AERMEC SC1200 - Page 19

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CHECKING THAT THE COCKS ARE SHUT OFF ON THE OUTDOOR UNIT; Ensure that the shut-
off cocks (brass) on the outdoor unit are completely closed (carefully check the cocks
with a suitable Allen key).
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CHECKING THE CONNECTION HOSES AND LEVEL OF VACUUM CREATED BY THE PUMP;
Switch on the vacuum pump. To connect the two hoses and thereby connect the LP
side to the vacuum pump:
- Open the blue cock marked “LOW” on the pressure gauge unit.
- Open the yellow cock marked “VAC” on the pressure gauge unit.
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The cock placed on the connection hose to the outdoor unit must remain closed,
therefore, when the vacuum pump is on, the blue and yellow connection hoses are
under vacuum.
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To also create a vacuum in the red hose connected to the electronic vacuum gauge,
the red cock marked “HIGH” on the pressure gauge unit must also be opened.
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Check the level of vacuum that can be created by the pump, then refer to the value
obtained by the vacuum gauge.
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Still under the same conditions, after a few minutes:
- Close the yellow cock marked “VAC”
- Switch off the vacuum pump (which must be fitted with a shut-off valve)
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Check that the vacuum gauge does not show a drop in the vacuum level compared
with when the pump was operating. This operation also serves as a safety check to
ensure that the hoses used are not worn and therefore leaking.
LOW
VAC
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ON
OPEN
HIGH
4
OPEN
OFF
OPEN
VAC
5
OFF
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