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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
Suniso 3GS
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.
RefrigerantFluidCharge
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.
Fan checks
Direction of rotation
Check that the fans are rotating in the correct direction, i.e. drawing on the coil.
Fan operation:
When regulated, the condenser fan closest to the discharge collector cuts in first, then the others further from the collector.
For vertically-mounted condensers, the fans cut in in parallel to avoid any of the condensers becoming flooded.
All possible measures should be taken to prevent the motors short-cycling.
Number of cycles allowed: a start-up every 5 minutes.
Pre-Setting AndCheckingofSafetySystems
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 and 125°C
-
maximum for R22.
START-UP
Start-up
of
condenser
- Open all the valves (compressor suction and discharge in liquid bottle)
-
Place an ammeter on one phase of the compressor
Close the power circuit-breaker or the fan motor cut-outs.
-
-
Start up compressor by switching the on/off switch to on.
The current increases to maximum and must decrease very rapidly. If this does not happen, stop the compressor to check and
find the fault.
The condenser fans should cut in automatically according to the pre-set set points.
Remainder
of charge
Fill up with the remainder very quickly.
An incomplete charge of fluid will cause considerable superheat and so abnormally high discharge temperatures.
Refrigerant
R22
R404A/ R507
22/34
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