Forma Scientific, Inc.________________________________________________Installation
2-2
d. "Smart" Condenser Fans
For maximum compressor protection, all Forma ULT freezers include two tube
axial fans in the compressor housing. When both compressors are running, both fans operate
to pull ambient air through the condenser and over the compressors. When both compressors
are off, one fan remains ready to cycle on when the thermostat senses a temperature rise
above 32°C.
e. Built-In Automatic Voltage Compensation
A built-in, automatic voltage compensator is built into every Forma 8500 Series
non-CFC, Ultra-Low Temperature Freezer to detect and respond to high or low voltage
situations. Voltage from the incoming power supply is monitored and adjusted by the
automatic voltage compensator, ensuring compressor operation within design parameters. A
light on the front of the control panel indicates when incoming voltage is being corrected.
An enlarged condenser and two temperature controlled cooling fans also contribute
to better efficiency, even in high ambient conditions.
2.2 Environmental Conditions
The Forma 8500 Series ULT Freezers are designed to operate in the following
environmental conditions:
• Indoors
• Altitudes up to 2,000 meters
• Temperature Range of +5°C to +40°C.
• Maximum relative humidity of 80% for temperatures up to 31°C, decreasing linearly
to 50% at 40°C.
• Mains supply voltage fluctuation of ± 10% of nominal.
• Installation Category (Overvoltage Category) II, Pollution Degree 2.
• Climatic Class T (Tropical)
3
1
Installation category (overvoltage category) defines the level of transient overvoltage which the
instrument is designed to withstand safely. It depends on the nature of the electricity supply and its
overvoltage protection means. For example, in CAT II which is the category used for instruments in
installations supplied from a supply comparable to public mains such as hospital and research
laboratories and most industrial laboratories, the expected transient overvoltage is 2500 V for a 230
V supply and 1500 V for a 120 V supply.
2
Pollution degree describes the amount of conductive pollution present in the operating
evironment. Pollution degree 2 assumes that normally only non-conductive pollution such as dust
occurs with the exception of accasional conductivy caused by condensation.
3
Class T (Tropical) means that the freezers are electrically safe in a 43°C ambient.
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