Rittal Liquid Cooling Package
19
3 Device description
EN
3.6.2
Dewpoint control
A dewpoint control must be installed on the LCP Inline
(3311.538/568), the LCP Inline flush (3311.148/548)
and on the 60 kW version of the LCP Rack (3311.268).
This form of control depends on the components and
settings of the complete facility and therefore varies
from case to case. If there already is a cooling unit that
controls the air humidity of the room, additional dew-
point control is not necessary in the majority of cases,
since this cooling unit already regulates the humidity
according to the recommendations of the ASHRAE
standard "ASHRAE TC9.9, 2011 Thermal Guidelines
for Data Processing Environments". If the dew point is
to be regulated by the LCP Inline or the LCP Inline
flush itself, there are two regulation types available
with the same additional scope of installations. First, a
temperature/humidity sensor (7030.111) needs to be
installed into the outlet side of the LCP Inline or
LCP Inline flush. It is easily mounted on the TS 8 frame
and effortlessly connected to the CMC III PU of the
LCP Inline or LCP Inline flush. The alert triggering
range for a humidity of
≤
95% should then be set via
the web interface (see assembly and operating in-
structions of the CMC III Processing Unit or the sen-
sor).
The following can be selected in the "Tasks" section in
case of an alarm: either the fans are switched off (At-
tention! Cooling capacity is no longer guaranteed), or
the integrated regulating valve is closed, thereby rais-
ing the temperature of the heat exchanger above the
dew point. These solutions may, however, cause a
failure or decrease in cooling capacity.
The facility must have an independent dew point mon-
itor if you do not opt for internal control.
A dew point regulator installed in the plant mainly de-
pends on the way in which the LCP Inline or LCP Inline
flush is supplied with cold water.
Generally speaking, the dew point monitor should be
installed on the outlet side of the unit. Upon approach-
ing the dew point, it must be capable of raising the in-
let temperature of the cold water or deactivating the
cooling via a controller.
