Master Bilt IHC-27 User manual

3/20 Rev. A 57-02699
IHC-27 & IHC-48
Ice Cream Hardening/Holding Cabinets
Installation & Operations Manual
Master-Bilt Products
908 Highway 15 North
New Albany, MS 38652
Phone: [phone]

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TABLE OF CONTENTS
INTRODUCTION……………….……………………………….………………………………..….……………………………3
WARNING LABELS AND SAFETY INSTRUCTIONS………..…..…………………………….………....…………….…..4
PRE-INSTALLATION INSTRUCTIONS………………………..…..…………………………….…….…..……...................5
Inspection for Shipping Damage…………………………………………………………......…………….………...5
INSTALLATION INSTRUCTIONS…………………………………………………………………..……..…………………...5
General Instructions…………………………………………………………………………….....…….……………..5
Mechanical ..………………………………………………………………………………………..………….………..5
Electrical…………...……………………………………………………………………….…….....……………....…..6
Maintaining your Equipment ..……………………………………………………………..………….….…..6
LEG AND CONDENSATE PAN INSTALLATION..........................................................................................................7
SERVICE INSTRUCTIONS....…………………………………………………...………………………….…..…………..…...7
Temperature Sensor, Defrost Heater and Fan Motor Replacement…………....................……..…………..….8
ELECTRONIC REFRIGERATION CONTROL…………………...…………………………………...………….…….….......9
Operations.........................................................................................................................................................9
Manual Defrost..................................................................................................................................................9
Changing the Set Point......................................................................................................................................9
Alarm Signals...................................................................................................................................................10
Electrical Connections......................................................................................................................................10
FINAL CHECK LIST……………………………………………………..……………………………….....…….…………..…10
PART LIST.....................................................................................................................................................................11
ACCESSORIES……………………………………………………………..…………………………….………………....…...11
SALE AND DISPOSAL…..…………………………………………………..………………………………….………......…..11
IHC-27 WIRING DIAGRAM………………..…………………..…………………………..………………….…………….......12
IHC-48 WIRING DIAGRAM………………..…………………..…………………………..………………….……………...…13

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INTRODUCTION
Thank you for purchasing a Master-Bilt® cabinet. This manual contains important instructions for installing, using, and servicing a
Master-Bilt® IHC case. A parts list is included with this manual. Read all these documents carefully before installing or servicing
your equipment.
STORE CONDITIONS
The Master-Bilt® IHCcases are designed to operate in the controlled environment of an air-conditioned store. The store
temperature should be at or below 75°F and a relative humidity of 55% or less. At higher temperature or humidity conditions, the
performance of these cases may be affected and the capacity diminished.
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 performance.
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.
NOTICE
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.
DANGER
Risk of fire or explosion. Flammable refrigerant used. Consult instruction manual/repair
manual/owner’s guide before attempting to install or service this product. All safety precautions
must be followed.
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.
DANGER
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.
NOTICE
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 manual covering refrigeration and electrical components contain technical instructions intended only for
persons qualified to perform refrigeration and electrical work.
This manual cannot cover every installation, use or service situation. If you need additional information, call or write us:
Customer Service Department
Master-Bilt Products
Highway 15 North
New Albany, MS 38652
Phone [phone]
Fax [phone]

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WARNING LABELS AND SAFETY INSTRUCTIONS
DANGER
Risk of fire or explosion. Flammable refrigerant used. To be repaired only by trained service personnel.
Do not puncture refrigerant tubing.
CAUTION
Risk of fire or explosion. Flammable refrigerant used. Consult instruction manual/repair
manual/owner’s guide before attempting to install or service this product. All safety precautions
must be followed.
NOTICE
Installation and service of the refrigeration and electrical components of the cabinet must be
performed by a refrigeration mechanic and/or a licensed electrician
NOTICE TO EMPLOYERS
You must make sure that everyone who installs, uses or services your cabinet is thoroughly familiar with all safety
information and procedures.
Important safety information is presented in this section and throughout the manual. The following signal words are used in the
warnings 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 cabinet 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
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 attached to the canbinet power cord

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PRE-INSTALLATION INSTRUCTIONS
INSPECTION FOR SHIPPING DAMAGE
You are responsible for filing all freight claims with the delivering truck line. Inspect all cartons and crates for damage as soon as
they arrive. If damage 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 damage is discovered when the cabinet is uncrated, immediately call the delivering truck line and follow up the call with a written
report indicating concealed damage to your shipment. Ask for an immediate inspection of your concealed damage item. Crating
material must be retained to show the inspector from the truck line.
INSTALLATION INSTRUCTIONS
GENERAL INSTRUCTIONS
1. Be sure the equipment is properly installed by competent service people.
2. Keep the equipment clean and sanitary so it will meet your local sanitation codes. Clean the cabinet with a mild detergent
and water, then rinse.
3. Rotate your stock so that older stock does not accumulate. This is especially important for ice cream. A "First-In, First-Out"
rotation practice will keep the products in good salable condition.
4. Do not place product in the cabinet 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 small quantities to store temperatures for short periods of time.
NOTICE TO STORE OWNERS / MANAGERS
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 moisture or liquid is observed around or under a Master-Bilt® cabinet, an immediate investigation should be made by qualified
personnel to determine the source of the moisture or liquid. The investigation should determine if the cabinet is malfunctioning or
if there is a drainpipe leaking.
MECHANICAL
Remove front grille and check refrigeration lines to see that they are free (not touching each other or compressor). Spin condenser
fan blade to see that it is free.
Remove cabinet from crate base and slide into location. Cabinet must be level from side to side and front to back for correct
draining of coil pan and for self-closing doors to operate correctly. Allow minimum of 4” between back of cabinet and wall and
between top of cabinet and ceiling for proper condensing unit air circulation.
To comply with Sanitation requirements the cabinet must be mounted on legs (6” high min.) or casters or the base must be sealed
to the floor with an N.S.F. listed silicone sealant.
To comply with UL requirements the cabinet must have a minimum clearance of 4” at the top, 6” at the rear and 0” at each side.

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ELECTRICAL
WARNING
Before servicing electrical components in the case or the doors or door frames make sure all power to case is off. Always
use a qualified technician.
Check voltage and amps drawn on (Page 17) to determine proper line and fuse or circuit breaker size. Check power supply for low
voltage. If voltage reads “120” with no load, and it drops below “107” when the compressor tries to start, it is an indication of too
small supply wiring or too long to run.
It is recommended that a separate circuit be run for each cabinet to prevent another appliance burning the fuse or tripping the
circuit breaker, causing loss of product.
WARNING
The cabinet must be grounded.
Maintaining your equipment.
Planned Preventative Maintenance (PPM), also referred to as planned maintenance, is a pre scheduled maintenance routine, set
out to ensure that your Refrigeration equipment is maintained and working efficiently.
Most service companies offer this service and will be glad to get you set up. The Frequency of this PPM will depend on your site
conditions.
Most PPM contracts are scheduled
 Monthly
 Quarterly
 Annually
Failure to keep your unit maintained can result in breakdowns and possibly voiding your units warranty.
Here is a list of some things that need to be checked although some programs vary pending needs and application.
 The condenser coil needs to be cleaned
 The condensate drains need to be cleared
 Fan motors and blades need to be cleaned of dirt and debris
 Inspect electrical connections
 Check door gaskets
 Monitor temperature and cycling
 Operational characteristics should be logged so they can be compared during future visits.
 Inspect Compressor and start components

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LOW TEMPERATURE FREEZERS – “IHC” Models
The power cords are rated 15A, 120 Volt for the IHC-27 and 20A, 120 V for the IHC 48 and are located on top of the cabinet at the
right rear for connection to power. On initial start-up the evaporator fan motors will not start and you cannot initiate a defrost until
the evaporator coil temperature has lowered to 25F. This is due to the thermostat. Also, the cabinet comes with a non-adjustable
“Front” control to keep the mullion heaters off until the cabinet temperature has lowered to 10F.
LEG AND CONDENSATE PAN INSTALLATION
1. Screw legs into existing crate mounting holes.
Condensate Heater Pan (IF PROVIDED)
Mount pan and bracket assembly to rear of cabinet with 2 large
sheet metal screws (supplied). Be sure pan is located directly
under cabinet drain.
Condensate Pan Assembly (OPTIONAL)
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 INSTRUCTIONS
1. High head pressure and high back pressure:
A. Condenser coil clogged or restricted
B. Condenser fan motor defective.
C. Air discharge in rear of cabinet restricted.
2. Low back pressure and low head pressure:
A. Restriction in system.
B. Refrigerant undercharged.
C. Leak in system
3. Pressure normal – cabinet warm:
A. Coil blocked with frost (see #4).
B. Refrigerant undercharged.
C. Control set too warm.
4. Cabinet not cycling – coil blocked with frost:
A. Defective temperature controller.
B. Refrigerant overcharged.
C. Location too hot.
D. Condenser clogged.
E. Condenser fan motor defective.
F. Defrost heater not operating.
5. Compressor starts and runs – but cycles on overload:
A. Low voltage
B. Relay defective.
C. Overload defective.
D. High head pressure (see #

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Temperature sensor, drain pan defrost heater, fan motor, drain line heater and temperature probe replacement
Before servicing the unit or replacing any components, technician must:
1. Turn the refrigeration rocker switch to the 0 position. This rocker switch is located on top of the cabinet at the back of the
control box behind the temperature controller. Once the swith is turned to the 0 position, remove the electric power cord
from the outlet. Once repairs are completed, do not forget to re-plug the power cord and return the refrigeration
rocker swith to the 1 position.
2. Remove screws from top front of venturi & drain pan and pull down
To change a temperature sensor disconnect the sensor wires from the controller and replace the new sensor in the original position.
Use plastic tie to tighten the new temperature sensor.to the hole in the fan shroud Make sure the sensor wires do not touch or are
not close to any heater rods. Replace Permagum at the cabinet top penetration as needed
To change drain pan defrost heater – remove screws from drain pan and pull down – disconect the electrical wires – Unclip the
defective heater from the venturi & drain pan. Use the reverse procedure to install the new drain pan defrost heater
To change drain drain line heter heater – remove screws from drain pan and pull down – disconect the electrical wires – Pull the
defective heater from the Drain line. Use the reverse procedure to install the new drain line heater
To change fan motor – disconnect fan motor leads and screws that attach motor to bracket
NOTICE
Do not replace components with just any random component due to the fact that this is a product that contains
flammable refrigerant. Refer to the part list in this manual for ordering replacement components,
It might be a good practice to stock a small quantity of parts for R290 condensing units (condenser fan motor, capacitors, condenser
fan blade, etc.) for timely manufacturing and field replacements.

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MASTER-BILT® ELECTRONIC REFRIGERATION CONTROL
OPERATION
Compressor When power is first turned on to the control, the LED indicator under COMP on the display starts blinking. The
cabinet will enter a defrost at start-up. The compressor(s) and the Defrost icon will be on. The defrost will last 6 minutes followed
by a 3 minutes dripping time. The compressor(s) icons will then be on if the temperature is above set point +7°F the evaporator
fan(s) Icon will then be on after a 2 minutes delay. After the initial defrost and between two consecutive defrosts the compressor(s)
and evaporator fan(s) icon will be on when the cabinet temperature is above set point + 7°F until the temperature drops to the set
point. The compressor(s) and fan(s) icon will then be of until the cabinet temperature rises above set point +7°F. A defrost with the
same timing sequence as the initial defrost will occur every 8 hours.
Display Lay-out
Fan – If a door is opened when the evaporator fan(s) is on, the fan(s) will be turned off for a duration of 1 minute. After this 1
minute delay the fan will be turned back on and the door open alarm DA will blink on the controller display and the alarm sounds
.
Defrost - The control uses timed defrost every 8 hours. Scheduled defrost can be bypassed by using the manual defrost feature
of the controller. During scheduled or manual defrost the display will show dEF and the LED indicator under dF is on.
MANUAL DEFROST
1. Push this DEFROST key for more than 2 seconds and a manual defrost will start.
2. While in defrost, Push and hold the DEFROST key for more than 5 seconds and the controller will end the
defrost cycle. The controller will then immediately start the compressor and evaporator fan.
HOW TO SEE THE SETPOINT (Box temperature cut-out)
1. Push and immediately release the SET key: the display will show the Set
point value;
2. Push and immediately release the SET key or wait for 5 seconds to display the probe value
(actual box temperature) again.
HOW TO CHANGE THE SETPOINT
1. Push the SET key for more than 2 seconds to change the Set point value;
2. The value of the set point will be displayed and the LED under COMP starts blinking;
3. To change the Set value push the UP ▲ or DOWN▼ arrows within 10s.
To memorize the new set point value push the SET key again or wait 10s.
NOTE 1: The set value is stored even when the procedure is exited by waiting the time-out to expire.
NOTE 2: Master-Bilt’s SETPOINT is factory set at a recommended –25F.LIST OF PARAMETERS

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Here is a list of the parameters the value of which can be changed in the programming mode, as well as their ranges.
Display
Symbol Description
Factory’s
Setting
SEt Temperature set point
-
25

F
Hy Cut-out temperature is Set + Hy, Differential
7

F
LS Minimum Temperature Set Point
-
37

F
Us Maximum Temperature Set Point
32

F
ALU High Temperature Alarm
30

F
ALL Low Temperatyre Alarm
-
45

F
Us High temperature alarm is enabled after a delay
45

F
AL
d
Temperature Alarm Delay
30 min
ALARM SIGNALS
Message
Cause
Outputs
“P1” Room probe failure Compressor output according to par. “Con” and “COF”
“HA” Maximum temperature alarm Outputs unchanged.
“LA” Minimum temperature alarm Outputs unchanged.
“dA” Door open Compressor and fans restarts
“EA” External Alarm Output unchanged
“CA” Serious External alarm(i1F=bAL) All output off
“CA” Pressure switch alarm (i1F=PAL) Outputs unchanged.
NOTE:
Probe alarm “P1” starts some seconds after the fault in the related probe; they automatically stop some seconds after the
probe restarts normal operation. Check connections before replacing the probe.
Temperature alarms “HA” and “LA” automatically stop as soon as the thermostat temperature returns to normal values
and when defrost starts.
ELECTRICAL CONNECTIONS
The controller is provided with screw terminal block or male terminals to connect cables with a cross section up to 2,5 mm2. Before
connecting cables make sure the power supply complies with the control’s requirements. Separate the probe cables from the
power supply cables, from the outputs and the power connections. Do not exceed the maximum current allowed on each relay, in
case of heavier loads use a suitable external relay.
FINAL CHECK LIST
A. Check operating pressures.
B. Check electrical requirements of unit to supply voltage.
C. Set temperature control for desired temperature setting.
D. Check to make sure the compressor switch, behind the front grill, is on before start up the cabinet.
E. Check condensing unit for vibrating or rubbing tubing. Dampen and clamp as required.