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7 - WATER CONNECTIONS
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 instal-ler
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 (30XAS)
If it is not possible to apply the recommendations in para-graph
7.5.1, the units can be equipped with heaters to protect the
evaporator against frost (option 41A or 41B).
22
7.6 - Operation of two units in master/slave
mode (option 58)
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 config-ured 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 unit (in this case the valves are controlled using
the dedicated water pump outputs). See the 30XA/30XAS/30XW
Touch Pilot control manual for a more detailed explanation.
30XAS with configuration: leaving water control
1
Legend
B
Master unit
C
Slave unit
Control boxes of the master and slave units
Water inlet.
Water outlet
Water pumps for each unit (included as standard for units with hydraulic
module)
Additional sensors for leaving water control, to be connected to channel 1 of
the slave boards of each master and slave unit
CCN communication bus
Connection of two additional sensors
2
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