Equipment And Components Under Pressure; Maintenance Safety Considerations - Carrier 50UA-UH 135 Installation, Operation And Maintenance Instructions

1.3 - Equipment and components under pressure

These products incorporate equipment or components under
pressure, manufactured by Carrier or other manufacturers.
We recommend that you consult your appropriate national
trade association or the owner of the equipment or compo-
etc.). The characteristics of this equipment/these components
are given on the nameplate or in the required documentation,
supplied with the products.
Do not introduce high static and dynamic pressure compared
with the existing operating pressures - either service or test
pressures in the refrigerant circuit.

1.4 - Maintenance safety considerations

Engineers working on the electric or refrigeration or gas
heating components must be authorised, trained and fully
All refrigerant circuit work must be carried out by a trained
been trained and be familiar with the equipment and the
installation. All welding operations must be carried out by
These units use high-pressure R-410A refrigerant (the unit
operating pressure is above 40 bar). Special equipment must
be used when working on the refrigerant circuit (pressure
gauge, charge transfer, etc.).
Any manipulation of a refrigerant recovery valve must be
applicable standards (e.g. during refrigerant removal). The
unit must be switched off while this is done.
During any handling, maintenance and service operations
the engineers working on the unit must be equipped with
safety gloves, glasses, shoes and protective clothing.
Never work on a unit that is still energised. Never work
on any of the electrical components, until the general
power supply to the unit has been cut.
If any maintenance operations are carried out on the unit,
lock the power supply circuit in the open position and
secure the machine upstream with a padlock.
If the work is interrupted, always ensure that all circuits
are still deenergised before resuming the work.
ATTENTION: Even if the unit has been switched off, the
power circuit remains energised, unless the unit or circuit
disconnect switch is open. Refer to the wiring diagram for
further details. Attach appropriate safety labels.
the grilles or casings have to be removed, cut the power
supply to the fans to prevent their operation.
OPERATING CHECKS:
• IMPORTANT INFORMATION REGARDING
THE REFRIGERANT USED:
covered by the Kyoto protocol.
Refrigerant type: R-410A
Global Warming Potential (GWP): 2088
CAUTION:
1. Any intervention on the refrigerant circuit of this
product should be performed in accordance with the
applicable legislation. In the EU, the regulation is called
F-Gas, N°517/2014.
2. Ensure that the refrigerant is never released to the
atmosphere during installation, maintenance or equip-
ment disposal.
3. The deliberate gas release into the atmosphere is not
allowed.
4. If a refrigerant leak is detected, ensure that it is
stopped and repaired as quickly as possible.
5. Only a qualified and certified personnel can perform
installation operations, maintenance, refrigerant circuit
leak test as well as the equipment disposal and the
refrigerant recovering.
6. The gas recovery for recycling, regeneration or
destruction is at customer charge.
7. Periodic leak tests have to be carried out by the
customer or by third parties. The EU regulation set the
periodicity here after:
No check 12 months 6 months
System WITHOUT leakage
detec on
No check 24 months 12 months
System WITH leakage
detec on
Refrigerant charge/circuit
< 5 tons
(CO equivalent)
2
R134a
Refrigerant charge
(GWP
charge (kg) < 3.5 kg
1430)
charge
R407C
< 2.8 kg
(GWP
1774)
R410A charge
(GWP < 2.4 kg
2088)
HFO's : R123 no requirement
* From 01/01/2017, units must be equipped with a leakage
detection system
8. A logbook must be established for equipments subject to
periodic leak tests. It should contain the quantity and the type of
fluid present within the installation (added and recovered), the
quantity of recycled fluid, regenerated or destroyed, the date and
output of the leak test, the designation of the operator and its
belonging company, etc.
9. Contact your local dealer or installer if you have any
questions.
Protection device checks:
• If no national regulations exist, check the protection
devices on site in accordance with standard EN378:
once a year for the high-pressure switches.
3 months
6 months
5 charge 50 charge charge >
< 50 tons < 500 tons 500 tons*
3.5 34.9 charge charge
charge < < 349.7 kg > 349.7 kg
34.9 kg
2.8 28.2 charge charge
charge < < 281.9 kg > 281.9 kg
28.2 kg
2.4 23.9 charge charge
charge < < 239.5 kg > 239.5 kg
23.9 kg
5