52
F
Shut-off valve
G
Liquid line
H
Fill hose between pressure gauge set and outdoor
unit
K
Pressure gauge set
L
Connection hose between pressure gauge set and
vacuum pump
M
Vacuum pump
N
Connection hose between pressure gauge set and
vacuum gauge
P
Valve for vacuum gauge
Q
Vacuum gauge
!
Please note
Overpressure will damage the vacuum gauge.
Never subject the vacuum gauge to positive
pressure.
1.
Close all valves at the pressure gauge set.
2.
Make all connections, as shown above.
Note
■
Fill valve
E
must
remain closed.
■
Ensure that fill hose
H
and shut-off valve
F
are
last
to be connected to service valve
D
.
■
Shut-off valve
F
must
be open.
■
For
all
connections, counterhold with a second
open-ended spanner.
3.
Start the vacuum pump.
At the pressure gauge set, open the valve to the
vacuum pump and the valve to the hot gas connec-
tion.
4.
After approx. 5 min, open the valve to the vacuum
gauge.
Leave the vacuum pump running until the indica-
tion on the vacuum gauge is almost at "0" (at least
30 min).
Note
The vacuum pump runtime will depend on the
ambient conditions.
5.
On the pressure gauge set, close the valve to the
vacuum pump.
Stop the vacuum pump and wait approx. 5 min. If
the indication on the vacuum gauge rises, there is
a leak.
Eliminate the leak and repeat the process.
6.
Close all valves at the pressure gauge set.
7.
Remove the vacuum pump and vacuum gauge.
Charging the refrigerant lines and indoor unit
Note
■
The outdoor unit is pre-charged with refrigerant
R410A.
■
No additional charging is required for line lengths
from 3 to 12 m.
■
For lengths of refrigerant lines, see page 23.
■
The system may only be recharged with refrigerant
R410A in a
liquid state
.
Danger
Direct contact with refrigerant can cause skin
damage.
Wear safety goggles and protective gloves when
working on the refrigerant circuit.
!
Please note
Topping up the system with refrigerant or evacu-
ating the refrigerant can cause the condenser to
freeze up.
Flush the secondary side of the condenser with
water or drain it completely.
!
Please note
Mechanical stress will damage the connections.
For
all
connections, counterhold with a second
open-ended spanner.
Line lengths 3 to 12 m:
1.
Close shut-off valve.
2.
Undo the caps from the fill valves of the external
unit. Open both fill valves and refit caps.
Note
Both fill valves must be open when the appliance is
switched on.
3.
Promptly undo the fill hose and shut-off valve from
the service valve of the external unit: The pressure
in the pipework must be greater than ambient pres-
sure.
4.
Fit the union nut with copper cap to the service
valve of the external unit: Torque 15 to 20 Nm.
Commissioning, inspection, maintenance
Evacuating the refrigerant lines and indoor unit
(cont.)
5776 028 GB
Summary of Contents for AWT 221.A04
Page 77: ...77 Maintenance Checking the fuses cont 5776 028 GB Maintenance...
Page 87: ...87 Indoor unit parts lists Indoor unit hydraulics cont 5776 028 GB Components...
Page 90: ...90 Indoor unit parts lists Indoor unit cylinder cont 5776 028 GB Components...
Page 137: ...137 Wind direction 11 Wind loads 11 Keyword index Keyword index cont 5776 028 GB...
Page 138: ...138 5776 028 GB...
Page 139: ...139 5776 028 GB...
