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1 - INTRODUCTION
8. A logbook must be established for equipments subject to
periodic leak tests. It should contain the quantity and the
type of fluid present within the installation (added and
recovered), the quantity of recycled fluid, regenerated or
destroyed, the date and output of the leak test, the
designation of the operator and its belonging company,
etc.
9. Contact your local dealer or installer if you have any
questions.
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 relief valves.
The company or organisation that conducts a pressure switch test
shall establish and implement a detailed procedure to fix:
- Safety measures
- Measuring equipment calibration
- Validating operation of protective devices
- Test protocols
- Recommissioning of the equipment.
Consult Carrier Service for this type of test. Carrier mentions here
only the principle of a test without removing the pressure switch:
- Verify and and record the set-points of pressure switches
and relief devices (valves and possible rupture discs)
- Be ready to switch-off the main disconnect switch of the power
supply if the pressure switch does not trigger (avoid over-
pressure or excess gas in case of valves on the high-pressure
side with the recovery condensers)
- Connect a calibrated pressure gauge (the values displayed
on the user interface may be inaccurate in an instant reading
because of the scanning delay applied in the control)
- Activate the HP quick test included in the control procedure.
CAUTION: If the test leads to replacing the pressure switch,
it is necessary to recover the refrigerant charge, these
pressure switches are not installed on automatic valves
(Schraeder type).
At least once a year, visually inspect the protection devices
(valves, pressure switches).
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
penetration of atmospheric humidity and the resulting
corrosion on the internal walls and on non-protected steel
surfaces.
1.6 - Repair safety considerations
All installation parts must be maintained by the personnel in charge
to avoid deterioration and injury. Faults and leaks must be repaired
immediately. The authorized technician must have the responsibility
to repair the fault immediately. After each unit repair check the
operation of the protection devices and create a 100% parameter
operation report.
Comply with the regulations and recommendations in unit and
HVAC installation safety standards, such as: EN 378, ISO 5149,
etc.
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. Oxygen reacts violently with oil and grease.
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 the heat
pump. Traces of vapour should be displaced with dry nitrogen.
Refrigerant in contact with an open flame can produce 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 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 (blowlamp) or overheated steam
(high-pressure cleaner) to the refrigerant circuit. Dangerous
overpressure can result.
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.
Refer to the certified dimensional drawings for the units.
It is dangerous and illegal to re-use disposable (non-
returnable) cylinders or attempt to refill them. When cylinders
are empty, evacuate the remaining gas pressure, and move
them to a designated place for recovery. Do not incinerate.
7
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