Panasonic 140, Installation And Maintenance Manual, Page: 17 / 84

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10.3. Minimum water volume requirements
To ensure that the system operates correctly you must use suitably sized and properly routed pipes for the hydraulic links
between the ECOi-W and the main network. Proper operation of the control and safety devices is ensured only when the water
volume is suffi cient.
For cooling only operation, the total volume on the level of the primary water circuit must never below:
• application air conditioning
- 3,5 L/kW refrigeration power
• application process
- 10 L/kW refrigeration power
When utilising heating mode, a water volume equal to 6,5 L/kW is recommended, so that energy reserves are enough to ensure
the defrosting cycle without any discomfort for the end user.
If the total volume of the primary hydraulic circuit does not allow to reach these recommendations, a buffer tank or volumiser
must be added to the installation, to increase the water volume up to the minimum required value.
If the unit runs with a low volume of water (with air treatment plant…) or if it is used for industrial processes, a buffer tank or
volumiser is compulsory to guarantee suffi cient thermal inertia and satisfactory temperature stability.
A buffer tank can be required to increase the water volume of the whole hydraulic circuit in the system, so as to reach the
minimum water volume requested.
Internal buffer tank:
• 140/150/170/190/210 models: 300L
10.3.1. Cooling only operation
140 150 170 190 210
Minimum water volume in the system application air conditioning
L
469 515 565 658 731
Minimum water volume in the system application process 1 340 1 470 1 612 1 878 2 088
10.3.2. Heating operation
140 150 170 190 210
Minimum water volume in the system L 935 1 000 1 106 1 268 1 415
10.4. Maximum water volume requirements
The maximum water volume is limited by the sizing of the unit’s expansion tank and/or the expansion tank present in the
facility’s hydraulic circuit. Expansion tanks must be sized according to the glycol percentage in the hydraulic circuit.
The expansion tank should be installed at the pump suction, and the pressure inside will be adjusted by taking into account
the whole hydraulic circuit.
The volume of the expansion tanks selected with Single pump and double pump options are:
140 150 170 190 210
Volume of the expansion tank supplied with hydraulic options L 25 25 25 25 25
10.5. Rinsing the circuit
CAUTION
Before fi lling the installation, check it and remove any contamination such as sand, stone, welding chips
and other materials likely to damage the ECOi-W.
Fully rinse all water pipes before fi nal connection to the ECOi-W.
When using an off-the-shelf acid rinsing solution, implement a temporary branching around the ECOi-W to prevent damaging
internal components (particularly the plate exchanger, fl ow switch, pump...).