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POWERCIAT LX ST/HE/XE
7.3 - Flow control
Evaporator flow switch and chilled water pump interlock
IMPORTANT: On LX ST/HE/XE units, the water flow switch
must be powered up. Failure to follow this instruction will
invalidate the CIAT warranty.
The water flow switch is installed on the evaporator water inlet
and adjusted by the control, based on unit size and application.
If adjustment is necessary, it must be carried out by qualified
personnel trained by CIAT Service.
7.4 - Tightening the evaporator water box
bolts
The evaporator (and condenser) are of the shell and tube type
with removable water boxes to facilitate cleaning. Re-tightening
or tightening must be done in accordance with the illustration
below.
Water box tightening sequence
Key:
1
Sequence 1: 1, 2, 3, 4
2
Tightening torque
Sequence 2: 5, 6, 7, 8
Bolt size M16 - 171 - 210 Nm
Sequence 3: 9, 10, 11, 12
Sequence 4: 13, 14, 15, 16
NOTE: Before this operation we recommend draining the
circuit and disconnecting the pipes to be sure that the bolts
are correctly and uniformly tightened.
7.5 - Frost protection
7.5.1 - Standard machine
If the chiller or the water piping is in an area where the ambient
temperature can fall below 0 °C it is recommended to add an
antifreeze solution to protect the unit and the water piping to a
temperature of 10 K below the lowest temperature likely to be
reached at the installation site. Use only antifreeze solutions,
approved for heat exchanger duty. If the system is not protected
by an antifreeze solution and will not be used during the freezing
weather conditions, draining of the cooler and outdoor piping is
mandatory. Damage due to freezing is not covered by the
warranty.
IMPORTANT: Depending on the climatic conditions in your
area you must:
• Add ethylene glycol with an adequate concentration to protect
the installation up to a temperature of 10 K below the lowest
temperature likely to occur at the installation site.
•
If the unit is not used for an extended period, it is
recommended to drain it, and as a safety precaution add
ethylene glycol to the heat exchanger, using the water
entering purge valve connection (a purge connection is
available somewhere on the heat exchanger water box in
case the machine is not perfectly level).
•
At the start of the next season, refill the unit with water and
add an inhibitor.
•
For the installation of auxiliary equipment, the installer
must comply with basic regulations, especially for
minimum and maximum flow rates, which must be between
the values listed in the operating limit table (application
data).
7.5.2 - Optional evaporator frost protection
In cases where it is not possible to apply the recommendations
in paragraph 7.5.1, the units can be equipped with heaters to
protect the evaporator against freezing (option).
7.6 - Operation of two units in master/slave
mode (option)
The control of a master/slave assembly is in the entering water
and does not require any additional sensors (standard
configuration). It can also be located in the leaving water. In this
case two additional sensors must be added on the common
piping.
All parameters, required for the master/slave function must be
configured using the Service Configuration menu. All remote
controls of the master/slave assembly (start/stop, set point, load
shedding etc.) are controlled by the unit configured as master
and must only be applied to the master unit.
Each unit controls its own water pump. If there is only one
common pump, in cases with variable flow, isolation valves must
be installed on each unit. They will be activated at the opening
and closing by the control of each heat pump (in this case the
valves are controlled using the dedicated water pump outputs).
Refer to the optional POWERCIAT Connect’Touch control manual
for a more detailed explanation.
7 - WATER CONNECTIONS
