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7/8" - 14UNF - 2A
FIG. 1 - Safety Valve
Inhalation of high concentrations of vapor is harmful
and may cause heart arrhythmia, unconsciousness or
death. Vapor is heavier than air and reduces the amount
of oxygen available for breathing. These products can
cause irritation to eyes and skin. Products in a state of
decomposition are hazardous.
Equipment and components under pressure
These products incorporate equipment or components under
pressure, manufactured by Carrier or other manufacturers.
We recommend that you consult the appropriate national
association or the owner of the components and equipment
under pressure (statements, re-qualifi cation, retesting, etc.).
The features of this equipment / components are specifi ed
on the nameplate or in the required documentation provided
with the products.
Safe maintenance considerations
Engineers working on electrical or cooling components must
be authorized and fully prepared for such (trained and qualifi ed
electricians in accordance with local regulations).
All repairs made to refrigerant circuits must be performed by
trained technicians, who are fully qualifi ed to work with these
units. This person should be familiar with both the equipment
and its installation. All welding operations must be performed
by qualifi ed experts.
Never work on a unit that is still powered on. Never work on
any of the electrical components until the power supply has
been cut off by turning off the switch or power box breaker.
Use a locking system to prevent powering on during service.
If the work is interrupted, make sure that all circuits are turned
off before restarting it. Once a year check if the high-pressure
switch is connected properly and if it turns off at the correct
value. (Disconnect between 635 and 665 PSI). At least once a
year thoroughly inspect the protection devices (valves and
fuses). If the machine operates in a corrosive environment,
inspect the safety devices more often. Regularly perform a leak
test and if you fi nd any, repair it immediately.
Safe repairs considerations
All installation parts should be serviced by the personnel in
charge in order to avoid damage or injury.
Defects and leaks must be repaired immediately.
In the event of a leak, remove all refrigerant, repair the leak
detected and recharge the circuit with full charge of the
specifi ed refrigerant, as indicated on the unit nameplate. Do
not exceed the charge. Charge only liquid refrigerant R-410A
or in the liquid line. Make sure you are using the correct
refrigerant type before recharging the unit.
Using other than the original refrigerant aff ects machine
operation and may even damage the compressors.
Compressors operate with R410-A refrigerant and must be
supplied with oil, according to the unit type (fi xed or variable).
See CTG table on page 7.
Do not use oxygen in the purge lines or to pressurize a
machine under any circumstance. Oxygen gas reacts violently
with oil, grease or other common substances.
Do not exceed the specified maximum operating pressures.
Check the maximum and minimum test pressures allowed
in the operation manual and the pressures given on the
unit nameplate.
Do not use air for leak testing. Use only refrigerant or dry
nitrogen. Do not weld or use torch in the refrigerant lines or
any refrigerant circuit component until it (liquid or vapor) has
been removed from chiller. Steam traces can be moved with
the air of dry nitrogen. Refrigerant in contact with an open
fl ame produces toxic gases.
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