15
For the capacities 20,000 to 30,000 Btu/h, the expansion is performed via a capillary located
in the outdoor unit.
For 40,000 Btu/h and above, the expansion is performed in the indoor unit by means of a
system called the “piston”.
The expansion system kit accompanies the
indoor unit models 40, 50 and 60,000 Btu/h and
must be positioned in the indoor unit
according to the adjacent illustration.
6
EXPANSION SYSTEM
This system with a piston according to Fig. 22 contains a small part with a fixed calibrated
orifice which is easily removed, on the inside of a nipple for connecting the 3/8" flange nut to
the fluid pipe.
The application characteristics of the PISTON are used due to the more precise content of the
mass flow of refrigerant gas to the inside of the indoor unit compared to the capillary pipe system,
for example. In addition to this, the PISTONS are easy to maintain.
NOTE
Fig. 21 - Installing the expansion system kit
Fig. 22