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Open the shut-off valves both on the indoor unit as well as the external unit.
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For all those units having compressors with a capacity greater than 2 HP (1,4 kW), it is absolutely
necessary, before the start-up, to effect an initial preheat of the oil contained within the compressor
itself.
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The preheat is effected by turning on the external main switch so that power is supplied to the unit.
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After the six hour period has elapsed, the compressor can be started up, having made sure that the
oil sump is warm to the touch.
Check that all the electrical connections have been correctly effected, check that terminal screws are
tight, check that the supply voltage is the sameas indicated on the identification sticker of the unit,
after which the compressor can be started up.
It very probable that the compressor may stop almost immediately after start-up due to intervention of
the low pressure switch since the circuit is only partially loaded.
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Depending on the type of condenser control that
operation can result more or less stable:
When a 02'8/$7,1* condenser control (config. 2 - 4) has been fitted, the pressure will be
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When an 21 2)) condenser control (config. 2 - 4) has been fitted, the pressure will rise to 16
stable at a value of about 16 bar (R22 and R407c) or 10 bar (R134a).
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bar and then decrease more or less rapidly depending on the temperature of the air.
with well-water, the pressure valve must be adjusted as indicated in )LJXUH ; if cooling-tower
When a pressure valve has been fitted to control condensing pressure (config. 1 - 3) for use
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water is used in a closed circuit, the installation must foresee a temperature control of the water
coming to the condenser.
If the condensing pressure exceeds 19 bar (R22 and R07c) or 10 bar (R134a), stop the
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compressor and check the condenser which will almost certainly be insufficiently cooled.
In the case of high condensing temperature with water-cooled condensers, check the
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temperature of the water entering and exiting the condenser and if necessary, adjust the water
flow valve.
The suction pressure will vary in parallel with the supply pressure.
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Through the sight glass one will be able to see a bubbling opaque white liquid rushing
quickly past.
has been fitted, condensing pressure during
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