Profroid COPELAND Notice D'instructions page 22

- Place a LP pressure gauge at the compressor suction or on the header.
- Start up the compressor with the start button
- As soon as it is started, stop the compressor.
- During that time, if the pressure gauge showed that the pressure went down, the rotation direction is correct.
- In the opposite case, invert the 2 phases on the compressor breaker and repeat the same operation for checking.
NB: We advise you to include a rotation direction detector in your electrical diagrams.
Leakage testing
Pressurise the whole system, including the compressor, using a neutral gas (Nitrogen R) with a (non-liquid, non-colouring) tracer,
at a minimum pressure of 10 bars and at a maximum pressure of less than 20.5 bars, isolating the LP (low pressure) switches.
Important
: If the LP circuit is fitted with a safety valve (e.g.: on the suction accumulator) the test pressure on that part of the
circuit should be approx. 20% below the operating pressure of this valve.
Thorough leakage detection using a suitable detector should be carried out.
After these tests, the gas must be removed. Fit the drier cartridges in their casing.
Dehydration of circuits
This operation must be carried out with all valves open (including solenoid valves) with connection to a vacuum pump:
of the low pressure side
-
of the high pressure side
-
The quality of drying should not be judged by the speed at which the level of vacuum is reached but on the effective time
it is held (24 hours at 0.7 mbar is a good standard).
The total increase in pressure during that period should not be more than 2.6 mbar. The residual moisture in the system should be
less than 20ppm.
When the installation is under vacuum, an insulation check of the motor should not be carried out nor should the compressors be
started before at least 1 bar of fluid pressure is reintroduced.
This is to prevent motor winding damage.
Oil level checks
After a minimum of 2 hours of operation, check the oil compressor levels.
¾ sight glass working.
Levels should never exceed the manufacturers' recommendations.
Oils
The compressor Manufacturer's recommendations should be followed according to the type of refrigerant.
The use of colorants or UV tracers as leak detectors in the oil, is not allowed.
oil
Mobil Arctic EAL 22 CC
ICI Emkarate RL32CF
This table is not exhaustive, but summarises the principal oils used. If any other oil is to be used, we would advise contacting
PROFROID or the compressor manufacturers.
Please remember that the oil return does not depend only on the type of oil used, but also on the design of the refrigerating circuit
(drops, risers and U-bends) and the gas velocities, particularly at low pressure, must be > 4m/s horizontal and > 7m/s vertical.
Refrigerant Fluid Charge
It is possible to charge in liquid phase when the installation is under vacuum through the charging valve provided on the liquid
receiver (depending on models).
The charging bottle must remain connected to this valve permanently during the whole start-up period to enable instant adjustment
while charging the installation.
Pre-Setting And Checking of Safety Systems
Pre-set the HP (High Pressure) pressure switches (optional) and test manually. Maximum setting: upper limit of the
-
compressor range, checking MSP value.
Pre-set the LP (Low Pressure) pressure switches (optional) and test manually. Do not set these below atmospheric
-
pressure.
If discharge thermostats are installed as an option, these must be charged with gas and adjusted to 120°C minimum.
-
START-UP
Start-up of compressor
- Open all the valves (compressor suction and discharge in liquid bottle)
- Place an ammeter on one phase of the compressor
Refrigerant
R404A/ R507
19/29