Carrier CMCT Series User manual

SERVICE &
INSTALLATION
MANUAL
CARRIER COMMERCIAL REFRIGERATION, INC.
Providing BEVERAGE-AIR • FRIGIDAIRE • KELVINATOR • UNIVERSAL NOLIN Products/Services
Frozen Food
& Ice Cream
Merchandisers
CMCT
2/03 51-1021-01

If additional information is necessary, call the factory.
Our toll free number is 1-800-684-1199.Technical assis-
tance engineers are willing to assist you in any way possi-
ble. Office hours are from 8:00a.m. to 5:30 p.m., Eastern
Standard Time.
Important information is contained in this manual which should
be retained in a convenient location for future reference.
All data and information in this manual is subject to change without notice.
MODEL DESIGNATION INFORMATION
115V, 60HZ
PAR T # MODEL # DATA PLATE
52-2038-01 CMCT4-4 SL12/CMCT4
52-2038-03 CMCT6-4 SL20/CMCT6
52-2038-05 CMCT8-4 SL28/CMCT8
52-2038-06 CMCT10-4 SL36/CMCT10
EXPORT 220V, 50HZ
PAR T # MODEL # DATA PLATE
52-2040-01 ECMCT4-4 ECMCT4
52-2040-02 ECMCT6-4 ECMCT6
52-2040-04 ECMCT8-4 ECMCT8

SECTION I
Introduction

CMCT Merchandisers – Introduction
These cabinets are produced for the merchandising of frozen
food and ice cream markets. They range in size from 4' to 10'
in length. Operating ambients range from 70ºF. to 85ºF. with
cavity temperatures at load line between 0ºF. to -20ºF.
Except for routine cleaning, these cabinets will require little
maintenance. In the unusual event that repair should be
necessary, this manual presents information that is helpful in
maintaining, diagnosing, and repairing these cabinets.
INTRODUCTION 3

TABLE OF CONTENTS
4TABLE OF CONTENTS
Due to the manufacturer’s policy of continuous quality improvement, specifications are subject to change without notice.
INTRODUCTION
Introduction .................................................................... 3
Table of Contents ............................................................ 4
Specifications & Illustrations ............................................ 5
Handling & Installation .................................................... 6
Cleaning Instructions........................................................ 7
Cabinet Operation ............................................................ 7
Electrical Data .................................................................. 9
Refrigeration/Electrical Specs. (R404A)............................ 10
Refrigeration/Electrical Data Export Models...................... 11
Wiring Diagram CMCT Models 4, 6 & 8 .......................... 12
Wiring Diagram CMCT Models 10 .................................... 13
Wiring Diagram ECMCT Models 4, 6 & 8 (Export) .......... 14
Lamp Wiring Detail (Upper Raceway) .............................. 15
MAINTENANCE & REPAIR
Cabinet Temperature Control ............................................ 19
Electrical Box Layout ........................................................ 20
Defrost Timer Layout........................................................ 21
Cabinet Electrical Supply .................................................. 22
Condensing Unit Assembly .............................................. 23
Condensing Unit Layout.................................................... 24
Unit Compartment - Rear.................................................. 25
Evaporator Tubing Illustration .......................................... 26
New Lubricants ................................................................ 27
Back Pressure Valve ........................................................ 28
Light Channel Assembly .................................................. 29
Baffle Heater comp. ID & Removal .................................. 30
End Panel Breaker & Heater Removal .............................. 31
Refrig. Upper Section Comp. ID & Removal .................... 32
Upper Cross Section ........................................................ 33
Front Glass Heater Replacement ...................................... 34
Countertop........................................................................ 35
Evaporator Coil Removal .................................................. 36
Troubleshooting Guide...................................................... 38
PAR TS LISTS
CMCT Cabinet Exterior Parts ID ...................................... 40
Parts List CMCT-4, 6, 8 & 10............................................ 41
Parts List EMCT-4, 6 & 8.................................................. 42

Specifications - Specifications Subject to Change without Notice.
CMCT-4 CMCT-6 CMCT-8 CMCT-10
Temperature Range 0° to -20°F 0° to -20°F 0° to -20°F 0° to -20°F
Insulation 21⁄2" Urethane Foam in Place 21⁄2" Urethane Foam in Place 21⁄2" Urethane Foam in Place 21⁄2" Urethane Foam in Place
Number of Lids 2234
Lid Construction 3/16" Glass Radiant Heated 3/16" Glass Radiant Heated 3/16" Glass Radiant Heated 3/16" Glass Radiant Heated
Capacity 11 cu. ft. 19 cu. ft. 27 cu. ft. 35 cu. ft.
Capacity (1/2 gallons) 120 225 322 435
Novelty Baskets Load Level 10 14 20 26
Capacity Novelty Baskets Total 16 24 36 48
Shipping Weight (Approx.) 486 lbs. 624 lbs. 780 lbs. 874 lbs.
Compressor Size 1/2 HP 1/2 HP 3/4 HP 1 HP
Condenser Type Bare Tube Forced Air Bare Tube Forced Air Bare Tube Forced Air Fin & Tube Forced Air
Evaporator Type Fin & Tube Gravity Coil & Cold Wall Fin & Tube Gravity Coil & Cold Wall Fin & Tube Gravity Coil & Cold Wall Fin & Tube Gravity Coil & Cold Wall
Refrigerant Type R404A R-404A R-404A R-404A
Refrigerant Control Capillary Capillary Capillary Capillary
Defrost System Electric Electric Electric Electric
Rated Amps 8.0 8.0 12 4.8 (11V0/6.7 (230V)
Electrical Specs. (V/Hz/Ph) 115/60/1 115/60/1 115/60/1 115 & 230/60/1
Power Cord 15 Amp Cord 15 Amp Cord 15 Amp Cord Conduit Connected / Max. Fuse
with 5-15P NEMA Plug with 5-15P NEMA Plug with 5-15P NEMA Plug Size 15A Min. Circuit Ampacity 15A
NSF-7 (Ice Cream Storage) Yes Yes Yes Yes
UL & CUL Listed Yes Yes Yes Yes
Interior Finish White Baked Enamel White Baked Enamel White Baked Enamel White Baked Enamel
Exterior Finish White Baked Enamel White Baked Enamel White Baked Enamel White Baked Enamel
Lighted Sign Standard Standard Standard Standard
INTRODUCTION 5
481/16 (CMCT4)
721/16 (CMCT6)
961/16 (CMCT8)
1201/16 (CMCT10)
423/4 (CMCT4)
663/4 (CMCT6)
783/4 (CMCT8)
1143/4 (CMCT10)
INSIDE
329/16
19
253/4
INSIDE
383/4

FREIGHT DAMAGES AND SHORTAGES
The cabinet was inspected and
packaged at the factory, and should
arrive in excellent condition.The transportation company
or other parties involved in the shipment are responsible
for loss and/or damage. Always make an inspection
before and after uncrating. Inspect the crated unit(s)
before locating (preferably at the point of unloading by
the transportation company).
INSPECTING FOR DAMAGES
Always use care when removing shipping
tape, blocks, pads, hardware or other material
until you are satisfied that the unit is completely opera-
tional.
Check the cartons or containers. If these are damaged
in any way, open them and inspect the contents in the
driver’s presence. If damage is detected:
1. Have the driver note the nature and extent of the
damage on the freight bill.
2. Notify the transportation company’s office to request
an inspection. Carrier claim policies usually require
inspections to be made within 15 days of delivery.
3. If damage is noticed, file a claim with the transporta-
tion company.
FILING A CLAIM
File a claim for loss at once with the transportation
company for:
A. A cash adjustment; B. Repairs; or C. Replacement
When filing your claim, retain all packaging materials
and receipts.
HANDLING THE CABINET
The refrigeration system of the cabinet is
designed to operate with the cabinet located
on a level surface. Do not tilt the cabinet more than
10° to any side. If the cabinet must be tilted on an
angle for handling or moving purposes, allow it to sit in
an upright position 30 minutes prior to starting.
CHOOSING A LOCATION
This model cabinet should be situated to allow proper air
circulation. Cabinets require a 2" minimum clearance
behind for proper air circulation.
The cabinet must be installed on a sturdy, solid, level
floor.
The cabinet must be located so it can be plugged or
wired into a properly grounded three-prong electrical
outlet of 115/220 volt, 60 hz.The electrical outlet should
not be controlled by a wall switch which might be turned
off accidentally.
UNCRATING THE CABINET
The cabinet should be moved as close as possible to
the operating location before removing crate base. Be
sure to follow the steps in the “INSPECTING FOR
DAMAGES” instructions.
INSTALLING THE CABINET
After removing the skid from the cabinet, slide cabinet
into location.Level cabinet to insure proper draining of
the defrost water.
To meet NSF requirements, these cabinets must be
sealed to the floor with an NSF or FDA approved
sealant.
Remove the front grill from cabinet. Remove front hold
down bolts and pull unit out of cabinet. Remove ship-
ping band from compressor. Be sure that the compres-
sor “floats” freely on the compressor springs. Check
refrigeration lines to see that they are “free” and no
damage was done in shipping.Check fan blade for free
operation.
Check voltage and amp draw on the serial plate to
determine proper fuse and line size.Voltage should be
checked at the compressor terminals as the compres-
sor is starting, to determine if there is excessive “volt-
age drop.” This voltage drop should not exceed 10% of
the rated compressor voltage. If the voltage reads 115
or 230 with no load and it drops below 103 or 208 when
the compressor tries to start, it is an indication that the
supply wiring is too small in size or too long in length.
It is recommended that a separate circuit be run for each
cabinet to prevent the possibility of another appliance
blowing a fuse causing subsequent loss of product.
SECTION I – HANDLING & INSTALLATION
6INTRODUCTION
NOTE:
IMPORTANT:
NOTE:

CLEANING INSTRUCTIONS
CLEANING THE CABINET EXTERIOR
Wipe the exterior occasionally with a cloth dampened in
mild detergent water; rinse, and wipe dry with a soft,
dry cloth. Do not use abrasive or caustic cleaners or
scouring pads.
CLEANING THE CONDENSER
Periodic cleaning of the condenser can be easily
accomplished by brushing the coils with a soft brush
and/or using a vacuum cleaner with a brush attach-
ment.
Be sure that dirt, dust, and a collection of other debris
do not build up to a point that air circulation through the
condenser is restricted.
CLEANING THE STORAGE COMPARTMENT
1. Remove product and store it in another suitable cab-
inet, if possible. Be sure to prevent spoilage of the
product which may occur if it is left at room temper-
ature.
2. Turn OFF the thermostat and unplug the cabinet.
3. Defrost completely prior to cleaning.
4. Wash the entire interior storage area with warm
water and baking soda solution — about a table-
spoon of baking soda per quart of water.Rinse thor-
oughly with clean water and wipe dry.
5. A drain hose is provided. Connections are made to
fit a standard garden hose for ease of draining water
from inside of the tank area.
IMPORTANT:
Do not use any objects or cleaners which may leave
residues, odors, or particles. Avoid the use of strong
chemicals or abrasive cleaners which may damage the
interior surfaces and contaminate product within the
storage area.
6. Be sure to correctly plug in to cabinet, set the tem-
perature control, and allow time for cooling of the
storage area before storing product.
DESCRIPTION OF REFRIGERATION
SYSTEM: CONDENSING UNIT
All CMCT cabinets are equipped with Copelametic
compressors utilizing 404A refrigerant:
1/2 HP on the CMCT-4 and CMCT-6
3/4 HP on the CMCT-8
1 HP on the CMCT-10
A back pressure valve is used to protect the compres-
sor against excessive pressures during initial cabinet
start-up and upon termination of the defrost cycle.This
valve is factory pre-set to limit the crankcase pressure
to 10# and should not be changed.
CABINET OPERATION
REFRIGERATION CYCLE:
Refrigeration is accomplished by both a “wrap-around”
tank coil and fin coil. This tank coil consists of several
passes of copper tubing wrapped completely around the
tank or product compartment.The fin coil located behind
the light fixture serves two purposes — it creates a blan-
ket of cold air over the product and collects moisture in
the form of frost from the warm air entering the cabinet,
thus reducing frost collection on the tank coil.The refrig-
erant enters the top of the tank coil first and progresses
downward to the bottom of the tank; from there it enters
the top of the fin coil and again downward. By circuiting
the refrigeration in this manner, it assures the fin coil of
being the coldest part of the system.
DEFROST CYCLE:
Because of the large size and fin arrangement, the
CMCT fin coils have the ability to collect a large amount
of frost before becoming blocked.These features permit
the CMCT cabinets to operate on one defrost cycle per
24 hours, thus reducing product shock to the ice cream.
The fin coil and drain pan are defrosted with one 4-
pass heater located on the underside of the evaporator
assembly.The back pass of the heater lays in the drain
trough which slopes from left to right along the back
edge of the drain pan.
WARNING:
To avoid the possibility of an electrical shock, turn OFF
thermostat and unplug the electrical cord of the cabinet
before cleaning or touching electrical connections or parts.
INTRODUCTION 7

Defrosting is initiated by the time clock and terminated
by a temperature thermostat set to close at 76°F. When
this thermostat closes, it energizes a solenoid in the
time clock which in turn trips the clock mechanism off
defrost. Should this thermostat fail to close, the defrost
cycle will be terminated by the failsafe pin on the time
clock (set at 40 minutes).
As an additional safety feature, the temperature limiting
thermostat is wired in series with the defrost heater.
This thermostat will also open the heater circuit when
the top coil reaches 76°F. should any malfunction of the
defrost thermostat occur.
Any time the system has been opened and
exposed to the atmosphere, a new drier
should be installed, system completely evacuated, and
recharged to the specified refrigerant and amount list-
ed on the serial plate located inside the unit compart-
ment on the left wall.
DO NOT ATTEMPT CHARGING BY
PRESSURES ALONE!! Charge is
very critical! Charging should be accomplished by
means of weighing, or the use of a charging cylinder.
NOTE:
IMPORTANT:
8INTRODUCTION

CMCT ELECTRICAL DATA
CMCT-4 OHMS WATTS AMPS VOLTS
Def. Heater on Bottom side 24.7 582 4.8 120
of Top Coil
Control Bellows Heater below 1600 9 .075 120
Def. Controls
End Breaker Heater behind 960 15 .12 120
each End Breaker
Glass Heater around 262 56 .46 120
Front Glass
CMCT-8 OHMS WATTS AMPS VOLTS
Def. Heater on Bottom side 11.8 1200 10 120
of Top Coil
Control Bellows Heater below 1600 9 .075 120
Def. Controls
End Breaker Heater behind 960 15 .12 120
each End Breaker
Glass Heater around 134 107 .89 120
Front Glass
CMCT-6 OHMS WATTS AMPS VOLTS
Def. Heater on Bottom side 15.9 904 7.5 120
of Top Coil
Control Bellows Heater below 1600 9 .075 120
Def. Controls
End Breaker Heater behind 960 15 .12 120
each End Breaker
Glass Heater around 175 82 .68 120
Front Glass
CMCT-10 OHMS WATTS AMPS VOLTS
Def. Heater on Bottom side 3.38 1561 6.7 230
of Top Coil
Control Bellows Heater below 1600 9 .075 120
Def. Controls
End Breaker Heater behind 960 15 .12 120
each End Breaker
Glass Heater around 190 132 1.1 120
Front Glass
INTRODUCTION 9

10 INTRODUCTION
REFRIGERATION/ELECTRICAL SPECIFICATIONS
CMCT (404A)
CABINET START RUN
MODEL MFG. MODEL HP VOLTS AMPS AMPS
CMCT-4 Copeland KAGB-005E-IAA-222 1/2 115 45 8.0
CMCT-6 Copeland KAGB-005E-IAA-222 1/2 115 45 8.0
CMCT-8 Copeland KAJB-007E-IAA-222 3/4 115 59 12.0
CMCT-10 Copeland KALB-010E-CAV-221 1 230/208 33.5 8.1
REFRIGERATION CYCLE (80° Ambient)
CABINET REFRIG. DEFROST CAP. CONTROL CAVITY
MODEL CYCLE CYCLE REFRIG. OZ. TUBE SUCT. DISCH. SETTING TEMP.
CMCT-4 8.0 - 115V 6.8 - 115V 404A 22 8' x .042 ID 2# 225# No. 7 -22°F
CMCT-6 8.0 - 115V 8.4 - 115V 404A 23 8' x .042 ID 5# 223# No. 7 -19°F
CMCT-8 12.0 - 115V 12.0 - 115V 404A 27 7' x .049 ID 2# 228# No. 7 -22°F
8.1 - 230V 6.7 - 230V
CMCT-10 404A 29 7' x .054 ID 2# 223# No. 7 -27°F
4.8 - 115V 4.8 - 115V
NOTE: Refer to Data plate for refrigerant type and charge.
Condenser Fan ............G.E. 5KSM51GG37845 or Temperature Control ........RANCO A10-4491-00
5KPM51BL-40466 (Reversible Motor)
230 - V.E.M.S. ESP-L35-EM2 Back Pressure Valve ............Sporlan 10# setting
CRO-4-0-20
Time Clock ..............115 Paragon 145-00B (24 Hr.) CRO-6-0-60 (CMCT-10)
230V Paragon 145-20B (24 Hr.)

INTRODUCTION 11
ECMCT REFRIGERATION/ELECTRICAL DATA
Export Models (R-404A)
ECMCT-4 OHMS WATTS AMPS VOLTS
Def. Heater on Bottom side 72.4 582 2.7 215
of Top Coil
Control Bellows Heater below 5375 9 .04 215
Def. Controls
End Breaker Heater behind 3071.4 15 .07 215
each End Breaker
Glass Heater around 826.9 56 .26 215
Front Glass
Heated Glass Lid 41.3 14 .58 24
(each)
ECMCT-6 OHMS WATTS AMPS VOLTS
Def. Heater on Bottom side 51 904 4.2 215
of Top Coil
Control Bellows Heater below 5375 9 .04 215
Def. Controls
End Breaker Heater behind 3071.4 15 .07 215
each End Breaker
Glass Heater around 565.8 82 .38 215
Front Glass
Heated Glass Lid 26.1 22 .92 24
(each)
COMPRESSOR AMPERAGE
CABINET RUN CAP.
MODEL MFG. MODEL HP VOLTS LRA AMPS OZ. TUBE
ECMCT-4 Copeland KAJB-010E-CAV 1 200 40 8.0 20 8' x .042
ECMCT-6 Copeland KAJB-010E-CAV 1 200 40 8.0 25 8' x .042

12 INTRODUCTION
WIRING DIAGRAM – 00-1667-00
CMCT-4, 6, & 8

INTRODUCTION 13
WIRING DIAGRAM – 00-1670-00
CMCT-10

14 INTRODUCTION
WIRING DIAGRAM – 00-1934-00
ECMCT-4, 6, & 8 (Export Models)

INTRODUCTION 15
LAMP WIRING DETAIL –
Upper Raceway (Typical)

SECTION II
Maintenance & Repair

MAINTENANCE & REPAIR 19
CABINET TEMPERATURE CONTROL
Disconnect the power supply before
servicing the cabinet.
Remove the front grill.
The control is located in the machine compartment in
the upper righthand corner, just above the electrical
box. Control settings are numbered from #1 (warmest)
to #7 (coldest) positions.
The control capillary is inserted in a copper bulb well
just to the right of the control. The well is approximate-
ly 20" long and is secured to the cold wall evaporator.
The control reacts to the evaporator temperature which
is approximately -40°F in order to maintain a cavity
temperature of -20°F.
CAUTION: COLD OUT NORMAL OUT NORMAL IN WARM IN
-30°F -23°F -15°F -2°F
TERMINALS: .25 QUICK CONNECT TAB
CAP TUBE LENGTH: 24"
1. Temperature Control
2. 115V Cabinet Power Switch (115V models)
3. 230V Cabinet Power Switch (230V models)
11
11
22
2233
33

ELECTRICAL BOX LAYOUT
Disconnect the power supply before
servicing the cabinet.
The electrical box can be accessed by removing the
front grill.
The electrical box can be pulled out for component
troubleshooting.
The following components are located within the box.
CAUTION:
1. Defrost Timer - 1/24 Hours 5. Main Terminal Board
2. Run Capacitor 6. 115V Power Supply Switch (115V models)
3. Start Capacitor 7. 230V Power Supply Switch (230V models)
4. Potential Relay
11
11
22
22
33
33
44
44
55
5566
66
77
77
20 MAINTENANCE & REPAIR

DEFROST TIMER LAYOUT
After the cabinet is connected to proper voltage supply,
the time clock should be set to the correct time of day
by turning the inner knob counterclockwise until the
correct time is opposite the time indicator on the clock.
The time clock is set to go into defrost once every
24 hours. This defrost occurs at midnight. Under
extreme humidity conditions it might be necessary to
add a second defrost.
MAINTENANCE & REPAIR 21