General Precautions - SURREY Multi split Manual De Instalación, Operación Y Mantenimiento

These units are shipped with positive nitrogen pressure. For a proper operation, it is
necessary to evacuate the system and the refrigerant charge after the interconnection of
the units.
The procedure is shown as a diagram below:
START
PERFORM AND WELD THE REFRI-
GERANT PIPING
TEST FOR TIGHTNESS
PERFORM VACUUM UP TO 250
MICRONS Hg IN THE PIPING
BREAK THE VACUMM WITH R-22
CHARGE R-22 (PARTIAL LOAD)
START-UP THE EQUIPMENT
COMPLETE WITH R-22
END
Never charge liquid refrigerant on the low pressure
side of the system.
5.4

General Precautions

a) Keep the cabinet and the area around the unit as clean as possible.
b) Periodically clean the coils with a soft brush. If the fins are too dirty, apply in the
reverse air flow, a compressed air jet or low pressure water. Take care not to damage
the fins. If they are crushed, it is recommended to use a fin "comb", proper to correct
the problem.
c) Check the connections, flange and other fixtures, preventing the appearance of
vibrations, leaks and noises.
d) Ensure the insulation of the metallic parts and the piping are at the proper location
and in good conditions.
e) Periodically check if the voltage and the phase imbalance are within the specified
limits.
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M A N U A L D E I N S TA L A C I Ó N , O P E R A C I Ó N Y M A N T E N I M I E N T O
Notes:
1) It is advisable to braze the copper piping with
inert gas flow (Nitrogen) inside them, preventing
the formation of oxide remainders (scale), or
(See note 1)
other impurities in the frigorigen circuit.
2) The leak test shall be made with a maximum 250
(See note 2)
psig pressure. Use a pressure throttle in the
nitrogen cylinder. We recommend disconnecting
the low pressostat to prevent future leaks in it
(See note 3)
(when dual).
3) In order to evacuate the interconnecting piping
and the units, connect the vacuum pump to the
pressure outlets found in the service valves of
the liquid and suction lines, so that we can have a
(See note 4)
simultaneous evacuation on the high and low
pressure sides.
4) It is advisable to perform the partial charge of
refrigerant through the liquid line, using the
pressure outlet at the service valve.
(See note 5)
5) Add R-22 until the subcooling remains between
8 and 11
is lower, add (See item 10 for more details).
C. If its is higher, remove refrigerant. If it
O