Table of Contents
Advertisement
INTRODUCTION (Cont.)
1.3 - Maintenance safety considerations
Technicians working on the electric or refrigeration compo-
nents must be authorized, trained and fully qualified to do so.
All refrigerant circuit work 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.
38RM-N 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 qualified and authorised engineer,
observing applicable standards (e.g. during draining opera-
tions). 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 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 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, specifically if the
grilles or casings have to be removed, cut the power supply to
the fans to prevent their operation. It is also recommended to
block the rotation of the blades during any intervention.
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 obvi-
ous. 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.
2. OPERATING CHECKS
IMPORTANT INFORMATION REGARDING THE REFRIG-
ERANT USED :
This product contains fluorinated greenhouse gas covered by the
Kyoto protocol.
Refrigerant type : R-410A
Global Warming Potential (GWP) : 1975
ATTENTION
• Prevent the release of fluorinated gas from the unit.
Ensure that fluorinated gas is never released to the
atmosphere during installation, maintenance or disposal.
If a leak of fluorinated gas is detected, stop the leak and
repair it as quickly as possible.
• Only a qualified service technician is allowed to access this
product and to correct the fault.
• Any handling of fluorinated gas contained in this product (e.g.
moving the product or topping up the gas) must comply with
EC regulation no. 842/2006 about certain fluorinated
greenhouse gases and any other applicable local legislation.
• Contact your local dealer if you have any questions.
• Periodic inspections for refrigerant leaks may be required
depending on European or local legislation.
Please contact your local dealer for more information.
• During the life-time of the system, inspection and tests must
be carried out in accordance with national regulations.
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, every five years for external safety
valves.
If the machine operates in a corrosive environment, inspect
the protection devices more frequently.
Regularly carry out leak tests and immediately repair any
leaks.
Ensure regularly that the vibration levels remain acceptable
and close to those at the initial unit start-up.
Before opening a refrigerant circuit, transfer the refrigerant
to bottles specifically provided for this purpose and consult
the pressure gauges.
Change the refrigerant after an equipment failure, following a
procedure such as the one described in NF E29-795 or carry out
a refrigerant analysis in a specialist laboratory.
If the refrigerant circuit remains open for longer than a day
after an intervention (such as a component replacement), the
openings must be plugged and the circuit must be charged with
nitrogen (inertia principle). The objective is to prevent penetra-
tion of atmospheric humidity and the resulting corrosion on the
internal walls and on non-protected steel surfaces.
2
Advertisement
Table of Contents
