UK VRF GEN 24 - Flipbook - Page 77
VRF SYSTEMS
VRF SYSTEMS INDEX
The Pump Down systems are ideal for hotels, offices and public buildings where safety of building
occupants is a must.
Signal
Leakage!
Signal
Signal
Direct leak detection method: the safest solution for small rooms
The leak detector is connected directly to the indoor unit
and the Pump Down system is directly connected to the
outdoor unit PCB. The Pump Down system will activate
when a leak is detected in the room and initiate a
refrigerant reclaim operation immediately. This immediate
reaction, and large refrigerant storage capacity, offers very
high levels of safety for end users, building occupants, as
well as being environmentally friendly.
No additional communication panels or software is
required. This option should be implemented in any area
that is not compliant with BS EN 378.
Room 1
Room 2
Leak
detector
Indirect leak detection method: Unique PLC algorithm to determine refrigerant leakage
Pressure and temperature sensors constantly monitor the high / low pressure and discharge of the condensing unit to
protect against potential leakage in areas not covered by leak detectors.
The innovative algorithm is able to detect leakage of R410A based on abnormal changes in the following conditions, high
and low pressure, and compressor discharge temperature.
Once initiated via either direct or indirect detection, the unit will immediately close the liquid / discharge actuating ball
valves, close the alarm terminals on the Pump Down PCB allowing an alarm to be raised at any nominated location.
Reclaim of the refrigerant is via the suction line to the heat exchanger(s) of the outdoor unit(s), with any surplus
refrigerant collected in the 30 l receiver tank. Once fully pumped down the suction line is closed and the unit awaits a
‘Reset’ and ‘Recharge’ command.
Thanks to the simple installation and control, shown in Fig 1, Panasonic’s ECOi Pump Down system can provide dramatic
reduction in capital cost and installation time when compared to a standalone leak detection system, shown in Fig 2.
Fig 1: Panasonic’s Pump Down system.
Fig 2: Standalone leak detection system.
Quick and simple installation
The unit contains actuating ball valves, a 30 L storage vessel and PLC all housed in an IP54 rated encasement. Terminals
in front of the unit allow easy wiring to the alarm terminal, high / low pressure transducers and discharge temperature
sensor(s) of the condensing unit(s).
Reference
Description
PAW-PUD2W-1R
Pump Down system (2 way) for 1 outdoor unit
PAW-PUD2W-2R
Pump Down system (2 way) for 2 outdoor units
PAW-PUD2W-3R*
Pump Down system (2 way) for 3 outdoor units
PAW-PUD3W-1R
Pump Down system (3 way) for 1 outdoor unit
PAW-PUD3W-2R
Pump Down system (3 way) for 2 outdoor units
PAW-PUD3W-3R*
Pump Down system (3 way) for 3 outdoor units
* Special order requiring the longer lead time than usual. For the detailed information, please contact an authorized Panasonic dealer.
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