Carrier 19PV550 Installation, Operation And Maintenance Instructions Download Page 6

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Carry out periodic leak tests. In the European Union,

article 2 of regulation (EU) No.517/2014 makes these

mandatory and sets their frequency. The table below

shows this frequency, as originally published in the

regulation. Check whether an inspection frequency is

also set by other regulations or standards applicable

to your system (e.g. EN 378, ISO 5149, etc.).

A logbook must be established for the systems

that require a tightness check. It should contain

the quantity and the type of fluid present within the

installation (added and recovered), the quantity of

recycled fluid, the date and output of the leak test,

the designation of the operator and its belonging

company, etc.

Leak test periodicity:

System WITHOUT

leakage detection

No test

months

6 months 3 months

System WITH leakage

detection

No test

months

6 months

Refrigerant charge per

circuit (equivalent CO

)

< 5 tons

5 ≤

charge <

50 tons

50 ≤

charge <

500 tons

Charge >

500

tonnes*

Refrigerant charge per

circuit (kg)

R134a

(PRP 1430)

Charge

< 3.5 kg

3.5 ≤

charge

< 34.9 kg

34.9 ≤

charge <

349.7 kg

charge >

349.7 kg

R407C

(PRP 1774)

Charge

< 2.8 kg

2.8 ≤

charge

< 28.2 kg

28.2 ≤

charge <

281.9 kg

charge >

281.9 kg

R410A

(PRP 2088)

Charge

< 2.4 kg

2.4 ≤

charge

< 23.9 kg

23.9 ≤

charge

< 239.5

charge >

239.5 kg

HFOs: R1234ze

No requirement

* From 01/01/2017, units must be equipped with a leak detection system.

•

During the life-time of the system, inspection and tests

must be carried out in accordance with national

regulations.

Protection device checks (EN 378):

The safety devices must be checked on site once a year for

safety devices (see chapter 11.3 - High-pressure safety

switch), and every five years for external overpressure

devices (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 the manufacturer Service for this type of test. The
manufacturer 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 pressure gauge protected against pulsations (filled

with oil with maximum pointer if mechanical), preferably
calibrated (the values displayed on the user interface may
be inaccurate in an instant reading because of the scanning
delay applied in the control)

Complete an HP Test

Neutralize HP soft protection

Cut condenser water flow

Check the cut-off value

Reactivate manually HP switch and reactivate HP soft value"

Repeat the procedure for each unit compressor.

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 thoroughly inspect the protection devices

(valves). If the machine operates in a corrosive environment,

inspect the protection devices more frequently.

Ensure regularly that the vibration levels remain acceptable

and close to those at the initial unit start-up.
Before opening a refrigerant circuit, purge and consult the

pressure gauges.
Change the refrigerant when there are equipment failures,

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.

1.4 - Repair safety considerations

It is compulsory to wear personal protection equipment.

The insulation must be removed and warming up must be

limited by using a wet cloth.

Before opening the unit always ensure that the circuit has

been purged.

If work on the evaporator is required, ensure that the piping

from the compressor is no longer pressurised (as the valve

is not leaktight in the compressor direction).

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. Each
time repairs have been carried out to the unit, the operation of the
protection devices must be re-checked.
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-134a charge, as indicated on the unit name plate. Certain parts
of the circuit can be isolated. Only charge liquid refrigerant R-134a
at the liquid line.

Ensure that you are using the correct refrigerant type before

recharging the unit

The compressors operating are NOT lubricated. Charging any

oil type will impair machine operation and lead to a destruction

of the compressor.
Charging any refrigerant other than the original charge type

(R-134a) will impair machine operation and can even lead to

a destruction of the compressors.

1 - INTRODUCTION