Minimum/maximum medium flow
The circulating pump generates a
constant medium flow; the result
is a loss of pressure in the system
and in the chiller.
The flow switch in the chiller
measures the medium pressure loss
over the evaporator and switches
the unit off if the minimum
medium flow is to low.
The medium flow limit may not
be exceeded (maximum medium
flow).
A Three-way-valve with bypass
and a hydraulic switch to establish
a primary and secondary cycle or a
volume dependent bypass is nec-
essary to ensure a constant flow
volume.
Valve for hydronic balancing
The calculated individual
pressure losses in the pipeline
network layout for each individual
unit are adjusted to the entire
system with the valves for
hydronic balancing to be provided
on-site. The nominal flow volumes
for the medium adjust to the
necessary values as a consequence
of the pressure loss.
Pressure gauge and thermometer
The pressure gauge and thermom-
eter to be installed on-site at
the intake and outlet serve to set
the medium flow. The display
should mean shut down In the
system there are temperature
sensors in the medium intake and
medium outlet.
The temperature at the probes can
be seen on the controller.
Medium lines
Medium lines can be made of cop-
per, steel or plastic. To minimise
pressure losses, only straight flow
through fittings should be used.
When designing the layout it must
be taken into account, the large
flow volumes in the systems, high
pressure losses in connection with
water-glycol mixtures and the
chiller’s minimum medium flow.
The lines are to be insulated
against vapour density and the
current Energy- Savings-Regu-
lations (EnEV) or other local law
must be observed. UV resistance
material must be used outdoors.
During use and disposal,
product and safety data sheets
for the glycol type being used
as well as applicable local
regulations (e.g. Water
Resources Law) must be
observed.
!
CAUTION
Use the required type and
mixture to set the antifreeze
setpoint.
!
CAUTION
To regulate the circulation pump
we recommend a main valve
for hydraulic balancing near the
unit.
NOTE
Minimum medium volume of the
system
A minimum medium volume in the
system may not fall below
3.5 l/kW per power stage.
Ensuring the minimum medium flow
Correct
installation
Incorrect
installation
2-way
valve
3-way
valve
Frost protection (accessories)
As a medium for a chilled water
system, a water-glycol mixture
is used as a rule. Depending on
the use to which the glycol type
and quantity is put, the viscos-
ity changes, the loss in pressure
increases and the unit’s cooling or
heating capacity reduces. All sys-
tem components must be suitable
for use with glycol.
As a rule, the addition to the water
of ethylene glycol, in a proportion
of 34%, with inhibitors for corro-
sion protection is recommended.
23
Summary of Contents for RVS 100H INOX
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