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Diaphragm expansion vessel
To prevent pressure fluctuations
during standstills due to
temperature changes, diaphragm
expansion vessels with a nitrogen
filling (moisture-neutral) must be
integrated into the system.
The standard version of the
KWG...P, KWG...SP, KWP...P,
and KWP...SP units include a
diaphragm expansion vessel. The
volume of these diaphragm expan-
sion vessels are designed only for
those units. The system requires an
additional diaphragm expansion
vessel designed for this system.
An individual design is required for
the KWG and KWP units.
The calculation can be performed
with roughly 5 to 10% diaphragm
expansion vessel volume of the
system volume.
The pre-pressure of all diaphragm
expansion vessels must be set on
the system.
Safety valve 6.0 bar
Safety valves limit an operating
pressure that is too high due to ex-
cessive heating or an overfilling of
the operating medium. The valve
outlet requires a free feed into a
drain line. When glycol is used, the
local disposal regulations must be
observed.
The standard version of the unit
includes a safety valve.
Bleeding valves
The unit has manual bleeding
valves. After the filling of the
system, the unit can be bled here
separately. In addition, automatic
bleeding valves must be mounted
at the highest point of the collec-
tive line.
When media containing glycol
are used, glycol-resistant
bleeding valves must be used.
ATTENTION
Capacitors
In order not to transmit the
vibrations of the chiller to the
system parts, we recommend the
use of capacitors to connect the
lines to the unit, in addition to
Victaulic connectors.
Capacitors
Shut-off valve Capacitor
Static
fastening
KWG connection
Shut-off valves
In cold water systems, shut-off
valves with full throughput should
fundamentally be used. For
servicing purposes, the medium
inlet and medium outlet must be
equipped with shut-off valves
(with safety valve, if required).
Circulation pump for KWG and
KWG...SP
For units without a storage tank,
an external circulation pump is
required for the implementation
of the nominal volume flow rate
within the chiller!
Actuation takes place via the ter-
minal strip using a controller of the
chiller.
Incorrectly installed or missing
dirt traps can cause a soiling of
the plate heat exchanger.
ATTENTION
Filling and bleeding connection
A connection for bleeding the
pipelines (especially when water
is used as the medium) should be
provided in the anti-frost-protect-
ed area. When glycol is used, the
local disposal regulations must be
observed.
Dirt trap
A rinsable dirt trap must be in-
stalled in front of the unit inlet.
The mesh size should not exceed
10 meshes/cm². Shut-off valves
should be used upstream and
downstream of the dirt trap.
If the minimum medium volume
flow rate of the system is under-
shot, malfunctions may result.
NOTE
Anti-frost protection (accessory)
A water/glycol mixture is usu-
ally used as the medium of a cold
water system. According to the
glycol type and amount used, the
viscosity changes, the pressure
loss increases, and the dissipated
cooling and/or heating capacity
of the unit decreases. All system
components must be released for
use with glycol.
In general, we recommend that
34% ethylene glycol with in-
hibitors for corrosion protection be
added to the water. This concen-
tration guarantees anti-frost safety
up to –20°C; at lower tempera-
tures, an ice slush that no longer
has a bursting effect arises.
If the medium could come into
contact with drinking water or
food, a toxicologically harmless
medium based on propylene glycol
must be preferred.
REMKO KWG
28
28


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