Panasonic Aquarea WH-SDC09H3E5-1 - 5.3 Hydraulics; 5.3.1 Hydraulic integration

192 Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
Installation
193
Aquarea air-to-water heat pumps - Planning and installation manual - 01/2018
Installation
Schematic Representation of System Evacuation
Lo
Hi
1
2
3
4
5
6
78
9
10
1 Hydro-module
2 Fluid line
3 2-way valve, closed
4 Outdoor unit
5 3-way valve, closed
6 Hot gas pipeline
7 CLOSED
8 OPEN
9 Adapter of the vacuum pump
10 Vacuum pump
Endangerment of the environment due to leaking coolant
To keep the endangerment of the environment to a minimum, no coolant must be emitted to the
environment when working on the cooling circuit.
► While working on the cooling circuit, ensure through suitable measures that no coolant
is emitted to the environment.
► Suck out the coolant present in the system by means of a suction station and dispose
of it professionally according to the provisions in force.
Carry out the following steps to evacuate the system:
1. Connect the lling hose to the low pressure side of the manometer station and to the
service port of the 3-way valve, as shown in the illustration (see above). See that the end
of the lling hose is connected with the service port with the pin.
2. Connect the central hose of the manometer station to a vacuum pump with a non-return
valve or to a vacuum pump with adapter.
3. Switch on the vacuum pump until the pressure has dropped to a measured value of -1
bar. Evacuate the system for about 30 minutes.
4. Close the valve on the low pressure side of the manometer station and switch off the
vacuum pump.
5. Recheck whether the measured value remains constant at -1 bar for 10 minutes.
Yes: In this case you can assume that the cooling circuit is tight and go directly to step 7.
No: In this case, there is presumably still a leakage in the coolant circuit. Remove the
leakage by performing step 6.
6. If the manometer display does not remain constant at -1 bar, rst tighten the connections.
Then evacuate the system again as described above. If the measured value of -1 bar is
still not maintained, search and repair the leaking places and then again perform step 5,
until the cooling circuit is denitely tight.
7. If the manometer display shows -1 bar for 10 minutes, loosen the hose from the vacuum
pump and the service port of the 3-way valve.
8. Tighten the end cap on the service port of the 3-way valve by means of a torque wrench
with a torque of 18 Nm.
9. Remove the valve caps on the valve spindles of the 2-way and 3-way valves.
10. Open both the valves completely by using a hexagonal spanner (SW 4) so that the
coolant streams into the system. Check that the coolant quantity is sufcient, otherwise
top up with the requisite coolant quantity (→ 4 Technical data (split systems), p. 16,
→ 4.6.3.3 Technical data (compact systems), p. 50).
11. Screw the valve caps back on the valve spindles of the 2-way and 3-way valves.
12. Examine the connections for leakage.