Carrier 30KAV-ZE Series - Maintenance Safety Considerations; Electrical Safety Considerations

1.4 - Maintenance safety considerations
It is compulsory to wear ear protection when working near
the unit and the unit is in operation.
The manufacturer recommends the following template for the
maintenance log (the table below is only given as a guide and
does not engage the manufacturer's liability).
Operation Name of the
commissioning
engineer
Applicable
national
regulations
Verication
organisation
Date Nature
(1)
(1) Maintenance
Any technician carrying out work on the electrical or refrigerating
section must be authorised, with the relevant qualications and
certications, including for brazing operations and for operation
of the shut-o󰀨 valve. He/she must have been specically trained
on this equipment and system.
The manual valves must only be manipulated when the machine
is o󰀨. Do not forget to ret protective caps to prevent leaks.
Technicians working on the units must be equipped as follows:
Personal protective
equipment (PPE)
(1)
Operations
Handling
Maintenance,
service
Welding or
brazing
(2)
Protective gloves, eye
protection, safety shoe,
protective clothing.
X X X
Ear protection. X X
Filtering respirator. X
(1) We recommend compliance with the instructions in the EN 378-3 standard.
(2) Performed in the presence of A1 refrigerant according to EN 378-1.
Regularly check that the vibration levels remain acceptable and
close to those at initial machine start-up.
Before opening a refrigerant circuit, drain and consult the pressure
indicators.
If the refrigerant circuit remains open after an intervention (such
as a component replacement, etc.):
■ Seal the openings if the duration is less than a day
■ Beyond this time, charge the circuit with a dry, inert gas
(nitrogen).
The objective is to prevent penetration of atmospheric humidity
and the resulting corrosion of the unprotected internal steel walls.
1.5 - Electrical safety considerations
ELECTRICAL RISK:
Never work on a unit that is still energized.
Never work on any of the electrical components until the general
power supplies to the unit have been isolated and locked out.
WARNING: Even if the unit is stopped, the power circuit
remains energized, unless the unit or circuit disconnect
switch is open. Refer to the wiring diagram for further details.
Follow the appropriate safety guidelines.
When working close to the condenser fans, particularly when
removing the grilles, ensure that the power supply to the fans is
switched o󰀨 to ensure they cannot run.
WARNING:Thevariablefrequencydrives(VFD)ttedtothe
units have circuit capacitors which take twenty (20) minutes
to discharge after the power supply is disconnected.
After disconnecting the power supply to the electrical box, wait for
twenty minutes before accessing the electrical box or VFD. This
value is a guide and may di󰀨er from one VFD to another: refer to
the information given on the VFD to nd out the precise value.
Before any intervention, verify that there is no voltage present at
any accessible conducting parts of the power circuit.
WARNING : When option 295+ for Ultra Fast Capacity recovery
is present, energy is stored inside the equipment and 24Vdc
voltage is present even if the main disconnect switch was
switchedo.Refertosectiondescribingoption295+inthis
document for more explanations.
WARNING: The compressors on 30KAVPZE units
feature motors with permanent magnets. Do not open
the compressor. Ensure that the terminal box is
securely fixed in place before filling the machine with
refrigerant, draining the refrigerant or rotating the motor shaft.
The compressor cannot be removed.
WARNING: Strong magnetic eld inside the compressor
casing. An electrical current may be generated on the
compressor terminals and on the circuits which are connected
whenlling/emptyingtherefrigerant.
1 - SAFETY CONSIDERATONS
10