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11. First manually connect the refrigerant lines with the
shut-off valves to ensure that they are in the proper
position.
Check that the suction and pressure lines of the
cold cycle have been correctly allocated!
12. Now tighten the bolts using 2 wrenchs with a suffi-
ciently wide opening.
Use a second wrench to apply counterpressure
when tightening (see figure)
spanner 1
Tighten
13. Insulate both the installed refrigerant lines and the
connector against heat.
14. Only use insulation hoses suitable for this tempera-
ture range that are sealed against diffusion.
Additional installation instructions
◊
When the outdoor part is used in combination with
various other indoor units, the connection to the re-
frigerant lines can be different. If this is the case, at-
tach the reduction or expansion fittings supplied to
the indoor unit.
If the length of the connection line is longer than
5 m, refrigerant must be added to the system dur-
ing initial operation.
See the section entitled "Adding Refrigerant"
Oil recirculation
If the outdoor part is set up at a higher level than the in-
door unit, appropriate steps must be taken for oil recir-
culation.
Oil elevation arc in the suction
line to the outdoor part
1x for every 2.5 meters of line
going up
Radius:
50 mm
This is usually accomplished by creating an oil elevation
arc that is installed every 2.5 meters of line going up.
10
Apply counter- pressure
spanner 2
Outdoor part
max. 10 m
Indoor unit
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
blue =
large valve
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 with an absolute final partial pressure
of at least 0.01 mbar is put into operation to create a
vacuum in the lines. This also removes any moisture
from the lines.
A vacuum with a minimum of 0.05 mbar must be
created!
How long it takes to create the vacuum is based on the
pipe 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".
Condensation
Because temperatures below the dew point are
reached, condensation forms during heating operation
on the plate fin exchanger of the outdoor part.
The lower housing case of the outdoor part is designed
to function as a drain tray. Beneath the condenser, there
is an opening where the condensation can drain out.
If the unit is used for heating in areas susceptible to
frost, the lower housing case must be kept free of frost
to ensure that the condensation can always drain out.
Condensation can also be drained via alternative routes
using the supplied condensation hose. When laying the
condensation hose, you must observe the following:
◊
Make sure that there is an adequate incline for
drainage.
Minimum of 2 %.
◊
When the unit is in operation at an outside tempera-
ture of below 0 °C, the hose must be protected
against frost.
If necessary, use a hose heating mechanism.
◊
Always use suitable hose clips.
◊
After the hoses have been put into place, you must
check that the condensation flows freely.
= injection pressure.
= suction pressure.
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