They include a sizing method and examples for configura-tion
and calculation. Under certain conditions these stan-dards
permit connection of several valves to the same discharge
pipe. Note: Like all other standards these EN standards are
available from national standards organizations.
These pipes must be installed in a way that ensures that people
and property are not exposed to refrigerant leaks. These fluids
may be diffused in the air, but far away from any building air
intake, or they must be discharged in a quantity that is
appropriate for a suitably absorbing environment.
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 orifice is a useful indicator that refrigerant
has leaked. Keep this orifice 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 a nuisance tripping or leaks,
replace or re-calibrate the valve.
Periodic check of the relief valves: See paragraph 1.3
“Maintenance safety considerations”.
Provide a drain in the discharge circuit, close to each relief
valve, to avoid an accumulation of condensate or rain water.
All refrigerant handling precautions must comply with local
regulations.
Ensure good ventilation, as accumulation of refrigerant in an
enclosed space can displace oxygen and cause asphyxiation
or explosions.
Inhalation of high concentrations of vapour is harmful and
may cause heart irregularities, unconsciousness, or death.
Vapour is heavier than air and reduces the amount of oxygen
available for breathing. These products cause eye and skin
irritation. Decomposition products are hazardous.
1.2 - 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-nents under
pressure (declaration, re-qualification, retesting, etc.). The
characteristics of this equipment/these components are given on
the nameplate or in the required documenta-tion, supplied with
the products.
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.
See section “9.6 - Pressure vessels”.
1.3 - 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
Verification
Organism
Date
Nature
(1)
(1) Maintenance, repairs, regular verifications (EN 378), leakage, etc.
Engineers working on the electric or refrigeration components
must be authorized, trained and fully qualified to do so.
All refrigerant circuit repairs must be carried out by a trained person,
fully qualified 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 qualified specialists.
The insulation must be removed and heat generation must be
limited by using a wet cloth.
Any manipulation (opening or closing) of a shut-off valve must
be carried out by a qualified and authorised engineer. These
procedures must be carried out with the unit shut-down.
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. (This valve is situated
on the liquid line before the filter 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,
X
X
X
eye protection,
safety shoe,
protective clothing.
Ear protection.
X
X
Filtering respirator.
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 using the
disconnect switch(es) in the control box(es).
If any maintenance operations are carried out on the unit, lock
the power supply circuit in the open position ahead of the
machine.
ATTENTION: The frequency variators used in the 30XW-
V/30XWHV units are equipped with capacitor batteries with
a discharge time of twenty (20) minutes after disconnecting
the power.
After disconnecting the power to the control box, wait twenty
minutes before openeing the control box.
Before any intervention, verify that there is no voltage present
at any accessible conducting parts of the power circuit.
If the work is interrupted, always ensure that all circuits are
still deenergized before resuming the work.
Operating checks:
CAUTION
INTERNAL FAILURE HAZARD
An internal failure in the frequency converter can result in
serious injury, when the frequency converter is not properly
closed.
Ensure that all safety covers are in place and securely
fastened, before applying power.
Important information regarding the refrigerant used:
This product contains fluorinated greenhouse gas covered
by the Kyoto protocol.
Fluid type: R134a
Global Warming Potential (GWP): 1430
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.
1 - INTRODUCTION
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