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Principles
Procedure rules with refrigerant:
Cooling installations must be inspected and maintained
regularly and thoroughly by specialists. Their activities
should be supervised and checked by properly trained
people. To minimize discharge to the atmosphere,
refrigerants and lubricating oil must be transported using
methods which reduce leaks and losses to a minimum.
Leaks must be repaired immediately.
All units are equipped with two special connections in suction
and liquid lines, which allows the connection of recovery
valves with quick connection without refrigerant loss.
If the residual pressure is too low to make the transfer, a
refrigerant recovery unit built for this purpose should be used.
The compressor lubricating oil contains refrigerant. All the
oil drained from a system during maintenance must be
properly handled and stored.
Refrigerant under pressure must never be discharged into
the atmosphere.
IMPORTANT
The 30E units are charged with liquid refrigerant
HFC R410A.
Low charge
If there is not enough refrigerant in the system, gas bubbles
will appear in the liquid sight glass.
If the charge is too low, large bubbles will appear in the sight
glass, and the suction pressure will drop. The compressor
suction will overheat.
The machine must be recharged after the leak is repaired. Find
the leak and drain the system with a refrigerant recovery unit.
Perform the repair, test for leaks, and recharge the system.
IMPORTANT
After repairing the leak, the circuit should be tested
without exceeding the maximum operating pressure in
low side, as indicated on the unit nameplate.
The refrigerant must always be refi lled in the liquid line in
liquid form.
The refrigerant cylinder must always contain at least 10% of
its initial charge.
Regarding the amount of refrigerant per circuit, refer to the
data on the unit nameplate.
IMPORTANT
Carrier
does
not
recommend,
procedures, that the refrigerant be collected in the
condenser unit, using the compressor unit. For refrigerant
collection, use the appropriate pump and cylinder.
Never put the unit in operation without making sure that
the service valves are open.
Failure to follow the above recommendations can
cause potential damage to the product, installation and
physical integrity of persons who are nearby during the
procedure.
6.2 - Electrical maintenance
When working in the unit, follow the safety instructions
provided in section 1.
•
It is recommended to check that all electrical connections
are to the proper torque:
a. Upon receipt of the unit, at the time of installation, and
before the initial start-up.
b. One month after the first start-up, the electrical
components have reached their nominal operating
temperatures.
c.
Regularly, once a year.
for
maintenance
49
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