Preparing The Air-Conditioner For Operation; Performing Vacuum In The Indoor Unit And In Tubes - Electra DNC series Service Manual

INSTALLATION MANUAL
Table 2. Setting the height "A" of the tube protrusion (outer tube diameter in inches)
8.

Preparing the air-conditioner for operation

The advanced steps to prepare the air-conditioner for operation are critical in guaranteeing the
appropriate operation of the air-conditioner for a long time; adhere meticulously to the following
steps:
•
Make sure that the connecting tubes are clean of dirt and moisture. If necessary, rinse
and clean with ammonia before connecting the units.
•
Release the nuts in the indoor unit only when you are ready to connect the tubes! (The
indoor unit contains a small amount of gas and is under pressure).
•
In order to prevent possible breakage of the tubes, and to receive maximal diameter the
tubes must be bent by means of a special bending tool specifically designed for bending
copper tubes.
8.1

Performing vacuum in the indoor unit and in tubes

A. Connect the flare nuts to the suitable connectors in the units (see Fig. 25).
B. Connect two charging tubes with the ends without locking pins to the pressure gage
connection in the manifold. Connect the other two ends of the tubes, with locking pins, to
the service opening on the suction tap and the liquid tap (see Fig. 25).
Note:
In units, where there is no service valve in the liquid tap, connect the tube to the suction tap only
(the service valve in the liquid tap is supplied only in certain units).
C. Connect the charging tube from the middle connection of the manifold to the vacuum
pump.
D. Activate the vacuum pump (service taps are closed); make sure that the suction
pressure gage moves between 0 cm-Hg to 76 cm-Hg, and enable the system to perform
the vacuum operation for 10 minutes.
Warning:
If the pressure gage does not show movement from 0 cm-Hg to 76 cm-Hg, it testifies that the
system is not sealed off. The following action must be taken: tighten all connections. If the
leakage was corrected after tightening the connectors, continue working according to the
following steps. If leakage was not corrected after tightening the connectors, find the location of
the leakage (by means of soapsuds) and correct as necessary. Continue the process
according to the following steps only after correcting all signs of leakage.
A (mm) Outer tube diameter (inch)
1.3
1.6
1.9
2.1
English 21
CONTENT
3/8"
1/2"
5/8"
3/4"