GA 12.107/5.02 - 12/97
Installation
10
2.4 Coolant Connection
The compressor units are fitted with nipples to connect
the coolant circuit.
Do not confuse the inlet and outlet ports!
Remove the caps from the hose nipples.
Use hose clamps to attach the water hoses.
Use only hoses of sufficient pressure strength (at least
10 bar at 70
°
C/145 psig at 165
°
F).
Water quality
The compressor units are served by counterflow heat
exchangers.
To prevent calcium deposits in the heat exchanger, the
total of the alkaline earths (water hardness) should be
1.25 to 1.8 mmol/l.
1 mmol/l
= 5.5
°
d (German hardness scale)
= 7.02
°
e (English hardness scale)
= 10.0
°
f (French hardness scale)
= 5.85
°
a (American hardness scale)
The pH value of the cooling water should be between 6
and 8.
The water should be as free of suspended matter as
possible.
If there are suspended matter present in the coolant, we
recommend installing a water filter with a mesh size of
from 100 to 150 micrometers. The quantity of matter in
suspension downline from the filter shall be less than 10
mg/l.
In case of doubt, contact your water utility company or
Leybold for advice.
Obtain full information on the water quality before
connecting the compressor unit to a central recirculating
cooling water supply.
If water with properties deviating from specified values is
used, calcium deposits in the heat exchanger could
restrict the flow of water and adversely impact heat
removal.
Check the cooling water flow rate regularly.
Have the heat exchanger de-limed at regular intervals by
the Leybold Service Department.
To protect the heat exchanger against chemical attack,
fully demineralized or very soft water may be used only
with the addition of suitable inhibitors.
Add anti-freeze to the water if ambient and water tem-
peratures are below 5
°
C (40
°
F). If you use anti-freeze,
please consult Leybold as to the proper choice of agent.
The specific thermal capacity, viscosity, and the corros-
ive properties of coolant containing additives will differ
considerably from those for normal cooling water.
Coolant consumption
Note the values for coolant temperature, pressure and
flow rate given in Section 1.3 of the technical specifica-
tions and in Figure 5.
Check the coolant flow rate and temperature at regular
intervals.
Summary of Contents for RW 6000-1
Page 23: ...GA 12 107 5 02 12 97 Notes 23...
