Air consumption divided by compressor free air
delivery
Correction factor C
0.9 0.10
0.8 0.15
0.7 0.20
0.5 0.25
0.3 0.20
0.2 0.15
0.1 0.10
4. The inlet grids and ventilation fan should be installed in such a way that any recirculation of cooling
air to the compressor is avoided. The maximum air velocity through the grids is 5 m/s (16.5 ft/s).
The required ventilation capacity (per compressor installed) to limit the compressor room temperature
can be calculated as follows:
For ZR compressors:
• For SI Units: Qv = 0.1 N/dT
• For British/American Units: Qv = 284.5 N/dT
For ZT compressors:
• For SI Units: Qv = 0.92 N/dT
• For British/American Units: Qv = 2617.4 N/dT
Symbol Explanation
dT Temperature increase in compressor room
• For SI Units: in °C
• For British/American Units: in °F
N Shaft input of compressor
• For SI Units: in kW
• For British/American Units: in hp
Qv Required ventilation capacity
•
For SI Units: in m
3
/s
• For British/American Units: in cfm
If cooling air ducts are installed, the maximum allowable pressure drop over the ducts is 30 Pa (0.12
in wc). Common ducting for several compressors is not allowed.
5. Lay out the drain piping from the condensate outlets towards the condensate collector. The drain
pipes must not dip into the water in the collector. It is recommended to provide a funnel to allow
visual inspection of the condensate flow.
6. Elektronikon control system with control panel.
7. See Electric cable size, fuses and cable length for the recommended size of the supply cables.
Check that the electrical connections meet local codes. The installation must be earthed and protected
against short circuits by fuses in all phases. An isolating switch must be installed near the compressor.
8. Install a condensate drain valve in the lower part of the air net piping.
9. On ZR compressors, remove the plastic plugs (if fitted) from the compressor water pipes (WI and
WO) and connect the pipes to the cooling water circuit. Fit a valve in the compressor water inlet pipe
and outlet pipe.
10. Extra grating for compressors equipped with the separate air intake and/or prefilter option(s).
11. Energy recovery water supply.
Instruction book
2920 1815 04 205
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