5.6 Oil return measures
If the outdoor unit is installed at a higher level than
the indoor unit, suitable oil return measures must
be taken. Usually, an oil pump bend is installed for
every 7 metres of height difference.
1
A
B
2
Fig. 32: Oil return measures
AT: Outdoor unit
IT: Indoor unit
1: 1 x oil pump bend in suction pipe to outdoor
unit every 7 metres of height difference,
radius: 50 mm
2: Max. 10-15 m
6
Installation
6.1 Unit installation
NOTICE!
Installation should only be performed by author-
ised specialists.
The unit is mounted with the cover facing down on
four threaded rods. Take into account the ceiling
grid and any other installations.
1.
Use the dimensions of the ceiling cassette to
mark the fixing points for the threaded rods
on structural parts approved to support the
static load above the suspended ceiling
2.
Fit the indoor unit onto the threaded rods and
use the lower nuts to level the unit (Fig. 34).
3.
Adhere to a ceiling clearance of at least 30
mm. Connect the refrigerant piping, electrical
cables and condensate drainage line to the
indoor unit as described below.
4.
Check again that the unit is level.
5.
The final task is to tighten the counternuts
and attach the cover.
A
B
Fig. 33: Hooking in the unit
Indoor units
(all dimensions in mm)
Measure-
ment A
Measure-
ment B
RVD 354-524 DC
545
523
RVD 684-1054 DC
780
680
29
