Model 8523/8584____________________________________________________________________________Installation
1-3
1.3 Environmental Conditions
The ULT Freezers are designed to be electrically safe in the fol-
lowing environmental conditions:
• Indoors
• Altitude: Up to 2,000 meters
• Temperature: 5°C to 43°C
• Humidity: 80% RH at or below 31°C, decreasing linearly to
50% RH at 40°C
• Mains Supply Fluctuations: ± 10% of nominal.
• Installation Category II 1
• Pollution Degree 2 2
• Class of Equipment I
• Climatic Class T (Tropical)3
1Installation 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 sup-
ply and its overvoltage protection means. For example, in CAT
II which is the category used for instruments in installations sup-
plied from a supply comparable to public mains such as hospital
and research laboratories and most industrial laboratories, the
expected transient overvoltage is 2500V for a 230V supply and
1500V for a 120V supply.
2Pollution degree describes the amount of conductive pollution
present in the operating environment. Pollution degree 2
assumes that normally only non-conductive pollution such as
dust occurs with the exception of occasional conductivity caused
by condensation.
3 Class T (Tropical) means that the freezers are electrically safe
in a 43°C ambient.
1.4 Installing the Wall Bumpers (Refer to Figure 1-3)
The parts bag, located inside the cabinet, contains the
following parts.
2 224 510016 1/4-20 x 5-1/2" Bolt Wall Bumper
2 311 380520 Neoprene Cap Cap Protector
Install the bolts into the pre-tapped holes on the back of
the compressor section. Install a neoprene cap on each bolt.
Refer to Figure 1-3 for the locations of the pre-tapped holes.
1.5 Installing the Shelves
Install the shelf clips into the shelf pilasters (front and
back) at the desired shelf level. Install the shelves in the cabinet
onto the clips.
NOTE: On units having the optional 5 inner door option, refer
to the instructions accompanying the inner door kit.
1.6 Location
Locate the freezer on a firm, level surface in an area
with an ambient temperature between 18°C and 32°C. Provide
ample room to reach the mains disconnect switch (power switch)
located on the rear of the freezer.
For proper ventilation and airflow, a minimum
clearance of 5” at the rear, at the top and on each
side of the freezer is required. Allow adequate
space in front of the freezer for door opening.
1.7 Alarm Contacts, RS-232 Interface and Millivolt Output
Two 9 pin, sub "D" style connectors are located on the
back of the freezer and are labeled. Refer to Figure 1-7 for pin
identification and maximum ratings. See Figure 1-3 for the
location of the connectors on the freezer. The Thermo Forma
part number for the alarm contacts plug is 195482. See Section
2.8 for the RS-232 configuration.
1.8 Optional Temperature Recorder (Model 8560 standard)
a. Connecting recorder battery
Open the glass door of the recorder and connect the 9-
volt battery. The green light on the recorder will come on.
b. Installing the chart paper
1. Open the glass door of the recorder and press button #3 until
the pen begins to move outward.
2. Unscrew the knob at the center of the chart and remove the
paper.
3. Install the new chart paper, position the paper to the correct
time line and replace the knob.
4. Remove the cap from the felt pen and press
button #3.
Qty. Stock # Description Purpose
