Structural Concepts COU2757R Operator’s Manual

READ AND SAVE THESE INSTRUCTIONS

INSTALLATION AND

OPERATING MANUAL

P/N 99523

SELF-CONTAINED REFRIGERATED SERVICE / SELF-SERVICE MERCHANDISERS

Model COU2757R

Shown at Right

Model COU2757R………..27 1/2”L* x 57”H x 33”D
Model COU2757R.3748…27 1/2”L* x 57”H x 33”D

Model COU2757R.4031....27 1/2”L* x 57”H x 33”D

Model COU2757R.5427....27 1/2”L* x 57”H x 33”D

*Includes end panels.

888 E. Porter Road · Muskegon, MI 49441 Phone: [phone] Fax: [phone] www.structuralconcepts.com

Operating Manuals\Oasis\COU2757R_3748_4031_5427_99523.pub

Rev M Date: 12.29.2014

TABLE OF CONTENTS

OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING ……….....………….

START-UP AND OPERATION ..….…………...…...…..…………………………………….…….…………

MAINTENANCE FUNDAMENTALS ….…………...….....……………..………………………………….…

ELECTRICAL & REFRIGERATION FUNDAMENTALS ……...………..……………………….………….

REFRIGERATION FUNDAMENTALS ………………………………………………………………………..

SERIAL LABEL LOCATION & INFORMATION LISTED / TECHNICAL INFO & SERVICE …………….

CLEANING SCHEDULE (TO BE PERFORMED BY STORE PERSONNEL) …………………………….

CLEANING SCHEDULE (TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY) .....…..

PREVENTIVE MAINTENANCE - HONEYCOMB AIR DIFFUSERS (TO BE PERFORMED BY
TRAINED SVC. PROVIDERS ONLY) …………………..…………………………………..……….

TROUBLESHOOTING (TO BE PERFORMED BY STORE PERSONNEL) ……………………..……….
TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY) ………..
TROUBLESHOOTING (BY TRAINED SERVICE PROVIDERS ONLY) - CONDENSING SYSTEM …..
TROUBLESHOOTING (BY TRAINED SERVICE PROVIDERS ONLY) - EVAPORATOR SYSTEM ….

ILLUSTRATED PARTS BREAKDOWN - COU2757R ……………………………………………………..
PARTS LIST - COU2757R ……………………………………………………………..……………………...
GENERAL LAYOUT OF CONDENSER PACKAGE ………………………………………………………..

CAREL® CONTROLLER - PROGRAMMING THE INSTRUMENT….…………………………….……....

CAREL® CONTROLLER - USER INTERFACE, SUMMARY TABLES OF ALARMS & SIGNALS …….
CAREL® CONTROLLER - Summary Table of Operating Parameters (After Programming Key) ……..

SCC TECHNICAL SERVICE CONTACT INFORMATION & LIMITED WARRANTY ……………………

3-4

5

6

7

8

9

10

11

12

13-14
15-17

18
19

20
21
22

23
24
25

26

2

OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING - PAGE 1 of 2

OVERVIEW

 The upper (service) section of this case is designed to

merchandise packaged/unpackaged, non-hazardous/
hazardous, product at ambient temperatures.

 The lower (self-service) section of this case is

designed to merchandise packaged/unpackaged,
non-hazardous/hazardous, product at 41 °F (5 °C) or
less product temperatures.

 Product must be pre-chilled at 41 °F (5 °C) or less

prior to being placed in refrigerated areas of case.

 Cases should be installed and operated according to

this operating manual’s instructions to ensure proper
performance.

 Improper use will void warranty.

TYPE I vs. TYPE II 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.

 Type II display refrigerators are 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 60% maximum humidity.

 If unsure if your unit is Type I or II, 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.

ATTENTION

CONTRACTORS

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.

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

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

Condenser Pan is Hot!

Disconnect or turn off unit and allow to cool

before cleaning or removing from case.

3

OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING - PAGE 2 of 2

PRECAUTIONS

 Following are important precautions to prevent

damage to unit or merchandise.

 Please read carefully!

 See previous page for specifics on OVERVIEW,

TYPE, COMPLIANCE and WARNINGS.

CAUTION! LAMP REPLACEMENT GUIDELINES

LED lamps reflect specific size, shape and overall design.

CAUTION

Any replacements must meet factory specifications.

Fluorescent lamps have been treated to resist breakage and

must be replaced with similarly treated lamps.

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.

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

CAUTION! ADVERSE CONDITIONS / SPACING ISSUES

 Performance issues caused by adverse conditions are NOT covered

by warranty.

 End panels must be tightly joined or kept at least 6-inches away from

any structure to prevent condensation.

 Unit must be kept at least 15-feet from exterior doors, overhead HVAC

vents or any air curtain disruption to maintain proper temperatures.

 Unit must not be exposed to direct sunlight or any heat source (ovens,

fryers, etc.).

 Tile floors, low ceilings or small rooms will increase noise level.

Whisper Cool compressor blanket or remote unit may resolve noise
level issues.

 Keep at least 8-inch clearance above unit for air discharge

(self-contained units only).

CAUTION! CHECK CONDENSATE PAN POSITION AND PLUG

Water on flooring can cause extensive damage!

 Condensate pan MUST BE positioned directly under condensate drain.
 Condensate pan plug MUST BE securely plugged into receptacle.

Before powering up unit, check the following:

4

START-UP AND OPERATION

Merchandiser Start-Up

 Do not use an extension cord with this appliance.
 Do not operate this equipment with a damaged

cord, plug or outlet.

 Insure the main power switch is off.
 Plug cord into a certified 110V electrical outlet

with ground.

 Turn main power on.

Remove upper front panel (See maintenance



for panel removal). Switch is on the right side
of case.

Coil fan should turn on.



From inside of the case, check for discharge air



from front baffle, to confirm that the fans are
functioning properly.

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 running time to pull-down temperature.
Turn lights on.



Light switch is a rocker type on the under right



side of the top light.
The lights should come on at the same time.



First time lighting may require a short warm-up
period for the bulbs. Slightly dim or a flickering
of new bulbs is normal.

It is recommended that the self-contained



refrigerated cases maintain front and rear airflow
clearance of approximately twelve inches.

 Obstruction or restriction of air can void warranty.

Note: Case temperature is set at the factory, as



determined by the case size.

Temperature is controlled by a thermostat.



If a temperature setting change is required,



refer to the instructions for the temperature
controller operating section of this manual.

Note: See serial label on case for set point.



Main Power Switch

Rocker Switch

ON

OFF

Light Switch

5

MAINTENANCE FUNDAMENTALS

Removing the Front Panel

 Lifting the panel from lower edge upward

approximately a half inch into a channel lip,

disengages the support taps on the lower edges.

 Pivot out lower edge approximately one inch

and lower panel to remove.

Removing the Front Grille

 Lifting the grille upward approximately a half inch

disengages a top support flange and the support
taps on the back lower side of the grille from the

frame .

 Pivot out lower edge and remove grille.

Removing the Rear Doors

 Move the rear doors toward the center of the

case.

 Individually lift each door up toward the top of

the case and pivot the bottom of the door out
from track.

Removing Interior Shelving:

 Remove the rear doors.
 Remove the glass or ABS shelving.
 Remove the rear shelf support from brackets.
 Remove shelf light from brackets and rotate to

facilitate maintenance.

 Note: shelf light cannot be remove without

being disassembled.

 Shelf brackets can not be removed.

Light Fixture

Removal of lamp:

 Rotate lamp (1/4 turn) and remove bulb.

Installation of lamp:

 Align pins with slot.
 Insert pins into socket and rotate 1/4-turn to

secure pin contacts in socket.

Channel Lip

Upper Front Panel

Support Tabs

Support Flange

Support Tabs

Glass or ABS Shelves

Shelf Light

Front Grille
Support Rest

Rear Shelf Support

Sample Fluorescent Light Fixture

Shelf Brackets

6

ELECTRICAL & REFRIGERATION FUNDAMENTALS

Electrical: Access and Connections
Warning, disconnect power before providing

maintenance and service to unit.

Ballast access

 Remove 4 screws from the back of the top cap

to access electrical connections and ballasts.

Temperature & Defrost Control

 The case temperature is set at the factory, as

determined by the case size. The temperature
is controlled by a thermostat. If a temperature
setting change is required, follow the

instructions for the Carel® Controller in the

technical information section of this operating
manual.
If service is required to the temperature



control unit, call Structural Concepts. This
maintenance should be performed by a
certified technician.

Ballast

Top Cap Rocker Switch

Temperature

Controller

Approximate Ballast

locations (illustration may

not be exactly as shown)

7

REFRIGERATION FUNDAMENTALS

Evaporator fan access

 Remove lower decking. A finger hole is provided

to assist in lifting up and pulling out deck.

Expansion valve access

 Remove lower decking. A finger hole is provided

to assist in lifting up and pulling out deck.

 Remove fan shroud assembly.

 Unplug the fan at the shroud support.
 Remove four screw knobs from the fan

shroud.

 Carefully remove shroud to avoid damage to

mirrors or front air deflector.

Refrigeration:
Access and Connections

 Assembly or disassembly and servicing to

be accomplished by licensed refrigeration
contractor.

 Refer to maintenance fundamentals for access.

 Remove front panel.
 Remove front grill.

Fan

Shroud

Lower Decking

Evaporator

Fan

Hot Gas Evaporator

8

Refrigerant Service Fittings

Front of Case

Carel Controller®

Sight Glass

SERIAL LABEL LOCATION & INFORMATION LISTED / TECHNICAL INFO & SERVICE

Serial Label Location & Information Listed / Technical Information & 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 image below for sample serial label.

Y

S

A

S

A

M

M

P

P

L

L

E

E

O

N

O

L

N

L

Y

A

S

----- Sample Serial Label For Refrigerated Case -----

S

A

M

S

P

A

L

M

LE

P

M

E

P

O

L

E ON

Y

L

N

O

N

L

Y

L

Y

9

CLEANING SCHEDULE (TO BE PERFORMED BY STORE PERSONNEL)

WARNING! TURN OFF POWER TO CASE BEFORE PERFORMING PREVENTIVE MAINTENANCE!

Freq. Instructions
Daily

Daily

Weekly

Weekly

Weekly

Daily

Weekly

Glass / Mirrors: Clean with household or commercial glass cleaner.
Acrylic: Clean with a warm water and mild soap solution and soft cloth. Never use ammonia-based

cleaners (or regular glass cleaner) on acrylic.

Magnetic Condenser Coil Filter (Self-Contained Units Only):

 This filter helps prevent dust particles from entering condenser coil. It is accessible at rear.
 Clean magnetic condenser coil filter by following either of these steps:

1. As magnetic condenser coil filter is dishwasher safe, remove from case (no screw
removal required) and use a rag or soft-bristled brush to wipe off excess dust particles
from filter. Run in normal dishwasher cycle. Remove from dishwasher. Dry with soft
cloth or paper towel. Return to case.

2. If not using dishwasher, remove magnetic condenser coil filter from case. Use a rag or
soft-bristled brush to wipe off excess dust particles from filter. Submerse in warm,
soapy water. Use soft-bristled brush to remove dust, dirt, grease and grime that may
collect on filter. Rinse thoroughly.

Condensing Coil: Remove base panel and condensing coil cover. Vacuum or brush condenser coil

with metal or fiber brush to remove dust and dirt. Be careful to avoid damaging coil fins while cleaning!

Rear Sliding Doors and Door Track: Remove rear doors. Clean w/household or commercial cleaner.

Clean out door track with moist cloth.

Decks & Inserts: Wipe down and clean with mild soap, water & soft cloth.

Baffle: Remove from case. Clean with soft-bristled brush. See photos A - B - C below.
Weekly
Weekly

Magnetized Condenser

C. Baffle (Enhancing

Refrigerating

Crumb Drawer: Pull out and empty. Clean with moist cloth. See photo B below.

Decks & Inserts: Remove and clean with mild soap, water & soft cloth

Coil Filter

A. Baffle (Preventing
Refrigeration) & Crumb Tray
(shown not

pulled out)

B. Baffle (out of

case) & Crumb

Tray (pulled out)

10

CLEANING SCHEDULE (TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY)

WARNING! TURN OFF POWER TO CASE BEFORE PERFORMING PREVENTIVE MAINTENANCE!

Freq. Instructions

Qtly

Condensing Coil: Using air pressure or an industrial strength vacuum, clean the dust and dirt that

may collect on the condenser coil. It may be necessary to use a soft-bristled brush to loosen up
caked dust and debris that may form on coil.

Qtly

Under Case Cleaning: Once refrigeration package is clear of unit, vacuum under case to remove
all dust and dirt that may collect.

Qtly

Tub, Coil and Drain: Remove evaporator fan panel (as shown in images #1 and 2 below) and

clean tub, coil and drain with warm water and mild soap solution. Remove debris clogging drain.

Qtly

Compressor Area: Slide out from case. Wipe off dust & debris with moist cloth.

Hot Gas Loop (or Electric Coil) Condensate Pan / Refrigeration Package: Caution! You must

turn off main power switch before cleaning!

 Remove front panel. Turn main power switch off.
 Slide refrigeration package out from under rear of case.
 Use a scrub-brush and a non-corrosive de-scaling solution (to remove calcium, lime and rust)

to clean hot gas loop condensate evaporator pan. Follow instructions as to proper dilution,
safety precautions and scrubbing method.

 After thoroughly cleaning pan with scrub-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 fans, sight glass, overflow pan, etc.
 Slide condenser package back under case.
 Return rear panel to case.

Qtly

Fan Blades, Shroud, Drain: Wipe down each blade and shroud with moist cloth. Clean out drain.

See images #1 and 2 below.

Qtly

Qtly

Honeycomb: See PREVENTIVE MAINTENANCE - HONEYCOMB AIR DIFFUSERS (TRAINED

SERVICE PROVIDERS ONLY) section in this manual for specifications.

Upper and Lower Step Inserts: Remove from Case. Wipe down with damp cloth.

Image #1

Use finger holes to lift up

Deck. Remove from case.

Clean under air return grille and fan shroud

area with moist cloth. Remove drain

cleaning access door and clean drain.

Image #2

11

PREVENTIVE MAINTENANCE - HONEYCOMB AIR DIFFUSERS (TRAINED SVC. PROVIDERS ONLY)

Honeycomb Air Diffuser Removal

See PREVENTIVE MAINTENANCE (TO BE
PERFORMED BY TRAINED SERVICE PROVIDER)

section in this manual for cleaning frequency.

A. Wedge a non-metallic device of suitable strength
(such as a ballpoint pen) between the honeycomb
and the end panel.

Caution

! Use care not to dislodge the heating wire

(that prevents condensation on the lamp assembly).

B. Apply pressure to collapse the honeycomb to
allow it to be pulled out of honeycomb retainer.
C. Carefully pry downward and away from the
honeycomb retainer. Remove entirely from case.

C

A

Clean honeycomb with warm water and soap
solution. Submerse if necessary. Use brush to
dislodge stubborn or sticky residue. Dry by using
vacuum’s blow mode (vs. suction mode).

Honeycomb Air Diffuser Installation

D. Squeeze honeycomb to allow it to fit into the
honeycomb retainer.
E. Carefully slide honeycomb into place.
F. Adjust honeycomb so that it fits flat

against

retainer. It must not be wavy or out of position.

Note: For honeycomb air diffusers in other

locations, these same general instructions apply.

F

B

Location of

Honeycomb Air

Diffuser

D

E

12

TROUBLESHOOTING (TO BE PERFORMED BY STORE PERSONNEL) - PAGE 1 of 2

Product is Drying Out

Water on the Floor

Excessive Fan Noise
System is not Operating

Alarm is Flashing (or Sounding)
Digital Control Display is Blank

Fans Not Working

Check the relative humidity in the store.

Check that the drain is correctly positioned over condensate pan.

Check that condensate overflow pan is plugged in.

Check that drain and drain trap do not have debris in them.

Check that the case is aligned, level and plumb.

Check that the utility power is on.

Check that the MAIN power switch is on.

Check the circuit breaker box for tripped circuits.

See alarm and fault codes

Check that the MAIN power switch is on.

Check the circuit breaker box for tripped circuits.

Check that the MAIN power switch is on.

Case Lights Not Working

Check that ALL of the lights are plugged in.

Check bulbs for proper installation and connection.

Check for burned out bulbs.

Clean dirt and dust from the bulbs to prevent flickering.

Check that light switch is in the on position.

13

TROUBLESHOOTING (TO BE PERFORMED BY STORE PERSONNEL) - PAGE 2 of 2

Controller Display Flashing

Not Holding Temperature

Note: Keep product off front air grilles! Product displayed on

Condensing Unit Not Operating

If display is flashing, refer to Carel® Temperature Controller Section
in this manual.

If a large amount of warm product was added to the case, it will take
time for the temperature to adjust. Unit needs pre-chilled product.

The temperature will change during defrost cycle but will return to
normal when compressor turns on.

Check to see if the condenser coil has been cleaned.

Check that the case is not in the sun or near a heat or

air-conditioning vent. See OVERVIEW / TYPE / COMPLIANCE /
WARNINGS / PRECAUTIONS / WIRING section in this manual for

specifics.

Check air grilles for obstruction and remove.

Ensure that front air grilles are not obstructed by product or other
décor.

front air grilles will cause case to run warm and will negate
warranty.

Check that the main power switch is turned on.

Controller may be in defrost mode. Compressor cycling on and off is
a normal condition. See Carel® Temperature Controller Section in
this manual.

Check if the case is on and the control display is blank. If blank,
contact technical support (see toll-free number at end of manual).

14

TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY) - PAGE 1 of 3

CONDITION TROUBLESHOOTING

Water Is On The
Floor

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 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.

Check that the drain trap is free of debris.

Check that the drain hose is correctly positioned over condensate pan (or floor drain,

for remote units).

Check store conditions. To prevent condensation in Type I environments, maximum
conditions are to be 55% humidity / 75° Fahrenheit. For Type II, maximum conditions
are to be 60% humidity / 80° Fahrenheit. See serial label (at case rear near main
power switch) for Type of your case.

Check that evaporator pan is properly plugged in or connected.

15

TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY) - PAGE 2 of 3

CONDITION TROUBLESHOOTING

Fan Emits Excessive
Noise

Fans Are Not Working

Check that the case is aligned, level and plumb.

Check evaporator fan for cleanliness.

Unplug/power off fan motors. Check motor shaft for 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.

Check that the MAIN power switch is on.

Check that fans are plugged in at the fan shroud.

Digital Control Display
Is Blank

System Not Operating

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.

Check that the MAIN power switch is on.

Check the circuit breaker box for tripped circuits.

Check that the utility power is on.

Check that the MAIN power switch is on.

Check the circuit breaker box for tripped circuits.

16

TROUBLESHOOTING (TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY) - PAGE 3 of 3

CONDITION TROUBLESHOOTING

Case Lights Are Not
Working

Control Display Is
Flashing

Case Is Not Holding
Temperature

Check that light switch is on. See START-UP AND OPERATION in this manual for

location.

Check that ALL of the light cords and plugs are properly connected. See
MAINTENANCE FUNDAMENTALS section in this manual.

Check voltage at ballast (or driver). If voltage is entering but not exiting, ballast (or

driver) may be faulty.

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.

If a large amount of warm product was added to the case, it will take time for the
temperature to adjust. Unit needs product to be pre-chilled.

Temperature changes during defrost mode but will return to normal. Fourth LED
will indicate defrost cycle in progress.

Check that case is not in sun or near a heat or air-conditioning vent. See

OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS / WIRING

section in manual for adverse conditions/spacing issue parameters.

Condensing Unit Is
Not Operating

If case is located near front doors, temperature fluctuation can hinder unit’s ability

to maintain temperature. See OVERVIEW / TYPE / COMPLIANCE / WARNINGS /
PRECAUTIONS / WIRING section in manual for adverse conditions/spacing issue

parameters.

Check that magnetized condenser coil air filter (attached to rear grille) has been

cleaned. See GENERAL CLEANING (TO BE PERFORMED BY STORE
PERSONNEL) section in operating manual for instructions.

Check that condenser coil has been cleaned.

Check air return grilles for obstructions.

Check sight glass for flashing and/or low charge.

Check Set Point Temperature; it may be adjusted too high.

Check that the power is turned on.

Determine if temperature 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.

17

TROUBLESHOOTING (BY TRAINED SERVICE PROVIDERS ONLY) - CONDENSING SYSTEM

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
recirculate.

Head Pressure Too Low

Check that store ambient temperature isn’t above maximum allowed. See

OVERVIEW / TYPE / COMPLIANCE / WARNINGS / PRECAUTIONS /
WIRING / PLUGS section in this manual.

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.

18

TROUBLESHOOTING (BY TRAINED SERVICE PROVIDERS ONLY) - EVAPORATOR SYSTEM

CONDITION TROUBLESHOOTING

Low Suction Pressure

High 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.

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.

19

ILLUSTRATED PARTS BREAKDOWN - MODEL COU2757R & COU2757R.3748

NOTE: DUE TO OPTIONS AND FEATURES THAT MAY BE CHOSEN

BY CUSTOMER, ILLUSTRATED PARTS BREAKDOWN SHOWN

MAY NOT EXACTLY REFLECT YOUR PARTICULAR MODEL.

20

21

22

23

1

2

3

4

5

6

7

8

9

10

11

12

19

13

14

15

18

16

17

20

PARTS LIST - MODEL COU2757R & COU2757R.3748

1 Top Cap 13 Front Panel

2 Rocker Switch 14 Bumper Insert

3 End Glass 15 Front Grille

4 Shelf, Glass 16 Bumper End Cap

5 Curved Front Glass 17 Temperature Controller

6 Shelf Light 18 Fan Motor, Evaporator

7 Lamp Bulb 19 Deck Pan

8 ABS Decks 20 Rear Grille

9 End Panel 21 Rear Door

10 End Panel Mirror 22 Rear Rack Support

11 Air Deflector Glass 23 Ballast

12 Single Pole Switch

21

GENERAL LAYOUT OF CONDENSER PACKAGE

Note: Condenser Package Layout Shown Below is Used Primarily on

Model COU2757R Units. Illustration Shown May Not Exactly

Reflect Every Feature or Component of Your Unit.

Condenser Coils

Condenser Fan Motor,
Fan Blades and Guard

Receiver

Evaporator Pan

(and Hot Gas Loop)

Compressor

Compressor

Electrical Box

22

Sight

Glass

Filter Dryer

Read And Save These Instructions - Page 1 of 3

Integrated Electronic

Microprocessor Controller

Programming The Instrument

To Modify The Setpoint

Press and hold the “SET” key for at least 1 second.

Set

Prg

mute

Set

▲

aux

def

▼

▲

aux

3. Quickly press and release the “SET” key again.

Set

To Modify Defrost, Differential, Other Parameters

Prg

mute

2. Confirm by pressing “SET” key.

Set

▲

aux

4. Press “SET” to modify this selected parameter.

Set

▲

aux

Set

7. Press & hold the “Prg” key for at least 5 seconds

Prg

to save changes. This action will also mute the

mute

audible alarm (buzzer) & deactivate the alarm relay.

2. Use arrow keys ▲ ▼ on temperature

def

controller to increase (or decrease) the

▼

setpoint.

1. Press & hold “Prg” & “SET” keys together
for five (5) seconds; display will flash “0”,

Set

representing password prompt.

3. Press ▲ or ▼ to reach the

def

category to be modified.

▼

5. Increase or decrease the value using

def

the ▲ or ▼ button respectively.

▼

6. Press the “SET” key to temporarily save the new
value and return to the display of the parameter.

Prg

mute

Set

▲

aux

Set

▲

aux

Set

Prg

mute

Warning! Save Your Parameter Settings!

1. To store the new parameter values, PRESS and HOLD the “Prg” key for at least 5 seconds.

2. All modifications made to parameters will be lost if you do NOT press a button within 60 seconds. Should
this “timeout” occur, normal operational settings (prior to modifications being made) will resume.

3. If the instrument is switched off before pressing the “Prg” key, all modifications to parameters will be lost.

How To Change Reading From

Fahrenheit (°F) To Celsius (°C)

1. Press and hold “Prg” and “SET” keys

Set

together for at least 5 seconds; display

2. Confirm by pressing “SET” key.

4. Press “SET” to modify this selected
parameter.

6. Press “SET” key to temporarily save the
new value and return to the display of the
parameter.

will show “0” (password prompt).

def

3. Press ▲ or ▼ until reaching the
parameter “/ 5”.

▼

5. Press ▲ or ▼ to change value to

def

desired setting: “0” for Celsius (°C) or

▼

“1” for Fahrenheit (°F).

7. Press & hold “Prg” key for at least 5
seconds to save changes. Note! All values

will automatically convert to new scale. No
conversion is required.

To Activate Manual Defrost

def

Press and hold “def” key for at least 5 seconds.

▼

To Activate / Deactivate Auxiliary Output

▲

Press and hold the “aux” key for 1 second.

aux

23

Prg

mute

To Reset Any Alarms With Manual

▲

Reset

aux

Press and hold the “Prg” and “aux”

key for at least 1 second.

Oper Manuals - PUB\Templates\Carel Controller\Carel Controller IR33.pub

This data derived from Carel Material: ir33 +030220441 - rel. 2.0 - 01.05.2006

Read And Save These Instructions - Page 2 of 3

Integrated Electronic

Microprocessor Controller

User Interface - Display

Summary Table of Alarm and Signals: Display, Buzzer and Relay

reset alarms w/manual reset / reset HACCP alarms / reset temp. monitoring

24

Read And Save These Instructions - Page 3 of 3

Integrated Electronic

Microprocessor Controller

Summary Table of Operating Parameters

CODE PARAMETER UOM* TYPE MINIMUM MAXIMUM DEFAULT

/5

Select Celsius (°C) or Fahrenheit (°F)

flag C 0 1

/c1 Calibration of probe 1 °C/°F C -20 20

/c2 Calibration of probe 2 °C/°F C -20 20

St Temperature set point °C/°F F r2 r1

rd Control delta °C/°F F 20 0.1

dl Interval between defrosts hours F 0 250

dt1 End defrost temperature, evaporator °C/°F F -50 200

dP1 Maximum defrost duration, evaporator min F 1 250

d6 Display on hold during defrost - C 0 2

For Case

Specific

Defaults

See Serial

Label

Located

Near

Electrical

Access

On Your

Case.

For
Additional
Technical

Information

Call

Structural

Concepts

Technical

Service

Dept. at

1(800)

433.9489

dd Dripping time after defrost min F 0 15

d/1 Display of defrost probe 1 °C/°F F - -

* Unit Of Measure

25

SCC TECHNICAL SERVICE CONTACT INFORMATION & WARRANTY INFORMATION

STRUCTURAL CONCEPTS CORPORATION TECHNICAL SERVICE

PHONE NUMBER: 1.800.433.9489 or For Your Master Service Agent See

WWW.STRUCTURALCONCEPTS.COM/Contact/Master_Service_Agents.asp

LIMITED WARRANTY

All sales by Structural Concepts Corporation (SCC) are subject to the following limited warranty. “Goods” refers to the product or products being sold by SCC.

Warranty Scope: Warranty is for equipment sold in the United States, Canada, Mexico and Puerto Rico. Equipment sold elsewhere may carry modified warranty.
Warranty; Remedies; Limitations. The limit of liability of SCC toward the exchange cost of the original compressor motor (and/or any other components) is one year parts and

labor. If any Goods are found to be of faulty material or workmanship within one year of the original F.O.B. unit shipment, SCC will, at its option (after inspection by an authorized
representative), replace or pay the reasonable cost of replacement of the faulty Goods. If warranty claim is not made within this one year time period, SCC is not bound to warrant
Goods. A motor-compressor (and/or any other components) replaced during the warranty shall not exceed manufacturer's current established wholesaler’s exchange price. If
replacement motor-compressor (and/or other components) is available via storage facility, parts truck, etc., SCC mandates that readily accessible replacement components be
used toward repair of Goods; in such instances, SCC will replace such equipment (at its own expense) after confirmation of its use/placement on defective unit. SCC shall not be
charged an additional fee, up-charge or expense for such replacement Goods. If SCC is unable to repair or replace the defective Goods, SCC shall issue a credit to the
Purchaser for full or partial purchase price, as SCC shall determine. The replacement or payment in the manner described above shall be the sole and exclusive remedy to
Purchaser for a breach of this warranty. If any Goods are defective or fail to conform to this warranty, SCC will furnish instructions for their disposition. No Goods shall be returned
to SCC without its prior consent.

SCC’s liability for any defect in the Goods shall not exceed the purchase price of the Goods. SCC SHALL HAVE NO LIABILITY TO PURCHASE FOR CONSEQUENTIAL
DAMAGES OF ANY KIND WHATSOEVER, INCLUDING, BUT NOT LIMITED TO, PERSONAL INJURY, PROPERTY DAMAGE, LOST PROFITS, OR OTHER ECONOMIC
INJURY DUE TO ANY DEFECT IN THE GOODS OR ANY BREACH OF SCC, SCC SHALL NOT BE LIABLE TO THE PURCHASER IN TORT FOR ANY NEGLIGENT DESIGN
OR MANUFACTURE OF THE GOODS, OR FOR THE OMISSION OF ANY WARNING THEREFROM.

SCC shall have no obligation or liability under this warranty for claims arising from any other party’s (including Purchaser’s) negligence or misuse of the Goods or environmental
conditions. This warranty does not apply to any claim or damage arising for or cause by improper storage, handling, installation, maintenance, or from fire, flood, accidents,
structural defects, building settlement or movement, acts of God, or other causes beyond SCC’s control.

Except as expressly stated herein, SCC makes no warranty, express, implied, statutory or otherwise as to any parts or goods not manufactured by SCC. SCC shall warrant such
parts or Goods only (I) against such defects, (II) for such periods of time, and (III) with such remedies, as are expressly warranted by the manufacturer of such parts of Goods.
Notwithstanding the foregoing, any warranty with respect to such parts of Goods and any remedies available as a result of a breach thereof shall be subject to all of the
procedures, limitations, and exclusions set forth herein.

THE WARRANTIES HEREIN ARE IN LIEU OF ALL WARRANTIES, EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE. IN PARTICULAR, SCC MAKES NO WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

No representative, agent or dealer of SCC has authority to modify, expand, or ext end this Warranty, to waive any of the limitations or exclusions, or to make any different or
additional warranties with respect to Goods.

Period of Limitations. No claim, suit or other proceeding may be brought by Purchaser for any breach of the foregoing warranty or this Agreement by SCC or in any way arising
out of this Agreement or relating to the Goods after one year from the date of the breach. In the interpretation of this limitation on action for a breach by SCC, it is expressly
agreed that there are no warranties of future performance of the goods that would extend that period of limitation herein contained for bringing an action.

Indemnifications. Purchaser agrees to indemnify, hold harmless, and defend SCC if so requested, from any and all liabilities, as defined herein, suffered, or incurred by SCC as
a result of, or in connection with, any act, omission, or use of the Goods by Purchaser, its employees or customers, or any breach of this Agreement by Purchaser. Liabilities
shall include all costs, claims, damages, judgments, and expenses (including reasonable attorney fees and costs).

Remedies of SCC. SCC’s rights and remedies shall be cumulative and may be exercised from time to time. In a proceeding or action relating to the breach of this Agreement by
Purchaser, Purchaser shall reimburse SCC for reasonable costs and attorney’s fees incurred by SCC. No waiver by SCC of any breach of Purchaser shall be effective unless in
writing nor operate as a waiver of any other breach of the same term thereafter. SCC shall not lose any right because it has not exercised it in the past.

Applicable Law. This Agreement is made in Michigan and shall be governed by and interpreted according to Michigan law. Any lawsuit arising out of this Agreement or the Goods
may be handled by a federal or state court whose district includes Muskegon County, Michigan, and Purchaser consents that such court shall have personal jurisdiction over
Purchaser.

Miscellaneous. If any provision of this Agreement is found to be invalid or unenforceable under any law, the provision shall be ineffective to that extent and for the duration of
the illegality, but the remaining provisions shall be unaffected. Purchaser shall not assign any of its rights nor delegate any of this obligations under this Agreement without prior
written of SCC. This Agreement shall be binding upon and inure to the benefit of SCC and Purchaser and each of their legal representatives, successors and assigns.

SCC warrants its products to be free of defects in materials and workmanship under normal use and service for a period of one (1) year from the date of delivery.

This warranty is extended only to the original purchaser for use of the Goods. It does not cover normal wear parts such as plastic tongs, tong holders, tong cables, bag holders,
or acrylic dividers.

General Conditions. All service labor and/or parts charges are subject to approval by SCC. Contact the Customer Service Department in writing or call 231-798-8888.

All claims must contain the following information: (1) model & serial code number of equipment; (2) the date and place of installation; (3) the name and address of the agency
which performed the installation; (4) the date of the equipment failure; and (5) a complete description of the equipment failure and all circumstances relating to that failure.

Once the claim has been determined to be a true warranty claim by SCC’s Customer Service Department, the following procedure will be taken: (1) replacement parts will be sent
at no charge from SCC on a freight prepaid basis; (2) reimbursement for service labor will be paid if the following conditions have been met - (a) prior approval of service agency
was awarded from the Customer Service Department; and (b) an itemized statement of all labor charges incurred is received by th e Customer Service Department. The cost of
the service labor reimbursement will be based on straight time rates and reasonable time for the repair of the defect.

If problems occur with any compressor, notify SCC’s Customer Service Department immediately. Any attempt to repair or alter the unit without prior consent from the Customer
Service Department will render any warranty claim null and void. This warranty and protection plan does not apply to any condensing unit or any part thereof which has been
subject to accident, negligence, misuse, or abuse, or which has not been operated in accordance with the manufacturer’s recommendations or if the serial number of the unit has
been altered, defaced, or removed.

One Year Limit of Liability. After SCC's one-year parts and labor warranty on the original F.O.B. unit has expired, SCC is not liable for either the equipment or labor costs of
repairing or replacing the motor compressor, nor any other components that were included in the original F.O.B. unit.

26

SCC Warranty Revision E Date: 5.5.2014