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NOVA™ ICE CREAM HARDENING AND HOLDING CABINETS
Models NX201WWW/0, NX201WWW/4 & NX362WWW/4
Installation, Operations and Maintenance
Instructions
151555 Rev. A 07/12
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TABLE OF CONTENTS
INTRODUCTION 3
STORE CONDITIONS 3
WARNING LABELS AND SAFETY INSTRUCTIONS 4
PRE-INSTALLATION INSTRUCTIONS 4
Inspection for Shipping Damage 4
INSTALLATION INSTRUCTIONS 4
General Instructions 4
Mechanical 5
Electrical 5
Leg and Condensate Pan Installation 6
SERVICE INSTRUCTIONS 6
TEMPERATURE SENSOR, DEFROST HEATER AND FAN MOTOR
7
REPLACEMENT
ELECTRONIC REFRIGERATION CONTROL 8-10
SENSOR PROBE 11
FINAL CHECK LIST 12
PART NUMBERS 13
ACCESSORIES 13
SALE AND DISPOSAL 13
WIRING DIAGRAM - NX201WWW/0 14
WIRING DIAGRAM - NX201WWW/4 15
WIRING DIAGRAM - NX362WWW/4 16
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151555 Rev. A 06/12
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INTRODUCTION
This manual contains important instructions for installing, using, and servicing your Hardening and
Holding Cabinet case. A parts list is included with this manual. Read all these documents carefully
before installing or servicing your equipment.
STORE CONDITIONS
The Hardening and Holding Cabinet cases 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 Hardening and Holding Cabinet 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
Improper or faulty hook-up of electrical components on the refrigeration units can result in severe
injury or death.
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 have the serial number at hand and call the Customer Service Department.
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WARNING LABELS AND SAFETY INSTRUCTIONS
This symbol is the safety-alert symbol. When you see this symbol on your cabinet or in
this manual, be alert to the potential for personal injury or damage to your equipment.
Be sure you understand all safety messages and always follow recommended precautions and safe
operating practices.
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 Hardening and
Holding Cabinet case at the factory. Follow all warning label instructions. If any warning or safety
labels become lost or damaged, call your customer service department for replacements.
This label is located on top of the electrical control label and on the wiring channel.
CAUTION!
GROUND REQUIRED
FOR SAFE OPERATION
This label is attached to the cabinet power cord on models with a 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 case when it is soft or partially thawed. Also, product should not be put
in the case for at least 4 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 Hardening 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.
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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.
Check for electrical wires that may have moved during shipping.
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 NSF 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.
ELECTRICAL
WARNING
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 amps drawn on to determine 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
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
blowing the fuse or breaker, causing loss of product. All circuit breaker to be “HACR” type or fuses to
be time delay type.
** The cabinet should be grounded. **
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LOW TEMPERATURE FREEZERS – “NX201WWW” Models
The Hardening and Holding Cabinet has a power cord in the bottom 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 35°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 FOR TOP MOUNT CABINETS ONLY
1. Screw legs or casters into existing crate mounting holes.
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
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
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TEMPERATURE SENSOR, DEFROST HEATER AND FAN MOTOR REPLACEMENT
Before making any change, technician should:
1. Disconnect power to the cabinet
2. Remove screws from venturi and pull down
To change a temperature sensor (cabinet zone sensor or defrost termination sensor), simply
disconnect the sensor wires from the controller and replace the new sensor in the original position.
Use plastic tie to tighten the zone sensor. Insert the sensor for defrost termination firmly 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, remove screws from drain pan and pull down. Remove screws from coil
mounting straps, spring straps open, remove heater shield and pull heater out of slots in coil fins.
To change fan motor, disconnect fan motor leads and remove screws from fan guards and motor
mounts.
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ELECTRONIC REFRIGERATION CONTROL
D sp ay Lay ou
Compressor
When power is first turned on to the control, the controller will go through the start-up delay. After a
one- minute delay, the compressor comes on. The LED for cooling indicator stays on while
compressor relay is energized. Display will show actual box temperature. Picture above is the display
layout. The compressor will be cycled off when the actual box temperature 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 temp is above
the 35°F. When in defrost mode, the fan is off until the end of the defrost and the 2 minute drip time
has passed. There is 2 minutes delay after a defrost before the fan comes on. If the Evaporator
temperature is 35°F or below the controller will override the fan delay. FAN indicator is on while FAN
relay is energized.
Defrost
The control uses time defrost with four defrosts per day. The defrost scheme can be re-set for special
applications. During defrost, the display will show dEF and the defrost indicator on. The control begins
timing the defrost when power is turned on. Four defrosts per day means it will occur every six hours.
To have defrost occur at 8am, 2pm, 8pm, and 2am then power up at one of these four times.
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MANUAL DEFROST
AHA
ALA
A
y
Defrosting my also be induced manually by keeping the defrost button for 3 seconds. Once defrost
has started, the defrost will go through a defrost and drip time pull down cycle.
HOW TO CHANGE THE SETPOINT
HOW TO CHANGE A PARAMETER VALUE
NOTE 1: The set value is stored even when the procedure is exited by waiting the time-out to expire.
NOTE 2: The SETPOINT is set at a recommended –20°F at the factory.
NOTE 3: To scroll down the parameters without changing them, press the DOWN button.
LIST OF PARAMETERS
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 Parameter Range Factory Setting
SP Temperature Set Point SPL.SPH -20°F
HYS Temperature Differential 1 to 255°F 7°F
SPL Minimum Temperature limit -35.SPH -35°F
SPH Maximum Temperature limit SPH.120° 15°F
High Temperature alarm -50.120° 35°F
Low Temperature Alarm 50.120° -45F
TD Temperature Alarm Dela
0.120min 30min
DFR Number of Defrost Cycle per 0.24 4/day
DLI Defrost Termination -50.120° 55°F
DTO Maximum Defrost Duration 1.120min 30min
ELECTRICAL CONNECTIONS
The controller is provided with screw terminal block 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 or contractor’s.
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PROBE CONNECTIONS
The probes shall be mounted with the bulb upwards to prevent damages due to casual liquid
infiltration. It is recommended to place the thermostat probe away from air streams at return air for
correct measure the average room temperature. Place the defrost termination probe among the
evaporator fins in the coldest place, where most ice is formed, far from heaters or from the warmest
place during defrost, to prevent premature defrost termination.
SENSOR PROBE TEMPERATURE AND RESISTANCE
NTC10K Temperature–Resistance
Temp
(ºC)
Temp
(ºF)
R-low
(Kohm)
R-center
(Kohm)
R-high
(Kohm)
-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
SENSOR PROBE
NOTICE: If the probe assembly is disconnected from the main board during normal operation (unit
running), the connectors must be installed in the same position that they had before disconnection (P1
and P2), otherwise the control will not function properly.
The Electronic Refrigeration Control sensors have NTC thermistors. The reference resistance is
30,000 ohms at 77°F (25°C). It carries NTC thermistors with a range of –55°f to 199° F. In case there
is a failure, these sensors should be used in replacement of the sensors shipped with the control. In
order to diagnose faults in the probe, the control has LED functions as a diagnostic tool. When power
is supplied to the control, the LED will turn on and will remain on as long as this condition is satisfied.
When there is a fault in the probe, the LED will blink intermittently. When this occurs, the probe
assembly needs to be replaced. If power is supplied to the control and the LED remains off, there is a
failure in the main relay control and it needs to be replaced.
In case of a probe failure, the control will go into a safety mode of operation. While in safety mode the
control ignores probe inputs and cycles the compressor on for 6 minutes and off for 4 minutes. The
LED will be blinking and signaling that there is something wrong with the probe (E1/E2). To replace
the sensor probes, disconnect power to the control, replace the probes and restart the unit. Since the
wire is fixed to the cabinet, a technician may cut the sensor wire inside the cabinet and splice it with a
new sensor.
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FINAL CHECK LIST
A. Check operating pressures.
B. Check electrical requirements of unit to supply voltage.
C. Set temperature control for desired temperature range.
D. Check sight glass (if applicable) for proper refrigerant charge.
E. Check system for proper defrost settings and operation.
F. Check condensing unit for vi brating or rubbing tubing. Dampen and clamp as required.
G. All valves should be completely opened counter-clockwise.
H. Check packing nuts on all service valves.
I. Replace all service valve caps and latch unit covers
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PARTS LIST
A
A
)
The table below gives Factory’s numbers. Use this chart when ordering replacement parts for your
Hardening Cabinets. Always advise Cabinet Serial Number when ordering parts.
Description NX201WWW/O NX201WWW/4 NX362WWW/4
Cabinet Frame Heater 17-09419 17-09150 17-09150
Coil Defrost Heater 17-09407 17-09440 17-09440
Compressor 03-14902 03-14960 03-14960
Condenser Coil 07-13391 07-13391 07-13391
Condenser Fan Blade 15-13093 15-13093 15-13093
Contactor 19-13936 19-13934 19-13934
Condenser Fan Motor 13-13271 13-13272 13-13272
Controller 19-14243 19-14242 19-14242
Box Sensor (P1) 19-14244 19-14244 19-14244
Evaporator Sensor (P2) 19-14245 19-14245 19-14245
Door Gasket 37-01321 37-01321 37-01321
Door Hinge-Outer Doors 35-01450 35-01450 35-01450
Door Trim 29-01379 29-01379 29-01379
Drain Line Heater 17-00404 17-09063 17-09063
Drain Fitting 11-01410 11-01410 11-01410
Drier 09-09171 09-09171 09-09171
Evaporator Coil 07-13288 07-13288 07-13288
Evaporator Fan Blade 15-13106 15-13106 15-13106
Evaporator Fan Guard 25-01324 25-01324 25-01324
Evaporator Fan Motor 13-13269 13-13270 13-13270
Expansion Valve 09-09445 09-09445 09-09445
Drain Line heater plug 21-00577 21-00577 21-00577
Front Control 19-13897 19-13897 19-13879
Heater Safety Control 19-01164 19-01164 19-01164
Leg Leveler 27-00592 27-00592 27-00592
Compressor Switch 19-13118 19-13118 19-13118
Shelves 33-01763 33-01763 33-01763
ir Valve 11-01720 11-01720 11-01720
Shelf Clip 33-01011 33-01011 33-01011
Switch Hinge 35-01506 35-01506 35-01506
Run Capacitor * * *
Start Capacitor * * *
Start Relay * * *
* consult factory
Accessories
Description NX201WWW/O &
Casters (4) 5” diameter
297-11140
Voltage Boosting Transformer 39-01080 (208-230V
SALE AND DISPOSAL
OWNER RESPONSIBILITY
If you sell or give away your cabinet, you must make sure that all safety labels and the Installation
Service Manual are included with it. If you need replacement labels or manuals, contact the Customer
Service Department and we will provide them for free.
The Customer Service Department should be contacted at the time of sale or disposal of your cabinet
so records may be kept of its new location.
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