Specifications
Description | Ultra Low Temperature Storage Freezer | ||
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Model Description | |||
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Exterior wall material | Coated cold rolled steel |
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Interior wall material | Coated zine cold rolled steel | ||
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Inner doors | Aluminum framed PS board | ||
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Shelves | Adjustable stainless shelves | ||
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Porthole for testing | 25.8 mm diameter X 1 Located on back wall | ||
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Insulation | Vacuum insulated with polyurethane | ||
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Compressors | High stage/Low stage: hermetically sealed | ||
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Evaporator | Copper tube |
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Condenser | High stage: Finned coil | Low stage: tube in tube heat exchanger | |
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Refrigerant | R134a R404a R290 | R23 | |
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Temperature controller | Microprocessor controller |
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Temperature display | Digital display |
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Temperature sensor | RTD Pt 100 ohms |
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Alarm device | High temperature alarm, low temperature alarm, power outage alarm, ambient | ||
temperature alarm, dirty condenser alarm, battery alarm, voltage alarm | |||
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Remote alarm | Maximum load is 24 VDC at 1A | ||
terminals | |||
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Battery | Rechargeable 12 VDC, automatically rechargeable | ||
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Accessory | Defrost scraper |
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Note: design parameters may vary. No further notice is available.
Technical data
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Note: At 25
ambient, the unit's maximum cold temperature can reach 
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Packing list
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| Key | / | / | / | 2 | 2 | / | |||
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18
Pre-Installation Information
When a ULT unit has been placed in storage or out of service for a long time, its battery should be tested for low capacity because the battery may have already released all of its energy. It does not mean the unit is in a malfunctioning condition. Should this condition occur, please run the unit for about 6 days to fully charge up the battery.
When the unit operates normally, the unit frame at the front near the door may be slightly warm. This phenomenon is normal because hot tubing is embedded there to prevent condensation from forming on the frame.
Before samples are loaded into the unit, make sure that the unit temperature has reached the set point then load the samples into the freezer in batches. This method can reduce the temperature rise as the load is being introduced.
The temperature display indicates the temperature where the temperature sensor is mounted inside the unit chamber. Temperature uniformity within the chamber may vary from the sensor location due to loading patterns or insufficient temperature stabilization time.
An access port is installed in the back wall of the unit which can be used as the through hole for the thermocouple wires during testing and validation . After all test wires are let through the access port, make sure that the gap in the port is sealed properly with insulation materials. Otherwise, the unit temperature may not come down to the desired temperature. The port ring in the outer wall can also accumulate frost and ice.
When cleaning the unit, mild or neutral detergent solution should be used. (Non- diluted cleaning chemicals can damage the plastic portion of the unit. For directions on making a cleaning solution, please refer to the detergent section in the instructions). Never use a hard wire brush, acid, gasoline, detergent powder, polishing powder, or hot water to clean the freezer as these tools and materials can damage the powder coating and surface of the plastic. Particularly, never use gasoline or a solution with volatile chemicals to clean plastic or rubber parts.
After the freezer runs for some time, a layer of frost usually forms on the interior liner and inner doors. When this layer of frost gets too thick, it can negatively impact the refrigeration performance of the unit. Energy consumption can increase. If the thickness reaches about 5 millimeters, please use the provided scraper to remove the frost.
Before removing the frost, temporarily transfer the stored samples to another freezer. This reduces the chance of property loss due to rising temperatures.
Behind the interior walls, there are many refrigeration tubes. Do not use a knife, an ice pick, or a screwdriver to cut ice and frost. This can potentially damage not only the liner but also the refrigeration tubes.
If the freezer is not in use for a long time, please turn off the power and switch off the backup battery. The power cord should be unplugged.
7
