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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
3
2.3 2.7
Max (factory) dm
3
4.3 4.3
AHU DX coil heat
exchanger volume,
subject to restrictions
2
Max dm
3
5.7 7.1
Additional ref. charge kg/dm
3
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
2
0.54 0.66
Max m
2
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
1
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
3
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
3
Refrigerant charge at shipment tted for AHU DX coil volume within 1,4 dm
3
Total additional refrigerant charge calculation
((1.7 dm
3
– 1.4 dm
3
) x 0.9 kg/dm
3
) + (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
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