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1 - INTRODUCTION
Only use dry nitrogen for leak tests, possibly with an
appropriate tracer gas.
Do not unweld or flamecut the refrigerant lines or any
refrigerant circuit component until all refrigerant (liquid and
vapour) has been removed from unit. 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 contact with liquid refrigerant on the skin or splashing
it into the eyes. Use safety goggles and 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 relief valve, can cause frostbites
and burns to personnel exposed. Do not ignore such injuries.
Installers, owners and especially service engineers for these
units must:
- Seek medical attention before treating such injuries.
- 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 condi-tioning
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.
ATTENTION: Use only refrigerant R-134a in accordance with
standard 700 AHRI (Air Conditioning, Heating and Refrigeration
Institute). Use of any other refrigerant can expose users and
technicians working on the unit to unexpected risks.
Do not attempt to remove refrigerant circuit components or
fittings, while the unit 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. If the refrigerant circuit is open to carry out
a repair, all circuit openings must be plugged, if the repair
takes longer than 30 minutes. This prevents humidity from
contaminating the circuit, especially the oil. If the work is
expected to take longer, charge the circuit with nitrogen.
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.
8
The refrigerant lines can break under the weight and release
refrigerant, causing personal injury.
Do not climb on a machine. 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 compo-nent
replacement. Consult the list of replacement parts that
corresponds to the specification of the original equip-ment.
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 compo-nents
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.
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