Master Bilt IHC-27 User manual

6/17Rev. E 57-02410
Installation & Operations Manual
Master-Bilt Products
908 Highway 15 orth
ew Albany, MS 38652
Phone: [phone]

6/17 Rev. E 57-02410 2

6/17 Rev. E 57-02410 3
TABLE OF CO TE TS
I TRODUCTIO ....4
STORE CO DITIO S......4
WAR I G LABELS A D SAFETY I STRUCTIO S........5
PRE-I STALLATIO I STRUCTIO S..........................6
Inspection for Shipping Da age!!!!!!!!!!!!!!!!!!!!!!......!!!!!.!!!....6
I STALLATIO I STRUCTIO S...6
General Instructions!!!!!!!!!!!!!!!!!!!!!!!!!!!!!..!!!.!!!!!..6
Mechanical ..!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!..!!!!.!!!..7
Electrical!!!!...!!!!!!!!!!!!!!!!!!!!!!!!!!!.!!!..!!!!!!!..7
Leg and Condensate Pan Installation..!!!!!!!!!!!!!!!!!!!!!!!..!!!!!.!..8
SERVICE I STRUCTIO S .......8
TEMPERATURE SE SOR, DEFROST HEATER A D FA MOTOR REPLACEME T.....9
ELECTRO IC REFRIGERATIO CO TROL.....10-11
SE SOR TEMPERATURE A D RESISTA CE....12
FI AL CHECK LIST....12
ACCESSORIES....12
PART UMBERS .....13
SALE A D DISPOSAL.......13
WIRI G DIAGRAM.......14-16

6/17 Rev. E 57-02410 4
I TRODUCTIO
Thank you for purchasing a Master-Bilt
®
cabinet. This anual contains i portant instructions for installing, using,
and servicing a Master-Bilt
®
IHC case. A parts list is included with this anual. Read all these docu ents carefully
before installing or servicing your equip ent.
STORE CO DITIO S
The Master-Bilt
®
IHCcases are designed to operate in the controlled environ ent of an air-conditioned store. The
store te perature should be at or below 75°F and a relative hu idity of 55% or less. At higher te perature or
hu idity conditions, the perfor ance of these cases ay be affected and the capacity di inished.
The Master-Bilt
®
IHC should not be positioned where it is directly exposed to rays of sun or near a direct source of
radiant heat or airflow. This will adversely affect the case and will result in poor perfor ance.
If this case is to be located against a wall, there should be at least 4” space between the wall and the back of the
case. This space will allow for the circulation of air behind the case, which will prevent condensation on the exterior
surfaces.
OTICE
Read this manual before installing your cabinet. Keep the manual and refer to it before
doing any service on the equipment. Failure to do so could result in personal injury or damage to the
cabinet.
DA GER
Improper or faulty hook-up of electrical components on the refrigeration units can result in severe injury or
death.
NEVER use an extension cord to power these units. All electrical wiring hook-ups must be done in
accordance with all applicable local, regional or national standards.
OTICE
Installation and service of the refrigeration and electrical components of the cabinet must be performed by
a refrigeration mechanic and/or a licensed electrician.
The portions of this anual covering refrigeration and electrical co ponents contain technical instructions intended
only for persons qualified to perfor refrigeration and electrical work.
This anual cannot cover every installation, use or service situation. If you need additional infor ation, call or write
us:
Custo er Service Depart ent
Master-Bilt Products
Highway 15 North
New Albany, MS 38652
Phone [phone]
Fax [phone]

6/17 Rev. E 57-02410 5
CAUTION!
GROUND REQUIRED
FOR SAFE OPERATION
WAR I G LABELS A D SAFETY I STRUCTIO S
This sy bol is the safety-alert sy bol. When you see this sy bol on your cabinet or in this
anual, be alert to the potential for personal injury or da age to your equip ent.
Be sure you understand all safety essages and always follow reco ended precautions and safe operating
practices.
OTICE TO EMPLOYERS
You must make sure that everyone who installs, uses or services your cabinet is thoroughly familiar with all
safety information and procedures.
I portant safety infor ation is presented in this section and throughout the anual. The following signal words are
used in the warnings and safety essages:
DA GER: Severe injury or death will occur if you ignore the essage.
WAR I G: Severe injury or death can occur if you ignore the essage.
CAUTIO : Minor injury or da age to your cabinet can occur if you ignore the essage.
OTICE: This is i portant installation, operation or service infor ation. If you ignore the
essage, you ay da age your cabinet.
The warning and safety labels shown throughout this manual are placed on your Master-Bilt Products
cabinet at the factory. Follow all warning label instructions. If any warning or safety labels become lost or
damaged, call your customer service department at [phone] for replacements.
This label is located on top of the electrical control
This label is attached to the cabinet power cord on models with a power cord.
label and on the wiring channel.

6/17 Rev. E 57-02410 6
PRE-I STALLATIO I STRUCTIO S
I SPECTIO FOR SHIPPI G DAMAGE
You are responsible for filing all freight clai s with the delivering truck line. Inspect all cartons and crates for
da age as soon as they arrive. If da age is noted to shipping crates or cartons or if a shortage is found, note this
on the bill of lading (all copies) prior to signing.
If da age is discovered when the cabinet is uncrated, i ediately call the delivering truck line and follow up the call
with a written report indicating concealed da age to your ship ent. Ask for an i ediate inspection of your
concealed da age ite . Crating aterial ust be retained to show the inspector fro the truck line.
I STALLATIO I STRUCTIO S
GE ERAL I STRUCTIO S
1. Be sure the equip ent is properly installed by co petent service people.
2. Keep the equip ent clean and sanitary so it will eet your local sanitation codes. Clean the cabinet with a ild
detergent and water, then rinse.
3. Rotate your stock so that older stock does not accu ulate. This is especially i portant for ice
crea . A "First-In, First-Out" rotation practice will keep the products in good salable condition.
4. Do not place product in the case when it is soft or partially thawed. Also, product should not be put in the case for
at least 6 hours after it is started.
5. Stock cases as quickly as possible, exposing only s all quantities to store te peratures for short periods of ti e.
6. When replacing burned out fluorescent tubes, be sure that the electrical power to the lighting circuit is turned off.
OTICE TO STORE OW ERS / MA AGERS
Moisture or liquid around or under the cabinet is a potential slip/fall hazard for persons walking by or
working in the general area of the cabinet. Any cabinet malfunction or housekeeping problem that creates a
slip/fall hazard around or under the cabinet should be corrected immediately.
If oisture or liquid is observed around or under a Master-Bilt
®
cabinet, an i ediate investigation should be ade
by qualified personnel to deter ine the source of the oisture or liquid. The investigation should deter ine if the
cabinet is alfunctioning or if there is a drainpipe leaking.

6/17 Rev. E 57-02410 7
MECHA ICAL
Re ove front grille and check refrigeration lines to see that they are free (not touching each other or co pressor).
Spin condenser fan blade to see that it is free.
Check that all service valves (3) are open. Re ove wooden shipping blocks under co pressor. Check all
refrigeration lines and electrical conduit for rubbing or chaffing, paying particular attention to area where lines enter
the cabinet. Make sure the co pressor switch is on before start up the cabinet.
After removering the wooden blocks, the compressor
should move freely on its mounting springs.
Re ove cabinet fro crate base and slide into location. Cabinet ust be level fro side to side and front to back for
correct draining of coil pan and for self-closing doors to operate correctly. Allow ini u of 4” between back of
cabinet and wall and between top of cabinet and ceiling for proper condensing unit air circulation.
To co ply with Sanitation require ents the cabinet ust be ounted on legs (6” high in.) or casters or the base
ust be sealed to the floor with an N.S.F. listed silicone sealant.
To co ply with UL require ents the cabinet ust have a ini u clearance of 4” at the top, 6” at the rear and 0” at
each side.
ELECTRICAL
WAR I G
Before servicing electrical components in the case or the doors or door frames make sure all power to case
is ff. Always use a qualified technician.
Check voltage and a ps drawn on (Page 17) to deter ine proper line and fuse or circuit breaker size. Check power
supply for low voltage. If voltage reads “230” with no load, and it drops below “207” when the co pressor tries to
start, it is an indication of too s all supply wiring or too long to run.
It is reco ended that a separate circuit be run for each cabinet to prevent another appliance blowing the fuse or
breaker, causing loss of product.
* *The cabinet should be grounded.**

6/17 Rev. E 57-02410 8
LOW TEMPERATURE FREEZERS – “IHC” Models
The IHC has a power cord (15A, 230 Volt) on top of the cabinet at the right rear for connection to power. On initial
start-up the evaporator fan otors will not start and you cannot initiate a defrost until the evaporator coil te perature
has lowered to 25°F. This is due to the ther ostat. Also, the cabinet co es with a non-adjustable “Front” control to
keep the ullion heaters off until the cabinet te perature has lowered to 10°F.
EG AND CONDENSATE PAN INSTA ATION FOR TOP MOUNT CABINETS ON Y
1. Screw legs into existing crate ounting holes.
Condensate Heater Pan (IF PROVIDED)
Mount pan and bracket asse bly to rear of cabinet with
2 large sheet etal screws (supplied). Be sure pan is
located directly under cabinet drain.
Condensate Pan Assembly (OPTIO AL)
1. Place the condensate drain pan (evapoway pan) level behind
or slide under the IHC cabinet.
2. Route the drain line of the cabinet to the pan so the water
can drip into the pan during defrost.
* Do not let the drain tube touch the drain pan’s heater. It
can melt the tube or even catch it on fire.
3. Plug the drain pan into a separate 115V power supply.
SERVICE I STRUCTIO S
1. High head pressure and high back pressure:
A. Condenser coil clogged or restricted
B. Condenser fan otor defective.
C. Air discharge in rear of cabinet
restricted.
2. Low back pressure and low head pressure:
A. Restriction in syste .
B. Refrigerant undercharged.
C. Leak in syste
3. Pressure nor al – cabinet war :
A. Coil blocked with frost (see #4).
B. Refrigerant undercharged.
C. Control set too war .
4. Cabinet not cycling – coil blocked with frost:
A. Defective te perature controller.
B. Refrigerant overcharged.
C. Location too hot.
D. Condenser clogged.
E. Condenser fan otor defective.
F. Defrost heater not operating.
5. Co pressor starts and runs – but cycles on
overload:
A. Low voltage
B. Relay defective.
C. Overload defective.
D. High head pressure (see #

6/17 Rev. E 57-02410 9
Temperature sensor, defrost heater and fan motor replacement
Before aking any change, technician should:
1. Disconnect power to the cabinet
2. Re ove screws fro venturi and pull down
To change a te perature sensor (cabinet zone sensor or defrost ter ination sensor), si ply disconnect
the sensor wires fro the controller and replace the new sensor in the original position. Use plastic tie to
tighten the zone sensor. Insert the sensor for defrost ter ination fir ly into the evaporator coil, in
between the fins. Make sure the sensor wires do not touch or are not close to any heater rods.
To change defrost heater – re ove screws fro drain pan and pull down – re ove screws fro coil
ounting straps – spring straps open – re ove heater shield – pull heater out of slots in coil fins.
To change fan otor – disconnect fan otor leads and screws that attach otor to bracket
ROOM TEMP. SENSOR
FAN DELAY/DEFROST
TERMINATION
SENSOR
MOTOR
MOTOR DEFROST
HEATER
HEATER SHIELD
VENTURI
EVAP. COIL

6/17 Rev. E 57-02410 10
MASTER-BILT
®
ELECTRO IC REFRIGERATIO CO TROL
Display Lay-out
Compressor When power is first turned on to the control, the controller will go through the start-up delay. After
one- inute delay the co pressor co es on. The LED for cooling indicator stays on while co pressor relay is
energized. Display will show actual box te perature. Picture above is the display layout. The co pressor will be
cycled off when the actual box te perature reaches its set point. The cooling indicator will be off.
Fan The fans will run constantly except when a defrost is initiated, or when the evaporator te p is above the 30
o
F.
When in defrost ode the fan is off until the end of the defrost and the 2 inute drip ti e has passed. There is 2
inutes delay after a defrost before the fan co es on. If the Evaporator te perature is 35
o
F or below the controller
will override the fan delay. FAN indicator is on while FAN relay is energized.
Defrost The control uses ti e defrost with 2 defrost per day. The defrost sche e can be re-set the for special
applications. During defrost the display will show dEF when the defrost indicator on. The control begins ti ing the
defrost when power is turned on. The para eters of the controller is arranged in hours under the setting DFT. For
an exa ple, if four defrost per day is desired, the value should be set to “4”. Or to have defrost to occur at a
specific ti e such as 8 a and to have “6” defrost per day, power up at 8a , 2p , 8p , or 2a and set DFT to
“6”.
MA UAL DEFROST
Defrosting ay also be induced anually by keeping the defrost button for 3 seconds. Once defrost has started, the
cabinet will go through a defrost and drip ti e pull down cycle.

6/17 Rev. E 57-02410 11
HOW TO CHA GE THE SETPOI T
HOW TO CHA GE a parameter value
OTE 1: The set value is stored even when the procedure is exited by waiting the ti e-out to expire.
OTE 2: Master-Bilt
®
SETPOINT is set at a reco ended –25°F at the factory.
OTE 3: To scroll down the para eters without changing the , press the DOWN button.
LIST OF PARAMETERS
Here is a list of the para eters the value of which can be changed in the progra ing ode, as well as their
ranges.
Display
Symbol Parameter Range
Master-Bilt
®
Setting
SP Te perature Set Point SPL!SPH -25°F
HYS Te perature Differential 1 to 255°F 7°F
SPL Mini u Te perature li it setpoint -50!SPH -37°F
SPH Maxi u Te perature li it setpoint SPH!120° 32°F
AHA High Te perature alar -50!120° 30°F
ALA Low Te perature Alar 50!120° -45F
ATD Te perature Alar Delay 0!120 in 30 in
DFT Nu ber of Defrost Cycle per 24hr 0!99 hours 12
DLI Defrost Ter ination Te perature -50!120° 55°F
DTO Maxi u Defrost Duration 1!120 in 35 in
ELECTRICAL CO ECTIO S
The controller is provided with screw ter inal block to connect cables with a cross section up to 2,5
2
. Before
connecting cables ake sure the power supply co plies with the control’s require ents. Separate the probe cables
fro the power supply cables, fro the outputs and the power connections. Do not exceed the axi u current
allowed on each relay, in case of heavier loads use a suitable external relay or contactor’s.
PROBE CO ECTIO S
The probes shall be ounted with the bulb upwards to prevent da ages due to casual liquid infiltration. It is
reco ended to place the ther ostat probe away fro air strea s at return air for correct easure the average
roo te perature. Place the defrost ter ination probe a ong the evaporator fins in the coldest place, where ost
ice is for ed, far fro heaters or fro the war est place during defrost, to prevent pre ature defrost ter ination.

6/17 Rev. E 57-02410 12
SE SOR PROBE TEMPERATURE A D RESISTA CE
TC10K Temperature–Resistance
Te p
(ºC)
Te p
(ºF) R-low (Koh )
R-center
(Koh ) R-high (Koh )
-30 -22 109.522 113.347 117.294
-25 -13 84.823 87.559 90.374
-20 -4 66.270 68.237 70.255
-15 5 52.229 53.650 55.104
-10 14 41.477 42.506 43.557
-5 23 33.147 33.892 34.651
0 32 26.678 27.219 27.767
5 41 21.630 22.021 22.417
10 50 17.643 17.926 18.210
15 59 14.472 14.674 14.877
20 68 11.938 12.081 12.224
25 77 9.900 10.000 10.100
FI AL CHECK LIST
A. Check operating pressures.
B. Check electrical require ents of unit to supply voltage.
C. Set te perature control for desired te perature setting.
D. Check sight glass (if applicable) for proper refrigerant charge.
E. Check to ake sure the co pressor switch, behind the front grill, is on before start up the cabinet.
F. Check condensing unit for vibrating or rubbing tubing. Da pen and cla p as required.
G. All valves should be co pletely opened counter-clockwise.
H. Check packing nuts on all service valves.
I. Replace all service valve caps and latch unit covers.
Accessories
Description
IHC-27 IHC-48
Casters (4) 5” dia eter A297-11140 A297-11140
Tray Slides
9/16” lip ledge for 12” X 20” or 18” X 26” pans ( ust specify) A340-21100
1-
3/16” botto ledge for 12” X 20” or 18” X 26” pans ( ust specify)
A340-21200
Voltage Boosting Transfor er 39-01080 39-01080

6/17 Rev. E 57-02410 13
MASTER-BILT
®
PART LIST
The table below gives Master-Bilt
®
part nu bers. Use this chart when ordering replace ent parts for your IHC
cabinets. Always Advise Cabinet Serial Nu ber When Ordering Parts
Description IHC-27 IHC-48
Coil Defrost Heater 17-00442 17-09076
Co pressor 03-14403 03-14985
Condensate Heater 17-09412 17-09084
Condenser Coil 07-13076 07-14172
Condenser Fan Motor Asse bly 13-13436 13-13436
Electronic Controller 19-14605 19-14605
Box sensor T1 19-14244 19-14244
Evaporator sensor T2 19-14245 19-14245
Contactor 19-13934 19-13934
Door Handle 35-01488 35-01488
CRO Valve 09-00992 12.5p set 09-00987 22 # Setting
Door Gasket 37-01207 37-01211
Door Hinge-Inner Doors-L.H. 35-01451
Door Hinge-Inner Doors-R.H. 35-01452 35-01452
Door Hinge-Outer Doors 35-01450 35-01450
Door Tri 29-01481 29-01380
Drain Line Heater 17-09063 17-09063
Drain Pan Heater 17-09075
Drier 09-09171 09-09846
Evaporator Coil 07-00750 07-13084
Evaporator Motor Asse bly 15-13159 13-13439
Expansion Valve 09-09543 09-09543
Fe ale Plug 21-00577
Front Control 19-00899 19-00899
Heater Safety Control 19-01307 19-01307
Leg 27-00558 27-00558
Co pressor Switch 19-13118 19-13168
Shelves (Cantilever) 33-01519 33-01518
Sight Glass 09-09505
Re ote Display for Ele. Controller 19-14607 19-14607
Meter Long Cable for Ele. Controller 19-14608 19-14608
SALE A D DISSPOSAL
OW ER RESPO SIBILITY
If you sell or give away your Master-bilt cabinet you ust ake sure that all safety labels and installation – service
anual are included with it. If you need repace ent labels or anual, Master-bilt will provide the free. Contact
the custo er service depart ent at Master-bilt at [phone].

6/17 Rev. E 57-02410 14
DESCRIPTION
DATE MODEL(S)
IHC 27, 48
3/6/15
LAE BIT25 CONTROLLER
REVISION A
6/23/16
REVISION B
6/13/17

6/17 Rev. E 57-02410 15
DESCRIPTION
DATE MODEL(S)
IHC 27, 48
3/6/15
LAE BIT25 CONTR. REMOTE
REVISION A
6/23/16
REVISION B
6/13/17

6/17 Rev. E 57-02410 16
DESCRIPTION
DATE MODEL(S)
IHC 27, 483/6/15
LAE BIT25 BOOSTING TRANS
REVISION A
6/23/16
REVISION B
6/13/17