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Seal tightness
monitoring
After the connection is established,
the seal tightness check is
performed.
1. Rinse the system twice with
clean tap water.
2. Clean the sieve insert of the on-
site dirt trap.
3. Refill the system with water and
bleed the unit at the manual
bleeding valves.
4. Adapt the test pressure to min.
250 kPa (2.5 bar).
5. Check the established
connections for water leakage
after a period of at least 24
hours. If leakage is visible,
the connection has not been
correctly established. Tighten
the screw connections or
establish a new connection.
6. After a successful seal tightness
test, release the overpressure
from the medium lines in the
case of water/glycol mixtures or
adapt the standstill pressure to
the required system pressure.
Before Commissioning
Filling the system
The system is filled using the on-
site filling and bleeding port.
Anti-frost protection of medium
If a water/glycol mixture is used, it
should be added to the system in
pre-mixed form. The desired con-
centration must be checked again
afterwards.
Unit pre-pressure of medium
The medium pre-pressure (without
the operation of the circulation
pump) inside the system varies.
From the highest point, the pres-
sure increases with about 10 kPa
(0.1bar) per meter in height (geo-
detic height). The value measured
at the highest point is called the
standstill pressure.
During the determination of the
unit pre-pressure (pressure of the
on-site pressure gauge on the
unit), the arrangement of the unit
in the
system is decisive. The pressure
must be set to a minimum of 70
kPa (0.7 bar)
.
Bleeding the system
Air may still be located in the
pipelines after the seal tightness
check. This air is transported to
the next higher cold water con-
sumer through the operation
of the circulation pump. Here,
bleeding must be performed
once again (Fig. 8).
Bleed the pump as well, if nec-
essary.
After that, adapt the standstill
pressure to the required system
pressure.
If the unit is positioned at the
lowest point in the system, the
unit pre-pressure (= standstill
pressure + geodetic system
height) must be set to a mini-
mum of 70 kPa (0.7 bar) + 10
kPa (0.1bar) x geodetic system
height.
If the unit is positioned at the
highest point in the system,
the unit pre-pressure (= stand-
still pressure) must be set to a
minimum of 70 kPa (0.7 bar).
Please note that the system
pressure is increased by the
geodetic system height at the
lowest point!
8 Manual bleeder
Manual
bleeder
Unit pre-pressure
Geodetic
system height
Unit pre-pressure
Unit pre-pressure
Standstill pressure
35
35


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