Panasonic PAW280MAH2 Instrucciones de operaciones descargar pdf (Pagina 35)

Product description

Technical data and limitations – PACi systems (cont.)

AHU Kit PAW-280PAH2(L)

Outdoor unit PACi Elite 3-phase U-200PE1E8 U-250PE1E8

Nominal cooling capacity kW 20.0 25.0

Nominal heating capacity kW 22.4 28.0

Air volume (Cooling) Min (factory) m³/h 1,680 2,280

Max (factory) m³/h 3,960 4,440

Air volume (Cooling),

subject to restrictions¹

Max m³/h 4,300 5,400

AHU DX coil heat

exchanger volume

Min (factory) dm

2.3 2.7

Max (factory) dm

4.3 4.3

AHU DX coil heat

exchanger volume,

subject to restrictions

Max dm

5.7 7.1

Additional ref. charge kg/dm

0.9 0.9

Max. additional

refrigerant charge

kg 1.25 2.51

Max. pipe length m n/a n/a

Max. ambient temp.

for pump down

°C n/a n/a

Heat exchanger front

area

Min m

0.54 0.66

Max m

1.0 1.0

Power source V / ph / Hz 230 / 1 / 50 230 / 1 / 50

Dimensions (enclosure) H x W x D mm 278 x 278 x 180 278 x 278 x 180

Net weight Advanced / Light kg 4.25 / 4.53 4.25 / 4.53

Protection class IP65 IP65

Piping length Min / Max m 5 / 70 5 / 70

Precharged length Max m 30 30

Additional refrigerant charge g/m 40 80

Piping connections Liquid pipe Inch (mm) 3/8” (9,52) 1/2” (12,7)

Gas pipe Inch (mm) 1” (25,4) 1” (25,4)

Intake temperature of

AHU Kit

Cooling (Min / Max) °C 18 / 32 °C DB 18 / 32 °C DB

(13 / 23 °C WB) (13 / 23 °C WB)

Heating (Min / Max) °C 16 / 30 °C DB 16 / 30 °C DB

Ambient temperature

(outdoor unit)

Cooling (Min / Max) °C -15 / 43 °C DB -15 / 43 °C DB

Heating (Min / Max) °C -20 / 15 °C WB -20 / 15 °C WB

1 This (higher) maximum allowed air volume is subject to a restriction of the “Intake temperature of AHU Kit” to

30 °C DB (instead of 32 °C DB). Without this restriction, only the (lower) factory-set maximum air volume is allowed.

2 This (higher) maximum AHU DX coil heat exchanger volume is subject to the following restrictions:

● an additional refrigerant charge on top of the additional refrigerant charge, which needed, when

pipe length exceeds the maximum allowed with standard shipment charge (see calculation example

below)

● AND a reduced maximum pipe length

● AND an ambient air temperature limit above which no pump down must be performed

Calculation example for total additional refrigerant charge

Unit: U-60PE1E5

Pipe length: 40 meter

AHU DX coil (supplied by AHU manufacturer): 1,7 dm

Refrigerant charge at shipment tted for pipe length within 30 m

Pipes additional refrigerant charge: 0,05 kg/m

AHU DX coil additional refrigerant charge: 0,9 kg/dm

Refrigerant charge at shipment tted for AHU DX coil volume within 1,4 dm

Total additional refrigerant charge calculation

((1.7 dm

– 1.4 dm

) x 0.9 kg/dm

) + (10 m x 0.05 kg/m) = 0.27 kg + 0.50 kg = 0.77 kg

Calculation example for number of passes in the heat exchanger

The minimum number of passes in the AHU heat exchanger is restricted. The limit is calculated

by the formula:

Minimum number of passes

= Number of steps × Distance between tube sheets × Number of rows × 1.5 × 10

–4

The calculated value must then be rounded up to the next integer number.

Example

Number of steps: 12

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 73 74

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Panasonic PAW280MAH2 Instrucciones de operaciones Pagina 35

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