Structural Concepts Harmony HMG2642R.4439 Installation instructions

PN 55009
33” and 35” DEEP SERVICE REFRIGERATED DISPLAY CASES
Rev A Date: 8.17.2009
I:\Oper Manual\Standard\Harmony_Service_Refrig_Oper_Manual_55009.pub
PLEASE NOTE THE FOLLOWING:
1. YOUR SPECIFIC MODEL NUMBER IS ON THE SERIAL LABEL ON CASE REAR (NEAR MAIN POWER SWITCH).
2. SEE “MODELS (AND THEIR RESPECTIVE CASE DIMENSIONS) LISTED IN THIS MANUAL” SECTION FOR
ADDITIONAL INFORMATION REGARDING SPECIFIC CASE DIMENSIONS OF STANDARD MODELS AND CDRs.
READ AND SAVE THESE INSTRUCTIONS
Structural Concepts Corporation · 888 E. Porter Road · Muskegon, MI 49441 Phone: [phone] Fax: [phone] · www.structuralconcepts.com
INSTALLATION &
OPERATING MANUAL
(HMG7553R)
(HMG3953R) (HMG2653R)
(HMG2642R.4439)
[35” Deep Model]
HMG7553R
[33” Deep Model]
HMG3953R
[33” Deep Model] HMG2653R
[33” Deep Model]

2
TABLE OF CONTENTS
TABLE OF CONTENTS ……………………………………………………………………………………...
MODELS LISTED IN MANUAL (AND DETERMINING THEIR RESPECTIVE CASE DIMENSIONS)
OVERVIEW AND WARNINGS ……………..…….…………………………..………………………...…..
INSTALLATION: SKID REMOVAL, ADJUSTABLE FRONT TOE-KICK / REMOVABLE FRONT
GRILLE...……...…….………………………………………………………………………………………….
INSTALLATION: GLASS SHELVING / ELECTRICAL CONNECTIONS……………………………...…
INSTALLATION: REFRIG. LINES / STUB-UPS / DRAINS / WIRING DIAGRAMS / VENTILATION...
INSTALLATION: ELECTRICAL CONNECTIONS / CASTERS / ADJUSTING LEVELERS…………...
INSTALLATION: TEMPERATURE CONTROLLER …...………………………………………………….
INSTALLATION: FRONT GLASS ALIGNMENT & ADJUSTMENT……………………………………...
RAISING THE CURVED GLASS / OPENING REAR DOOR / REMOVING REAR DOORS ………...
DRAIN, HOSE AND BRACKET PLACEMENT ILLUSTRATIONS …………..…………..……….……..
MAINTENANCE FUNDAMENTALS - STANDARD LIGHT FIXTURES ...…………..……..…….…......
MAINTENANCE: REFRIGERATION PKG., TEMP. CONTROLLER, EVAPORATOR PAN ACCESS
CLEANING SCHEDULE - TO BE PERFORMED BY STORE PERSONNEL ………………………….
TROUBLESHOOTING - GENERAL ISSUES ………………………………………..…………...……….
TROUBLESHOOTING - CONDENSING SYSTEM ………………………………..……………..…..…..
TROUBLESHOOTING - EVAPORATOR SYSTEM ………………………………..……………..……...
PREVENTIVE MAINTENANCE (TO BE PERFORMED BY TRAINED SERVICE PROVIDER) ….....
SERIAL LABEL INFORMATION & LOCATION ..……………………………………...…....…………..…
TEMPERATURE CONTROLLER - CAREL® ...…. ……………………..……..…………………...……..
TECHNICAL SERVICE CONTACT INFORMATION & WARRANTY INFORMATION ...……….….....
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16-18
19
20
21
22
23-25
26

MODELS LISTED IN THIS MANUAL (AND DETERMINING THEIR RESPECTIVE CASE DIMENSIONS)
Model HMG2653R
Model HMG3953R
Model HMG5153R
Model HMG6353R
Model HMG7553R
(33” Deep Models)
DETERMINING YOUR MODEL AND ITS CASE DIMENSIONS:
Note 1. Your model number can be found on serial label at rear of case (near main power switch).
Note 2. Dimensions of most models can be found at www.structuralconcepts.com. Simply enter
the case model number into the Product Number Search box. Click the product specification
link for complete dimensions.
Note 3. If your specific model is not found, contact technical service (phone number is listed at
Technical Service section in this manual) for dimensions.
Note 4. CDRs (Customer Design Requests) are listed with a 4-digit number. All CDR dimensions
are identical to standard model dimensions.
THIS OPERATING MANUAL ENCOMPASSES THE FOLLOWING MODELS (AND THEIR
RESPECTIVE CDRs):
Model HMG2642R.4439
(35” Deep Model)

4
OVERVIEW AND WARNINGS
OVERVIEW
• These Structural Concepts Harmony® service cases are designed to merchandise packaged products
at 41°F or less product temperatures.
• These cases should be installed and operated according to this operating manual’s instructions to
insure proper performance. Improper use will void warranty.
This unit is designed for the display of products in ambient store conditions where temperatures and
humidity are maintained within a specific range.
• For NSF® Type 1 Conditions (most cases): ambient conditions are to be at 55% max. humidity / 75°F.
• For NSF® Type 2 Conditions: ambient conditions are to be at 60% maximum humidity / 80°F.
• If unsure if your case is Type 1 or Type 2, contact Structural Concepts Technical Service (see
Technical Service section in this manual for phone number).
Caution: Do not allow air conditioning, electric fans, open doors or windows to create air currents
around display case as this may detrimentally affect proper case temperatures and operation.
WARNING
Hazardous moving parts. Do not operate unit with covers removed.
Fan blades may be exposed when deck panel is removed.
Disconnect power before removing deck panel.
WARNING
Risk of electric shock.
Disconnect power before servicing unit
CAUTION
Lamps have been treated to resist breakage
and must be replaced with similarly treated lamps.
WARNING
Evaporator Pan is Hot! Disconnect and allow to cool
before cleaning or removing from case.
WARNING
More than one source of electrical supply is employed
with units that have separate circuits.
Disconnect all sources before servicing.
WARNING
ELECTRICAL
HAZARD
WARNING
ELECTRICAL
HAZARD
WARNING
KEEP HANDS
CLEAR
WARNING
HOT
SURFACE
CAUTION
ATTENTION INSTALLER
This equipment must be installed in compliance with all
applicable NEC, federal, state and local plumbing codes.

5
INSTALLATION: SKID REMOVAL, ADJUSTABLE FRONT TOE-KICK / REMOVABLE FRONT GRILLE
1. Remove Case From Skid (Levelers)
• Remove shipping brace that may be
securing case to skid.
• Support case to prevent tipping.
• Caution! Levelers can be damaged if case
hits floor with heavy force!
Case can be repositioned with pallet truck when
front lower panel is removed. Blocking may be
necessary to obtain adequate height.
Slide Skid Out
• Carefully slide unit to
rear of skid and tip
backward off skid.
• Illustration may not
reflect every feature
or option of your
particular case.
2. Remove Case From Skid (Casters)
Remove shipping brackets that may be securing
casters to skid
• Place ramp up against skid (to allow case to
smoothly slide off from skid).
• Maintain support of case at all times or center
of gravity may cause case to fall.
• Unlock Casters. Roll unit to rear of skid.
Ramp
Roll down ramp
and off from skid.
Support
while
rolling
case
down
ramp.
Note: Illustrations
shown reflect a
general outline of
sample cases and do
not reflect features or
options of your
particular model.
3. Adjustable Front Toe-Kick / Removable Front Grille
• Front toe-kick is adjustable. Simply loosen screws (one at each end) and adjust accordingly.
• To remove front grille, remove screws located at underside of front panel. This will allow access to
drain line or refrigeration lines.
• Front Grille will fall forward and can be lifted up and away from case.
• Replace Front Grille in reverse order it was removed from case.
• Note: Illustration below may not reflect every feature or option of your particular case.
(3) Front Grille
Retainer Screws
Adjustable
Toe-Kick Slot
(at Each End)

6
INSTALLATION: GLASS SHELVING / ELECTRICAL CONNECTIONS
4. Glass Shelving
Glass shelving will be packed separately.
• Caution! Carefully remove from packaging.
• Grasp firmly and carefully install.
• Caution! Check that plastic edging is intact
before placing glass shelving onto brackets!
• Plastic edging must NOT be removed from
glass shelves. Contact Structural Concepts for
replacement edging (see TECHNICAL
SERVICE CONTACT INFORMATION section).
• Check that glass shelving is in proper position
before placing product in case.
• See illustration at mid-right.
5. Electrical Connections
Remote Units
• Remove front or rear panel (by removing
screws and lifting off case)
-------- Remote Unit --------
Knockouts
Glass
Shelves
• Knockouts are located on side and rear of
electrical box.
• Single phase leads are provided.
• See serial label (at case rear) for voltage rating.
• See illustration at lower-right.
Self-Contained Units
Field wiring connection / junction box location is at
rear-right of case.
• See illustration at below-left.
• Single phase leads are provided.
• Plug unit into wall outlet.
• See serial label (at case rear) for voltage rating.
Note:Wiring process must be performed by
certified electricians only.
-------- Self-Contained Unit --------

7
INSTALLATION: REFRIG. LINES / STUB-UPS / DRAINS / WIRING DIAGRAMS / VENTILATION
6. Refrigeration Line Stub-Up Connections
(Remote Units)
• Remove front panel.
• Refrigerant stub-up access opening is at the
front on the left hand side of the base (see
illustration at top-right).
• Stub-up connections are accessed from inside
the case.
• Remove interior ABS decks.
• Remove fan shroud assembly.
• Line connections are in the tub front, on the left
hand side
• Remove foam material from the entry hole
provided in the tub drain trough.
• Route refrigerant lines through access hole.
• Run case-to-case connections through
cutouts in base.
• Sweat the high and low pressure
connections.
• Fill access hole with suitable filler to insure
watertight integrity of tub.
• Illustration at top-right may not reflect every
feature or option of your particular case.
7. Refrigeration Drain Connection
(Remote Units)
• Depending upon drain access needs, either front
or rear panel may be removed to gain access to
drain stub-up.
• 1.5” male PVC stub-up connection is under the
case on the right hand side.
• Drain stub-up may be at case center in extended
length cases.
• Connect tub drain to floor drain. Maintain
1/4”-fall per foot to provide proper drainage.
• Illustration at top-right may not reflect every
feature or option of your particular case.
8. Evaporator Pan / Drain Position
(Self-Contained Units)
• Remove rear panel (by removing screws).
• Slide the Condenser Unit out from case.
• Condenser Unit access is now available.
• Insure that the evaporator pan is installed under
the PVC condensate drain trap.
• Insure that the evaporator pan is plugged into the
receptacle inside base.
• Lower rear panel back into place.
Refrigeration
Line
Stub-Ups
Access
Drain Stub-Up
(may be at case
center in extended
length cases)
10. Ventilation and Clearance
• Self-Contained refrigerated cases must
maintain airflow clearance of 6” (minimum) to
12” (recommended) at front and rear.
• Restriction of air can void warranty.
• Illustration below may not reflect every feature
or option of your particular case.
Check air grilles for obstructions.
Maintain airflow clearance of 6” (min.)
to 12” (recommended) at front & rear.
9. Electrical Wiring Diagram
• Each case has its own wiring diagram
folded and in its own packet.
• Wiring diagram placement may vary; it may
be placed near condenser fan cover,
ballast box, raceway cover, or other related
location.
• See Drain, Hose and Bracket Placement
section in Operating Manual for details.

8
INSTALLATION: ELECTRICAL CONNECTIONS / CASTERS / ADJUSTING LEVELERS
11. Display Case Start-Up
• Remote Units: Case is hard-wired. When power is
supplied, case will power-up.
• Self-Contained: Main Power switch on all units are
located at case rear, lower right.
• Self-Contained: Temperature Controller is located
at case rear, lower right.
• Turn on the lights. Whether Remote or Self-
Contained, light switch is located on inside of case
at top right, from case rear.
• All lights should come on at same time. First time
lighting may require short warm up period for
bulbs. Slightly dim/flickering of new bulbs is normal.
• The lighting is wired in series so all lights must be
plugged in or receptacles capped to turn on.
12. Cases With Casters: Lock and Unlock
• To lock casters, press down on lever.
• To unlock casters, pull lever up.
• See illustration at lower right.
13. Cases With Levelers: Adjust Levelers
• After case is in position, adjust case so it is level
and plumb (see illustration at right).
• You may need to remove front and/or rear Toe-
Kick to access levelers.
• Use adjustable wrench (and possibly a pry bar) to
adjust leveler.
• Do not use pry bar on toe-kick (it may buckle).
• Do not use pry bar on end panel (it may chip).
• Use pry bar ONLY on base frame to avoid
damaging case.
• Use a block to reach base frames with pry bar.
• See illustrations below.
Pry Bar
Base
Frame
Leveler
Adjustable
Wrench
Toe-Kick
Block
Locked
Unlocked
Cap
Plug
Receptacle
Temperature
Controller
Main
Power
Switch
View of Case Rear, Self-Contained Unit
Rear Grille

9
INSTALLATION: TEMPERATURE CONTROLLER
Sample Carel®
Controller Face
14. Temperature Controller (All Self-
Contained Units and some Remote Units)
• Check that compressor symbol light is on.
• SCC-Supplied temperature controller compressor
is identified with:
Compressor symbol (common in Carel®
temperature controllers).
• After case has run for a few minutes, check that
temperature starts to drop.
• If temperature controller does not begin cooling
(in a few minutes) see temperature controller
section in this operating manual for instructions.
• Remote units (without temperature controller on
case): Verify that refrigeration requirements listed
on serial label (found on the case) are being met.
15. Saturated Suction Temperature (Remote
Units)
• See serial label on case for suction temperature
requirements and BTU requirements.
• See serial label on case for defrost schedule and
temperature termination parameters.

INSTALLATION: FRONT GLASS ALIGNMENT & ADJUSTMENT
10
—- Front Glass —-
Case with Curved
Front Glass
16. Front Glass Alignment & Adjustment via Levelers
• Proper alignment of the front glass is important to create and maintain a seal inside the case.
• Improper alignment can cause air leaks compromising the environment inside the case and create condensation.
• Follow the five steps listed below to assure proper front glass alignment.
2. Front-to-Back Leveling:
• Place a level on top of case,
perpendicular to front glass.
• Raise or lower either side of case by
rotating levelers to center the level
bubble (follow steps 3 and 4).
• Double-check the side-to-side level.
1. Side-to-Side Leveling: Place level on top of display case (parallel
to the front glass). Raise or lower either side of the case by rotating
levelers to center the level bubble (following steps 3 and 4 below).
5. Verification:
• After adjusting
the levelers,
open and shut
the front glass.
• Verify again that
front glass is
properly aligned
at both left-hand
and right-hand
side of case.
• If not, repeat the
above procedure
until front glass is
properly aligned
along both sides
of case.
18. Front Glass Alignment & Adjustment
via Clamshell Allen Screw Adjustment
• Make certain case is level and plumb.
• Lift glass to maximum upright position.
• Determine which side requires realignment.
• While maintaining grip on glass, loosen the Allen
screws nearest to misaligned side.
• Adjust the glass until properly positioned.
• Allen screws may now be tightened (taunt, but
not overly tightened lest glass breakage occur).
• If other side needs alignment, repeat steps while
maintaining grip on glass.
• Illustrations at right may not exactly reflect every
feature or option of your particular case.
FRONT
GLASS PANEL
LIFT
END PANEL
4. If FRONT-RIGHT CORNER
is too close to end panel (or
hitting it), adjust levelers at
the BACK RIGHT CORNER
of case DOWNWARD.
LIFT
PANEL FRON
T
GLASS
3. If FRONT-LEFT
CORNER is too close to
end panel (or hitting it),
adjust levelers at the
BACK LEFT CORNER of
case DOWNWARD.
END PANEL
Allen
Screw
Lift Handle Clamshell
Upper
Clamshell
Lower

11
RAISING THE CURVED GLASS / OPENING REAR DOOR / REMOVING REAR DOORS
Raise the Curved Glass
• To raise the curved glass, secure lift handle
extrusion on the bottom edge of the door and
lift up.
• Caution: Gently return curved glass to original
position.
• See illustration below.
Opening Rear Door / Removing Rear Doors
• 26” Models have swinging clear glass door
View of Rear
Doors being
lifted up,
pivoted out
and away
from case.
View of Curved
Glass being
raised
Main Power
Switch (Self-
Contained
Only)
that opens with either left hand (standard) or
right hand hinge (optional).
• All other models have removable rear doors (see
illustration below).
• Move rear doors toward the center of case.
• Individually lift each door up toward the top of
case and pivot bottom of the door out.
• Caution: Gently set doors down to avoid
marring, scraping, scratching or breakage.

12
DRAIN, HOSE AND BRACKET PLACEMENT ILLUSTRATIONS NOTE: BELOW ILLUSTRATIONS MAY
NOT EXACTLY REFLECT EVERY
PARTICULAR CASE’S FEATURES
2. Hot Gas Evaporator System.
• Hot gas serpentine coil is routed through a condensate
reservoir allowing water to be heated. This system
uses a wicking material (partially submersed) with
warm condenser air passing through it for evaporation.
• Also incorporates an overflow reservoir with heating
element to ensure complete condensate removal.
Three Evaporator Systems Are Illustrated Below:
Illustration #1: Hot Gas “CopeVap” Evaporator
System. “Copevap” is built into Compressor Unit.
Illustration #2: Hot Gas Evaporator System.
Illustration 3A/3B : Electrical Heat Rod Evaporator
System. Note: Separate Evaporator Pan.
Warning! Regardless of Evaporator, the Hose and
Drain Trap MUST BE secured and positioned over
Evaporator Pan to prevent water seepage / spillage.
When sliding out Condenser Unit, be careful that
drain is not pulled from proper position.
1. Hot Gas “CopeVap” Evaporator System.
Clear PVC
Tube
Drain Trap
Hose thru bracket
Bracket
Note: Drain
positioned
directly over
Reservoir
“CopeVap”
Reservoir Clamp
3B. Isometric View of
Electrical Heat Rod Evaporator System
Evaporator Pan
Evap. Pan Positioning Bracket
Use Hose Clamp
to Secure Hose
to Adapter
Clear PVC
Tube
Evap. Pan
Positioning
Bracket
Drain
Trap
Refrigeration
Assembly
Base
Compressor Pan
Shipment Screw
(1 at each side)
Wicking
Material
This area of your unit
may widely vary (due to
display case options).
Suction
Accumulator
Hot
Serpentine
Coil
Receiver
Elec. Box, Hot
Gas Condensate
Overflow
Scroll
Compressor
Fan
Shroud
Filter
Drier
Sight Glass
3A. Front View of
Electrical Heat Rod Evaporator System
Evaporator
Pan
Drain
Trap

13
Note: See Installation section in this manual for:
• Front panel removal
• Front toe-kick adjustment
Light Fixtures
Warning! Disconnect power before providing
maintenance and service to unit.
Caution: Lamps have been treated to resist
breakage and must be replaced with similarly
treated lamps.
Note: Warranty will be void if claims arise from
negligence, misuse of goods, extreme
environmental conditions or improper
maintenance. See Overview And Warnings
section in this operating manual.
Light fixtures are located on underside of shelf
assemblies and at the top inside of case.
See illustration at top-right for locations.
Removal of lamp:
• Rotate lamp (1/4-turn) either direction to
disengage (upper or lower) pins/contacts from
lamp-mounting sockets.
• Remove bulb by applying even pressure from
back side at the bulb ends and pulling the
remaining contact from sockets.
• See illustrations at mid and lower-right.
Installation of lamp:
• Align pins with slot.
• Insert pins into socket by rotating the bulb 1/4-
turn to secure either the (upper or lower) pin
contacts into the sockets.
• Rotate remaining bulb contacts (1/4-turn) into
remaining lamp mounting socket contacts.
• See illustrations at right.
Drain and Expansion Valve Access
• The drain and expansion valve are both accessi-
ble from the front of the case.
• Unplug the fans (one plug per side) and remove
the fastener from the access panel in the front
right (or left) corner of the unit.
• The drain and the expansion valve (TXV) are
directly below the access panel.
MAINTENANCE: STANDARD LIGHT FIXTURES
Lamp Pins
Light Socket Light Fixture
Light
Fixtures
Bracket
Retainers
Fan Plug TXV Access
Panel Evaporator
Fan

14
MAINTENANCE: REFRIGERATION PKG., TEMP. CONTROLLER, EVAPORATOR PAN ACCESS
The Illustration below may not depict an exact
representation of your particular unit.
Rear Grille
Compressor Pan
Shipment Screw
(one at each side)
• The toll-free number is listed in the Technical
Service section of this manual.
• See Temperature Controller section in this
manual.
NOTE: Spirit-filled thermometers located in the
refrigerated compartment are for monitoring warm-
est air temperature in accordance with NSF Std. 7
Evaporator Pan Access / Removal
• Turn off main power; allow evaporator pan to
cool.
• Lift Rear Grille up and off (no tools required).
• WARNING! Evaporator Pan May Be Hot!
Check temperature of pan prior to handling.
• Withdraw evaporator pan from the right side
behind electrical box.
• Unplug evaporator pan from the electric outlet.
• Empty evaporator pan contents into suitable
container. Replace rear panel when completed.
Refrigeration Package Access
Note: Servicing to be accomplished by licensed
electrical / refrigeration contractor.
Air Filter
• Magnetic strips attached to the filter adhere the
filter to the rear grille.
• Clean the nylon mesh filter by rinsing thoroughly
with water against the air flow direction.
• Mild detergent removes smoke & grease stains.
• See illustration at top-right.
Pull Out Refrigeration Package
• Remove the rear grille. Grille may be slid upward
and out or removal of two screws may be required.
• Note: At initial slide-out, it may be necessary to
remove Compressor Pan Shipment Screws (see
illustration at right for location).
• Refrigerant lines are flexible to facilitate rear access
maintenance.
• Plastic glides are mounted at base to assist in sliding
the condenser out for access.
• Service connections are at the left of compressor.
• Slide condenser unit out 12 to 18 inches to access
high pressure service connection.
Temperature Controller (Self-Contained Units Only)
• Temperature Controller is located in the Ballast Box.
• Temperature / Defrost control settings are
programmable from these locations.
• Case Temperature Set Point is set at the factory, as
determined by case size & sensor probe location.
• Temperature is controlled by thermostat.
• If a temperature setting change is required, follow
instructions regarding Temperature Control
Programming Steps in the technical information
section of this operating manual.
• If service is required to the temperature control unit,
call Structural Concepts Corporation. Maintenance
should be performed by a certified technician.

15
CLEANING SCHEDULE - TO BE PERFORMED BY STORE PERSONNEL
AREA FREQ. INSTRUCTIONS
Exterior Daily All Glass / Mirrors: Clean side glass, front glass, glass shelves, and mirrors with
household or commercial glass cleaner. Clean out door track with moist cloth.
Daily Rear Sliding Door Exterior Glass:Clean with household or commercial glass
cleaner.
Daily End Panels, Front Panel, Toe-Kick, etc.: Wipe off all surfaces with warm water
and mild soap solution and non-abrasive cloth.
Weekly Wood, Laminate and Painted Surfaces:Clean with mild soap and water
solution and a soft cloth .
Weekly Acrylic:Clean with warm water, mild soap solution and soft cloth; acrylic
cleaning solutions are also available. Caution! Never use ammonia-based
cleaners on acrylic. Incorrect cleaning agents or abrasive cleaning cloths cause
surface to ‘cloud’ over time.
Weekly Air Filter (with Magnetic Strips) on Rear Grille: Remove air filter. Rinse with
hot water against air flow direction. Use mild detergent to remove smoke and
grease stains.
Monthly Condensing Coil:Remove rear grille. Vacuum or brush grille area on back of
case; clean dust and dirt collecting on condenser coil. Avoid damaging fins.
Monthly
Under Case Cleaning:Remove front toe-kick (or rear grille). Vacuum under
case to remove all dust and dirt. Replace front toe-kick (or rear grille) when
complete.
Interior Weekly Decks:Wipe off decks with moist cloth dipped in mild soap and water solution.
Monthly Tub and Drain: Keep clean and free of debris which could clog tub and drain.
To access drain area, remove the deck and fan shroud.
• Vacuum tub under deck.
• Direct the drain to a floor drain or a bucket.
• Run hose into drain to flush out debris. Carefully hose out the tub.
• Caution! Avoid splattering water over the case and surrounding areas!
Monthly Air Return Grille and Fan Shroud Area:1) Turn off power. 2) Remove decks
from case. 3) Clean with moist cloth.

16
TROUBLESHOOTING - GENERAL ISSUES (PAGE 1 of 3)
CONDITION TROUBLESHOOTING
Case Not Lining Up See Installation Section for instructions on properly aligning case
(alongside other cases) and adjusting levelers.
Water Is On The Floor Caution! Water on flooring can cause much damage! Until cause is
determined (and repaired), following these procedures:
• Use wet-dry vacuum (or mop & bucket) to remove standing water.
• Use ‘catch pans’ for water to drain into. Swap out regularly until
case has completely drained.
Note: See Drain, Hose and Bracket Placement Illustrations sheet in this
manual for views of different evaporator systems used in display cases.
Check that the drain trap is free of debris.
Check that the drain hose is correctly positioned over evaporator pan (or
floor drain, for remote units).
Check store conditions. To prevent condensation in NSF® Type 1
environments, maximum conditions are to be 55% humidity / 75°
Fahrenheit. For NSF® Type 2, maximum conditions are to be 60%
humidity / 80° Fahrenheit. See serial label (at case rear near main
power switch) for NSF® Type of your case.
Check evaporator pan float for proper operation (Heat Rod Evaporator
System only).
Check that evaporator pan is plugged in.
Caution! Evaporator pan may be malfunctioning (Electrical Heat Rod
Evaporator system). If so, water will overflow pan and seep onto
flooring causing damage! Until evaporator pan is functioning (or is
replaced), following these procedures:
• Use wet-dry vacuum (or mop & bucket) to remove standing water.
• Use ‘catch pans’ for water to drain into. Swap out regularly until
case has completely drained.
Caution! Disruption of power can cause water to overflow pan and
seep onto flooring causing damage! Check that power to case is
constant. Until power is restored, following these procedures:
• Use wet-dry vacuum (or mop & bucket) to remove standing water.
• Use ‘catch pans’ for water to drainage. Swap out regularly until
evaporation of case is complete (or until power is restored).
When power to case is restored, evaporator pan should function
properly and water will no longer overflow onto flooring.
Wicking material may be dirty or worn and need replacement (Hot Gas
Evaporator system).
• Slide refrigeration system out from under unit.
• After refrigeration system has been carefully slid out from under unit,
replace wicking material with new. If wicking material is not avail-
able, contact Structural Concepts®. See toll-free number at last
page of this operating manual.

17
TROUBLESHOOTING - GENERAL ISSUES (PAGE 2 of 3)
CONDITION TROUBLESHOOTING
Fan Emits Excessive Noise Check that the case is aligned, level and plumb.
Check evaporator fan for cleanliness.
Unplug fan motors; check motor shaft for excessive bearing
wear.
Check that fan motors are securely mounted in brackets.
Verify that fan blades are securely mounted to fan motor.
Check that nothing is preventing blade rotation.
Check that the fan shroud is properly secured.
Fans Are Not Working Check that the MAIN power switch (if present) is on.
Check that fans are plugged in to fan shroud.
Check for foreign material obstructing fan performance.
Check that fan blades freely rotate within fan shrouds.
Check that power is going to fans.
Check that fan wiring is connected on terminal blocks.
System Is Not Operating Check that the utility power is on.
Check the circuit breaker box for tripped circuits.
Case Is Not Holding Temperature If a large amount of warm product was added to the case, it will
take time for the temperature to adjust. Product should be
pre-chilled before placing in display case.
Check Temperature Controller section in this manual.
Check that the case is not in the sun or near a heat or air
conditioning vent.
If case is located near outside doors, temperature fluctuation
can hinder unit’s ability to maintain temperature.
Check air grilles for obstructions. Maintain airflow clearance of
6” (minimum) to 12” (recommended) at case front and rear.
Check sight glass for flashing and/or low charge.
Check Set Point Temperature; it may be adjusted too high.

18
TROUBLESHOOTING - GENERAL ISSUES (PAGE 3 of 3)
CONDITION TROUBLESHOOTING
Control Display Is Flashing Check Temperature Controller section in this manual.
Condensing Unit Is Not Operating
(Self-Contained Units Only) Check Temperature Controller section in this manual.
Check that the power is turned on.
Review Temperature Controller’s Settings for accuracy.
Check that ALL lights are plugged in and receptacles capped.
See MAINTENANCE FUNDAMENTALS - LED LIGHT FIX-
TURES section in this manual for illustrations.
Case Lights Are Not Working Check that Light switch is in the ON position (self-contained
cases only). Remote case lights come on at start-up.
Check for burned out bulbs. Turn lights off & replace.
Clean dirt and dust from the bulbs to prevent flickering.
Check to insure voltage at ballasts. If voltage is entering but
not exiting the ballast, ballast is faulty.

19
TROUBLESHOOTING - CONDENSING SYSTEM (QUALIFIED SERVICE TECHNICIANS ONLY)
CONDITION TROUBLESHOOTING
Head Pressure Too High Check that the Condensing Coil is not dirty or covered.
Check that Condensing Fans are working.
Check that the refrigeration system is not overcharged.
Check that case is free of non-condensables.
Check that the Liquid Line Drier Filter is not plugged.
Check Set Point temperature; it may be adjusted too high.
Check System Operating temperatures.
Check that Store Ambient temperature isn’t above maximum
allowed. See Overview and Warnings Section.
Head Pressure Too Low Check that Refrigerant Charge isn’t too low.
Check that Suction Pressure isn’t too low.
Check to verify that Compressor Valves aren’t faulty.

20
TROUBLESHOOTING - EVAPORATOR SYSTEM (QUALIFIED SERVICE TECHNICIANS ONLY)
CONDITION TROUBLESHOOTING
Low Suction Pressure Check for low refrigerant.
Check that Expansion Valve isn’t restricted.
Check that Liquid Line or Filter isn’t restricted.
Check that Evaporator Motors are working.
Check for Superheat setting.
Check that the Thermostatic Element charge isn’t depleted.
Check that the Coil is not iced up.
High Suction Pressure Check that Refrigerant Charge isn’t too high.
Check that Compressor Valves aren’t faulty.
Check that there is no air seepage around Condensing Coil.
Check that the Cooling Load isn’t high.
Check that Superheat adjustment isn’t low.
Check TXV Bulb Installation
a. Poor thermal contact.
b. Warm location.
Check Compressor: Low capacity means it is undersized for its
application.