Pentair DHR Series Instruction Manual page 28

EN
ENVIRONMENTAL CONDITIONS
•
Acceptable temperature range:
+7 °C ÷ +50 °C
CONNECTION
The pipes used to connect the machine should have the following characteristics:
•
Minimum diameters with dimensions
suited to the machine
•
The distance and position of the
two pipes should comply with the
indications given in
"Product specifications", paragraph
"Dimensions and weights"
•
Anchoring to fixed support in order not
to exert tension and/or vibrations on
the machine
If the machine is designed to operate with a closed valve on the delivery line, a recirculation pipe should be provided for protection
purposes. The pipe should have the following characteristics:
Accumulated air
POWER SUPPLY
Electric power supply should have the following characteristics:
•
Offer a differential protection
•
Offer voltage and frequency values
compliant with the values indicated on
the motor nameplate
•
Offer a power not below the value
indicated on the motor nameplate
ACCESS
Connect the machine so that it can be easily accessible for maintenance operations.
26
•
Acceptable relative humidity range:
30 ÷ 90%
•
Lack of air locks, as shown in the
piping figure
•
Suction pipe length reduced to a
minimum
•
Load losses in the suction pipe
reduced to a minimum (if the machine
is used to suck fluid, see "Machines
installed above the water level")
•
Gates on the delivery and suction line
PIPE ASSEMBLY
Incorrect
•
Be equipped with an appropriate
thermal protection
•
Be equipped with a thermal relay
adjusted according to the actual
current absorbed
Correct
•
Protection from atmospheric agents
•
If the machine is installed above water
level, a stop valve should be fitted on
the suction line
•
If the machine supplies a boiler, a
stop valve should be fitted on the
delivery line
Connection between:
•
Delivery and suction line
•
Delivery and drainage pipe
Controls should be performed by means
of:
•
Thermostatic valve
•
Solenoid valve driven by a pressure
switch or a thermostat
•
Be equipped with a cut-off switch with
protective fuses
•
Be equipped with cables with a section
suitable to the power absorbed by
the motor