7
1.4 - Repair safety considerations
Equip the engineers that work on the unit with the protections
described in section 1.3 above.
All installation parts must be maintained by the personnel in charge,
in order to avoid material deterioration and injuries to people. Faults
and leaks must be repaired immediately. The authorized technician
must have the responsibility to repair the fault immediately. After
each repair of the unit, check the operation of the protection devices
and create a report of the parameter operation at 100%.
Comply with the regulations and recommendations in unit and
HVAC installation safety standards, such as: EN 378, ISO 5149,
etc.
If a leak occurs or if the refrigerant becomes contaminated (e.g.
by a short circuit in a motor) remove the complete charge using
a recovery unit and store the refrigerant in mobile containers.
Repair the leak detected and recharge the circuit with the total
R-1234ze(E) charge, as indicated on the unit name plate. Certain
parts of the circuit can be isolated. Only charge liquid refrigerant
R-1234ze(E) at the liquid line.
Ensure that you are using the correct refrigerant type before
recharging the unit. Charging any refrigerant other than the
original charge type R-1234ze(E) will impair machine operation
and even destroy the compressors. The compressors operating
with this refrigerant type are lubricated with a synthetic
polyolester oil.
RISK OF EXPLOSION:
Never use air or a gas containing oxygen during leak tests to
purge lines or to pressurise a machine. Pressurised air
mixtures or gases containing oxygen can be the cause of an
explosion.
Only use dry nitrogen for leak tests, possibly with an
appropriate tracer gas.
If the recommendations above are not observed, this can
have serious or even fatal consequences and damage the
installation.
Never exceed the specified maximum operating pressures.
Verify the allowable maximum high- and low-side test
pressures by checking the instructions in this manual and
the pressures given on the unit name plate.
Do not unweld or flamecut the refrigerant lines or any
refrigerant circuit component until all refrigerant (liquid and
vapour) as well as the oil have been removed from chiller.
Traces of vapour should be displaced with dry air nitrogen.
Refrigerant in contact with an open flame produces toxic
gases.
The necessary protection equipment must be available, and
appropriate fire extinguishers for the system and the
refrigerant type used must be within easy reach.
Do not siphon refrigerant.
Avoid spilling liquid refrigerant on skin or splashing it into
the eyes. Use safety goggles and safety gloves. Wash any
spills from the skin with soap and water. If liquid refrigerant
enters the eyes, immediately and abundantly flush the eyes
with water and consult a doctor.
The accidental releases of the refrigerant, due to small leaks
or significant discharges following the rupture of a pipe or
an unexpected release from a safety valve, can cause
frostbites and burns to personnel exposed. Do not ignore
such injuries. Installers, owners and especially service
engineers for these units must:
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Seek medical attention before treating such injuries.
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Have access to a first-aid kit, especially for treating eye
injuries.
We recommend to apply standard EN 378-3 Annex 3.
Never apply an open flame or live steam to a refrigerant
container. Dangerous overpressure can result. If it is
necessary to heat refrigerant, use only warm water.
During refrigerant removal and storage operations follow applicable
regulations. These regulations, permitting conditioning and recovery
of halogenated hydrocarbons under optimum quality conditions
for the products and optimum safety conditions for people, property
and the environment are described in standard NF E29-795.
Any refrigerant transfer and recovery operations must be carried
out using a transfer unit. A 3/8” SAE connector on the manual liquid
line valve is supplied with all units for connection to the transfer
station. The units must never be modified to add refrigerant and oil
charging, removal and purging devices. All these devices are
provided with the units. Please refer to the certified dimensional
drawings for the units.
Do not re-use disposable (non-returnable) cylinders or
attempt to refill them. It is dangerous and illegal. When
cylinders are empty, evacuate the remaining gas pressure,
and move the cylinders to a place designated for their
recovery. Do not incinerate them.
ATTENTION: Only use refrigerant R1234ze(E), in accordance
with 700 AHRI (Air conditioning, Heating and Refrigeration
Institute). The use of any other refrigerant may expose users
and operators to unexpected risks.
Do not attempt to remove refrigerant circuit components or
fittings, while the machine is under pressure or while it is
running. Be sure pressure is at 0 kPa and that the unit has
been shut-down and de-energised before removing
components or opening a circuit.
Do not attempt to repair or recondition any safety devices when
corrosion or build-up of foreign material (rust, dirt, scale, etc.)
is found within the valve body or mechanism. If necessary,
replace the device. Do not install relief valves in series or
backwards.
ATTENTION: No part of the unit must be used as a walk-way,
rack or support. Periodically check and repair or if necessary
replace any component or piping that shows signs of damage.
The refrigerant lines can break under the weight and release
refrigerant, causing personal injury.
Use a platform, or staging to work at higher levels.
Use mechanical lifting equipment (crane, hoist, winch, etc.) to
lift or move heavy components. For lighter components, use
lifting equipment when there is a risk of slipping or losing
your balance.
Use only original replacement parts for any repair or
component replacement. Consult the list of replacement parts
that corresponds to the specification of the original
equipment.
Do not drain water circuits containing industrial brines,
without informing the technical service department at the
installation site or a competent body first.
Close the entering and leaving water shutoff valves and purge
the unit water circuit, before working on the components
installed on the circuit (screen filter, pump, water flow switch,
etc.).
Do not loosen the water box bolts until the water boxes have
been completely drained.
Periodically inspect all valves, fittings and pipes of the
refrigerant and hydraulic circuits to ensure that they do not
show any corrosion or any signs of leaks.
It is recommended to wear ear defenders, when working near
the unit and the unit is in operation.
1 - INTRODUCTION
