Thermo Scientific RLE40086A, RLE30086D, RLE30086A, RLE60086D, RLE50086A Instruction Manual

Ultra Low Temperature Freezers

Water Cooled Option

Installation and Operation

324003H02 • Revision A • September 2017

IMPORTANT Read this instruction manual. Failure to follow the instructions in this manual can result in
damage to the unit, injury to operating personnel, and poor equipment performance.

CAUTION All internal adjustments and maintenance must be performed by qualified service personnel.

Material in this manual is for informational purposes only. The contents and the product it describes are
subject to change without notice. Thermo Fisher Scientific makes no representations or warranties with
respect to this manual. In no event shall Thermo be held liable for any damages, direct or incidental, arising
from or related to the use of this manual.

© 2017 Thermo Fisher Scientific Inc. All rights reserved.

Contents

Introduction ................................................................. 1

Unpacking ................................................................... 2

Operating Requirements .............................................. 3

Water Flow Rate....................................................... 3

Water Pressure ........................................................ 3

Water Temperature Range ....................................... 3

Water Quality ........................................................... 3

Water Drainage ........................................................ 3

Monitoring Equipment .............................................. 3

Installation.................................................................... 4

Clearance................................................................. 4

Water Connections .................................................. 4

Operation..................................................................... 5

Maintenance ................................................................ 6

Cleaning the Water-Cooled Condenser .................... 6

Replacing the Water Supply Line Strainer................. 6

Introduction

This manual describes installation and maintenance
procedures for water cooling connections for Thermo
Scientific Ultra-Low Temperature Freezers.

CAUTION: Be sure to read these instructions
carefully before installing and using the water
connections, and be sure to read the Ultra-Low
Freezer Installation and Operation Manual before
operating the freezer.

Use this product only in the way described in the product
literature and in the user manuals. Before using it, verify that
this product is suitable for the users intended application.

Ultra Low Temperature Freezers Introduction | 1

Unpacking

Upon unpacking, make sure that all specified water line
fittings are included with the unit:

• 1/2" MNPT x 3/8" MNPT fitting (Quantity 2)

• 1/2" FNPT x 1/2" MBSPT adapter (Quantity 2)

Figure 1. 1/2" MNPT x 3/8" MNPT

Figure 2. 1/2" FNPT x 1/2" MBSPT

The 3/8" MNPT goes into the freezer at both the inlet and the
outlet.

2 | Unpacking Ultra Low Temperature Freezers

Operating Requirements

Water Flow Rate

The minimum water flow rate is 0.5 GPM (gallons per minute)
if temperature of the water is less than 25°C and 1 GPM if
temperature of the water is above 25°C.

Water Pressure

The water pressure should not exceed 90 psi or 620.5 kpa.
Note: This limit is not to be exceeded even though the

components may be rated up to 150 psi.

Water Temperature Range

+12.0°C to +30.0°C (+53.6°F to +86°F)

Water Quality

Monitoring Equipment

To verify operating requirements, you will need:

• A flowmeter capable of measuring up to at least

5.3 gallons (20 liters) per minute to measure flow rates at
the water return line labeled PROCESS OUTLET.

• A pressure gauge ranging from 0 to 300 psig to measure
pressure at the water inlet labeled PROCESS INLET.

Water must be free of particulates, which could cause a
blockage or impair function of the regulating valve or heat
exchanger. The pH level of water must be between 7.0 and

8.0. The optimum pH level is 7.4.
Use a suitable inline strainer in the inlet pipe to minimize

particulates in the water supply. We recommend a strainer
with a screen between 16 to 20 mesh, preferably stainless
steel or brass. When the strainer is installed, water flow rate
must still exceed the minimum water flow rates described in
the Water Flow Rate section.

Water Drainage

If the water return line labeled PROCESS OUTLET is not
connected to a closed loop chiller system, connect the return
line water to a reservoir tank or drain. This will hold/dispose of
the water from the unit to avoid flooding.

Ultra Low Temperature Freezers Operating Requirements | 3

Installation

Clearance

Before installing the water connections, be sure that the unit is
positioned with an extra 2" (5 cm) of clearance in back to
leave room for a hose.

This is in addition to the 6" (15 cm) back clearance
recommended in the main user manual.

Water Connections

To install the water connections:

1. Uncap the PROCESS INLET/PROCESS OUTLET fittings
on the freezer.

Figure 3. Water line connections on the freezer

2. Check fittings and remove any particles and/or debris.

3. Finger tighten the fittings, then turn 1/8 to 1/4 turn with
an adjustable wrench.

Note: Thread sealant or Teflon tape is highly
recommended for use on threaded fittings.

4. Check for leaks; if found, repeat the 1/8 turn to 1/4 turn
until the leaks stop. Do not overtighten.

Figure 4. Fittings installed on freezer

5. Make sure the water line is clear from blockage and
debris.

6. Install a strainer with a 16-20 mesh screen to the
water-line PROCESS INLET.

7. Connect the incoming water supply line to the PROCESS
INLET fitting.

8. Connect the water return/drain line to the PROCESS
OUTLET fitting.

9. Adjust to specified operating standards (pressures,
temperature).

10. Turn on the water flow to unit.

11. Check for any leakage.

12. Refer to the user manual for further startup instructions.

Make sure that you have read the main user manual
carefully before starting up the freezer.

13. Adjust the water flow rate. Note that water will not flow
through the outlet until after the first stage compressor is
running.

Note: Except for maintenance tasks described in the
following section, do not turn on the freezer without water
connected and flowing. You will not see water flowing through
PROCESS OUTLET until after the first stage compressor is
running.

4 | Installation Ultra Low Temperature Freezers

Operation

Refer to the main ultra-low freezer user manual for all details
about operation, parameter settings, general maintenance,
user access, and troubleshooting.

Ultra Low Temperature Freezers Operation | 5

Maintenance

The maintenance tasks described in this section should only
be performed by qualified personnel.

Cleaning the Water­Cooled Condenser

Cleaning solutions can be used, depending on the type of
deposits or build-up to be removed. Do not use liquids that
are corrosive to stainless steel or the brazing material (copper
or nickel).

The condenser should be cleaned at least once a year, more
frequently when the environmental conditions are relatively
high in particulates.

CAUTION: Do not use products containing
hydrochloric acid or muriatic acid.

CAUTION: Cleaning solutions can be irritating to
exposed skin. Take precautions as
recommended by the manufacturer.

12. Reconnect the water supply and fill the unit.

13. Return to service.

Replacing the Water Supply Line Strainer

Recommended frequency of replacement depends on the
operating conditions. If the water line being fed is clean, then
the strainer should be replaced approximately every three
months.

To clean the condenser:

1. Remove product from cabinet.

2. Disconnect the unit from the water supply.

3. Drain the unit by leaving it turned on until all of the water
is out of the system, then turning the unit off
immediately.

4. Hook up the water lines, turn on the unit, and rinse with
fresh water.

5. Drain the unit again and turn it off.

6. Fill with fresh water and start the unit with water flowing.

7. Add cleaning agent to the water supply line labeled
“PROCESS INLET”. Choose the solution and
concentration depending on the amount of deposits or
build-up.

8. Circulate the cleaning solution.

9. Drain the cleaning solution.

10. Add and circulate a passivating liquid (phosphoric acid
5% or oxalic acid) for corrosion inhibition of plate
surfaces. Drain this liquid.

11. Rinse with clear water and drain.

6 | Maintenance Ultra Low Temperature Freezers

WEEE Compliance

Great Britain

Deutschland

Italia

France

WEEE Compliance. This product is required to comply with the European Union’s Waste Electrical &

Electronic Equipment (WEEE) Directive 2012/19/EU. It is marked with the following symbol. Thermo
Fisher Scientific has contracted with one or more recycling/disposal companies in each EU Member
State, and this product should be disposed of or recycled through them. Further information on our
compliance with these Directives, the recyclers in your country, and information on Thermo Scientific
products which may assist the detection of substances subject to the RoHS Directive are available at
www.thermofisher.com under Services & Support.

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Richtlinie 2012/19/EU erfüllen. Das Produkt ist durch folgendes Symbol gekennzeichnet. Thermo
Fisher Scientific hat Vereinbarungen getroffen mit Verwertungs-/Entsorgungsanlagen in allen EU-Mit­gliederstaaten und dieses Produkt muss durch diese Firmen widerverwetet oder entsorgt werden.
Mehr Informationen über die Einhaltung dieser Anweisungen durch Thermo Scientific, dieVerwerter
und Hinweise die Ihnen nützlich sein können, die Thermo Fisher Scientific Produkte zu identizfizieren,
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in merito ai Rifiuti degli Apparecchi Elettrici ed Elettronici (WEEE). È marcato col seguente simbolo.
Thermo Fischer Scientific ha stipulato contratti con una o diverse società di riciclaggio/smaltimento in
ognuno degli Stati Membri Europei. Questo prodotto verrà smaltito o riciclato tramite queste medes­ime. Ulteriori informazioni sulla conformità di Thermo Fisher Scientific con queste Direttive, l’elenco
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cold storage accessories, including remote alarms, temperature recorders, and validation services.
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Thermo Fisher Scientific and its subsidiaries unless otherwise specified. 324003H02 0917