Williams Ref WMBC Installation Manual

This manual covers the Installation, Operation, Routine Maintenance and Cleaning
requirements for the following Williams Refrigeration products:

WBC/WBCF10 WMBC/WMBCF90 WMBF100 J1BC
WBC/WBCF20 WMBC/WMBCF120 WMBF200 WBC70
WBC/WBCF30 WMBC/WMBCF160
WBC/WBCF40 WMBC/WMBCF200
WBC/WBCF50 WMBC/WMBCF240

WMBC/WMBCF320

Provided the instructions in this Operating Manual are read and implemented correctly,
the optimum performance and reliability of your equipment should be maintained.

The Williams range of Reach-In Blast Chillers has temperature parameters set as follows:
+90°C (194°F) / +3°C (37°F)

The Williams range of Reach-In Blast Chiller Freezers has temperature parameters set as
follows:
+90°C (194°F) / +3°C (37°F) and +90°C (194°F) / -18°C (0°F)

The Williams range of Modular Blast Chillers, Chiller Freezers and Freezers are designed to
blast chill/freeze products:

WMBC +90°C (194°F) / +3°C (37°F) in 90 minutes or less
WMBCF +90°C (194°F) / +3°C (37°F) in 90 minutes or less

+90°C (194°F) / -18°C (0°F) in 240 minutes or less

WMBF +90°C (194°F) / -18°C (0°F) in 240 minutes or less

Also designed to hold product at the following temperatures:

WMBC +3°C (37°F)
WMBCF +3°C (37°F) (blast chill cycle) or -18°C (0°F) (blast freeze cycle)

WMBF -18°C (0°F) (blast freeze cycle)

Declaration of Conformity References:
Low Voltage Directive 2006/95/EC
Machinery Directive 2006/42/EC
Electromagnetic Compatibility Directive 2004/108/EC
Pressure Equipment Directive 97/23/EC
Waste Electrical and Electronic Equipment Directive (WEEE) 2002/96/EC
Restriction on Use of Certain Hazardous Substances Directive (RoHS) 2002/95/EC

CFC Free Refrigerant

Williams Refrigeration declares that all products manufactured by Williams Refrigeration
comply with the above directives as they apply to those products, and those products are
therefore declared to be in conformity with the provisions of the above legislation.

Model No.:

Serial No.:

OPERATING and ENGINEERS MANUAL for
REACH-IN and MODULAR BLAST CHILLERS,
BLAST CHILLER FREEZERS and BLAST FREEZERS

Refrigerant Designation Global Warming Potential

HFC - R134a 1300

HFC - R404a 3260

REMOVAL OF REDUNDANT UNITS

Please ensure the old / redundant panels and
refrigeration equipment are disposed of safely and
legally.
It is recommended that doors are removed prior to
disposal in order to ensure safety.

INSTALLATION

Remove all external and interior packing and
accessories. Ensure all such material is disposed of
safely.
The Roll-in Blast Chillers/Chiller Freezers and Freezers
are supplied modular form on pallets and require
assembly on site. Please see additional manual on
assembly.
Stainless steel sections are protected with plastic film
when shipped. Prior to assembly remove the film from
any surfaces to be joined together and thoroughly clean
the surfaces thus exposed to remove any residual
adhesive. White spirit is useful for this purpose. Once
assembly is complete you may remove the rest of the
film.
Please ensure all film and waste materials from
unpacking and assembly are disposed of safely once the
process is completed.

VENTILATION

It is essential to ensure that the room in which the
unit is to be installed has adequate ventilation.
Refrigeration equipment generate a considerable amount
of heat and, if operated in a small unventilated room,
especially in warm weather, will quickly cause the room
temperature to become excessive. This could cause the
motor to overheat and possibly damage the windings. At
the very least, such an installation will cause the unit to
use an excessive amount of electricity.
In addition to ventilation in a room, please ensure that
cabinets with top-mounted systems (WBC/WBCF50)
have 500mm clearance between the cabinet top and the
ceiling for engineer access and ventilation. For all other
cabinets, please ensure a minimum adequate clearance
of 50mm/2” is provided around the unit to ensure efficient
and effective performance. Do not block vents by
stacking boxes on top or in front of unit as this could
affect performance.
Roof mounted pod storage refrigeration systems require
adequate ventilation as well.

Levelling/Castors/Feet

The Reach-In Blast Chillers/Chiller Freezers should
stand level to ensure correct operation of self-closing
doors and proper drainage of condensate from the
evaporator. All models (except WBC/WBCF50) feature
automatic evaporation so no drain is required.
Models fitted with castors are non-adjustable, therefore a
level platform/floor should be provided where cabinet is
to be located. Where swivel and brake castors are fitted

and when the unit has been positioned please ensure the
brakes have been activated by pressing the metal bar
down. Remember to release the brakes before trying to
move the unit. On models fitted with adjustable legs, lev­elling may be achieved by adjusting the bottom section of
the legs. For marine specification models with flanged
feet or deck fixing and bulkhead fixings, installation
should be carried out by a specialist marine company.

Shelf/Slide Fitting

When positioning the slides, present the slide to the
racking by holding it in the opposite hand to the side of
the unit you are installing the slides. Present the slide at
a 45° angle (see Figure 1). Once in place, let the slide
drop into position creating a horizontal ledge on which
the shelves will sit.

Fig. 1

Mains Supply Connection

Installation is to be carried out by a competent and qual­ified person or persons. Install according to local codes
and regulations and use the following:

Copper conductors only, for mains supply wiring.
Use conductors with a minimum cross-sectional area
(CSA) of 12AWG (4.00mm

2

).
Suitable overcurrent protective device (fuse/circuit
breaker) with a 10kA or greater braking capacity.

power supply before servicing.
* Applicable to the U.S.A cabinets only.

WBC/WBCF10 & 20 are single phase and come fitted

with moulded plug for safety and must be earthed. We
recommend that should the plug or cable fail contact
Williams spares office for a replacement part.

WBC/WBCF30 & 40 are single phase. They should be
connected to a 16A single phase supply by a qualified
refrigeration engineer or electrician.

WBC/WBCF50 are 3 phase. They should be connected
to a 16A 3 phase and neutral power supply. This should
be carried out by a qualified refrigeration engineer or
electrician.

If the cabinet has been laid on its back or tipped,
DO NOT switch on immediately. Leave in an upright
position for at least 1 hour before switching on.

2

* WARNING! Risk of electric shock. Some
conductors remain live when the equipment
is in ‘Standby’ mode. Disconnect from the

NB: WBC/WBCF50 requires then condensate drain
pipe to be connected to a suitable 22mm (7/8”) waste
pipe or larger ‘P’ trap or routing to an open floor
drain. (This can be found at the base of the cabinet
rear).

LOADING AND USING YOUR BLAST CHILLER

The maximum temperature of product entering the Blast
Chiller/Chiller Freezer/Blast Freezer must not exceed
+90°C (194°F). Regulations state that product should be
placed in the Blast Chiller/Chiller Freezer/Blast Freezer
within 30 minutes from completion of cooking.
The packaging of food and the way in which it is loaded
or placed within the equipment can have a significant
effect on the time within which the temperature can be
reduced to the require level and the amount of food which
can be processed in each chilling or freezing batch.
(Maximum food thickness 50mm).
When blast chilling always use metal or foil containers
which are good conductors. Plastic or polyurethane
containers insulate the food from the cold air. When
chilling unportioned food we recommend the use of the
appropriate gastronorm tray or similar. Likewise, placing
lids or covers on food will also increase the chilling time
but may be of some use when processing some delicate
foods to avoid dehydration. When blast freezing bear in
mind how easy the finished produce will be to thaw.
Always load your machine in such a way that it is
possible for the cold air to contact all sides of the con­tainers. Avoid stacking containers directly on top of one
another as this will drastically extend the chilling time and
take special care not to block the air ducts.
Always load the machine before selecting the blast
facility. Unless it is unavoidable do not open the door of
the machine whilst the blast cycle is engaged.
When loading the cabinet/trolley please ensure the load
is equally distributed throughout the cabinet and ensure
air can circulate around and through stored products.

THERMOMETER

The controller is marked in Centigrade or Fahrenheit.
The Thermometer should be checked daily to ensure that
correct temperature is being maintained.
If the cabinet is operating at the wrong temperature due
to a fault the cabinet will alarm.

STORAGE TIMES

Chilled foods can be stored for up to 5 days at between
0°C (32°F) and +3°C (37°F).
Frozen foods can be stored for longer periods, in
general. for up to 8 weeks without loss of nutrients or
palatability. Beyond 8 weeks those foods with a high fat
content may display some signs of rancidity.
Nevertheless, some other foods can be stored for periods
longer than 8 weeks. Frozen food must be stored at
between -18°C (0°F) and -22°C (-8°F) or below.

Important: Once thawed, frozen food should not be
re-frozen.

CONTROL PANELS

PRINCIPLES OF OPERATION

Williams Blast Chillers/Chiller Freezers/Blast Freezers
have been designed to quickly reduce the temperature
of food in accordance with Department of Health
Guidelines on the chilling and freezing of cooked foods.
All operators should be conversant with latest European
Food Safety Legislation.
Further information is also contained in the Williams
Guide to Cook Chill which is available from Williams
Marketing Department - [phone].
Fast temperature reduction is not brought about by
placing the food in a very cold cabinet like a deep freeze.

This would only dry the food badly and would take a very
long time to reduce its temperature to the required level
increasing the risk to food safety. The secret of fast
temperature reduction is in delivering the correct blast of
air and ensuring correct and unobstructed horizontal air
flow inside the cabinet.
Williams range of Blast Chillers feature the option of soft
and hard facility on blast chill offering flexibility and
ensures food stays in prime condition whether it is
delicate pastries or fish, or heavier items such as lasagne
and meat casseroles.

Exceptions: depending on the density types and
sizes of the portions the chiller/freezer might not be
capable of achieving the required guidelines
therefore the load and/or depth of the food layers

3

Blast Chiller (WMBC) - no printer

Blast Chiller (WMBC) - printer

Blast Chiller (WBC)

Blast Chiller Freezer (WBCF)

should be reduced. You may find it necessary, there­fore, to experiment with different amounts of food
and loading methods in order to achieve the
optimum performance with your blast chiller/freezer.

OPERATION OF BLAST CHILLERS / CHILLER
FREEZERS

Initially the cabinet will be in standby mode, shown by 3
dashes (- - -) in both display windows. The cabinet needs
to have run at least half an hour before being used.

All Blast Chillers have 3 basic modes:

1. Normal storage +1°C (34°F) to +3°C (37°F)

2. Blast Chill Hard +10°C (14°F)

3. Blast Chill Soft +1°C (34°F)

Combination Blast Chiller Freezers have 2 further
modes:

4. Freezer Storage -18°C (0°F) to -22°C (-8°F)

5. Blast Freeze -25°C (-13°F)

Dedicated Blast Freezers have the same two modes.

STORE MODE

During store mode (with no alarm condition or defrost
cycle running) the left hand window will display the
previous blast cycle duration and the right hand window
will display the store temperature. Some chillers have
more than 1 fan installed these may not all operate
during the storage mode, giving a reduced air circulation
within the chiller.

The type of store mode is indicated under button
Press button to select the right storage temperature if
using the combination chiller freezer.

From store mode the following functions can be
achieved:

1. Go into standby mode by pressing and holding

for 3 seconds.

2. Initiate the setting of a blast chill or freeze cycle by

pressing

3. Initiate a manual defrost by pressing and holding

both and for 3 seconds.

4. Pressing during a probe cycle only will cause all
enabled food probes and their respective temperatures

can be displayed in a scrolling process (each probe’s
information is displayed for 4 seconds):

5. Further pressing during a blast cycle will cause the

displays to revert back to the standard display (ie time

and temperature). Also, cancelling the blast cycle or
when the blast cycle ends the display will revert back
to the standard food probe display.

If no button is pressed for 10 seconds or if is pressed
at any time the cabinet returns to normal store mode.

Function 5 can be initiated in any operating mode except
in standby.

BLAST CHILL OR FREEZE PROGRAMMING

Check that the chiller is operating at storage
temperature. Load the products for chilling/freezing ­refer to the previous loading information. If using, place
the food probe into the centre of the product to be chilled.
Then programme the cycle as follows:

1. By pressing button ‘1’ to select the desired type of
blast - soft blast (4 blocks), hard blast (2 blocks) or freeze
(single block). (Freeze option on Blast Chiller Freezer
models only).

2. By pressing button ‘2’ select timer for the desired
duration either 90 or if blast freezing 240 minutes or
probe (temperature controlled cycle).

3. By pressing button ‘3’ start the blast chill or freeze
cycle.

If you are not happy with your selection press the
button to cancel your selections and the cabinet will
revert back to store mode. Pressing this button will stop
the blast chiller mid cycle and will keep the time displayed
following cancellation until a new blast cycle is
programmed - this will be displayed in the left window.

During defrost or blast cycle it is not possible to enter the
blast set mode.

When a Blast Cycle has been initiated - the following will
be displayed:

Left window - time counting up Right window - clockwise rotating

LED’s signifying a cycle in progress

The blast cycle is ended under normal operation by:

- Reaching the required temperature +3°C (37°F) or

-18°C (0°F).

- Reaching the end of the designated time (90 or 240
minutes).

- Manual cancellation of the cycle by pressing and
holding for 2 seconds.

- Putting the controller into standby mode by pressing

A blast cycle may also be terminated due to the following
faults or failures:

- Over temperature fault

- HP/LP fault (if enabled)

- Air probe (T1) failure

- Food probe failure - terminates the blast cycle if all the
food probes fail. If a 3 probe system is used, and 1

4

FP1 03

FP2

02

00

5

ALARMS

When a fault or adverse operational condition arises, an
audible and visual alarm will be initiated:

General alarm in left window / right window will
show mode (storage temperature/blast or
defrost)

Mains failure alarm in left window / right
window will show mode (storage
temperature/defrost) (longer than 3 minutes)

The alarm will sound intermittently. Press to mute the
alarm, the alarm will retrigger if the fault causing the
alarm has not been addressed. The alarm mode will still
be displayed.
More information on the alarm can be displayed during
normal operation by accessing the diagnostic menu by
pressing and holding for 3 seconds.

Left window indicates alarm - the right window indicates
the type of alarm.

When a probe is at fault then the windows will display as
follows:

Left window indicates probe type and the right window
indicates the fault type.

T1 - air probe T4 - Food probe 1
T2 - evaporator T5 - Food probe 2
T3 - auxiliary probe (not applicable) T6 - Food probe 3

Alarm codes that are displayed are:

E1 - HP/LP fault (not applicable)
E2 - Over temperature
E3 - Mains failure longer than 3 minutes
Hi - High temperature
Lo - Low temperature
or - Probe over range failure

Alarms during Blast Cycles

If the blast chill cycle has been terminated as a result
causing an alarm, a defrost cycle will automatically be
initiated. However, if an alarm occurs such as
evaporator probe (T2) fault then the blast chill cycle will
continue.

Door Operated Fan & Condensing Unit Cut Out
Switches

If the door is opened during blast or store mode the
refrigeration unit and evaporator fans will cut out. Both
will restart on closure of door.
Note: it is not advisable to open the door during blast
mode as this will effect the cycle.

probe fails, the cycle will continue until the last working

probe reaches temperature.

- Mains failure longer than 3 minutes.

The LED’s beneath the right-hand display window
indicate whether or not each enabled food probe has
achieved the target temperature (temperature setpoint).
If the LED is illuminated, the food probe relevant to that
LED is yet to reach the target temperature. Thus, if it is
not illuminated, the food probe relevant to that LED is yet
to reach the target temperature. Thus, if it is not
illuminated, that food probe has achieved the target
temperature. The LED will illuminate once more when
the temperature relevant to that probe reaches 10°C
(10°F) above the target temperature (for example:
inserted into hot food).
At the end of a cycle, an audible alarm will sound for 10
seconds with the left window displaying the time and in
the right window the LED’s will start flashing.

DEFROST

A defrost cycle is automatically instigated at the end of
each blast chill cycle to clear any ice from the
evaporator ready for the next cycle. During storage
mode a defrost will be performed automatically at the
factory preset interval of 6 hours. If a blast cycle is
cancelled the machine will automatically initiate a defrost.

During a defrost the display windows will indicated the
following:

Following a blast chill cycle

An alarm condition is present

A mains failure has taken place and no blast
chill cycle has been initiated since the mains
failure

A manual defrost can be initiated by pressing and
holding both and

During the defrost cycle all fans will stop running. When
the defrost cycle is finished the compressor will run for
approximately 60 seconds before the fans cut in. It is
safe to leave products in the cabinet during the defrost
cycle - the air temperature rises slightly but will not affect
the products stored.
After every defrost there is a short period - about 5
minutes during which a blast cycle cannot be pro­grammed. This short interval is to allow defrost water to
drain away from the evaporator. At the end of each cyle,
a defrost will automatically clear any ice from the evapo­rator ready for the next cycle.

90

dF

AL

dF

- - -

dF

AL

03

- - -

dF

AL

E3

T1

or

6

AIRFLOW

In the unlikely event that your blast chiller is taking longer
to perform it’s chilling cycle, ensure that the system is op­erating in the correct way. A possible explanation is that
the fan system has been installed the wrong way round.

As a result the airflow within the blast chiller will not work
as effectively as it should. Se the
diagram.

COMPLIMENTARY COMPRES­SOR CONTROL

In addition to the conventional op­eration of the compressor, the following com­plementary function applies;

Compressor Rest Time

This function is to ensure that the main compressor used
does not run too frequently, and succumb to damage.
The parameter “crt” can be adjusted accordingly. The
compressor rest time does not apply to the beginning of
a blast cycle or hot gas defrost cycle.

Compressor Duty Cycle

This function performs the task of over-riding the
controller’s logic when an air probe (T1) fails, thus
preserving the food until a service engineer intervenes.
The parameter “cdc” controls the number of forced
compressor cycles per hour.
Example: If set to 5, the compressor (compressor used
for store) will alternate, 5 minutes running, 5 minutes off
and so on.

High Pressure/Low Pressure Control

To enable the High Pressure/Low Pressure control, the
parameter “PS” must be set to “YES”. Once set the
main compressor relay output is additionally controlled
by the High Pressure/Low Pressure switch (terminals L3
and L2 in series with terminal L1). If the High Pres­sure/Low Pressure input goes open circuit, then the main
compressor will stop running and an alarm “E1” will be
displayed.
NB: If the High Pressure/Low Pressure input goes open
circuit during a hot gas defrost, the alarm is ignored. A
subsequent refrigeration cooling cycle will trigger the
alarm if the input stays open circuit.
If a High Pressure/Low Pressure switch is not fitted then
terminals L2 and L3 have to be linked.

THERMOSTATS AND PROBES
Thermostats

The controller can, via the set of thermostat parameters,
control the refrigeration for soft blast chill, hard blast chill
and chill store.
All have independant parameters for set points and the
two hysteresis parameters are for the chill thermostats
and freeze thermostats.
NB: The soft blast chill thermostat is a “delta” (floating)
value to be added to the store chill thermostat set point
to achieve the final soft blast chill thermostat set point.
Example: If the store chill thermostat is set to +3°C
(37°F), and the soft chill value is set to -2°C (34°F), then
the achieved soft blast thermostat will be +1°C (28°F).

Probes

The type of probe sensor used for all probes is of the
KTY-81-121 type.
The controller will always require the air (T1) and
evaporator (T2) probes. The number of food probes is
selectable from 0 to 3.
If the number of food probes is set to 1, then only the
alarm, diagnostics and temperature controlled blast cycle
will be respective to probe (T4). All other food probes
(T5 and T6) will be ignored. The auxiliary probes (T3)
function can be selected via the parameter “3PM”
(default to “no”).
NB: If any probe is enabled but not connected, a probe
failure will arise.
All probes have an offset parameter to compensate for
temperature drift and manufacturing tolerances of the
probes.

MISCELLANEOUS FUNCTIONALITY
Condenser Clean

The condenser will require cleaning from time to time. A
timer parameter “Acc” is used to log the compressor run
time (units of weeks). After the preset period a warning
is announced.
For the purpose of notifying the user, a designated
condenser clean button and LED are used. A flashing
red LED signifies that the condenser requires cleaning.
Pressing and holding the button for 3 seconds will reset
the timer and the LED will stop flashing.

Display Slow Down

The purpose of applying a “display slow down” is to delay
the real time temperature being displayed on the
controllers front control interface. This will avoid rapid
fluctuations displayed when a door is opened, or when
the controller is “hunting” the instantaneous temperature.
This is achieved by introducing a thermal mass
simulation routine in the software to stimulate a thermal
mass inside the chiller. The parameter “SiM” (default to

3) is used, and an example being a value of 100
simulates a 0.5 litre (0.1 Gallon) bottle of water.