Panasonic PAW-160MAH2L Installation Instructions Manual page 41

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Outdoor unit
U-60PEY2E5
U-71PEY2E5
U100-PEY1E5/8
U125-PEY1E5/8
U140-PEY1E8
U-50PE2E5
U-60PE2E5
U-71PE1E5/8
U-100PE1E5/8
U-125PE1E5/8
U-140PE1E5/8
U-200PE2E8
U-250PE2E8
Maximum allowed air volume flow
under "Standard conditions"
1 Air intake temperature entering the AHU DX coil heat exchanger
2 Special conditions A: Using an AHU unit with a higher maximum allowed air volume flow is subject to a restriction of the
"Air intake temperature" to 30 °C DB (instead of 32 °C WB under standard conditions).
3 Special conditions B: Using an AHU DX coil heat exchanger with a larger volume is subject to the following restrictions:
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Note: The AHU DX coil must be designed according to Panasonic specification.
Calculation example for total additional refrigerant charge (R410A)
Unit: U-60PE2E5A
Pipe length: 40 metres
AHU DX coil (supplied by AHU manufacturer): 1,7 dm
Refrigerant charge at shipment fitted for pipe length within 30 m
Pipes additional refrigerant charge: 0,04 kg/m
AHU DX coil additional refrigerant charge: 0,9 kg/dm
Refrigerant charge at shipment is sufficient for AHU DX coil volume up to 1,4 dm
Total additional refrigerant charge calculation
((1.7 dm
3
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
The calculated value must then be rounded up to the next integer number.
Example
Number of steps: 12
Distance between tube sheets: 1,000 mm
Number of row: 3
Minimum number of passes = 12 × 1,000 x 3 × 1.5 × 10
This value must be rounded up to 6.
This means that the minimum number of passes is 6 passes.
AHU Kit – Installation Instructions – 09/2021
Higher maximum allowed air volume flow under "Special conditions A
Maximum allowed air intake temperature at AHU DX coil heat exchanger in cooling mode is restriced to 30 °C DB.
an additional refrigerant charge (R410A), which is required irrespective of an additional refrigerant
charge which might be needed due to an extended piping length (see calculation example below)
AND a reduced maximum pipe length
AND an ambient air temperature limit above which it may not be possible to pump down the complete
refrigerant charge (including all additional refrigerant) into the outdoor unit.
– 1.4 dm ) x 0.9 kg/dm ) + (10 m x 0.04 kg/m) = 0.27 kg + 0.40 kg = 0.67 kg
3 3
Air volume flow m³/h
":
2
3
3
= 5.4
–4
Product description
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–4
41
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