Associated Environmental Systems SD-302, Instruction Manual

Page: 44 / 46

FREQUENTLY ASKED QUESTIONS
6-1
This chamber is being sent to another country, will their power work?
Most countries in Europe and Asia have 50 Hz. Standard voltages. Electricity in Asia and Europe is
typically 220 V to 240 V. Please make sure that local power source matches the required power on
the nameplate. Operation at 220 V to 240 V / 50 Hz requires a bucking transformer to lower the
voltage at the compressor to its 50 Hz rating of 200 V. This option is available from Associated
Environmental Systems and can be easily installed in the field. The cooling performance will be
reduced at 50 Hz. Please call AES for details on reconfiguring for 50 Hz operation.
Why do I smell something when operating the chamber for the fist time?
This odor should not appear after the first uses of the chamber at high temperatures. Associated
Environmental Systems cleans and polishes the chamber before it is shipped from the factory.
At high temperatures the stainless steel polish will emit an odor, but the residue will eventually
dissipate.
Why does the chamber heat/cool slower than specified?
The heating and cooling performance of the chamber is significantly affected by characteristics of
your test sample such as mass, material, size, shape, and live load. The test sample should be placed
in the unit in a manner that allows for air circulation. The test sample should not occupy more than a
third of the total working volume of the chamber. You should not place the test sample directly on
the chamber floor. It should be placed on a shelf to ensure conditioning on all sides. Multiple test
samples should be positioned throughout the chamber to ensure even airflow. If necessary, additional
shelves should be used to evenly distribute the load.
LN
2
and CO
2
boosts for mechanical refrigeration systems increase the temperature change rate and
provide a back up to the mechanical refrigeration system if it fails.
Should I put a filter in front of the air intake?
No, the performance of the chamber will be reduced if there is restricted airflow across the
condenser. Associated Environmental Systems does not recommend putting a filter in front of
the air intake, instead regularly clean the condenser fins.
How to Clean the chamber FAQ
Wash interior regularly with mild soap, particularly following exposure to acid or other highly
corrosive compounds. Do Not clean with steel wool or permit ferrous materials to rub on
stainless surfaces, particles of iron will imbed in the stainless and rust. Gummy deposits if
allowed to remain may result in electrolytic action and pitting. The condenser can be cleaned
with a vacuum.
Why is there ice or “snow” buildup in the chamber?
At low temperatures moisture will condense out of the air and freeze. When the chamber is heated,
the ice or frost will turn into water.