AERMEC SGE250, Installation Manual

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6
LOW
VAC
3
5
ON
OPEN
HIGH
4
OPEN
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 valve marked “LOW” on the pressure gauge unit.
• Open the yellow valve marked “VAC” on the pressure gauge unit.
7
OFF
The valve 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.
8
OPEN
To also create a vacuum in the red hose connected to the electronic vacuum
gauge, the red valve marked “HIGH” on the pressure gauge unit must also be
opened.
9
Check the level of vacuum that can be created by the pump, then refer to the
value obtained by the vacuum gauge.
10
VAC
5
OFF
Still under the same conditions, after a few minutes:
• Close the yellow valve marked “VAC”
• Switch off the vacuum pump (which must be fitted with a shut-off valve)
11
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.
12
-
CREATING A VACUUM ON THE REFRIGERANT LINES; If the connection hose seal
test is positive, and no leaks are found, you can proceed to create a vacuum on
the refrigerant lines connecting the condensing unit to the evaporator unit.
13
LOW
VAC
3
5
ON
OPEN
HIGH
4
OPEN
Creating a vacuum on the refrigerant lines
• Switch the vacuum pump back on,
• Open the valve on the hose side and open the brass valves on the outdoor
unit.
• The valves marked “LOW”, “VAC” and “HIGH” on the pressure gauge unit
should be kept open.
• Wait for a few minutes (Note: a good sign that the vacuum is being created is
the change in the noise emitted by the pump).
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