Structural Concepts Harmony HMG2642R.4439 User manual

HARMONY™ 33” and 35” DEEP REFRIGERATED SERVICE DISPLAY MERCHANDISERS
REV D DATE: 11/02/2022
USER MANUALS\55009_HARMONY_USER MANUAL_HMG(L)(R)R_33-35 DEEP_REF_SVC_CASE
(HMG2642R.4439)
[35” Deep Model]
HMG7553R
[33” Deep Model]
HMG3953R
[33” Deep Model]
HMG2653R
[33” Deep Model]
HMG5153R
[33” Deep Model]
SCC P/N
55009
USER
MANUAL
HARMONY
CAREFULLY FOLLOW THESE INSTRUCTIONS
Structural Concepts Corp. ∙ 888 E. Porter Rd ∙ Muskegon, MI 49441 Phone: [phone] Fax: [phone] ∙ www.structuralconcepts.com

2
TABLE OF CONTENTS
TABLE OF CONTENTS ………………………………………………………………………………………....
OVERVIEW AND WARNINGS …………………………………………………………………………………
INSTALLATION: SKID REMOVAL, ADJUSTABLE FRONT TOE-KICK / REMOVABLE FRONT
GRILLE...……...…………………………………………………………………………………….…….
INSTALLATION, CONT’D: GLASS SHELVING / ELECTRICAL CONNECTIONS………………………..
INSTALLATION, CONT’D: REFRIGERATION LINES / STUB-UPS / DRAINS / WIRING DIAGRAMS /
VENTILATION …………………………………………………………………………………….……..
INSTALLATION, CONT’D: ELECTRICAL CONNECTIONS / CASTERS / ADJUSTING LEVELERS .....
INSTALLATION, CONT’D: PROGRAMMABLE CONTROLLER …….……………………………….…….
INSTALLATION, CONT’D: FRONT GLASS ALIGNMENT & ADJUSTMENT ..……………………………
RAISING THE CURVED GLASS / OPENING REAR DOOR / REMOVING REAR DOORS …….……...
DRAIN, HOSE AND BRACKET PLACEMENT ILLUSTRATIONS …………..…………..…………..……..
CLEANING SCHEDULE - TO BE PERFORMED BY STORE PERSONNEL …………………….……….
MAINTENANCE FUNDAMENTALS - STANDARD LIGHT FIXTURES ...…………..……..…….….…......
MAINTENANCE: REFRIGERATION PKG., TEMP. CONTROLLER, EVAPORATOR PAN ACCESS ...
TROUBLESHOOTING - GENERAL ISSUES ………………………………………..…………...…….…….
TROUBLESHOOTING - CONDENSING SYSTEM ………………………………..……………..……...…..
TROUBLESHOOTING - EVAPORATOR SYSTEM ………………………………..……………..…….…...
PREVENTIVE MAINTENANCE (TO BE PERFORMED BY TRAINED SERVICE PROVIDER) ……......
SERIAL LABEL INFORMATION & LOCATION ..……………………………………...…....……………..…
PROGRAMMABLE CONTROLLER INFORMATION ...…. ……………………..……..…………………….
TECHNICAL SERVICE CONTACT INFORMATION / WARRANTY INFORMATION ...…………...….....
2
3-4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19-21
22
23
24

3
OVERVIEW
• These Structural Concepts cases are designed to
merchandise packaged products at 41 °F (5 °C) or less
product temperatures (unless custom cases with wire
rack shelving).
• Product must be pre-chilled to 41 °F (5 °C) or less before
being placed in merchandiser.
• Cases should be installed and operated according to this
operating manual’s instructions to ensure proper
performance. Improper use will void warranty.
TYPE 1 vs. TYPE 2 CONDITIONS
This unit is designed for the display of products in ambient
store conditions where temperatures and humidity are
maintained within a specific range.
• Type 1 conditions: ambient conditions are to be 55%
max. humidity and 75 °F (24 °C) max. temperature.
• Type 2 conditions: ambient conditions are to be 60%
max. humidity and 80 °F (27 °C) max. temperature.
• If unsure if unit is Type 1 or 2, see tag next to serial label.
See SERIAL LABEL LOCATION & INFORMATION
LISTED / TECH INFO & SERVICE section in this manual
for sample serial labels).
COMPLIANCE
• Performance issues when in violation of applicable
NEC, federal, state and local electrical and plumbing
codes are not covered by warranty.
• See below compliance guideline.
WARNINGS
• This page contains important warnings to prevent injury or
death. Please read carefully!
PRECAUTIONS and WIRING DIAGRAMS
• See next page for PRECAUTIONS and WIRING
DIAGRAM information.
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! More than one source of electrical supply is
employed with units that have separate circuits.
Disconnect ALL ELECTRICAL SOURCES before servicing.
WARNING
ELECTRICAL
HAZARD
WARNING
KEEP
HANDS
CLEAR
COMPLIANCE
This equipment MUST be installed in compliance with
all applicable NEC, federal, state and local
electrical and plumbing codes.
OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / CORDS / WIRING - PAGE 1 of 2
WARNING
This product can expose you to chemicals, including
Urethane (Ethyl Carbamate), which are known to the state of
California to cause cancer and birth defects or other reproductive
harm. For more information go to P65Warnings.ca.gov.
WARNING
Condensate pan and overflow condensate pans are HOT!
Disconnect and allow to cool before cleaning or removing from case.
WARNING
HOT
SURFACE

PRECAUTIONS
• Following are important precautions to prevent damage
to unit or merchandise. Read carefully!
• See previous page for specifics on OVERVIEW,
CONDITION TYPE, COMPLIANCE and WARNINGS.
WIRING DIAGRAM
• Each case has its own wiring diagram folded and in its
own packet. It may be placed near ballast box, field
wiring box, raceway cover, or other related location.
REFRIGERANT DISCLOSURE STATEMENT
• This equipment is prohibited from use in California with
any refrigerants on the “List of Prohibited Substances” for
that specific end-use, in accordance with California Code
of Regulations, title 17, section 95374.
• This disclosure statement has been reviewed and
approved by Structural Concepts and Structural Concepts
attests, under penalty of perjury, that these statements
are true and accurate.
OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / CORDS / WIRING - PAGE 2 of 2
4
CAUTION! POWER CORD AND PLUG MAINTENANCE
Risk of electric shock. If cord or plug becomes damaged,
replace only with cord and plug of same type.
CAUTION! GFCI BREAKER REQUIREMENT
If N.E.C. (National Electric Code) or your local code
requires GFCI (Ground Fault Circuit Interrupter) protection,
you MUST use a GFCI breaker in lieu of a GFCI receptacle.
CAUTION! ADVERSE CONDITIONS / SPACING ISSUES
• Performance issues caused by adverse conditions are NOT warranted.
• To prevent damage to end panels due to condensation, apply industrial grade
silicone sealant and tightly join to opposite end panels. When not adjoining
cases, keep end panels at least 6” away from walls/structures. Rear panels
must also be kept at least 6” from walls and structures.
• Case must not be exposed to direct sunlight or any heat source.
• To maintain proper case temperature, keep case at least 15-feet from exterior
doors, overhead HVAC vents or any air curtain disruption.
• Self-contained case clearance: 6” min. air intake / 6” min. air discharge.
CAUTION
CAUTION! DO NOT RELY ON THERMOMETERS OR
THERMOSTATS FOR PRODUCT (FOOD) TEMPERATURES.
• Thermometers & thermostats reflect air temperatures ONLY.
• For ACTUAL product (food) temperatures, use a calibrated food
probe thermometers ONLY.
• For accurate readings, DO NOT use infrared food thermometers.
CAUTION! CHECK CONDENSATE PAN, ITS POSITION & PLUG!
Water on flooring can cause extensive damage!
• Before powering up case, check that condensate pan is positioned
directly under case’s condensate drain.
• Before powering up case, check that condensate pan’s electrical plug is
SECURELY connected to condensate system’s receptacle.
• If wicking material is used in condensate pan, check that it is secure.

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, CONT’D: 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, CONT’D: 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.
• See Drain, Hose and Bracket Placement
section in Operating Manual for details.
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.

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
Cap
Plug
Receptacle
Temperature
Controller
Main
Power
Switch
View of Case Rear, Self-Contained Unit
Rear Grille

9
INSTALLATION: PROGRAMMABLE CONTROLLER
14. Programmable Controller (All Self- Contained Units and some Remote Units)
• Check that compressor symbol light is on.
• SCC-Supplied temperature controller compressor is identified with:
• 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.
• See Programmable Controller section in User Manual for additional information.
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.

10
INSTALLATION: FRONT GLASS ALIGNMENT & ADJUSTMENT
—- 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.
17. 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.
CURVED
FRONT
GLASS
END
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
END
PANEL
CURVED
FRONT
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
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.

14
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.
1. Fluorescent Style Light Fixtures
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 top-right.
2. LED Style Light Fixtures
Removal of faulty LED light:
• LED lights rarely require change-out.
• To remove faulty LED light, simply grasp light
near retaining spring and carefully pull away
from its spring. Disconnect plug from socket.
• Contact Structural Concepts’ Technical Service
Department for replacement parts (see
Technical Service section of this manual for
information).
Replacement of LED light:
• To replace LED light fixture, simply insert new
LED light at proper position (socket must be near
plug). Carefully snap into metal springs so LEDs
are held firmly in place.
• Note: LED light and plug must be connected in
a specific manner or they will not work.
A. Certain plug designs (“barrel type”) merely
require that plug be pushed all the way in.
B. Other plugs require “oval edge” of plug to
connect to oval edge of LED light.
• See illustrations below.
MAINTENANCE: FLUORESCENT STYLE LIGHT FIXTURES / LED STYLE LIGHT FIXTURES
Lamp Pins
Light Socket Light Fixture
Plug
A
LED’s Barrel
Shaped
Insert
LED
Light
“Barrel-Shaped” LED Plug & Light Fixture
LED’s Oval Form Plug’s
Oval Form
--- LED Plug & Light Fixture ---
Retaining
Springs
B
“B-Shaped” LED Plug & Light Fixture

15
MAINTENANCE, CONT’D: REFRIGERATION PKG., TEMP. CONTROLLER, EVAP. PAN ACCESS
• Unplug evaporator pan from the electric outlet.
• Empty evaporator pan contents into suitable
container. Replace rear panel when completed.
Drain and Expansion Valve Access
• The drain and expansion valve are both accessible
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.
• See illustration immediately below.
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)
• 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.
• 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 warmest 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.
Rear Grille
Compressor Pan
Shipment Screw
(one at each side)
Fan Plug TXV Access
Panel
Evaporator
Fan

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 available, 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 programmable 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
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.
Electricians Only: Check to insure voltage at ballasts. If voltage is
entering but not exiting the ballast, ballast is faulty.
LED Lights: Check that ALL lights are plugged in and receptacles capped
as shown in illustration below.
See MAINTENANCE FUNDAMENTALS - LED LIGHT FIXTURES
section in this manual for illustrations.
Control Display Is
Flashing
Check Temperature Controller section in this manual.
Condensing Unit Is Not Op-
erating (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.
Gap No Gap

19
TROUBLESHOOTING - CONDENSING SYSTEM (BY TRAINED SERVICE PROVIDERS 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 refrigerant is not overcharged.
Perform sub-cooling check and verify that no contaminates are in system.
Check that liquid line filter dryer is not plugged.
Check that close-offs are intact (around condensing coil) and that air is not
recirculating.
Check that store ambient temperature isn’t above maximum allowed.
See OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS /
WIRING / PLUGS section in this manual.
Head Pressure Too Low Check if sight glass is flashing or showing low charge.
Check that suction pressure isn’t too low.
Check that compressor reed valves aren’t bad. Look for high suction/low
head pressure. Perform pump-down.

CONDITION TROUBLESHOOTING
Low Suction Pressure Check if sight glass is flashing or showing low charge.
Check that expansion valve (TXV) isn’t restricted. Check element charge.
Check that liquid line or filter isn’t restricted. Check that refrigeration lines
and/or hoses are not kinked on either high or low sides.
Check that evaporator fan motors are working.
Check that superheat is between 6 °F to 8 °F.
Check that there is no air recirculation around evaporator coil.
Check that evaporator coil is not iced up.
High Suction Pressure Check for refrigerant overcharge.
Check that compressor reed valves aren’t bad. Look for high suction/low
head pressure. Perform pump-down.
Check that the “cooling load” isn’t high. Product must be pre-chilled before
placing in refrigerated section of case.
Check that case is at least 15-feet from exterior doors, overhead HVAC
vents or any air curtain disruption.
Check that unit is not exposed to direct sunlight via windows or any other
heat source (ovens, fryers, etc.).
Check that superheat adjustment isn’t low.
Check TXV bulb installation
a. Poor thermal contact.
b. Warm location.
20
TROUBLESHOOTING - EVAPORATOR SYSTEM (BY TRAINED SERVICE PROVIDERS ONLY)