Thermo Scientific DLT, SLT, ELT Installation & Operating Manual
Installation and Operation Manual
Thermo Scientific Harris® D LT, S LT, a n d E LT
Ultra-Low Temperature Freezers
©
2007 Thermo Fisher Scientific. All rights reserved.
“Suva®” is a registered trademark of DuPont.
Armaflex® is a registered trademark of Armacell International GmBH.
All other trademarks are the property of Thermo Fisher Scientific Inc. and its subsidiaries.
2007 Thermo Fisher Scientific. All rights reserved.
“Suva®” is a registered trademark of DuPont.
All other trademarks are the property of Thermo Fisher Scientific Inc. and
its subsidiaries.
Thermo Scientific Harris Ultra-Low Temperature Freezers Installation and Operation
Table of Contents
1 Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 General Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2.1 Initial Operation and Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
3 Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.1 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.3 Voltage Safeguard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.4 Leveling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.5 Door Operation (Upright Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.5.1 Locking the Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.5.2 Unlocking the Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.5.3 Opening the Door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
4.6 Compressor Mounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
4.7 Pressure Equalization Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
5 Operation (Harris DLT and SLT Series Freezers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5.1 Control Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
5.2 Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5.2.1 Turning the Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5.2.2 Setting the Cabinet Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5.2.3 Setting the Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5.2.4 Alarm Reset & Status Lights (Harris DLT and SLT Series Freezers) . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
5.2.5 Alarm Test (Harris DLT and SLT Series Freezers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6 Backup System (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
6.1 CO2 and LN2 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6.2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
6.4 System Status Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
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Thermo Scientific Harris Ultra-Low Temperature Freezers Installation and Operation
7 Operation (Harris ELT Freezers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.1 Control Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
7.2 Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
7.2.1 Turning the Power On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
7.2.2 Setting the Cabinet Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
7.2.3 Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
8 Maintenance and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
8.1 Condenser Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
8.1.1 Cleaning the Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
8.1.2 Cleaning the Condenser Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
8.2 Gasket Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.3 Defrosting the Freezer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
8.4 Alarm Battery Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
8.5 Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
9 Optional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
9.1 Backup Protection Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.1.1 Liquid Nitrogen (LN2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.1.2 Liquid CO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.2 Circular Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.3 Remote Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
10 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
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Thermo Scientific Harris Ultra-Low Temperature Freezers Installation and Operation
1 Safety Considerations
WARNING! Do not modify or change system
components. Replacement parts must be O.E.M.
exact replacement equipment. Modification or use of
the equipment in a manner other than expressly
intended may cause death or serious injury. This
includes use of user-supplied components and
materials not specifically designed for the unit.
Reconfiguring the controller may cause death or
serious injury.
The manufacturer shall not be liable for any damages,
including incidental and/or consequential damages,
regardless of the legal theory asserted, including
negligence and/or strict liability.
Before using, user shall determine the suitability and
integrity of the product for the intended use and that
the unit has not been altered in any way. User
assumes all risk and liability whatsoever therewith.
WARNING! For personal safety and trouble-free
operation, this unit must be properly grounded before
it is used. Failure to ground the equipment may cause
personal injury or damage to the equipment. Always
conform to the National Electrical Code and local
codes. Do not connect unit to already overloaded
power lines.
WARNING! Disconnect unit from main power
before attempting any maintenance to equipment or
controls.
WARNING! This freezer operates at extremely
low temperatures. Do not work inside the cabinet
without proper covering for your hands and arms.
Even brief exposure at ultra-low temperatures can
damage your skin.
2 General Recommendations
The refrigeration system is designed to maintain ultra-low
temperatures with safety in a +32°C (90°F) ambient
environment, only when the freezer is used for storage.
2.1 Initial Operation and Loading
After reading and completing the Safety Considerations,
Pre-Installation, Installation, and Operation sections of this
manual, turn the Key Switch to the POWER ON position and
adjust the temperature setpoint if necessary.
The setpoint should be no warmer than -50ºC for two-stage
freezers or -10ºC for single-stage freezers. Allow the freezer to
operate at the desired temperature for a minimum of 12
hours before loading.
Load the freezer one shelf at a time, beginning with the top shelf.
After loading each shelf, allow the freezer to recover to the
desired setpoint before loading the next shelf. Repeat this process
until the freezer is fully loaded.
CAUTION! Failure to follow these procedures or
overloading the unit may cause undue stress on the
compressors or jeopardize user product safety.
3 Pre-Installation
3.1 Unpacking
At delivery, examine the exterior for physical damage while the
carrier’s representative is present. If exterior damage is
present, carefully unpack and inspect the unit and all
accessories for damage.
If there is no exterior damage, unpack and inspect the
equipment within five days of delivery. If you find any damage,
keep the packing materials and immediately report the damage
to the carrier. Do not return goods without written
authorization. When submitting a claim for shipping damage,
request that the carrier inspect the shipping container and
equipment.
Note: Note:Do not discard the sublids from chest-style
units.
The sublids are necessary to maintain correct
temperature, moisture control, and economy of
operation. Upright models do not include sublids
because they have built-in ABS plastic inner doors.
WARNING! This unit is not a “rapid-freeze” device.
Freezing large quantities of liquid, or high-water
content items, will temporarily increase the chamber
temperature and will cause the compressors to
operate for a prolonged time period. Attempting to
utilize this freezer improperly may jeopardize user
product safety or cause undue stress or damage to
the refrigeration compressors.
Avoid opening the door for extended time periods since chamber
temperature air will escape rapidly. Room air, which is higher in
humidity, replacing chamber air may cause frost to develop in the
chamber more rapidly.
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Thermo Scientific Harris Ultra-Low Temperature Freezers Installation and Operation
15A-125V
NEMA 5-15P
20A-125V
NEMA 5-20P
15A-250V
NEMA 6-15P
20A-250V
NEMA 6-20P
30A-250V
NEMA 6-30P
4 Installation
Do not exceed the electrical and temperature ratings printed on
the dataplate located on the lower left side of the unit.
CAUTION! Improper operation of the equipment
could result in dangerous conditions. To preclude
hazard and minimize risk, follow all instructions and
operate within the design limits noted on the dataplate.
4.1 Location
Install the unit in a level area free from vibration with a minimum
of six inches of space on the sides, rear, and top. Refer to
Section 4.4 for further instructions on leveling cabinets. Allow
enough clearance so that door or lid can swing open at least
90 degrees.
Do not position the equipment in direct sunlight or near heating
diffusers, radiators, or other sources of heat. The ambient
temperature range at the location must be 59 to 90°F
(15to32°C).
CAUTION! To allow for proper air flow, a minimum
of six inches of clearance space is required behind the
freezer.
4.2 Wiring
CAUTION! Connect the equipment to the correct
power source. Incorrect voltage can result in severe
damage to the equipment.
DANGER! For personal safety and trouble-free
operation, this unit must be properly grounded before
it is used. Failure to ground the equipment may cause
personal injury or damage to the equipment. Always
conform to the National Electrical Code and local
codes. Do not connect the unit to overloaded power
lines.
Your freezer is equipped with one of five NEMA style plugs
(refer to Figure 1). These plugs meet UL requirements.
CAUTION! Never cut the grounding prong from the
service cord plug. If the prong is removed, the
warranty is invalidated.
4.3 Voltage Safeguard
Freezers are equipped with a standard built-in Voltage Safeguard
circuit to detect and adjust low line voltage.
The Voltage Safeguard helps protect electrical equipment from
damage by boosting low voltage automatically. On Harris DLT
and SLT models a panel light flashes to indicate when deficient
line voltage is being corrected (see Figure 3 on page 4).
4.4 Leveling
The unit must be level both front to back and side to side.
To level chest models, leave the casters in place and shim the low
wheel(s) with strips of sheet metal cut at least 1/2 in. wider than
the caster.
Upright models have adjustable leveling feet which are located
adjacent to the front casters.
4.5 Door Operation (Upright Models)
Upright freezer models are equipped with a special handle cam
assembly which provides ease in opening and closing operations.
4.5.1 Locking the Door
1. Close the freezer door and place the handle in a vertical
position.
2. Insert the key horizontally into the lock.
3. Push the key and lock assembly into the handle
approximately 0.25 inch and turn the key clockwise 90
degrees.
4. Continue to depress the key and turn it counterclockwise
back to the starting position. The lock assembly should
remain depressed inside the handle.
5. Remove the key.
4.5.2 Unlocking the Door
1. Insert the key horizontally into the lock.
2. Turn the key 90 degrees clockwise. The lock assembly
automatically springs out until its face is outside the outer
handle casting).
3. Turn the key back to horizontal (counterclockwise
90 degrees) and remove the key.
Figure 1. NEMA Style Plugs
Always connect the freezer to a dedicated (separate) circuit. Each
freezer is equipped with a service cord and plug designed to
connect it to a power outlet which delivers the correct voltage.
Supply voltage must be within +10%, -5% of the freezer rated
voltage.
4.5.3 Opening the Door
1. The door must be unlocked (the face of the lock is flush with
the outer handle casting and not indented into the casting).
2. Grab the upper handle on the front of the freezer and pull it
toward you while rotating it 90 degrees until the handle rests
on the built-in stop.
3. Use the vertical door handle mounted on the left front corner
of the door to pull the freezer door fully open.
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Thermo Scientific Harris Ultra-Low Temperature Freezers Installation and Operation
Spring
4.6 Compressor Mounts
Some Harris DLTs are shipped with the compressor mounts
secured. The springs under the compressor mounting feet are
fully compressed by hold-down nuts for shipping. These nuts
must be loosened before the unit is put into operation (refer to
Figure 2).
To loosen the compressor mount springs, complete the following
steps:
1. Remove the end panel on the right side of the machine
compartment to expose the compressor.
2. Use a 3/4 in. box end or socket wrench with ratcheting handle
and a 4 in. extension to loosen the nuts on the compressor
mounts (refer to Figure 2). Loosen the nuts until the
clearance between the bottom of the nut and the top of the
mounting foot is 1/8 in.
3. Inspect the area under each mounting foot for spacer clips.
Any clips must be removed before compressor operation.
4.7 Pressure Equalization Port
When an upright ultra-low temperature freezer door is opened,
room temperature air rushes into the storage compartment.
When the door is closed, the fixed volume of air is cooled rapidly.
Pressure drops below atmospheric pressure, resulting in a
substantial vacuum. Re-entry into the cabinet is impossible until
internal pressures are returned to atmospheric pressure. Without a
pressure equalization mechanism, it can take several minutes
before the door can easily be reopened.
All upright models feature a port that provides vacuum relief
after door openings.
The pressure equalization port is located in the bottom left side of
the storage chamber. Although the port is designed to selfdefrost, excessive frost accumulation in the bottom of the
chamber could eventually restrict air flow. Therefore you should
periodically inspect the port and brush away any loose frost using
a stiff nylon brush.
WARNING! To ensure proper operation, be sure not
to obstruct the port. Push any storage racks near the
port all the way to the rear of the cabinet.
WARNING! When the freezer is in operation, avoid
touching the lower left side of the cabinet exterior near
the “hot surface” warning label. The port can get hot
immediately after it is activated.
Figure 2. Compressor Mount Springs
Note: Some of the Harris DLT freezers require loosening the
compressor bolts. This is not necessary for all models.
3
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