34
GB
ENVIRONMENTAL CONDITIONS
• Allowed temperature range:
-15 °C ÷ +40 °C
• Allowed relative humidity range:
30 ÷ 90%
• Protection from atmospheric agents
CONNECTION
The piping to which the machine must be connected must have the following characteristics:
• Axiality among the delivery and
suction piping with minimum
diameters fit for the machine
• Distance between the two pipelines as
shown in the “Product specification”
paragraph “Foundations””
• Fastening to a fixed support, in order
not to discharge stresses and/or
vibrations on the machine
• Absence of air locks, as shown in the
piping figure
• Suction piping length reduced as
much as possible
• Load losses in the suction piping
minimised (if the machine works
in suction mode. See “Machines
installed above head”)
• Gates on delivery and suction pipe
lines
• If the machine is installed above head,
check valve on the suction piping
• If the machine feeds a boiler, check
valve on the delivery piping
• If the fluid circulating in the piping
has a temperature exceeding 65 °C,
protection against high temperatures
If the machine can work with a valve closed on the delivery piping, recycling piping for safeguarding the machine with the
following characteristics:
Connection between:
• Delivery and suction pipe lines
• Delivery and drain pipe lines
Control by mean of:
• Thermostatic valve
• Solenoid valve controlled by
pressure gauge or thermostat
POwER SUPPLY
The power supply mains must have the following characteristics:
• A differential protection
• Voltage and frequency values
matching the ones shown on the
machine motor rating plate
• A power output not lower than the
value shown on the machine motor
rating plate
• An electromagnetic switch having a fit
thermal protection
• A self-balanced thermal relay
adjusted on the basis of the actual
absorbed current
• A cut-off switch with protecting fuses
• Cables having a section fit for the
current absorbed by the motor.
ACCESS
Connect the machine in a place that can be easily accessed for maintenance operations.
Do not cover or obstructs the motor fan covering grid.
ATTENTION
PIPING ASSEMBLY
incorrect
correct
air locks
Summary of Contents for Nocchi VLR 16
Page 18: ...38 GB A B VLR 32...
