15
7.6 Filling by use of the service tool (fill and drain
tool), item no. 1090551
– If the chilled ceiling module was drained via the
service tool, no modification to the tool ort he valve
are required. The chilled ceiling module can now
be filled through the connected hose.
– After having completed the filling operation, fit the
10 mm spanner to the service tool again and close
the insert by turning it clockwise (chapter 12.2, D).
– Remove the service tool and tighten the insert using
the 10 mm spanner (max. 10 Nm) (chapter 12.2,
C).
Filling via the system
– Close the valve by turning the insert clockwise with
a 10 mm spanner and tighten it (max. 10 Nm)
(chapter 12.2, C).
– Open the valve disc by turning a 4 mm spanner
clockwise.
– Refit the protection cap.
– The chilled ceiling module has to be bled.
7.7 Determination of the presetting value for
hydronic balancing of the installation
The flow rates and flow resistances of the individual
chilled ceiling modules result from the design calculation
for a chilled ceiling installation. Accordingly, the flow
rate q
m
and the pressure loss Δp for each ceiling
module have to be set exactly at the regulating valve
“Cocon 2TZ” to guarantee an even supply of coolant
to all modules.
To do so, the design point is searched for in the charts
11.1, 11.2, 11.3 or 11.4 (depending on the chosen kvs
value) with the help of the values ∆p and q
m
.The
required number of turns is taken from the chart and
the valve disc is opened accordingly at the
presetting of the regulating valve (procedure see chapter
7.2 “Presetting”).
7.8 Behaviour during low demand periods
For the regulation of the chilled ceiling installation
during low demand periods, the regulating valves
“Cocon 2TZ” have to be equipped with actuators (see
chapter 5.1) operating the valve inserts which vary the
flow rates of the coolant within the chilled ceiling
modules. The charts 11.5, 11.6, 11.7 and 11.8 illustrate
the operating range of the regulating valves depending
on the piston stroke for the four valve inserts (kvs =
0.13, kvs = 0.45, kvs = 1.0 und kvs = 1.8). It must be
observed that these values including the noise
characteristic lines 25 dB(A) and 30 dB(A) are only
valid for the presetting being fully open. This is why
the charts only give information on the operating range
of the regulating valves with maximum flow rates.
7.9 Control of the hydronic balance within the
chilled ceiling installation
Should a control of the flow values in the chilled ceiling
modules become necessary, this can be done by using
the pressure test points integrated in the regulating
valves. The measuring needles of the Oventrop
measuring system “OV-DMC 2” may be inserted into
these pressure test points.
Control with the help of the pressure loss chart
When measuring the differential pressure by use of
the measuring system “OV-DMC 2” (item no. 1069170),
the valve insert must be fully open as the valve seat
acts as measuring orifice. The measured pressure loss
Δporifice is entered into chart 4.1 and where this
intersects the characteristic line of the corresponding
valve insert, determines the actual flow rate. After that,
the actual flow rate can be read off.
The flow rate can also be directly read off the measuring
system “OV-DMC 2”. The characteristic lines are stored
in the flow-meter.
7.10 Correction factors for mixtures of water and
glycol
7.10.1 Calculation with given flow rate
When antifreeze liquids are added to the coolant, the
pressure loss obtained from the chart must be multiplied
by the correction factor f (chart 7.1).
Δp
mixture
= Δp
chart
∙ f
7.10.2 Calculation with given or measured pressure
loss
When antifreeze liquids are added to the coolant, the
measured pressure loss must be divided by the
correction factor f.
Δp
chart
= Δp
mixture
: f
7.10.3 Calculation with measure flow rate
(q
m measured
) with “OV-DMC 2”
q
m
mixture
= q
m measured
: √f
