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Minimum / maximum volume
flow rate
The circulation pump of the chiller
generates a constant medium
volume flow rate; a pressure loss
in the system and in the chiller is
the result. The differential pres-
sure switch / flow monitor in the
chiller measures the medium pres-
sure loss through the evaporator
and switches off the unit in case
the minimum volume flow rate is
undershot.
In addition, a medium volume flow
rate that is too high must not be
exceeded (maximum volume flow
rate).
To guarantee a constant volume
flow rate, three way valves with a
bypass, a hydraulic switch for the
setup of a primary and secondary
circuit, or a bypass that depends
on the volume flow rate are re-
quired.
Pressure and temperature indica-
tors
The pressure and temperature in-
dicators to be installed in the inlet
and outlet on site are used to set
the medium volume flow rate. The
indicators should be lockable.
The chiller contains temperature
sensors in the medium inlet, me-
dium outlet, and condenser. Using
the controller, the sensor values
can be queried.
Line regulating valves
Using line regulating valves
provided on site, the individual
pressure losses calculated in the
pipe network design are adapted
to each individual unit in the
overall system. Due to the pressure
loss, the nominal volume flow
rates of the medium are adapted
to the required values.
Flow monitor / differential pres-
sure monitor
Flow monitors are used to monitor
the minimum medium volume
flow rate and are installed in the
standard version of units with the
medium storage tank (KWG...SP/
KWP...SP).
For units without a medium stor-
age tank (KWG, KWG...P, KWP,
KWP...P), flow monitors must
be installed on site and adjusted
according to the nominal volume
flow rate in the pipe network.
Electrically, the monitors must be
connected to the terminals pro-
vided in the switch cabinet (see the
separate wiring diagram).
Minimum medium volume, sys-
tem
A minimum medium volume of
the system of 4.0 l/kW per output
stage must not be undershot. For
units with a heat pump function
(KWP), a minimum medium vol-
ume of 6.0 l/kW is required.
To guarantee more constant tem-
peratures in the medium circuit,
higher volumes may be required.
Pressure switch for medium circuit
(only for KWG...SP and KWP...SP)
A pressure switch in the medium
circuit monitors the current me-
dium pressure and switches off the
circulation pump and thus the unit
when the plant pressure is too low.
For the adjustment of the circula-
tion pump, we recommend that a
main line regulating valve be pro-
vided in the vicinity of the unit.
NOTE
Guarantee of the minimum volume flow rate through a three-way valve
Correct
installation
Incorrect
installation
Two-way
valve
Three-way
valve
External medium storage tank for
KWG (...P) and KWP (...P)
For the KWG, KWG...P, KWP, and
KWP...P units, additional medium
storage tanks are required.
If, for example, the required out-
put of the cold water consumers is
considerably lower than the gener-
ated cooling capacity of the chiller,
we recommend that the medium
contents be increased. The me-
dium pipes, for example, could be
oversized or an additional storage
tank could be used to increase the
compressor operating time.
If the minimum medium volume
of the system is not reached, a
storage tank must generally be
provided.
27
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