Structural Concepts Oasis MI44RF Installation instructions

P/N 21-34184
READ AND SAVE THESE INSTRUCTIONS
Rev E Date: 1.13.2022
INSTALLATION &
OPERATING MANUAL
Oper Manual\21-34184_QR_MIXXRF_User Manual_Mobile Island Freezer-Refrig Case.pub
M O B I L E S E R I E
SELF-SERVICE MULTI-PURPOSE FREEZER-REFRIGERATED
ISLAND DISPLAY CASES

-





MI48RF
MI44RF
888 E. Porter Road ∙ Muskegon, MI 49441
Phone: [phone] Fax: [phone] www.structuralconcepts.com
MI46RF

2
TABLE OF CONTENTS
OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING / PLUGS .............…..
CASE REMOVAL FROM SKID (LOCKING/UNLOCKING CASTERS) ……………………..………….…..
CASTER LOCKING AND EXTERIOR PANEL ATTACHMENT (AFTER REMOVAL FROM SKID) ..…..
CASE START-UP VIA MAIN POWER SWITCH / TEMPERATURE CONTROL 3-WAY SWITCH ...…..
HONEYCOMB AIR DIFFUSER ………………………………………………..……………………………….
EVAPORATOR SECTION ACCESS: RACK WIRE REMOVAL ………………………………...................
EVAPORATOR SECTION ACCESS, CONTINUED: DECK PAN REMOVAL / THERMOMETER ….….
EVAPORATOR SECTION ACCESS, CONTINUED: EVAPORATOR AREA LAYOUT ………………….
LOAD LIMIT (LOAD LINE) GUIDELINES / CASE FRONT & REAR DESIGNATIONS .………………….
PRODUCT AND SIGNAGE PLACEMENT GUIDELINES …………………………………………………..
CONDENSER PACKAGE SLIDE-OUT ………………….…………………………………………………….
CONDENSER PACKAGE EXPLODED PICTORIAL - MODEL MI44RF.7448 .…………………………...
CONDENSER PACKAGE EXPLODED PICTORIAL - MODEL MI46RF.7448 AND MI48RF.7448 ..…...
SERIAL LABEL LOCATION & INFORMATION LISTED / TECH INFO & SERVICE …………..………..
CLEANING SCHEDULE …………….………………….……………………………….…………………….
TROUBLESHOOTING (GENERAL) ..………………….………………………………….……….………….
TROUBLESHOOTING - CONDENSING SYSTEM (QUALIFIED SERVICE TECHNICIANS) ………….
TROUBLESHOOTING - EVAPORATOR SYSTEM (QUALIFIED SERVICE TECHNICIANS) ………….
PREVENTIVE MAINTENANCE (PERFORMED BY TRAINED SERVICE PROVIDER) ………………...
CAREL® CONTROLLER: Programming The Instrument …….……………………………………………..
CAREL® CONTROLLER: User Interface - Display / Summary Table of Alarm and Signals: Display,
Buzzer and Relay ..……………………………………………………………………………….…….
CAREL® CONTROLLER: Summary Table of Operating Parameters ……………………………..……...
CAREL® CONTROLLER: Changing “Raw Meat” and “Produce/Deli” Setpoints Using The Thermostat
Controller ...…………………………………………….……………………………………...………...
TECHNICAL SERVICE CONTACT INFORMATION & WARRANTY INFORMATION ...……………..…
3-4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19-20
21
22
23
24
25
26
27
28
This Operating Manual Is Applicable To The Following Models*
MI44RF, MI46RF, MI48RF, MI44RF.7448, MI46RF.7448 and MI48RF.7448
*This Operating Manual May Also Be Applicable To Models Not Listed Herein.

3
OVERVIEW
 These Structural Concepts cases are designed to
merchandise product at 3 separate temperature settings:
1. Refrigerated packaged PRODUCE/DELI products at
40 °F (4.5 °C) or less product temperatures.
2. Refrigerated packaged RAW MEAT products at 38 °F
(3.3 °C) or less product temperatures.
3. FROZEN packaged products at 0 °F (-18 °C) or less
product temperatures.
 These cases should be installed and operated according to
the following parameters to insure proper performance.
 See page 7 in operating manual for 3-way switch illustration.
TYPE I ENVIRONMENTAL CONDITIONS
This unit is designed for the display of products in ambient store
conditions where temperature and humidity are maintained
within a specific range.
 Type I display refrigerators are intended for use in an area
where environmental conditions are controlled and maintained
so that the ambient temperature does not exceed 75 °F
(24 °C) and 55% maximum humidity.
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.

WARNING
Condensate Pan is Hot!
Disconnect and allow to cool before cleaning or removing from case.
WARNING
ELECTRICAL
HAZARD
WARNING
KEEP
HANDS
CLEAR
WARNING
HOT
SURFACE
OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING / PLUGS - PAGE 1 of 2
COMPLIANCE
This equipment MUST be installed in compliance with
all applicable NEC, federal, state and local
electrical and plumbing codes.
COMPLIANCE
 Performance issues when in violation of applicable NEC,
federal, state and local electrical and plumbing codes are
not covered by warranty. See below.
WARNINGS
 This sheet contains important warnings to prevent injury or
death. Please read carefully!
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.
ATTENTION
CONTRACTORS
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.

4
OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING / PLUGS - PAGE 2 of 2
CAUTION! GFCI BREAKER USE 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.
PRECAUTIONS
 This sheet contains important precautions to prevent
damage to unit or merchandise.
 Please read carefully!
 See previous page for specifics on 
and .
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 ballast box, field wiring box, raceway
cover, or other related location.
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! CHECK CONDENSATE PAN POSITION & PLUG
Water on flooring causes damage! Before powering unit, check that:
 Condensate pan is DIRECTLY UNDER condensate drain.
 Condensate pan plug is securely plugged into receptacle.
 Overflow pan has plug connected to its box. Units with optional
Clean Sweep™ MUST HAVE 2 plugs connected.
CAUTION!
DO NOT RELY ON THERMOMETERS OR THERMOSTATS
FOR ACTUAL PRODUCT (FOOD) TEMPERATURES.
 Thermometers and thermostats reflect air temperatures ONLY.
 They do not reflect ACTUAL food temperatures.
 For ACTUAL food temperatures, use a calibrated food thermometer.
WIRING DIAGRAM FORMAT & LOCATION
 Each case has its own wiring diagram folded & in its own packet.
 Wiring diagram placement may vary; it may be placed near field
wiring box, raceway, or other related location.

55
CASE REMOVAL FROM SKID (LOCKING/UNLOCKING CASTERS)
Various Types Of
Case Shipping
Brackets

 Remove screws holding shipping brackets to skid.
 Remove shipping brackets from skid.
 See illustrations below. Note: Shipping Brackets will vary in size, shape, material and location depending
upon case type and model.
 
A. Place ramp up against skid (to allow case to smoothly slide off from skid).
B. Maintain support of case at all times or center of gravity may cause case to fall.
C. Unlock Casters. Slide unit to rear of skid. Slide down ramp and off from skid.
Note: See next page for panel attachment instructions.
Support case
while sliding
down ramp.
Ramp
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

CASTER LOCKING AND EXTERIOR PANEL ATTACHMENT (AFTER REMOVAL FROM SKID)
6

 To lock casters (from the unlocked position), press
down on each RAISED caster lever (as shown in
illustration below). Casters are now locked.
 To unlock casters (from the locked position), press
down on the RAISED caster lever (as shown in
illustration below). Casters are now unlocked.
 See sample caster design at right.

 Attach to case after case has been removed and
properly positioned/located in store.
Rear Intake
Panel
Magnet
(Typ.)
Front Air
Intake Panel
Hook (Typ.) Side
Panel (Typ.)
Casters
Unlocked
Casters
Locked
--- Sample Caster Design ---
 All exterior panels may be removed without
tools.
 Lift exterior panel up and off tabs.
 Separate lower panel from magnets
 See illustrations below.
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

CASE START-UP VIA MAIN POWER SWITCH / TEMPERATURE CONTROL 3-WAY SWITCH
7
-
 Remove front panel on control side of unit
(see illustration below).
 Turn on main power switch.
 Main power switch will start evaporator coil
fans, and the compressor motor.
-
 Remove front panel on control side of unit to
access temperature control switch.
 The 3-way switch allows unit to merchandise
product at three (3) separate temperature
settings:
A. Refrigerated packaged PRODUCE products
at 41 °F (5 °C) or less product temperatures.
B. Refrigerated packaged MEAT & DAIRY
products at 38 °F (3.3 °C) or less product
temperatures.
C. FROZEN packaged products at 0 °F
(-18 °C) or less product temperatures.
 See enlarged view of switchbox below.
Model MI44RF (Shown) May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

HONEYCOMB AIR DIFFUSER
8

 Honeycomb air diffuser is on all models.
 Honeycomb may be removed for cleaning and/or
maintenance.

 Honeycomb is located in discharge air duct.
 To remove the honeycomb from the back panel
assembly, simply squeeze (“pinch”) together and
lift out from housing.
 See 

 section in manual for cleaning
specifics.
 After cleaning, be certain to replace honeycomb
in same position so as not to disrupt airflow.
Honeycomb Air
Diffuser Shown
Removed From Case
Honeycomb Air
Diffuser Shown
Intact Within Case
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

Rack Wire
EVAPORATOR SECTION ACCESS: RACK WIRE REMOVAL
9



 Rack wire allows product to be raised from deck surface.
 To remove, simply lift rack wire up and out from case. Use caution
to avoid scraping glass or acrylic surfaces within merchandiser.
 Place in secure location away from foot traffic.
 See below illustration.
Rack Wire
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

EVAPORATOR SECTION ACCESS, CONTINUED: DECK PAN REMOVAL / THERMOMETER
10

 Thermometer is located on air return duct (as illustrated
below).
 Thermometer reflects internal air temperature only (not
actual food temperature).
 Use probe thermometers to determine actual product
temperatures.
Caution! Turn Off Power To Unit Before Removing
Deck Pans! Rotating Fans Can Cause Severe Injury!


 Deck pans consist of the pan and finger hole
inserts.
 To remove, use finger hole to grasp and lift pans
UP AND OUT of case.
 See below illustration.
Deck Pan
Finger Hole
Finger Hole
Deck Pan
Thermometer
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

EVAPORATOR SECTION ACCESS, CONTINUED: EVAPORATOR AREA LAYOUT
11
Air
Discharge
Refrigeration
Lines
Trough
Drain
Caution! Turn Off Power To Unit Before Removing Deck Pans! Rotating Fans Can Cause Severe Injury!
’

 After lower deck pans have been removed, you may access TXV, drain, refrigeration lines, trough & drain
(as illustrated below).
 Follow cleaning and/or servicing instructions for evaporator section components.
 After cleaning/servicing unit, return components in reverse order they were removed.
Wiring
Route
Evaporator Coil
Fan (Typ.) Evaporator
Coil Shroud
TXV
(Valves)
Thermometer
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

LOAD LIMIT (LOAD LINE) GUIDELINES / CASE FRONT & REAR DESIGNATIONS
12

Caution! Stacking food beyond the load line will prevent food from being at proper temperature.
 Load line is placed at location to allow proper refrigerated airflow to product.
 Load line will be etched in acrylic on both sides of case.
 NEVER set product on air return area.
 See illustration below for load line locations.

 Case front is the controls side of case.
 Case front is also the side of case that the condensing package is slid out for
cleaning and/or servicing.
 See illustration below.
Load Line
Load Line
Case Rear
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

PRODUCT AND SIGNAGE PLACEMENT GUIDELINES
13

 Higher protein products require the coolest air
temperatures on a case.
 Area of case nearest air discharge remains coolest
during regular operation.
 Place high protein products (such as poultry, sausage
and other meats) closer to air discharge side of
merchandiser.
Unacceptable
Signage
Placement
Location
(Blocking Airflow)
 Place low protein products (such as produce, sauces
and pastas closer to air return side of merchandiser).
 Note: NEVER set product on air return grille!
 See illustration top-left.

 Airflow path must not be blocked by signage or product
will not retain proper temperatures.
 DO NOT block airflow with signage!
 See illustration below-right.
Air Discharge
Air Intake
Place High Protein Products Such As Poultry,
Sausage and Other Meats Here (Closer To
Air Discharge Side of Merchandiser)
Place Low Protein Products Such As
Produce, Sauces and Pastas Here (Closer
To Air Return Side Of Merchandiser)
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

14
CONDENSER PACKAGE SLIDE-OUT
-

Pull Out Refrigeration Package
 Note: At initial slide-out, it may be necessary to remove compressor pan shipment screws (see illustration
below for location).
 Plastic glides are mounted at base to assist in sliding the condenser out for access.
 Slide condenser unit out 12 to 18 inches to access high pressure service connection.
 See the following two (2) pages in this manual for condenser package illustrations.
Compressor Pan
Shipment Screw
(one at each side)
Note: Illustration Shown May
Not Exactly Reflect Every
Feature Or Option Of Your
Particular Model.

15
CONDENSER PACKAGE EXPLODED PICTORIAL - MODEL MI44RF.7448
Sight Glass
Condensing Coil
(and Internal Fan)
Compressor
Hot Gas Loop
Condensate
Pan / Wicking
Material
Compressor
Electrical Box
Condensate
Overflow Pan
Sight Glass
Compressor
Inverter
Condensing Coil
(and Internal Fan)
Filter Dryer
Filter Dryer
Drain
Illustration Below May Not Reflect Every Feature Or Option Of Your Particular
Case. See Next Page For Alternate Condenser Package Designs.

16
CONDENSER PACKAGE EXPLODED PICTORIAL - MODEL MI46RF.7448 AND MI48RF.7448
Illustration Below May Not Reflect Every Feature Or Option Of Your Particular
Case. See Previous Page For Alternate Condenser Package Designs.
Condensing Coil
(and Internal Fans)
Hot Gas Loop
Condensate
Pan / Wicking
Material
Compressor
Electrical Box
Condensate
Overflow Pan
Sight Glass
Compressor
Drain
Filter Dryers
Compressor
Compressor
Electrical Box

17
SERIAL LABEL LOCATION & INFORMATION LISTED / TECHNICAL INFO & SERVICE

 Serial labels are located near the electrical access on your case.
 Serial labels contain electrical, temperature & refrigeration information, as well as regulatory
standards to which the case conforms.
 For additional technical information and service, see the TECHNICAL SERVICE page in this
manual for instructions on contacting Structural Concepts’ Technical Service Department.
 See images below for samples of both refrigerated and non-refrigerated serial labels.
----- Sample Serial Label For Refrigerated Case -----
----- Sample Serial Label For Non-Refrigerated Case -----

18
CLEANING SCHEDULE (“D” = Daily / “W” = Weekly)
Area/
Component DWTask
Clean
Acrylic X
Acrylic MUST BE cleaned according to these instructions to prevent acrylic
surfaces from becoming cloudy, dull or scratched.
 DO NOT use a dry cloth or paper towel to wipe off dust or debris (this can rub
dirt and dust into the acrylic surface).
 BEFORE cleaning, use air pressure or feather duster to blow or remove all
dust and debris.
 DO NOT use household cleaners (such as ammonia, bleach, Windex® or
Formula 409®).
 DO NOT use powder scouring cleansers (such as Comet® or Ajax®) or other
abrasive cleansers on acrylic!
 DO use a soft sponge or cloth with a mix of warm (not hot!) water and mild
soap solution (such as Palmolive®, Joy®, Dawn®, or Ajax® dishwashing
detergents) to wipe down surfaces.
 DO use acrylic cleaning product such as Brillianize®, or Novus® #1 (if you
want to purchase cleaners specifically formulated to clean acrylic).
 DO rinse out the soft sponge or cloth often in the solution while cleaning the
acrylic. This keeps the dust and debris from being collected in one area and
relocated to another!
 DO wipe dry with a microfiber cloth, microfiber terry cloth or chamois cloth to
dry acrylic surfaces.
 DO NOT wipe dry with a dry cloth or paper towel!
 DO use products such as Novus® #2 to remove fine scratches, haziness and
abrasions that can form in acrylic. Also, Pittman ALR® may be used to
removed oxidation (cloudy or dull acrylic surfaces).
 Note: Model MI6R.6620 adjustable acrylic dividers may be removed,
submersed in warm, soapy water, rinsed, dried and returned to case.
Clean Case
Interior XDecks and rack wires can be wiped down with warm soap and water solution and sponge or clean cloth.
XRemove the decks and rack wires and clean with soap and water.
XVacuum tub under deck. Clean with soap and water. Wipe dry with clean cloth.
XKeep drains clean and free of debris which could clog the drain and rob the case
of needed refrigeration.

19
TROUBLESHOOTING (GENERAL)
CONDITION TROUBLESHOOTING
Water Is On The Floor 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 Type 1 environments,
maximum conditions are to be 55% humidity / 75 °F. See serial label
(at case rear near main power switch) for your case type.
Check evaporator pan float for proper operation.
Check that evaporator pan is plugged in.
If so, water will overflow
pan and seep onto flooring causing damage! Until evaporator pan is
functioning (or is replaced), the following procedures are recommended:
 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.

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 drain into. 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.
Fan Emits Excessive Noise Check that the case is aligned, level and plumb.
Check evaporator fan for cleanliness.
Unplug fan motor; check motor shaft for excessive bearing wear.
Check that fan motor is securely mounted in brackets.
Verify that fan blade is 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 blade freely rotates within fan shroud.

20
TROUBLESHOOTING, GENERAL - CONTINUED
CONDITION TROUBLESHOOTING
Fans Are Not Working, Continued Check that power is going to fan
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.
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.