MAINTENANCE WITH Q&A
Page 5-19
I’m not going to use the chamber for a while. Is there anything I should do before storage?
Perform ALL the steps in the Preventive Maintenance Schedule before placing the chamber into storage. This will
ensure that the chamber will be ready to operate when taken out of storage. If the chamber has a problem and is still
under warranty, these problems should be resolved before being placed into storage, since the warranty period starts
from the date of shipment. The chamber should be stored in a conditioned environment. Do not store it outside or
where it will be subjected to dirt or excessive moisture.
I haven’t used the chamber in a while. Is there anything I should do before operation?
Perform ALL the steps in the Preventive Maintenance Schedule before placing the chamber back into service. This
will ensure that nothing has been damaged and that a leak has not developed.
Can the person who services our air conditioning also service the chamber?
Probably not. Most air conditioning mechanics are not familiar with low-temperature cascade refrigeration systems.
While this chamber is relatively easy to maintain and repair, most air conditioning mechanics do not have the
necessary refrigerants and may not be familiar with the microprocessor-based controls. This chamber should only be
serviced by a qualifi ed mechanic that is familiar with low-temperature cascade refrigeration systems. Call Cincinnati
Sub-Zero to recommend one in your area, or to check if the one you would like to use is qualifi ed.
I need to send the chamber to Europe/Asia. Will it work with their power?
Europe and Asia generally have 50 Hz power. Standard voltages in Europe are typically 220V to 240V, while parts
of Asia may be 200V. Operation at 220V to 240V/ 50 Hz requires bucking transformers to lower the voltage to the
compressors to 200V. These transformers are available from Cincinnati Sub-Zero for a reasonable cost and are easy
to install in the fi eld. Note that the cooling performance will be slightly reduced at 50 Hz. Please call Cincinnati Sub-
Zero for details on re-confi guring for 50 Hz. operation.
How often should I charge the refrigeration system?
This chamber uses a closed-loop refrigeration system. Just like your refrigerator at home, it does not need periodic
charging. If the charge is low, this means that there is a leak. Leaks should be repaired before recharging.
What kind of Freon does the chamber use?
The word Freon® is a DuPont registered trade name for their CFC-based refrigerants and is incorrectly used as a
generic term for refrigerants. Cincinnati Sub-Zero chambers do not use CFC-based refrigerants. The high-stage
system uses
R-404A, which is also known as DuPont Suva® HP62. The low-stage system uses R-508B, which is also known as
DuPont Suva® 95. Tundra units use R-410A, also known as Puron and Suva® 9100.
My static pressure is lower than the data plate specifi cation. Is this an indication of a leak
in my refrigeration system?
This does not always mean that there is a leak. Ozone friendly refrigerants use POE oil which has the ability to absorb
refrigerant to the point of actually causing a lower pressure reading. A decrease in the chambers performance along
with lower pressure readings is a possible indicator of a leak. (Please contact Cincinnati Sub-Zero if this occurs).
What is the hissing and clicking sound when my unit is at or approaching set point?
This is normal. The sounds are caused by the solenoid valves alternating between cooling and bypass modes.
Sometimes I see bubbles in the 404 sight glass. Does this mean my chamber has a leak in
it or is undercharged?
This does not necessarily mean that the unit is undercharged or has a leak. Under certain conditions it is possible to
see bubbles in the sight glass. Contact Cincinnati Sub-Zero if you have any questions.
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