Master Bilt CGB-50 User manual

6/16 Rev. A 57-02502 1
INSTALLATION & OPERATIONS INSTRUCTIONS
CGB-50, CGB-59, CGB-77
CGD-50, CGD-59, CGD-77
KEEP THIS MANUAL FOR FUTURE REFERENCE
Eng neer ng and techn cal data are subject to change w thout not ce.
Master-B lt Products
908 H ghway 15 North
New Albany, MS 38652
Phone: [phone]

6/16 Rev. A 57-02502 2
CONTENTS
INTRODUCTION ....................................................................................................................................... 3
WARNING LABELS & SAFETY INSTRUCTIONS ............................................................................. 4
PRE-INSTALLATION PROCEDURES .................................................................................................. 5
Inspect on For Sh pp ng Damage ................................................................................................ 5
INSTALLATION INSTRUCTIONS ......................................................................................................... 5
Locat ng The D splay Case ......................................................................................................... 5
Remov ng Case From Sh pp ng Sk d .......................................................................................... 5
Gr ll Removal .............................................................................................................................. 6
Condensate Evaporator ............................................................................................................... 7
Clean ng ...................................................................................................................................... 7
Refr gerat on Installat on ................................................................................................................. 7
ELECTRICAL INFORMATION & GROUNDING ............................................................................... 8
OPERATING INSTRUCTIONS ............................................................................................................... 9
Controls ....................................................................................................................................... 9
Shelves ........................................................................................................................................ 9
Rear Package Shelf ..................................................................................................................... 9
Doors ........................................................................................................................................... 9
Plac ng Product Into Case ......................................................................................................... 10
S ELVING INSTALLATION & REMOVAL ................................................................................. 11-13
Shelves and shelf l ght quant ty ................................................................................................ 13
S ELF INSTALLATION ........................................................................................................................ 13
W re Shelves ............................................................................................................................. 13
Metal Shelves ............................................................................................................................ 13
MAINTENANCE ...................................................................................................................................... 14
Shelf L ght Bulb Replacement .................................................................................................. 14
Top L ght Bulb Replacement .................................................................................................... 14
PERIODIC MAINTENANCE ................................................................................................................. 15
Clean ng Condenser Co l .......................................................................................................... 15
CLEANING INSTRUCTIONS ........................................................................................................... 16-18
Da ly Clean ng .......................................................................................................................... 16
Weekly Clean ng ....................................................................................................................... 17
Inter or Clean ng .................................................................................................................. 17-18
Exter or Clean ng ...................................................................................................................... 18
SERVICE INFORMATION .................................................................................................................... 19
Pre-Serv ce Checkl st ................................................................................................................ 20
Spec al Serv ce S tuat ons ......................................................................................................... 21
SALE & DISPOSAL ................................................................................................................................. 21
Owner Respons b l ty............................................................................................................ 2129
REFRIGERATION & ELECTRICAL DATA ...................................................................................... 22
MAIN WIRING DIAGRAMS ................................................................................................................. 23
LIG T WIRING DIAGRAMS .......................................................................................................... 24-26
REPLACEMENT PARTS ....................................................................................................................... 27

6/16 Rev. A 57-02502 3
INTRODUCTION
Thank you for purchas ng a Master-B lt
®
cab net. Th s manual conta ns mportant nstruct ons for
nstall ng and serv c ng the Master-B lt
®
Curved Glass D splay Cases. A repa r parts l st and w r ng
d agram are also ncluded n the manual. Read all of these documents carefully before nstall ng or
serv c ng your case.
SERIAL NUMBER
Record the model and ser al numbers of the case for easy reference. Always refer to both model and
ser al numbers n your correspondence regard ng the case.
Case Model Ser al Number
Condens ng Un t Model Ser al Number
Th s manual cannot cover every nstallat on, use, or serv ce s tuat on. If you need add t onal
nformat on, call or wr te us:
Technical Service Department
Master-Bilt Products
ighway 15 North
New Albany, MS 38652
Phone: [phone]
Fax: [phone]
Email: [e-mail]
DANGER
Improper or faulty hookup of electrical components in the case can result in severe injury or
death.
All electrical wiring hookups must e done in accordance with all applica le local, regional, or
national standards.
NOTICE
Installation and service of the electrical components in the case must e performed y a
licensed electrician.
The portions of this manual covering components contain technical instructions intended only for
persons qualified to perform electrical work.
NOTICE
Read this manual efore installing your case. Keep this manual and refer to it efore doing any
service on the equipment. Failure to do so could result in personal injury or damage to the
case.

6/16 Rev. A 57-02502 4
CAUTION
ISK OF ELECT IC
SHOCK DISCONNECT
POWE BEFO E
SE VICING UNIT.
91-12340
WARNING LABELS & SAFETY
INSTRUCTIONS
Th s s the safety-alert symbol. When you see th s symbol on your case or n the
manual, be alert to the potent al for personal njury or damage to your equ pment.
Be sure you understand all safety messages and always follow recommended precaut ons and safe
operat ng procedures.
Important safety nformat on s presented n th s sect on and throughout the manual. The
Follow ng s gnal words are used n the warn ng and safety messages:
DANGER: Severe injury or death will occur if you ignore the message.
WARNING: Severe injury or death can occur if you ignore the message.
CAUTION: Minor injury or damage to your case can occur if you ignore the message.
NOTICE: This is important installation, operation, or service information. If you ignore the
message, you may damage your case.
The warn ng and safety labels shown throughout th s manual are placed on your Master-B lt
®
case at the factory. Follow all warn ng label nstruct ons. If any warn ng or safety labels become lost or
damaged, call our customer serv ce department at [phone] for replacements.
This label is located on the back of the display case. This label is located below the display pan.
NOTICE TO EMPLOYERS
You must make sure that everyone who installs, uses, or services your case is
thoroughly familiar with all safety information and procedures.
CAUTION
HAZARDOUS MOVING PARTS
DO NOT OPERATE UNIT WITH
DISPLAY PANS REMOVED.

6/16 Rev. A 57-02502 5
PRE-INSTALLATION PROCEDURES
Inspection for Shipping Damage
You are respons ble for f l ng all fre ght cla ms w th the del ver ng truck l ne. Inspect all cartons
and crates for damage as soon as they arr ve. If damage s noted to sh pp ng crates, cartons, or f
a shortage s found, note th s on the b ll of lad ng (all cop es) pr or to s gn ng.
If damage s d scovered when the case s uncrated, mmed ately call the del ver ng truck l ne and
follow up the call w th a wr tten report nd cat ng concealed damage to your sh pment. Ask for
an mmed ate nspect on of your concealed damage tem. Crat ng mater al must be reta ned to
show the nspector from the truck l ne.
INSTALLATION INSTRUCTIONS
Locating the Display Case
The case should be located where t s not subjected to the d rect rays of the sun, heat ng ducts,
gr lls, rad ator, or ce l ng fans, nor should t be located near open doors or ma n door entrances.
Also, avo d locat ons where there are excess ve a r movement or a r d sturbances.
The condenser a r nlet and d scharge s located at the rear of the case. Do not block th s nlet
and do not locate the a r nlet near a source of heat.
Removing Case From Shipping Skid
1. Remove crate top and s des and note m ss ng or damaged tems as expla ned n the pre- nstallat on
procedures outl ned above.
2. Move the case as near as poss ble to the f nal locat on and before remov ng t from the sh pp ng sk d.
3. If your case s suppl ed w th plast c end panels, remove them by l ft ng them n an upward d rect on.
Set these end panels as de to be re nstalled after case s placed n proper pos t on.
4. Remove the (4) brackets that secure the case to the sh pp ng sk d.
5. L ft case off of sk d and nto requ red pos t on.
CAUTION: Do not push against the top glass, front glass, end glass, doors or
door frames when removing the case from the skid or moving the case. Case
damage or glass breakage could result.

6/16 Rev. A 57-02502 6
6. Level and square the case as needed by adjust ng the leg leveler n each corner of base. (Use the
wrench prov ded.) (The case must be level for proper dra nage of defrost condensate to the
condensate evaporator and allow for proper al gnment of front glass.) The 59”, & 77” cases also
have a set of leg levelers n the center. These must be adjusted so the base s flat.
7. The leveled case must be sealed to the floor us ng a NSF L sted Sealant.
Grill Removal (Refrigerated Units)
There s a removable slotted panel at the rear of the case. The panel allows access to the
condens ng un t, the l ght ballast, the condensate pan, and the f eld w r ng connect on box.
Remove th s panel to make f eld w r ng connect ons. See electr cal nformat on and ground ng
sect on of th s manual before w r ng case.
Note: If electr cal connect on has been performed, d sconnect power to case before remov ng gr ll panel.
1. Remove the rear gr ll panel screws from top of rear gr ll.
2. T lt the top of rear gr ll panel outward as shown n llustrat on on the r ght.
3. Pull rear gr ll panel tabs up and out of slots n base of case.
2.
1. REAR GRILL
PANEL SCREWS
3. REAR GRILL
PANEL TABS
E1954-7
DANGER: Electric shock hazard. Do not operate unit with panels removed.

6/16 Rev. A 57-02502 7
Condensate Evaporator
Th s case s furn shed w th an electr cal condensate evaporator. Plumb ng connect ons are not
requ red.
The condensate evaporator s located toward the front of the mach ne compartment and s
access ble from the rear of the case. After removal of rear gr ll panel, make sure that the dra n
l ne has not been d slodged dur ng sh pment and that the dra n trap s located properly over the
water reservo r of the condensate evaporator pan.
Cleaning
For n t al setup, clean the case as outl ned n the weekly clean ng sect on of th s manual.
Refrigeration Installation
Self Contained Models
The self-conta ned models are sh pped from the factory w th a completely operat onal 134A
refr gerat on system and requ re no mod f cat ons or adjustments upon nstallat on.

6/16 Rev. A 57-02502 8
ELECTRICAL INFORMATION &
GROUNDING
This Case Must Be Grou ded
Only a l censed electr c an must perform all case electr cal connect ons.
All electr cal w r ng hookups must be done n accordance w th all appl cable local, reg onal, or nat onal
electr cal standards.
A separate c rcu t for each d splay case s recommended to prevent other appl ances on the same c rcu t
from overload ng the c rcu t and caus ng malfunct on.
The electr cal serv ce must be grounded upon nstallat on.
Th s un t s des gned for permanent connect on to a power source. See the electr cal data plate located at
the rear of the case for proper c rcu t s ze and w re ampac ty.
The electr cal connect on box s access ble from the rear of the case. Remove rear gr ll on refr gerated
models. (See “Gr ll Removal” n the nstallat on sect on of th s manual.) See d agram below for
locat on of the f eld w r ng connect on box.
BAC OF CASE OVERHANGS
BASE 1".
7/8" DIA. ELECTRICAL ENTRANCE
ON REAR OF CASE,
1" FROM SIDE OF BASE
1-3/4" FROM BOTTOM OF BASE
7/8" DIA. ELECTRICAL ENTRANCE
IN BOTTOM OF CASE,
2-3/4" FROM SIDE OF BASE,
2-1/8" FROM REAR OF BASE.
FIELD CONNECTION COVER
FOR REFRIGERATED CASES
E3233-1
DANGER: Improper or faulty hookup of electrical components in the
display case can result in severe injury or death.

6/16 Rev. A 57-02502 9
OPERATING INSTRUCTIONS
LIGHT SWITCH
TEMPERATURE CONTROL
E1954-8
Controls
Light Switch
Th s sw tch controls the power to the l ght ng c rcu t. The sw tch rocker s red n the “on”
pos t on, black n the “off” pos t on.
Temperature Control
Th s controls the refr gerated s de by cycl ng the compressor/condens ng un t. It has an “off”
pos t on and the coldest sett ng when the knob s set all the way n the clockw se pos t on. Set
th s control at the lowest sett ng poss ble, wh le ma nta n ng des red case temperature.
Shelves
Each d splay s furn shed w th shelves that are adjustable up and down and can be t lted n three
angular pos t ons. See “Shelv ng Installat on & Removal” sect on of th s manual for proper
nstallat on, adjustment and removal of shelv ng.
Sliding Rear Doors
The doors can be eas ly removed by l ft ng doors upward unt l the bottom edge of door clears the
lower track. Sw ng the bottom of door outward and down out of top track.
Clean the door track frequently for easy door operat on. A Very l ght f lm of lubr cant, such as
PAM, w ll help the doors sl de eas ly.

6/16 Rev. A 57-02502 10
Placing Product into Case
After complet ng shelv ng nstallat on as outl ned n “Shelv ng Installat on and Removal” sect on
of th s manual you may beg n plac ng product nto the d splay case.
- Do not exceed 150 pounds of we ght per shelf. Heavy product should be d str buted evenly
across the ent re shelv ng area.
- Determ ne des red shelv ng locat on and angle before plac ng product n case. Product must be
removed to readjust shelf locat on and angle.
- Do not overhang the front of w re shelves w th product. Product may overhang rear of shelf,
but allow a m n mum of 1-1/2” between product and rear door. Improper clearance n front and
rear of shelf w ll block the refr gerated a rflow and could cause product loss.
-Do not block the slots along the front or rear of the case d splay pan. Cover ng these slots w ll
block the refr gerated a rflow and could cause product loss.
-The d splay pan s removable for clean ng and can become d slodged n sh pment. To ensure
proper a rflow and performance of the case, make sure that the d splay pan s pushed completely
down nto evaporat on tub. Check that the pan s nstalled properly before plac ng product the
d splay pans.
-Allow refr gerated models to run for at least two hours before plac ng pre ch lled product nto
un t. Turn temperature control to the lowest poss ble pos t on that ma nta ns requ red nter or
cab net temperature.
-CASE S OULD BE STOCKED WIT PRE-C ILLED PRODUCT
ONLY.
ATTENTION:
- Refrigerated display cases are designed to operate in a maximum
environment of 75 DEG. F and 55% relative humidity. Exceeding these
limits could cause poor case performance and sweating of glass
panels.

6/16 Rev. A 57-02502 11
SHELVING INSTALLATION & REMOVAL
METAL SHELF
FEMALE SHELF
LIGHT SOC ET
WIRE SHELF
WIRE RETAINER
CLEAR PLASTIC
CLIP
SHELF BRAC ET
SHELF LIGHT
SHELF SUPPORT
SHELF RETAINER SHELF BRAC ET
CLEAR PLASTIC CLIP
WIRE SHELF ONLY
1. Turn the l ght sw tch to the off pos t on, on un ts w th sl d ng rear doors, remove both rear doors
from track by l ft ng doors upward unt l the bottom edge of door clears the lower track. Sw ng the
bottom of door outward and down out of top track.
2. Insert a shelf bracket n the des red shelf standard slot on one s de of case. The short set of shelf
brackets are for the top shelf and the longer shelf brackets are for the m ddle and bottom shelves.
Follow the nstruct on n the llustrat on below. Place an add t onal shelf bracket n the same shelf
standard slot on the oppos te end of case. Repeat for add t onal shelf t ers.

6/16 Rev. A 57-02502 12
INSTALLATION REMOVAL
SHELF STANDARD
TOP HOO
1
SHELF BRAC ET
2
3
BOTTOM TAB
4
12° NOTCH
6° NOTCH
0° NOTCH
A.. Place shelf bracket top hook into desired shelf
standard slot.
B. Lift shelf bracket top hook to allow shelf bracket
bottom tab to clear shelf standard slot.
C. Swing shelf bracketbottom tab into shelf standard
slot.
D. Place the desired shelf bracket notch of 0, 6, or 12
degrees onto bottom of shelf standard slot.
A. Lift shelf bracket up to allow shelf bracket notch
to clear the bottom of shelf standard slot.
B. Swing shelf bracket bottom tab out of shelf
standard slot.
C. Drop shelf bracket down to allow shelf bracket top
hook to clear top of shelf standard slot.
D. remove shelf bracket top from shelf standard slot.
3. Hang one end of shelf l ght hous ng on the front notch of a shelf bracket and then the other end of
shelf l ght hous ng on the notch of the shelf bracket on the oppos te end. Repeat for each add t onal
shelf t ers
4. Push shelf l ght cords nto clear plast c cl p located on ns de of shelf brackets.
5. Remove the cap from the appropr ate female l ght sockets. If socket s not be ng used for a shelf
l ght, the cap must be plugged nto socket for ent re l ght system to operate. NOTE: Gr p each s de
of cap f rmly and w ggle and pull cap stra ght out of socket. Do not roll cap dur ng removal.
IGHT W ONG
6. Plug n each shelf l ght by al gn ng the male p ns on the appropr ate shelf l ght cord plugs w th the
female l ght sockets and push together. NOTE: Do not roll plug dur ng nsert on.
1
2
3
4
E1954
-
3

6/16 Rev. A 57-02502 13
7. Hang one end of the shelf support on to the rear notch of one shelf bracket and then on the rear notch
of the shelf bracket on the oppos te s de. Repeat for add t onal shelf t ers.
8. Place suppl ed shelv ng onto shelf supports as outl ned n the appropr ate “Shelf Installat on” sect on
of th s manual.
9. On un ts w th sl d ng rear doors, re- nstall both rear doors by l ft ng top of door nto top track and
sw ng ng bottom of door onto bottom track. Install door labeled “ nner door” f rst on nner track and
door labeled “outer door” second on outer track.
Shelves and shelf light quantity
It s not requ red that all shelves and shelf l ghts suppl ed w th each case are used. The quant ty of
shelves and shelf l ghts can be ta lored to your spec f c needs. If the suppl ed quant ty of shelves and
shelf l ghts are not requ red, cap unused female socket located n nter or of the case mull on w th caps
suppl ed. Fa lure to do so w ll prevent ent re l ght ng system from operat ng.
SHELF INSTALLATION
Wire Shelves
1. The CGB models are prov ded w th 22” w re shelves for the bottom and m ddle shelf and the 16”
w re shelf s for the top shelf.
2. W th rear sl d ng doors removed place front of w re shelf onto front shelf l ght and snap the front of
shelf nto the clear plast c cl ps on front l ght hous ng.
3. Snap the rear of shelf nto the clear plast c cl ps on rear shelf support.
4. Repeat 2 & 3 for each t er.
NOTE: Un ts w th 73” long rear shelf supports uses (2) w re shelves per t er. All other un ts use (1)
w re shelf per t er.
Metal Shelves
1. The CGD models are prov ded w th a s ngle metal shelf.
2. W th rear sl d ng door removed, or rear sw ng door open, place front of metal shelf on to front shelf
l ght.
3. Set the rear of the metal shelf on to the rear shelf support so that the notch at each end of metal shelf
straddles the rear shelf support. If clear plast c cl ps were factory- nstalled on top of rear shelf
support or front shelf l ght, remove and d scard clear plast c cl ps.
4. Repeat steps 2 & 3 for each t er f suppl ed w th more than (1) t er of shelv ng.

6/16 Rev. A 57-02502 14
MAINTENANCE
Shelf Light Bulb Replacement
1. All shelf l ght f xtures use a spr ng-loaded socket at one end. To remove the bulb push the bulb
towards the spr ng-loaded socket unt l the oppos te ends drops out of the socket.
2. The bulb s ns de a clear shatter proof tube w th a black plast c cap on each end. Be careful not
to allow bulb to sl de out of shatter proof tube.
3. Re nstall new bulb n to the ex st ng shatter proof tube and reuse black plast c end caps. Re nstall
bulb assembly n the same manner as descr bed n the Bulb Removal Procedure. Be sure bulb s
secure n bulb receptacles
Note: Be sure to use a direct equivalent to the original bulb.
Top Light Bulb Replacement
1. On un ts w th sl d ng rear doors, remove both rear doors from track by l ft ng doors upward unt l the
bottom edge of door clears the lower track. Sw ng the bottom of door outward and down out of top
track. On un ts w th rear sw ng doors completely open doors to allow access to nter or of case.
2. Remove all shelves, shelf supports and Shelf l ghts from un t through rear door open ng. (See
“Shelv ng Installat on and Removal” sect on of th s manual for nstruct on f needed)
3. Remove top l ght lens cl p screw(s), lens cl p(s), and top l ght lens as llustrated below.
4. To remove bulb from top l ght hous ng, gr p the bulb receptacle end caps at each end of bulb. Pull
the bulb receptacle end caps stra ght outward toward front of case. Once bulb and bulb receptacle
end caps are removed from top l ght hous ng remove the bulb receptacle end caps from end of bulb.
(Note: 50”dual zone models do not have end caps.)
5. Re nstall new bulb n the same manner as descr bed n the Bulb Removal Procedure. Be sure bulb s
secure n bulb receptacles. Note: Be sure to use a direct equivalent to the original bulb.
6. Re nstall top l ght lens, lens cl ps, and lens cl p screws n reverse order as shown n llustrat on
below.
TOP LIGHT LENS
2
1
LENS CLIP SC EW(S)
LENS CLIP(S)
4
BULB END CAPS 3
E1954-4
TOP LIGHT LENS
BULB END CAPS

6/16 Rev. A 57-02502 15
PERIODIC MAINTENANCE
Cleaning Condenser Coil
1. D sconnect power to the un t.
2. Remove the back base panel located on the back bottom of un t by remov ng the panel reta n ng
screws.
3. Carefully vacuum the front surface of condenser co l. Take care not to bend co l f ns w th
vacuum cleaner nozzle.
4. Re nstall back panel and reta n ng screws.
VACCUM
CONDENSE
COIL FINS
AI INTAKE
EA PANEL
It s very mportant that the Condenser co l s cleaned tw ce per month to nsure proper
refr gerat on performance and to prevent compressor fa lure. Fa lure to clean condenser
co l w ll vo d condenser warranty.

6/16 Rev. A 57-02502 16
CLEANING INSTRUCTIONS
Daily Cleaning
The case should be cleaned thoroughly, as descr bed n the weekly clean ng sect on, before t s
used for the f rst t me.
Note: For major sp lls or fore gn mater al bu ldup use complete weekly clean ng nstruct ons.
1. Clean all fore gn mater als from the door open ng.
2. W pe complete nter or of case us ng a damp cloth.
3. T lt the front glass forward as descr bed n the llustrat ons below. Th s w ll allow eas er
access to clean nter or front and s de glass. The glass can then be cleaned w th common
w ndow cleaners.
OPE N FR ON T GLA SS :
1. Stand in front of unit and grab the pull
handle with both hands.
2. Pull front glass outward until the glass
rests on front glass stops.
CLO S E FRON T GL ASS :
1. Stand in front of unit and push on front
of pull handle with both hands.
2. Firmly push glass towards rear of unit
until front glass rests in closed position
4. The rema n ng exter or surface should be w ped down us ng any soapy warm water.
Note: Do not use detergents or chlor ne and do not use abras ve cleaners or pads to prevent
scratch ng of surfaces.
NOTICE:
Remove all product from case before proceeding with cleaning
procedure.
NOTICE:
Shut off lights and power switches and remove all product from case.
Allow sufficient time for the unit to reach room temperature before
proceeding with cleaning.
NOTICE:
Avoid splashing or soaking any electrical components with water to
prevent electrical damage to the case.

6/16 Rev. A 57-02502 17
Weekly Cleaning
Th s procedure s recommended on a weekly bas s. It may need to be performed more often f
necessary to ma nta n a clean, san tary case. The case should be cleaned to th s procedure before
us ng the f rst t me.
Interior Cleaning
EF IGE ATED
MODELS ONLY
EA DOO
INNE
SHELVING
EA DOO
OUTE
E1954-9
FAN SH OUD
MOUNTING TABS
EVAP. FAN
DISPLAY PAN
EVAP FAN SH OUD
SHELF
LIGHT
SHELF
SUPPO T
SHELF B ACKET
SHELF STANDA D
NOT
ICE:
Avoid splashing or soaking any electrical components with water to
prevent electrical damage to the case.
NOTICE:
Shut off light and power switches and remove all product from case. Allow
sufficient time for the unit to reach room temperature efore proceeding
with cleaning.

6/16 Rev. A 57-02502 18
1. Remove all nter or shelv ng as descr bed n the shelv ng nstallat on and removal sect on of th s
manual.
2. Remove both shelf standards from nter or of case. F rst remove thumbscrew at bottom of shelf
standard and then sl de shelf standard up to allow top key slot to clear.
3. L ft the d splay pan up and out of evaporator tub. Remove d splay pan through rear open ng.
4. Remove the evaporator fan shroud. F rst remove the thumbscrews along the backs de of
evaporator fan shroud. L ft the rear of the evaporator fan shroud allow ng the front to h nge on
fan shroud mount ng tabs. Reach n and unplug the evaporator fan motor cord. Cont nue to l ft
the evaporator fan shroud wh le at the same t me pull ng t to the door open ng of case unt l the
slots n the evaporator fan shroud can clear the fan shroud mount ng tabs. Remove evaporator
fan shroud through rear open ng.
5. Clean the ent re nter or of the case us ng warm soapy water. W pe off all soapy water w th a
damp cloth and allow todry.
NOTE: Depend ng on the amount of usage and sp llage of fore gn mater al, some fasteners may have to
be removed and parts d sassembled to allow proper clean ng of the un t.
6. Clean all shelves, shelf support bars, shelf l ght hous ngs, shelf l ght hous ngs, shelf brackets,
and d splay pans us ng warm soapy water and a brush. R nse thoroughly and allow to dry.
7. Clean all fore gn mater al from nner and outer rear door tracks us ng warm soapy water and a
brush. Apply a l ght f lm of lubr cant such as PAM to make the doors operate smoother.
8. Clean both s des of the doors and nter or of the front glass us ng any common w ndow cleaner.
NOTE: Front glass can be t lted forward to s mpl fy front glass clean ng. See “Da ly Clean ng” sect on
for glass t lt ng operat on.
9. Reassemble the case n reverse order start ng w th Step 6.
Exterior Cleaning
1. Clean the front glass us ng any common w ndow cleaner.
2. The exter or surfaces should be w ped down us ng any ammon ated cleansers or warm soapy
water.
NOTE: For major sp lls or fore gn mater al bu ld-up use complete weekly clean ng nstruct on.

6/16 Rev. A 57-02502 19
SERVICE INFORMATION
Before any serv ce work s
performed on the case, make sure all
power s d sconnected to the case.
Serv ce problems or request for repa r parts from author zed serv ce agenc es, tra ned serv ce personnel,
or owners should be referred to:
Pre-Service Checklist
You may avo d the cost and nconven ence of an unnecessary serv ce call by f rst rev ew ng th s
checkl st of frequently encountered s tuat ons that can cause unsat sfactory case performance.
Technical Service Department
Master-Bilt Products
ighway 15 North
New Albany, MS 38652
Phone: [phone]
Fax: [phone]
Email: [e-mail]
CAUTION
RISK OF ELECTRIC
SHOCK
DISCONNECT POWER
BEFORE SERVICING UNIT
CAUTION:
Before servicing case turn off power at the main reaker of
fuse ox.

6/16 Rev. A 57-02502 20
Pre-Service Checklist
Case Does Not Operate
Check for d sconnected power supply.
Check for tr pped breaker or blown fuse.
Check that the thermostat s not “off”.
Lights Do Not Operate
Check that l ght sw tch s on.
Be sure l ght s properly seated n the sockets.
Check that l ght cord(s) are t ght n the sockets.
Plug unused l ght sockets w th socket cap prov ded w th socket.
Case Temperature Too Warm
Check that the cold a r nlet and outlet slots are not blocked.
Be sure that the rear doors are closed and t ghtly sealed.
Check for a blocked or d rty condenser co l f lter or condenser co l f ns.
Check cold a rflow. Lack of adequate cold a rflow could be a defect ve evaporator fan or
blocked evaporator co l. Check that paper or fore gn mater al s not block ng evaporator.
If the evaporator co l s blocked due to excess ve frost, turn the thermostat knob to the
“off” pos t on for approx mately one hour to defrost. Excess ve frost w ll bu ldup f the
case s operated w th the door open or ajar.
Check that the d splay pans are nstalled properly.
Glass Fogging
Check room amb ent – Case s des gned to operate n an env ronment not to exceed 75°F
and 55% relat ve hum d ty.
Check case temperature – Case s des gned to operate between 38°F and 42°F.
Check that noth ng s placed on the top of the case glass.