Technical data

4. Check the closing caps in the backup boxes

In order to carry out this part of the testing

successfully, you need to make sure that all the 90°

bends of the backup boxes are provided with the

taps for the airtight closure of the system.

Location of

losses

Central vacuum systems

6. Switch on the testing vacuum cleaner

Wait a few seconds so that the system creates the

depression needed for the measurement. The

vacuum gauge will indicate the exact depression

value once the pointer has come to a standstill.

7. Measure the depression at the inlet valve

Check that the depression value measured at the

inlet valve corresponds with that at the inlet of the

testing vacuum cleaner. If the tubes and the fittings

have been glued in a perfect way, the values will

coincide.

Please notice: if the measured values do not

correspond, there is an air infiltration in the tubing.

1. Locating the origin of the whistles

Follow systematically the pipe line and check if it is

damaged. At the same time, listen if there are any

whistles. If this check does not provide any

successful result, use the stethoscope (part of

Disan’s testing kit) to listen systematically along the

tubing for whistles; in particular where fittings and

tubes have been glued. Even the minimum loss

produces irritating noises!

2. Repair the tubing

If necessary, replace the tube or the fittings so that

the tubing is perfectly tight.

Repeat the testing of the system.

After carrying out the test successfully, Disan

suggests giving to the purchaser or to the chief of

works a copy of the certificate (see second-last

page of this handbook) and of the tubing distribution

in order to avoid disputes or future liabilities.

5. Insertion of the vacuum gauge

Insert the vacuum gauge directly into the inlet

socket mounted on the vacuum cleaner.

Z 203

Z 204