Hoses or lines should be
as short as possible to minimize the amount of
refrigerant contained in them.
Ensure that the refrigeration system is properly
grounded prior to charging the system with
refrigerant, to avoid the potential for static
build-up.
Extreme care must be taken not to overll the
refrigeration system. After charging, carefully
disconnect the hoses, attempting to minimize
the quantity of refrigerant released. Further
leak check the service ports, hoses, refrigerant
tanks. The service ports shall be checked for
leaks using a hydrocarbon leak detector with a
sensitivity of 3 grams/year (0.106 Oz/year) leak
rate.
Thoroughly leak check the service ports. If no
leak is present, use a pinch-off tool to close the
ends of the service tubes before brazing them
shut. Remove all service ports. If a Schrader
valve is used on the compressor service tube,
it must be removed and the previous steps
followed in order to braze the service tube shut.
— 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.
Component parts shall be replaced with like
components, and servicing shall be done by
factory authorized service personnel only, so
as to minimize the risk of possible ignition
due to incorrect parts or improper service.

2-6 electrIcal / refrIgeratIon
P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
WASTE OUTLET AND WATER SEAL
These merchandisers have two waste outlets.
The condensate water outlet is located at each
end of the merchandiser. The outlet has a
factory installed, external water seal. For self-
contained models, this water seal may drain
into the condensate evaporator pan located
beneath the merchandiser, or directly to a floor
drain. The water seal is installed to prevent air
leakage and insect entrance.
For cases with evaporation pans:
Make sure the water level is similar in both
pans. During defrost cycle or off-time when the
compressor reaches setpoint, the water from the
evaporator goes to each evaporation pan.
NOTE: All lower base panels must be in place
when the refrigerator is operating. If not,
airflow from the condenser will be directed over
the evaporator pan and defrost water in the
pan may overflow.

P/N 3113125_A 2-7
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained Merchandisers
INSTALLING DRIP PIPING
(units with a floor drain)
Poorly or improperly installed drip pipes can
seriously interfere with the merchandiser’s
operation and result in costly maintenance and
product losses.
Optional drip pipe arrangements are shown on
the next page. Assemble the components using
PVC specific threaded pipe sealer according to
the manufacturer’s direction.
Please follow the recommendations listed
below when installing drip pipes to ensure
proper installation.
1. Never use drip piping smaller than the
nominal diameter of the pipe or water seal
supplied with the merchandiser.
2. When connecting drip piping, the water
seal must be used as part of the drip piping
to prevent air leakage or insect entrance.
Never use two water seals in series in any
one drip pipe. Double water seals in
series will cause an air lock anD
prevent Draining.
3. Pitch the drip piping in the direction of
flow. There should be a minimum pitch of
1/4in. perft (20mm per 1m).
4. Avoid long runs of drip piping. Long runs
make it impossible to provide the pitch
necessary for good drainage.
5. Ensure that drip piping is supported to
relieve any stress on drip pipe connectors
and drain hub.
a. Drip piping MUST be supported 24 inches
from drain hub tee.
6. Provide a suitable air break between
flood rim of the floor drain and outlet of
drip pipe. To meet code requirements, it may
be necessary to install a field-supplied
drip pipe reducer. An alternative is to
cut the last section of drip pipe at an
angle.
7. Prevent drip pipes from freezing:
a. Do NOT install drip pipes in contact
with uninsulated suction lines. Suction lines
should be installed with a nonabsorbent
insulation material.
b. Where drip pipes are located in dead air
spaces, such as between merchandisers or
between a merchandiser and a store wall,
provide means to prevent freezing.
It is the installing contractor’s
responsibility to consult local agencies
for local code requirements.
Product will be degraded and may spoil if
allowed to sit in a non-refrigerated area.

2-8 electrIcal / refrIgeratIon
P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • www.hussmann.com
DRIP PIPING LINEUP ARRANGEMENTS
The following illustrations below show typical
arrangements for installing drip pipes for a
lineup of merchandisers. Illustrations are for
reference only. Piping may vary with location
and access to hub drain(s). Each merchandiser
waste outlet must be individually piped to a
hub drain if 1/4in. drip piping pitch cannot be
maintained.
NOTE: No more than two merchandisers are
to be piped per water seal. Do not install water
seal between two merchandiser waste outlets
that are piped together. Double water seals in
series will cause an air lock and prevent drain-
age.

P/N 3113125_A 3-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A. MNGSC8-A Self Contained Merchandisers
START UP / OPERATION
CONTROLLER OPERATION
The electronic controller is located in the
cassette compartment. The controller comes
factory set, and is ready for use. The front grille
must be removed in order to access this control.
When removing the grille for this operation or
for condenser cleaning, care must be taken not
to damage the display interface cable. It may be
unplugged during this task.
1. Plug the merchandiser plug into its receptacle.
a. The controller display will illuminate.
b. The interior light will illuminate.
2. After the control preprogrammed time
delay of up to 6 minutes, the compressor and
evaporator fan(s) will start if the control is
calling for cooling.
3. The control will cycle the compressor but
may also cycle evaporator fan(s) on and off
determined by the setpoint and differential
temperatures.
a. The setpoint 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 reflect the
refrigeration cycle of the setpoint and it’s
differential. The most accurate temperature on
a cabinets operation is to verify the product
temperature.
Main Features:
• Panel-mounted
• Energy saving algorithms and optimised
defrost control
• 8 preloaded applications
• Defrost at single / double evaporator
• Frame Heater
• Local network auto-conguration
• Direct load connection (up to 2 HP)
• Supply voltage control LVD
• Presence of an open collector output

3-2 startup / operatIon
P/N 3113125_A U.S. & Canada 1-800-922-1919 • Mexico 1-800-890-2900 • 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.