Thermo Scientific 20ERCETSA User manual

Installation and Operation Manual
Thermo Scientific
Explosion-Proof
Refrigerators and Freezers

© 2015 Thermo Fisher Scientific. All rights reserved.

326805H01 Rev. D
Explosion-Proof Refrigerators
and Freezers
Model No:
20ERCETSA, 20EREETSA, 20EFEETSA
20EREETSV, 20EFEETSV, 20ERCETSV

Table of Contents
Safety Information.............................................................................................................................................. ..1
Alert Signals................................................................................................................................................ ..1
Intended Use ..................................................................................................................................................... ..3
Explosion Proof Refrigerators and Freezers.........................................................................................................4
Unpacking.......................................................................................................................................................... ..5
Visible Loss or Damage.................................................................................................................................5
Concealed Loss or Damage..........................................................................................................................5
Performance Characteristics................................................................................................................................6
Temperature Ranges.....................................................................................................................................6
Electrical Requirements............................................................................................................................... ..6
Installation.......................................................................................................................................................... ..7
Electrical...................................................................................................................................................... ..7
Be Advised................................................................................................................................................... ..7
Electrical Connection Check Points ...............................................................................................................8
Leveling the Unit.......................................................................................................................................... 12
Wiring.......................................................................................................................................................... 12
Electrical Connection................................................................................................................................... .13
Operation........................................................................................................................................................... 15
Initial Startup................................................................................................................................................ 15
Temperature Control....................................................................................................................................15
Condensate Disposal...................................................................................................................................15
Material Compatibility.................................................................................................................................. 15
Troubleshooting............................................................................................................................................... ...16
Maintenance..................................................................................................................................................... ..17
Cabinet Cleaning....................................................................................................................................... ..17
Condenser................................................................................................................................................. ..17
Warranty...............................................................................................................................................................18
Safety Tips................................................................................................................................................... 14
Explosion-Proof Refrigerator and Freezer Installation....................................................................................8
Selecting a Location......................................................................................................................................12
Shelves....................................................................................................................................................... .13
Door Seal.................................................................................................................................................... .14

Safety Information
Your satisfaction and safety are important to Thermo Scientific and a complete understanding of this unit is
necessary to attain these objectives.
As the ultimate user of this apparatus, it is your responsibility to understand its proper function and operational
characteristics. This instruction manual should be thoroughly read and all operators given adequate training
before attempting to place this unit in service. Awareness of the stated cautions and warnings, and compliance
with recommended operating parameters – together with maintenance requirements – are important for safe
and satisfactory operation. The unit should be used for its intended application; alterations or modifications will
void the Warranty.
This apparatus is designed for use in Class I, II or III locations as defined by the National Electrical Code, unless
otherwise noted.
Alert Signals
ON
OFF
Safety Alert
Important operating instructions. To reduce the risk of injury or poor
performance of the unit read the user manual before putting the
equipment into operation.
DANGER Indicates an immediately hazardous situation, which if not avoided,
will result in death or serious injury.
WARNING Indicates an immediately hazardous situation, which if not avoided,
will result in death or serious injury.
CAUTION Indicates an immediately hazardous situation, which if not avoided, may
result in minor to moderate injury.
CAUTION (Without Safety Alert Symbol) indicates a situation that may result in
property damage.
Shock Hazard
Use of this equipment involves power supplies which convert line voltage
to low voltage power. Do not modify or use power supplies other than
OEM equipment. Connection of the power supply may require a properly
grounded receptacle. Potential for electrical shock or equipment damage
exists if precautions are not followed.
Frost bite/ Low
Temperature
Avoid contact with cold freezer surfaces potential for cold burns or skin
sticking to cold surfaces.
1
(No Symbol)

DANGER RISK OF CHILD ENTRAPMENT Before you throw away your old refrigerator or
freezer:
•Take off doors.
• Leave the shelves in the place so that children may not easily climb inside.
If the equipment is used in a manner not specified by the manufacturer, the protection provided
by the equipment may be impaired.
2
Safety Information

Intended Use
The Refrigerators/Freezers described in this manual are for
professional use only. These products are intended for use in
research for the storage of samples or inventory in the
following temperature ranges:
+1°C to +12°C
3
WARNING
Only Explosion Proof Units or
Flammable Material Storage Units
are to be used for the storage of
flammable inventory/samples.
These are not considered medical devices and have therefore not
been registered with a medical device regulatory body (e.g. FDA):
that is, it has not been evaluated for the storage of samples for
diagnostic use or for samples to be re-introduced to the body.
Corrosive Materials Requiring Refrigerated or Frozen Storage
Refrigerators
Freezers
For 20EFEETSV
-12°C to -20°C
-18°C to -28°C
• Only use models rated as Corrosion Resistant.
•Corrosion Resistant does not mean Corrosion Proof – Care in storage
is still required.
• Store only corrosive reagents/samples which truly need
reduced temperature storage.
• Flammable corrosive materials require Flammable Material Storage or
Explosion Proof models labeled for the storage of corrosives.
•Containers must be wiped clean of moisture and chemical residue
before being introduced into the unit and upon return from use.
•Containers must be sealed with either vinyl tape or Parafilm ®.
•Reagents/samples which release HX (X= F, Cl, Br, I) on contact with
moisture (e.g. Acyl halides, Organosilyl halides etc.) are particularly
damaging to metals.
• Volatile amines will react with HX depositing salts which will
lead to corrosion of metal surfaces.
• Volatile organic acids can exacerbate metal surfaces already
compromised, be sure these are securely sealed.
•Refrigerated compartments are cool or cold areas but they are not to
dry seal your reagents and samples.
• Bleach solutions release chlorine gas which can react with
other volatiles in the cooling chamber or directly attacks metal surfaces.
• Periodically clean the interiors, clean up spills or leaking containers
• Failure to take precautionary actions may lead to damage not covered
by warranty claims.
Parafilm ® is a registered trademark of Bemis Company, Oshkosh, WI.

4
Explosion-Proof
Refrigerators and Freezers
Overview
Conventional refrigerators and freezers are not suitable for storing flammable
materials. Such units have components in their electrical and refrigeration
systems that can trigger explosions of flammable air-vapor mixtures inside the
unit and/or in the immediate surrounding area.
The Authority having Jurisdiction (AHJ) determines if work areas are
designated as a hazardous location with respect to the presence of flammable
gases or vapors. Such locations are defined in (National Fire Protection
Agency) NFPA 70 Articles 500-501 and OSHA 29 CFR1910.307. Some of
these classified areas are expected to experience concentrations of flammable
gases and/or vapors at or above their lower flammability limits for extended
periods of time.
The construction of our explosion-proof units has been evaluated by
Underwriters Laboratories (UL)1 are suitable for use in classified areas
requiring Class I, Groups C and D* protected equipment. The electrical
components such as thermostats, wiring, splices, relays and compressor
motors on explosion-proof units are safely housed within explosion-proof
enclosures and conduit. Compressor surface temperatures have been
evaluated and determined to remain below the flash point of materials found in
Class I, Groups C and D. All models have heavy-gauge, rigid, steel
construction with a durable enamel finish. Interiors have epoxy coated steel
construction. Each unit is insulated throughout for energy-efficient operation.
These units are ideal for storing ethyl ether, acetone, alcohol, benzene,
gasoline, hexane, lacquer solvent vapors, naphtha, along with many other
potentially hazardous materials.
WARNING: For FMS and EXP units where flammable materials are stored in
the cooling chamber, the cooling chamber is considered a Class I Div1 or Class
I Zone 1 hazardous location. Any monitoring devices placed in the cooling
chamber must have an intrinsically safe rating from an appropriate certification
body, such as UL, CSA, FM etc. (this includes battery or solar powered
devices).
Thermocouples for building monitoring systems must be wired through an
electrical barrier designed to provide isolation against voltage and current
spikes, which could cause a spark resulting in fire or explosion. It is the end
user's responsibility to meet these requirements. Thermo Fisher Scientific
cannot assist with the selection of devices, recommend, approve or design any
device or monitoring circuit.
*The notation Class 1, Groups C and D is an accepted abbreviation for Class 1
Div 1, Groups C and D; Class I Zone 1 Group IIB.
1 20xxxxTSV models are not evaluated or certified by UL.

Unpacking
Save all packing material if apparatus is received damaged.
This merchandise was carefully packed and thoroughly
inspected before leaving our factory.
Responsibility for its safe delivery was assumed by the carrier
upon acceptance of the shipment; therefore, claims for loss or
damage sustained in transit must be made upon the carrier by
the recipient as follows:
Visible Loss or Damage
Note any external evidence of loss or damage on the freight
bill, or express receipt, and have it signed by the carrierʼs
agent. Failure to adequately describe such external evidence
of loss or damage may result in the carrierʼs refusing to honor
your damage claim. The form required to file such a claim will
be supplied by the carrier.
Concealed Loss or Damage
Concealed loss or damage refers to loss or damage, which
does not become apparent until the merchandise has been
unpacked and inspected. Should either occur, make a written
request for the carrierʼs agent within 15 days of the delivery
date; then file a claim with the carrier since the damage is the
carrierʼs responsibility.
If you follow the above instructions carefully, we will guarantee
our full support of your claim to be compensated for loss from
concealed damage.
DO NOT – FOR ANY REASON – RETURN THIS UNIT
WITHOUT FIRST OBTAINING AUTHORIZATION.
5

Performance Characteristics
Temperature Ranges
Freezer: -12° to -20°C (-4° to 10°F)
6
For 20EFEETSV: -18° to -28°C (-0.4° to -18.4°F)
Refrigerator: 1° to 12°C (34° to 54°F)
Electrical Requirements
For 20ERCETSA, 20EREETSA and 20EFEETSA
115 Volts ±10%, 60 Hz, 5.0 Amps
For 20EREETSV, 20EFEETSV and 20ERCETSV
230 Volts ±10%, 50 Hz, 2.0 Amps

INSTALLATION
Electrical
Flammable Material Storage and General Purpose units must
be connected to a grounded outlet matching the nameplate
and / or the information furnished in this manual. If you are not
sure about the outlet, you should contact a qualified electrician
for assistance. Explosion-Proof units must be hardwired by a
qualified electrician.
Explosion-Proof unit should always be connected to a
dedicated power source.
Be Advised
7
WARNING
UNLESS UNIT IS SPECIFICALLY DESIGNED FOR
COMBUSTIBLE OR FLAMMABLE ATMOSPHERES
DO NOT USE IN THE PRESENCE OF FLAMMABLE
OR COMBUSTIBLE MATERIALS OR EXPLOSIVE
GASES. DO NOT USE IN THE PRESENCE OF
PRESSURIZED OR SEALED CONTAINERS— FIRE
OR EXPLOSION MAY RESULT CAUSING DEATH.
CAUTION
BEFORE CONNECTING THE FINAL POWER
SUPPLY, CHECK THE ELECTRICAL
CHARACTERISTICS OF THE UNIT NAMEPLATE
TO SEE THAT IT IS IN AGREEMENT WITH THE
POWER SUPPLIED. IN ADDITION, POWER
SHOULD BE WIRED TO THE UNIT ACCORDING
TO THE ELECTRICAL SCHEMATIC AND ALL
APPLICABLE CODES. ONLY QUALIFIED
ELECTRICIANS SHOULD WORK ON THE
ELECTRICAL PORTION OF ANY UNIT
INSTALLATION.
CAUTION
STORAGE BY USER OF ANY MATERIALS IN THE
PRODUCT THAT MAY CAUSE A DETERIORATION
OF THE PRODUCT SHALL BE DEEMED TO
CONSTITUTE ABNORMAL AND IMPROPER
USAGE OF THE PRODUCT FOR PURPOSES OF
THIS WARRANTY.
WARNING
RISK OF CHILD ENTRAPMENT Before you discard
your old refrigerator or freezer:
• Remove door(s).
• Leave the shelves in place so that children may not
easily climb inside.
CAUTION
DO NOT REMOVE, under any
circumstance, the grounding
prongs from the 3-prong power
cord supplied with all units.
CAUTION
DO NOT USE electrical extension
cords that may result in voltage loss
and possible hazardous operation.
WARNING
Explosion-proof units do not come
with line cords. They require rigid
conduit to be run directly in order to
seal off the fitting on thermostat
housing. This should be done by a
licensed electrician and follow all
local electrical codes. If any
questions pertaining to electrical
safety arise, please refer to article
501 of the National Electrical Code.

Installation
Explosion-Proof Refrigerator and Freezer
Installation
IMPORTANT: PLEASE READ CAREFULLY
This unit is for free standing installation only. The appropriate materials and
wiring methods must be used in order to comply with current NFPA No. 70
NEC. for Class I, Group C and Group D; Class I Zone 1 Group IIB Hazardous
Locations and Local Codes.
Determine the total amount of current presently being used by other apparatus
connected to the circuit that will be used by this unit. It is critical that this added
current must not exceed the rating of the fuse or circuit breaker in use.
The Explosion-Proof Refrigerator/Freezer is supplied with a special junction
box located on the rear of the unit.
The National Electrical Code (NEC) must be referred to for proper fusing and
service conductor size and type.
Power to the unit must be supplied using permanent wire connections, as a
line cord is not provided. The service conductors should be connected to the
three conductors inside the junction box by a qualified electrician.
The refrigerator/freezer must be connected to a single phase system with
ground. The circuit live is connected to the refrigerator/freezer black while the
white connects to the system neutral and green/yellow conductor is grounded.
Screw type cover
Connect Black to system live GREEN/YELL
Connect White to system
neutral
After all connections are made, carefully fold up the conductors inside the
junction box and thread the lid onto it.
Electric Connection Check Points
•Have proper connections been made at the junction box?
•Is the junction box lid fastened tightly to the junction box?
•Are all wire connections secure?
•Are the service conductor sizes adequate to carry rated load?
•Is the unit properly grounded?
•Is the unit connected to a properly fused branch circuit?
ϴ

•Turn power off at the circuit breaker before proceeding.
•Place a small amount of sealing compound granules, enclosed, into a
clean mixing vessel. Add small amounts of water while stirring until a
thick paste is formed, then carefully continue adding smaller amounts
of water until a thick gravy consistency is achieved—NOT WATERY.
Discard any material that becomes too stiff to use. Never attempt to
restore workability by stirring in more water.
•Locate silver Killark box, back/top-center of unit.
•Unscrew conduit domed-cover.
Note: KILLARK ® is a registered trademark of Hubbell Incorporated,
Shelton, CT, USA.
ϵ
Installation
How to Seal Killark® Box Conduit with Fiber and Sealing Compound
to Help Protect Against Explosions (Explosion-Proof Units Only):
The purpose of the procedure that follows is to build fiber rope dams on
the left and right hubs of the horizontal conduit. The fiber rope dams will
surround conduit wiring that is housed inside the horizontal conduit. When
both the left and right fiber rope dams have been pressed into place,
sealing compound is poured between the two and forms into an airtight
plug. All of this is done in order to prevent the very real threat of gas
entering the Killark box and a resulting serious explosion.
After the unit wires have been pulled through the horizontal conduit the
following procedure is required:
Fi g ure 1: Sealing the Killark Box

Note: Wires must be kept separated as shown in the diagrams.
Figure 2: Horizontal Conduit, Cutaway
•Insert fiber rope material down into horizontal conduit opening. Pressing down firmly, work the material
into the left hub and—most importantly—being sure the material COMPLETELYSURROUNDS THE
WIRING, from the top to the bottom, completely blocking this end of the horizontal conduit.
•Insert fiber rope material down into horizontal conduit opening. Pressing down firmly, work the material
into the right hub and—most importantly—being sure the material COMPLETELYSURROUNDS THE
WIRING, from the top to the bottom, completely blocking this end of the horizontal conduit.
ϭϬ
Installation

•Pour sealing compound down in between the two fiber rope dams filling the remaining space. Pour
slowly, being careful not to trap air bubbles. Immediately wipe off any spilled sealing compound.
•Screw conduit domed-cover back onto conduit opening.
NOTE: INITIAL SETUP OF SEALING COMPOUND WILL OCCUR IN APPROXIMATELY 30 MINUTES
HOWEVER, THE SEALING COMPOUND REQUIRES A MINIMUM OF 8 HOURS ABOVE 32ºF TO
DEVELOP SUFFICIENT STRENGTH TO WITHSTAND EXPLOSIONS.
Note: Wires must be kept separated as shown in the diagram before addition of the sealing compound.
1ϭ
Installation

CAUTION
Be sure that the power supply is
the same voltage that is specified
on the unitʼs data plate.
WARNING
For personal safety this unit must
be properly grounded.
Installation
1Ϯ
Selecting a Location
Choose a location for the refrigerator/freezer that will provide a
clearance of 4 in. at the top, 8 in. at the rear and 3 in. at each
side.
Appropriate electrical power must be available. Locate the
refrigerator/freezer within eight feet of the power outlet so that
no extension cord is required. Attach the refrigerator/freezer to
the facility’s electrical supply as directed by the
National Electrical code Article 440.
Figure 3. NEMA Plugs and Receptacles
Leveling the Unit
The refrigerator/freezer must be level in order to provide
adequate condensate drainage as well as proper door
alignment and operation. The refrigerator/freezer should be in
its final operating location and set so that it is firmly positioned
on the floor.
Locate the two front leveling legs taped among the packing
materials. Screw these legs into the front holes on the bottom
of the freezer. The back of the refrigerator/freezer rests on two
fixed supports. Adjust the front legs enough to lift the cabinet
up off of the floor. Place a leveling tool on top of the
refrigerator/freezer first side to side, then front to back. Turn leg
counter clockwise to raise a corner.
Wiring
General purpose units use 15 or 20 amp power cords. They are
rated for 115 volts, AC, 60 Hz. Do not use extension cords, and
always use a three prong grounded wall outlet. Figure 3 shows
standard NE service cord plugs and wall outlets used for our
refrigerators and freezers.

13
WARNING
DO NOT under any
circumstances cut or remove the
third (ground) prong from the
power cord. DO NOT use a two-
prong adapter plug. Where a two-
prong wall receptacle is
encountered, it is the personal
responsibility and obligation of
the user to have it replaced with a
properly grounded three-prong
receptacle.
Installation
CAUTION
Do not use an extension cord.
Use of an ungrounded cord or
an over-loaded circuit VOIDS the
compressor warranty.
Electrical Connection
Determine the total amount of current presently being used by
other apparatus connected to the circuit that will be used by
this refrigerator. It is critical that this added current demand and
other equipment on this circuit not exceed the rating of the fuse
or circuit breaker in use. The frequency and nominal voltage
requirements for the unit are specified on the data plate, which
is located on the interiors upper left side. Only plug the unit into
a power source that meets these requirements. Low line
voltage is often the cause of service complaints. With the unit
running, check that the line voltage is within ±10% of that
specified on the data plate.
The power cord on this product is equipped with a three-prong
(grounding plug appropriate for the voltage, current, and
location for which it was designed. The plug will mate with a
standard grounding outlet of the corresponding configuration to
minimize the potential of an electrical shock hazard. It is the
customerʼs responsibility to have the wall receptacle and
supply circuit checked by a qualified electrician to verify that
they are appropriate for the power requirements of the product,
that they match the supplied plug, and that they are properly
grounded and have over-current protection.
Shelves
Shipped inside each cabinet are four fixed shelves which also
serve as part of the evaporator coil on freezer models. For the
refrigerator models, out of the four shelves, one shelf is a sheet
metal shelf & others are wired shelves are fixed. For Corrosion
resistant models all shelves are steel shelves.

14
Installation
Safety Tips
•After a unit is in operation, do not touch the cold surfaces,
particularly when hands are damp. Skin may adhere to the
cold surfaces.
We recommend handling samples by wearing gloves to
avoid frost bite.
•Never disconnect your unit by pulling on the power cord.
Always grip the plug securely and pull straight out from the
outlet.
•Do not use a power cord that shows cracks or abrasions.
Have a qualified electrician repair or replace damaged cords
immediately.
Door Seal
To check the door seal, complete the steps:
1. Open the door.
2. Insert a strip of paper (a couple of inches wide) between
the door gasket and the cabinet flange and close the door.
3. Slowly pull the paper strip from the outside. You should
feel some resistance.
4. Repeat this test at 4 inch intervals around the door. If the
door does not seal properly, replace the gasket.

Operation
15
WARNING
If the unit is tilted in excess of
30 degrees, do not apply
electrical power for a minimum
of 12 hours.
WARNING
Do not heat any substance
above a temperature which will
cause it to emit toxic fumes—
death or severe injury may
result.
Initial Startup
This unit is not equipped with a power switch. Turn the
applicable facility circuit breaker off during installation. Simply
turn power on the facility’s circuit that supplies the unit.
Temperature Control
To adjust the interior temperature down, simply turn the
thermostat knob clockwise. For operation above an altitude
of 3000 ft., have the thermostat adjusted by a technician.
Condensate Disposal
For EF models
The condensate drain is at the centre rear of the interior floor.
The condensate drain tube is connected to this drain and is
attached to the left front bottom of the unit behind the front
sheet metal. Unhook and place the drain tube into a suitable
pan and remove the drain plug. Turn the power to the unit to
the off position (O) and allow the unit to defrost.
For ER models
Equipped with a drain pan that collects condensate during
manual defrost. This drain pan takes advantage of the heat
generated by the compressor to evaporate condensate water,
so there is no need to empty the pan during each defrost cycle.
Material Compatibility
The interior cabinet of this unit is constructed of epoxy-
coated steel. Care must be exercised when determining which
chemicals may be stored in the refrigerator and freezer sections
and which type of storage materials should be employed.
ABS Plastic deteriorates when exposed to, but not limited
to, the following:
Aliphatic Hydrocarbons; Aromatic Hydrocarbons; Fully
and Partially Halogenated Hydrocarbons; Alcohols Monohydric;
Phenols; Ketones; Esters; Ethers; Organic
Acids (concentrates and dilute); and Concentrated
Oxidizing Acids. This information is taken from Plastics Edition
8 Thermoplastics and Thermosets published by
D.A.T.A. and The International Plastics Selector, Inc.
Cordura Companies
9889 Willow Creek Road P.O. Box 26637
San Diego, California 92126.

Troubleshooting
This table is intended to assist in resolving user-correctable refrigerator problems by relating symptoms to
their likely causes. If service beyond the scope of this table is required, contact Customer Service at
1-800-438-4851.
Symptom Probable Cause Action
Does Not Run Unit Unplugged
Blown fuse or tripped circuit Breaker
Plug in
Check fuse or circuit breaker at
breaker box
Runs Continuously Frost buildup on refrigeration coils Defrost unit
Clicking Sound The compressor is equipped with a thermal
protector. This device shuts off the compressor
when it becomes too hot. A clicking sound
occurring about every 30 seconds indicates this
protector is working
Unplug unit for 1 hr. Plug in and try
running again. If the unit doesnʼt
begin to run, call for service.
Insufficient Cooling Thermostat set too high
Unit frosted
Reduce thermostat setting
Defrost unit
16