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.