Carrier AquaSnap Touch Pilot Junior Series - Equipment and Components under Pressure; Maintenance Safety Considerations

6
1.4 - 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 components under
pressure (declaration, re-qualification, retesting, etc.). The
characteristics of this equipment/these components are given on
the nameplate or in the required documentation, supplied with the
products. These units comply with the European Pressure
Equipment Directive.
The units are intended to be stored and operate in an environment
where the ambient temperature must not be less than the lowest
allowable temperature indicated on the nameplate.
Do not introduce high static and dynamic pressure compared with
the existing operating pressures - either service or test pressures
- in the refrigerant circuit or in the heat transfer circuit, especially:
• limiting the elevation of the condensers or evaporators
• taking the circulating pumps into consideration.
1.5 - Maintenance safety considerations
Carrier recommends the following drafting for a logbook (the table
below should not be considered as reference and does not involve
Carrier responsibility):
Intervention
Name of the
commissioning
engineer
Applicable
national
regulations
Verication
Organism
Date Nature
(1)
(1) Maintenance, repairs, regular verications (EN 378), leakage, etc.
Engineers working on the electric or refrigeration components
must be authorized, trained and fully qualied to do so (e.g.
electricians trained and qualied in accordance with IEC 60364
Classication BA4).
All refrigerant circuit work must be carried out by a trained person,
fully qualied to work on these units. He must have been trained
and be familiar with the equipment and the installation. All welding
operations must be carried out by qualied specialists.
Aquasnap units use high-pressure R-410A refrigerant (the unit
operating pressure is above 40 bar, the pressure at 35°C air
temperature is 50% higher than for R-22). Special equipment must
be used when working on the refrigerant circuit (pressure gauge,
charge transfer, etc.).
Any manipulation (opening or closing) of a shut-off valve
must be carried out by a qualied and authorised engineer,
observing applicable standards (e.g. during draining
operations). The unit must be switched off while this is done.
NOTE: The unit must never be left shut down with the liquid
line valve closed, as liquid refrigerant can be trapped between
this valve and the expansion device and lead to the risk of a
pressure increase. This valve is situated on the liquid line
before the lter drier box.
Equip the engineers that work on the unit as follows:
Personal protection
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 x x
(1) We recommend to follow the instructions in EN 378-3.
(2) Performed in the presence of A1 refrigerant according to EN 378-1.
Never work on a unit that is still energized. 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 deenergized before resuming the work.
ATTENTION: Even if the unit has been switched off, the power
circuit remains energized, unless the unit or customer circuit
disconnect switch is open. Refer to the wiring diagram for
further details. Attach appropriate safety labels.
If any work is carried out in the fan area, specically if the
grilles or casings have to be removed, cut the power supply
to the fans to prevent their operation.
It is recommended to install an indicating device to show if
part of the refrigerant has leaked from the valve. The presence
of oil at the outlet orice is a useful indicator that refrigerant
has leaked. Keep this orice clean to ensure that any leaks
are obvious. The calibration of a valve that has leaked is
generally lower than its original calibration. The new
calibration may affect the operating range. To avoid nuisance
tripping or leaks, replace or re-calibrate the valve.
OPERATING CHECKS:
Important information regarding the refrigerant used:
This product contains uorinated greenhouse gas covered
by the Kyoto protocol.
Fluid type: R410A
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 equipment
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 qualied and certied 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:
System WITHOUT
leakage detection
No Check 12 Months 6 Months 3 Months
System WITH leakage
detection
No Check 24 Months 12 Months 6 Months
Refrigerant charge/
circuit (CO
2
equivalent)
< 5 Tons
5 ≤
Charge
< 50 Tons
50 ≤
Charge
< 500 Tons
Charge
> 500
Tons
(1)
Refrigerant charge/
Circuit (kg)
R134A
(GWP 1430)
Charge
< 3.5 kg
3.5 ≤
Charge
< 34.9 kg
34.9 ≤
Charge
< 349.7 kg
Charge
> 349.7 kg
R407C
(GWP 1774)
Charge
< 2.8 kg
2.8 ≤
Charge
< 28.2 kg
28.2 ≤
Charge
< 281.9 kg
Charge
> 281.9 kg
R410A
(GWP 2088)
Charge <
2.4 kg
2.4 ≤
Charge
< 23.9 kg
23.9 ≤
Charge
< 239.5 kg
Charge
> 239.5 kg
HFO’s: R1234ze
No requirement
(1) From 01/01/2017, units must be equipped with a leakage detection system
1 - INTRODUCTION