Williams Ref HFC-R134a Installation Manual

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

Overnight Thaw Cabinets

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 Overnight Thaw Cabinet has a temperature parameter set as follows:

+0°C (32°F) / +3°C (37°F)

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 MANUAL for
OVERNIGHT THAW CABINETS

Refrigerant Designation Global Warming Potential

HFC - R134a 1300

HFC - R404a 3260

INSTALLATION

Removal of Redundant Cabinets

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

Unpacking

Remove all external and interior packing and accessories. Ensure all such material is disposed of safely.

Ventilation

It is essential to ensure that the room in which the unit is to be installed has adequate ventilation. Refrigerators generate
a considerable amount of heat and, if operated in a small unventilated room in warm weather, they 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. A single door unit usually generates
1200W of heat and a two door version - 1800W (these figures are approximate).

In addition to ventilation in a room, please ensure that cabinets with top-mounted systems have 500mm clearance
between the cabinet top and ceiling for engineer access and ventilation, with 50mm clearance provided around the unit
to ensure efficient and effective performance. Do not block vents by stacking boxes on top or in front of the unit as this
could affect performance.

Castors

The cabinet should stand level to ensure correct operation of self-closing doors and proper drainage of condensate
from the evaporator.
Models fitted with castors and non-adjustable, therefore a level platform / floor should be provided where unit is to be
located. Where swivel and brake castors are fitted and when unit has been positioned, please ensure brakes have
been activated by pressing metal bar down. Remember to release brakes before trying to move unit.

Mains Connection

The unit comes fitted with a moulded plug for safety and must be earthed. If plug or cable should fail, please contact
the spares office on [phone] for a replacement.

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.

Connection to Main Drains

The Overnight Thaw requires connection to a main drain with a standard 1 1/2” fitting.

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
cabinet you are installing the slides. Offer the slide at a 45° angle as shown in Figure 1. Once in place let slide drop
into position creating a horizontal ledge on which the shelves will sit.

Shelf Weight Distribution

Before loading, allow cabinet to reach normal operating temperature.

When loading the unit, please ensure that load is equally distributed throughout and ensure air can circulate around
and through stored products. Ensure all items are covered and that raw and cooked foods are stored separately.

Fig. 1

Loading the Cabinet

Food placed inside the unit should be packed in such a way as to encourage thawing. For example, a cardboard box
full of frozen hamburgers could take days to thaw out if out into the unit within the cardboard box. However, if the
hamburgers are unpacked, loaded onto trays and placed inside the unit they will thaw in a matter of hours. For fastest
thawing, food should be uncovered as any type of covering will insulate food.

NB: Since the unit partially untilises the food to lower the temperature, it is recommended that the unit be
operated fully loaded whenever possible for amximum efficiency.

THERMOMETER

The controller is marked in Centigrade or Fahrenheit.
The Thermometer should be checked daily to ensure that correct temperature is being maintained.

CONTROL PANEL

GENERAL OPERATION OF THE OVERNIGHT THAW CABINET

The Overnight Thaw Cabinet is designed to control the thawing of frozen food. The principle of the unit is that it is
loaded with frozen food the afternoon prior to the day the food is required. The unit must be loaded in such a way as
to encourage thawing. Products should be on single trays and removed from their packaging.
The unit has two functions, firstly it is a refrigerator with a temperature range of 0°C to +4°C, secondly it is a heating
unit with a temperature range of -1°C to +2°C.
The refrigeration circuit operates immediately the unit is switched on and the temperature will reduce until it is within
the safe storage range, 0°C to +4°C.
When frozen food is placed inside the unit, the unit temperature will drop to below -1°C which will switch on the
heating circuit. As the temperature reaches +2°C the heating circuit will turn off and the cold food will again reduce the
temperature to -1°C causing the cycle described to be repeated.
The refrigeration / heating cycle is repeated until the temperature of the food is incapable of reducing the unit
temperature to -1°C. At this stage no further heat is required from the electric heaters and just the heat from the fan(s)
will be sufficient to continue the thawing process. However if at any time the temperature goes up to +4°C, the
refrigeration cycle will come back in place and reduce it to +1°C, thereby avoiding any possibility of the food
temperature rising to an unsafe level.

PLEASE NOTE: Due to the special operation of the equipment the standby button on the controller is disabled.

Adjusting the Operating Temperature

NB: All machines are preset at the factory, however conditions on site will vary compared with test conditions
and it may be necessary to perform the above adjustments several times in order to obtain a perfect
temperature cycle.

To adjust the operating temperature press and hold the

key. Use

and

keys to adjust.

Probe Fail-Safe Feature

The controller features a fail-safe condition. In the event of a temperature probe failure, the compressor will alternate
at 5 minute intervals indefinitely between running and not running condition and E1 or E2 will be displayed. Normal
compressor function will only be restored when the probe fault has been repaired.

Defrost Operation

When defrost is in progress, the defrost indicator on the control panel will become illuminated and dF will appear in the
LED display.
Defrost is automatic and at preset intervals the unit will go through an automatic defrost cycle. The defrost
operation does raise the temperature of the unit slightly for a short period but it does not affect the product stored
inside.

ROUTINE MAINTENANCE

All maintenance should be carried out by a competent, qualified person. We recommend regular preventative
maintenance using a qualified service provider in order to get the best from your equipment.

CLEANING

Exterior: If cabinet exterior is looked after correctly it will retain an

“as new” finish for many years. Normal day to day cleaning should
be carried out with a soft cloth and soapy water. For a stainless
steel finish, always wipe cabinet in same direction as the grain.
Whilst stainless steel is robust, the satin smooth finish can be spoilt
by wiping against the grain. Never use abrasive materials or
cleaners, or chemical cleaners. These can damage the surface and
cause corrosion. Occasionally, the exterior surface should be
polished with a good stainless steel polish to protect it.

Interior: Racking can be removed for easy cleaning (see Figure

2). The cabinet interior should be cleaned regularly with warm
soapy water and a soft cloth. Dry thoroughly afterwards and where
possible remove all racking and shelving to aid the process.

To remove racking and shelf supports, follow this procedure:

First remove shelves, then supports by gripping firmly at the
centre and lifting slightly. Turn shelf support towards cabinet
interior by pushing at the centre as you twist support through 90°.
The shelf support will be released. (Note: the supports are
designed to be anti-tilt and some resistance may be experienced at first. This will be overcome with practice).
When all shelves have been removed, remove the racking by lifting up and over the nylon retaining blocks.

FAULT DIAGNOSIS / DISPLAY CONDITIONS

Fault/Display Possible Cause Action

Cabinet not Operating No Power Supply Check fuse or power source

Cabinet not maintaining 1. Dirty Condenser Clean
temperature

2. Air circulation restricted Remove Restriction

3. Defective Fan Motor Call engineer

4. Defective Compressor Relay Call engineer

5. Loose electrical connection Call engineer

Faults displayed by E1 - Probe 1 Air Failure Call engineer
Control

E2 - Probe 2 Evaporator Failure Call engineer

Fig. 2

CONDENSER CLEANING

The condenser is part of the refrigeration unit and is located in the unit compartment. It requires cleaning approximately
4 times per year. To clean, disconnect mains supply before starting. Brush fins vertically with a stiff brush, taking
care not to damage them or push dirt/dust further in and vacuum away. Remember to reconnect mains supply once

finished.

Take care not to damage any electrical connections and cables during removing and the cleaning process. Replace
unit cover and plug cabinet in after completing cleaning process.

If there are further grease deposits still remaining on the condenser call your Service Provider to carry out a full
service.

NOTE: Non-compliance may invalidate your Warranty.

The condensing unit and refrigeration equipment can be accessed from above or in some cases behind.
Remove fixings in top and bottom edges of unit cover and pull unit cover away from cabinet and retaining
clips.

REPLACING THE GASKET

Door gaskets should be checked and cleaned regularly and replaced if damaged. To clean the
gasket, wipe with warm soapy water and a soft cloth, ensuring it is completely dry before closing the
door. DO NOT use a sharp knife to clean or scrape the gasket. Damaged gaskets do not seal
correctly and can increase the amount of electricity consumed, seriously affecting the efficiency and
performance of the cabinet.

Damaged gaskets are easily replaced. Simply pull out existing part and push new gasket into channel (gasket
retainer) at centre and work along, pushing gasket into channel. Continue with additional three sides, pushing corners
in last.

EVAPORATOR/DRAINLINE

Inspect periodically to ensure the drain hole is not blocked.

BREAKDOWN

In the event of a breakdown, please check thermostat setting and fuse before calling service engineer. When calling,
please advise model and serial number. This information can be found on the identification plate inside unit. It should
also be noted on the cover of this booklet. Please ensure that all redundant parts are disposed of safely and legally.

WARRANTY POLICY - Effecttive from 1st March 2010

Warranty applies to equipment manufactured by Williams
Refrigeration and equipment bearing the Williams name plate and
serial number identification tag.

We undertake, in conjunction with the supplying agent, distributor or
representative, to repair free of charge any such piece of equipment or
part thereof used which is found to be faulty in either materials or
workmanship.

Products Covered

A 24 months Warranty from the original date of purchase is given to
the following Williams equipment:

Garnet / Sapphire / Zircon / Jade / Amber (stainless) /
Mobile Heated / Mobile Refrigerated.
Reach-in Blast Chillers / Reach-in Blast Chillers Freezers.
Opal / Emerald / Onyx / Aztra / Salad Counters.
Crystal Bakery Cabinets and Counters.

A 12 months Warranty from the original date of purchase is given to
all other Williams equipment including:

All Modular Products (including Coldrooms).
Remote Systems (including Glycol).

Bottle Coolers.
Multidecks.
GEM Product Range.
Bottle Well / Meat Freezer Well.
Thermowell.
White Goods.
Non Standard Products.

Warranty Terms

The equipment has been installed correctly and has not been subject
to misuse or abuse but is functioning correctly.

The equipment was purchased by the authorised supplying distributor
direct from Williams Refrigeration and not through a wholesales or
other supplier whose warranty may be different.

The Warranty Policy shall be non-transferable.

Replacement of defective equipment can only be made with the
approval of Williams Refrigeration.

Any repair under warranty will only be carried out in its position of
operation or in a suitable location on the customer’s premises. If the
product has to be removed for security or any other reason, this will be
subject to additional charge (may include hydrocarbon charged
equipment).

Warranty work will be covered by Williams Refrigeration or by one of
its appointed agents between the hours of 8.00am and 5.30pm
Monday to Friday.

Exceptions to Standard Warranties

Second hand equipment.

The Standard Warranty is for Mainland GB only (does not cover

Marine equipment).

Any third party item(s) connected to the equipment that may affect

performance.
Components inlcuding gaskets, doors / drawers, handles, shelves,

trayslides, all internal fixings, plug and lead, connectors, the outer
shell, castors / legs, food probes, refrigerant and blockages as well
as consumable items such as (but not limited to) batteries, fuses,
light bulbs, printer cartridges, keys, glass and paper roll.
Any fault not reported within 10 working days of being discovered.
No claim shall exceed the original selling price.

Where equipment is manufactured to the customers’ own design,
Williams Refrigeration will not be liable for any non performance or
operation of the equipment as a result of a design fault.
The customer permits persons other than those authorised by
Williams Refrigeration to perform or effect repairs or adjustments to
the equipment.
Repairs are made using spare parts or replacements not of the
same make as those supplied originally as components of the
equipment unless authorised by Williams Refrigeration.

If authorised representatives of Williams Refrigeration are denied full

and free rights of access to the equipment for inspection during
normal business hours as previously stated.
The customer has not properly maintained the equipment or carried
out annual servicing, including cleaning the condenser, in
accordance with instructions, literature or directions issued

by Williams Refrigeration. (Operating Instructions are supplied with

all equipment but also available at www.williams-refrigeration.com).
The customer fails to observe commonly accepted operating

practices.

The customer uses or installs the equipment in such a way that it
exceeds its design envelope.
Call out and repair costs if no fault found or access denied.
The initial supply date shall apply to a replacement.

Equipment fails through misuse, abuse, accidental damage, power

surges or spikes, fire, flooding or acts of God.
Food and / or contents or the product ( including pharmaceutical).

Claim Procedure

If a customer wishes to make a claim under the terms of this
warranty, the following procedure should be observed:

Contact the supplying agent, representative or distributor.
Quote the model, date of installation and serial number of the
cabinet. The serial number is located on the cabinet identification
plate inside the cabinet. It should also be recorded on the
operating instruction booklet supplied with the cabinet.
Note: contents risk and insurance responsibility remains at all times

with the customer.

A current list of main distributors is avilable on request.

Extended Warranty

Extended Warranty offers the opportunity to protect your equipment
(subject to conditions outlined) for an additional period of up to 5 years
inclusive of original warranty periods.

Should you require Extended Warranty, state on your order or notify
the Dealer or Williams Sales Manager at the time of purchase and they
will be able to arrange it for you.

To ensure your Extended Warranty Policy remains valid, at least one
maintenance / service visit per year must take place in years 2, 3, 4
and 5.

All - Inclusive Parts & Labour Warranty

An all inclusive 2 year Parts & Labour Warranty, subject to the
Warranty Policy terms, is available from your Williams Dealer. Contact
your delaer for further details.

This warranty does not affect your statutory rights.

March 2010

WILLIAMS REFRIGERATION

Bryggen Road,

North Lynn Industrial Estate

King’s Lynn, Norfolk PE30 2HZ

Sales Tel: [phone] Fax: [phone]

Spares Tel: [phone] Fax: [phone]

Email: [e-mail]

Website: www.williams-refrigeration.com

WILLIAMS SILVER FROST

30 Route d’Ahun

23150 Lavaveix Les Mines

France

Tel: [phone] Fax: [phone]

Email: [e-mail]

Website: www.williams-silverfrost.com

WILLIAMS REFRIGERATION AUSTRALIA

38-42 Gaine Road

Dandenong South, Victoria 3175

Australia

Tel: [phone] Fax: [phone]

Email: [e-mail]

Website: www.williamsref.com.au

WILLIAMS HONG KONG

4A Harrington Building,

36-50 Wang Wo Tsai Street, Tsuen Wan,

North Territories, Hong Kong

Tel: [phone] Fax: [phone]

Email: [e-mail]

Website: www.williams-hongkong.com

Overnight Thaw O&M

Rev 4

March 2010