19
G
A vacuum with a minimum of 0.05 mbar must be
created!
G
If the length of the connection line is longer than 5
m, refrigerant must be added to the system during
initial operation.
See the section Adding Refrigerant.
Winter Regulation
Mechanism
To ensure that the system functions properly, the pres-
sure and temperature of the refrigerant must be kept
within the operating ranges in the indoor unit and outdoor
part.
The integrated winter regulation mechanism makes it pos-
sible to keep operating ranges constant even when outside
temperatures go as low as –7 °C and to maintain the
cooling and heating operation.
The temperature sensor mounted on the output line of
the condenser records the condensation temperature of
the refrigerant in cooling mode.
18. Place the control line in the same line guideway.
19. Install the outdoor part with the wall or base console
onto stationary building parts approved for this pur-
pose.
Observe the installation instructions for the con-
soles.
20. Make sure that no structure-borne sound is trans-
mitted to building parts.
Structure-borne sound can be reduced through vi-
bration absorbers!
21. Remove the protective caps supplied and the screw
caps of the shut-off valves and use these for contin-
ued assembly.
22. Before you flare the refrigerant lines, ensure that
there is a swivel nut on the hose.
Only use the preinstalled swivel nuts.
23. Connect the refrigerant lines to the outdoor part as
already described.
Impermeability Test
Once all connections have been made, the manometer
station is connected to the corresponding valve connec-
tions as described below:
red = small valve = injection pressure.
blue = large valve = suction pressure.
After the connection has been made, an impermeability
test is conducted using dry nitrogen.
The connections that have been established are
sprayed with a leak locator spray to test for imperme-
ability. Tighten the bolts more firmly or, if necessary,
create a new flare.
After this test has been successfully conducted, any ex-
cess pressure is removed from the refrigerant lines and
a vacuum pump is put into operation to create a vac-
uum in the lines.
We recommend using a two-speed vacuum pump with
an absolute final partial pressure of at least 0.01 mbar
at a pump capacity of a minimum of 1.5 m
3
/h.
How long it takes to create the vacuum is based on the
hose line volume of the indoor unit and the length of the
refrigerant lines. However, this process takes a mini-
mum of 30 minutes.
Once foreign gases and moisture have been completely
removed from the system, the manometer station
valves are closed and the valves of the outdoor part are
opened as described in the section "Initial Operation".
The regulating mechanism controls the operating cur-
rent of the condenser fan by adjusting the current to the
required condensation temperature.
The winter regulation mechanism gradually adjusts the
condenser ventilator’s motor speed depending on the
operating pressure of the system and outside tempera-
ture.
For this reason, the rotating motion of the ventilator can
be completely discontinued in winter.
Temperature sensor
Winter regulation mechanism
