Structural Concepts Oasis BD3632 User manual

REV B DATE: 05/04/2023
USER MANUALS\21-29855_OASIS_USER MANUAL_BD3632_BD4732_BD(L)32_REFRIG_SELF-SVC_BOX DOOR CASE
OASIS® REFRIGERATED MODEL BD3632 AND BD4832 BOX DOOR CASE
> SELF-CONTAINED REFRIGERATION SYSTEM (STANDARD)
> REMOTE REFRIGERATION SYSTEM (OPTIONAL)
> FRONT DOOR NON-LOCKING (STANDARD)
> CASE ADJOINMENT POSSIBLE
Oasis
READ AND SAVE THESE INSTRUCTIONS
® USER
MANUAL
--- Model BD4832 (Shown Above) With Two Doors ---
--- Model BD3632 (Shown Above) With One Door ---
Structural Concepts Corp. ∙ 888 E. Porter Rd ∙ Muskegon, MI 49441 Phone: [phone] Fax: [phone] ∙ www.structuralconcepts.com
SCC P/N
21-29855

2
TABLE OF CONTENTS / MODELS TO WHICH THIS MANUAL IS APPLICABLE
OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING / PLUGS …………...
INSTALLATION: CASE REMOVAL FROM SKID / POSITIONING / LEVELER ADJUSTMENT ...…...
GENERAL MERCHANDISER ILLUSTRATION - MODEL BD3632 …...……………………………….
FRONT/REAR PANEL REMOVAL / CONNECTIONS CHECK / TURNING ON POWER TO CASE …..
LED LIGHT FIXTURES .…………………………………………………………………………………..…....
CLEANING SCHEDULE (TO BE PERFORMED BY STORE PERSONNEL) …..……………...…….….
PREVENTIVE MAINTENANCE - TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ....…..
TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDER ONLY) …………
TROUBLESHOOTING - R-290 CONDENSING SYSTEM (BY TRAINED SERVICE PROVIDERS) .....
TROUBLESHOOTING - R-290 EVAPORATOR SYSTEM (BY TRAINED SERVICE PROVIDERS) ....
SERIAL LABEL LOCATION & INFORMATION LISTED / TECH INFO & SERVICE ……….…….……
PROGRAMMABLE CONTROLLER INFORMATION………………………………………..………….…..
TECHNICAL SERVICE CONTACT INFORMATION / WARRANTY INFORMATION …...……………..
3-4
5
6-9
10
11
12
13-15
16-18
19
20
21
22
23

3
OVERVIEW
• These Structural Concepts merchandisers are designed
to merchandise packaged products at 41 °F (5 °C) or
less product temperatures.
• Product must be pre-chilled to 41 °F (5 °C) or less
product temperatures prior to placing 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 II ENVIRONMENTAL CONDITIONS
• This unit is designed for the display of products in
ambient indoor store conditions where temperature and
humidity are maintained within a specific range.
• This Type II display refrigerator is intended for use in an
area where environmental conditions are controlled and
maintained so that the ambient temperature does not
exceed 80 °F (27 °C) and 55% maximum humidity.
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.
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
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
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 / WIRING / PLUGS - PAGE 1 of 2
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
PRECAUTIONS
• This sheet contains important precautions to prevent
damage to unit or merchandise. Please read carefully!
• See previous page for specifics on OVERVIEW,
TYPE, COMPLIANCE and WARNINGS.
OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING / PLUGS - PAGE 2 of 2
WIRING DIAGRAM
• Each case has its own wiring diagram folded and in its
own packet.
• Location: Diagram may be near ballast box, field wiring
box, raceway cover, or other related location.
CAUTION! GFCI BREAKER USE REQUIREMENT
If N.E.C. (National Electric Code) or local code requires GFCI (Ground
Fault Circuit Interrupter), use a GFCI breaker in lieu of a GFCI receptacle.
CAUTION! LAMP REPLACEMENT GUIDELINES
LED lamps reflect specific size, shape and design.
Any replacements must meet factory specifications, resist breakage
and reflect similar appearance as lamps from factory.
CAUTION
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 & CONNECTIONS!
Water on flooring can cause extensive damage!
• Before powering up case, check that condensate pan is positioned directly
under case’s condensate drain.
• Also, check that there are NO LOOSE CONNECTIONS, including overflow
condensate pan and its power cord plug (if part of the condensate package).
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.
WIRING DIAGRAM FORMAT & LOCATION
• 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.
• Adjoined cases must be connected to each other so that vending
controls system properly communicates with additional case.

5
Support case
while rolling
down ramp.
Lev
ele
--- Rotated View of Model BD3632 ---
INSTALLATION: CASE REMOVAL FROM SKID / POSITIONING / LEVELER ADJUSTMENT
Shipping
Bracket
Front
Panel
Adjustable
Wrench
Indexing Flat
Pry Bar
1. Disconnect Case From Skid
• Remove front and rear panels.
• Also, remove shipping brackets that
secure casters to skid
• Important! Case is shipped with levelers
in the DOWN position (for stability). To
prevent damage to the case, all levelers
must be raised ALL THE WAY UP before
moving unit off skid and into position.
• After levelers are raised, place ramp up
against skid (to allow case to smoothly
roll off from skid).
2. Roll Case Off Skid via Ramp
• Maintain support of case at all times or
center of gravity may cause case to fall.
• Roll unit to rear of skid.
• Check that ramp is secure and possibly even
attached to skid with screws.
• Carefully roll down ramp and off skid.
3. Position & Align Alongside Other
Cases
• Before adjusting levelers, make certain that the
case is in proper position and, if required,
aligned with adjoining case(s).
• This may require repositioning of the case you
are installing or the already positioned cases.
4. Adjusting Levelers
• Important! After case is in proper position,
levelers must then be LOWERED to floor.
• Adjust levelers so the case is level and plumb.
Depending upon case weight it may be
necessary to use an indexing flat pry
bar (or similar pry bar) to do so.
• Use adjustable wrench to adjust leveler.
• Do not use indexing flat pry bar on
end panel as it may chip.
• Use indexing flat pry bar ONLY on base frame to
avoid damaging case.
• See illustrations at right.
• After case if level and plumb, you may replace
front and rear panels.

Model BD3632 Is Shown. It May
Not Reflect Every Feature or
Option of Your Particular Case.
6
GENERAL MERCHANDISER ILLUSTRATION - MODEL BD3632 - PAGE 1 of 4
1. Front View of Case
• View is shown with front panel removed (for
electrical box & condenser package viewing).
• Vending controls system (monitor, payment
processor, locks, etc.) is at right side of case.
• Shelves/dividers have weight sensors for product
weighing and pricing.
Condenser
Package
Programmable
Controller
Main Power
Switch
Door Handle
Front Panel
Shown Removed
Shelf (Typ.)
Rear Plenum
Leveler (Typ.)
Thermometer

7
GENERAL MERCHANDISER ILLUSTRATION - MODEL BD3632 - PAGE 2 of 4
2. Rear View of Case
• Rear panel is shown removed to show access to condenser
package and electrical box.
• Vending Control System is at rear-left of case.
Power Cord
Rear Panel
Shown Removed
Power Cord Slot
Rear Panel
Condenser
Package
Leveler (Typ.)
Model BD3632 Is Shown. It May
Not Reflect Every Feature or
Option of Your Particular Case.

8
GENERAL MERCHANDISER ILLUSTRATION - MODEL BD3632 - PAGE 3 of 4
3. Self-Contained Hot Gas Loop Condensate Package (Shown Rotated 180°)
• Caution: Only trained service providers are to provide maintenance and service to unit.
• Warning! Disconnect power before providing maintenance and service to unit.
• Important: Carefully read all Warning/Caution/Danger labels on unit!
Compressor
Filter Dryer
Compressor
Inverter
Condenser
Fan & Housing
Courtesy Loop
Condenser Coil
Housing
CleanSweep® Automatic
Condenser Coil Cleaner (Optional)
Hot Gas Loop
Condensate
Pan
Refrigeration
Lines
Model BD3632 Is Shown. It May
Not Reflect Every Feature or
Option of Your Particular Case.

9
GENERAL MERCHANDISER ILLUSTRATION - MODEL BD3632 - PAGE 4 of 4
5. Evaporator Coil Fans / Air Discharge
When case is energized, refrigeration will be provided.
• Evaporator coil fan should turn on.
• From inside of the case, check for discharge air
from honeycomb discharge duct to confirm that
the fan is functioning properly.
Drain
Wire
Route
Trough
Refrigeration
Line Route
Refrigeration
Lines
TXV
Evaporator
Fan Shroud
• When the case is in a start-up mode or has been
idle for a long period of time, the unit will require
75-minutes of run time to pull-down temperature.
6. TXV (Thermostatic Expansion Valve)
• TXV (at customer front-left side of case).
• Decking must be removed for access.
• See illustration below for TXV location.
Close-Off
Coil
Cover
Tub
Close-Off
Evaporator
Coil
Evaporator Fan
& Blades

10
FRONT/REAR PANEL REMOVAL / CONNECTIONS CHECK / TURNING ON POWER TO CASE
1. Removable Front/Rear Panel
• Front and rear panel can be removed/replaced
by simply grasping top ‘lip’ and pulling
outward, freeing it from magnets.
• See illustration below.
2. Check Condenser Package Connections
Before Powering Up Case!
• Caution! Connections can come loose
during shipment; this can allow water to
overflow onto floor, causing damage!
• When case in is proper location, remove front
and rear panels to check for loose
connections, including overflow condensate
pan and its power cord plug (if part of the
condensate package).
• See TROUBLESHOOTING section in operating
manual for various troubleshooting issues.
3. Turning On Power To Case
• Plug in power cord.
• Turn on main power switch (at lower left).
• Return front and rear panels to case.
• Check that programmable controller is energized.
• Open door: check that LED light in upper plenum
is energized and that evaporator fans are rotating.
Magnet
Front Panel
Main Power
Switch
Magnet
Magnets
Programmable
Controller
Rear Panel
Model BD3632 Is Shown. It May
Not Reflect Every Feature or
Option of Your Particular Case.

LED Style Light Fixtures
Removal of Faulty LED Lights:
• Contact Structural Concepts’ Technical Service
Department for replacement LED lights.
• Turn off LED light switch.
• To remove faulty LED light, follow these steps:
A. Disconnect plug from LED light.
B. Using both hands, grasp LED light assembly
(with its magnetic mounting clips). Pull
downward and off its shelf (or header).
C. Remove magnetic mounting clips from LED
light by pressing against flange part of clip with
thumb.
>> Note: Mounting clips MAY be riveted to header.
Simply remove LED light from mounting clips by
pressing against flange part of clips with thumb.
11
LED LIGHT FIXTURES
Replacement of LED lights:
• Attach magnetic mounting clips onto LED light.
• Adjust magnetic mounting clips so they are equally
spaced on LED light.
• Reattach LED light assembly to its shelf/header.
• Position properly in shelf/header.
>> Note: If mounting clips are riveted to shelf (or header),
attach by placing LED in base of clip and then snapping
into clip at FLANGE SIDE.
• Press plug’s barrel-shaped insert deep into LED light.
• Important: If plug is not inserted ALL THE WAY IN the
LED light’s orifice, the light may not energize. See
“BAD” vs. “GOOD” insertion illustrations below.
• Turn LED light switch back on.
Lower
Case Area
Magnetic Mounting
Clip View #2
LED
Lights
B
A
Plug
Barrel
Shaped
Insert
LED
Light
C
Magnetic Mounting
Clip View #1
No Gap
Gap
LED Light Switch LED Lights (Typ.)
Upper
Case Area

12
CLEANING SCHEDULE - PERFORMED BY STORE PERSONNEL
FREQ. INSTRUCTIONS
Daily Inner Metal Components: Shelves, Decks, Rear Perforated Plenum, Inner End Panels, Etc.):
• Wipe with cloth dipped in mild-soapy water. Dry with soft cloth.
Outer Metal Components: Door Frame, Door Handles, Lower Panels, End Panels, Etc.):
• Wipe with cloth dipped in mild-soapy water. Dry with soft cloth.
Daily Glass Surface (Door):
• Clean inside and out with household or commercial glass cleaner. Dry with soft cloth or paper towel.

13
WARNING! TURN OFF CASE BEFORE PERFORMING PREVENTIVE MAINTENANCE!
QUARTERLY PREVENTIVE MAINTENANCE INSTRUCTIONS
Tub, Coil, Drain, Fan Blades, Motors, Brackets:
Caution! Do Not Clean or Perform Service On Unit While It Is Energized!
1. Remove front panel (to access controls). No screw removal is required. Place in safe place away from
foot traffic.
2. Turn off main power switch (located near programmable controller).
3. Remove deck pans. Place in safe place away from foot traffic.
4. Disconnect power cord that energized fan panel.
5. Grasp fan shroud assembly. Lift up and away from case. Place in safe place away from foot traffic.
Cleaning Process:
• Use vacuum to remove excessive residue AND to remove dust in coil.
• Use clean cloth and/or nylon brush with warm water and mild soap solution to clean tub, drain, trough,
TXV, lines, solenoid, coil & coil tubes. See enlarged view of components to be cleaned (lower-right).
• Remove debris that may clog drain.
• Wipe down fan blades, motors and brackets with moist cloth. Dry components with paper towel.
Returning Components / Restoring Power To Case:
• Replace/reconnect components in reverse order they were removed or disconnected.
• Turn main power switch back on. Check that fans are operational.
PREVENTIVE MAINTENANCE - TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY - 1 of 3
3
2
1
Enlarged
View Of
Components
To Be
Cleaned
4
5

14
WARNING! TURN OFF CASE BEFORE PERFORMING PREVENTIVE MAINTENANCE!
QUARTERLY PREVENTIVE MAINTENANCE INSTRUCTIONS, CONT’D
Under Case Cleaning:
Caution! You must turn main power switch off before cleaning!
• Remove front and rear panel (no screw removal required).
• Remove shipment screws from condenser package (if still intact).
• Carefully slide condenser package out from under case. Caution! Be careful not to kink or damage
courtesy loop!
• At case rear, vacuum (or broom) under case to remove all dust, debris and dirt that may collect.
Condensate Package:
Caution! You must turn main power switch off before cleaning!
• Remove front panel. Turn main power switch off and allow components to cool.
• Carefully and slowly slide condensate package out from under case.
• Use a soft-bristled scrub-brush and non-corrosive de-scaling solution (to remove calcium, lime and
rust) from condensate pan. Wipe down courtesy loop. Follow de-scaling solution’s instructions as to
proper dilution and safety precautions.
• After thoroughly cleaning pan with brush and solution, rinse thoroughly with clean water
(in spray bottle) and wipe dry with sponge or paper towel.
• Use moist cloth to wipe off dust & debris that collects on various parts (hot gas loop condensate pan,
compressor fan, blades and housing, fans, sight glass (if any), refrigeration lines, courtesy loop,
overflow pan (if any), etc.
• Slide condensate package back under case.
• Return front panel to case.
• See GENERAL MERCHANDISER ILLUSTRATION - MODEL BD3632 - PAGE 3 of 4 in this
operating manual for condensate package illustration.
PREVENTIVE MAINTENANCE - TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY - 2 of 3

15
ANNUAL PREVENTIVE MAINTENANCE INSTRUCTIONS
Optional Clean Sweep® Condensing Coil Cleaner:
Important! Disconnect power from case before cleaning Clean Sweep® Condenser Coil Cleaner!
• Remove front panel (no screw removal is requiredd).
• Carefully slide out condensing package.
• Remove the four (4) screws holding Clean Sweep® rails intact.
• Remove the Clean Sweep® rail.
• Wash rail and brushes in hot water and mild soap solution.
• If brushes are worn, they must be replaced. Call Technical Service Department to replace.
Contact information is listed in final page of this User Manual.
• Caution! Coil fins are sharp. Handle with care!
• Reattach Clean Sweep® rail to condensing unit (4 screws).
• Slide/roll condensing unit assembly back under case.
• Replace front panel to case in same manner it was removed.
• See photos below.
(4) Screws
--- Above photos are taken after front panel has been removed from case ---
BrushesRail
PREVENTIVE MAINTENANCE - TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY - 3 of 3

16
CONDITION TROUBLESHOOTING
Case Not
Lining Up
See INSTALLATION section in this manual 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), follow 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.
Check that the drain trap is free from debris.
Check that the drain hose/pipe is correctly positioned over condensate pan (or floor drain,
for remote units).
Check store conditions. To prevent condensation in Type II environments, maximum
conditions are to be 55% maximum humidity / 80° Fahrenheit maximum temperature.
Check that condensate pan components have no loose connections.
Check that overflow condensate pan (if any) has its power cord plug properly plugged into
electrical box.
Check that overflow condensate pan (if any) is not malfunctioning. Its electric rod heater
should be heating up when case is energized.
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, follow
these procedures:
• Use wet-dry vacuum (or mop & bucket) to remove standing water.
• Use ‘catch pans’ for water to drainage. Swap out regularly until drainage of case is
complete (or until power is restored).
• When power to case is restored, condensate pan should function properly and water
will no longer overflow onto flooring.
TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDER ONLY) - PAGE 1 of 3

17
CONDITION TROUBLESHOOTING
Fan Emits Excessive
Noise
Check that the case is aligned, level and plumb.
Check evaporator fan for cleanliness.
Unplug/power off fan motor. Check motor shaft for bearing wear.
Check that fan motor is 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.
Fan Is Not Working Check that the MAIN power switch is on.
Check that fan connector is securely plugged in at fan shroud.
Check that fan connector is securely plugged in near close-off.
Check for foreign material obstructing fan performance.
Check that fan blade freely rotates within fan shrouds
Check that power is going to fans
Check that fan wiring is connected on terminal blocks.
Programmable
Controller Display
Is Blank
Check that the MAIN power switch is on.
Check circuit breaker box for tripped circuits.
Programmable
Controller Display Is
Flashing
See your case’s serial label for your model’s specified settings. See SERIAL
LABEL LOCATION & INFORMATION LISTED / TECH INFO & SERVICE for
label location, etc.
System Not Operating Check that the utility power is on.
Check that the MAIN power switch is on.
Check the circuit breaker box for tripped circuits.
Case Lights Are Not
Working
Check that light switch is in the on position.
Check that ALL of the light cords and plugs are properly connected. See LED
LIGHT FIXTURES section in this manual for specifics.
Service Technicians Only: Check voltage at LED drivers. If voltage is entering
but not exiting, LED driver may be faulty.
TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDER ONLY) - PAGE 2 of 3

18
CONDITION TROUBLESHOOTING
Weight Sensors On
Shelf/Shelves Are
Malfunctioning
Contact Instant Retail Services.
Color-Coded Lights
On Shelf/Shelves
Are Malfunctioning
Contact Instant Retail Services.
Screen/Monitor Is
Malfunctioning
Contact Instant Retail Services.
Payment Processor
Is Malfunctioning
Contact Instant Retail Services.
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. Please load case with pre-chilled product.
Temperature changes during defrost mode but will return to normal. Fourth LED
will indicate defrost cycle in progress.
Check that case is not directly in the sun.
Check that condenser coil has been cleaned.
Check air return opening for obstructions.
Check sight glass for flashing and/or low charge.
Check set point temperature; it may be adjusted too high.
Condensing Unit Is
Not Operating
Check that the power is turned on.
Check if programmable controller settings are properly set. See your case’s serial
label for your model’s specified settings. See SERIAL LABEL LOCATION &
INFORMATION LISTED / TECH INFO & SERVICE section in manual for label
location, etc.
TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDER ONLY) - PAGE 3 of 3

19
CONDITION TROUBLESHOOTING
Head Pressure Too
High
Check that the condensing coil is not dirty or covered.
Check that condensing fans are working.
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 recir-
culating.
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
If sight glass is part of condensing unit, check if it is flashing or showing low charge.
TROUBLESHOOTING - R-290 CONDENSING SYSTEM (BY TRAINED SERVICE PROVIDERS ONLY)

20
CONDITION TROUBLESHOOTING
Low Suction
Pressure
Check if sight glass (if present) 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 line / courtesy
loop is not kinked.
Check that evaporator fan motor is 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 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.
TROUBLESHOOTING - R-290 EVAPORATOR SYSTEM (BY TRAINED SERVICE PROVIDERS ONLY)