Temperature Rise; Electrical Connection - Grundfos CR 1s Instrucciones De Instalación Y Operación

8.12 Temperature rise

It may sometimes be necessary to stop the flow through a pump
during operation.
When the flow is stopped, the power to the pump is transferred to
the pumped liquid as heat, causing a temperature rise in the
liquid.
The result is risk of overheating and consequent damage to the
pump. The risk depends on the temperature of the pumped liquid
and for how long the pump is operating without flow. See the
following temperature rise table.
Time for temperature rise of 18 °F (10 °C)
Pump type
Seconds
CR 1s, 1, 3 210
CR 5 240
CR 10 210
CR 15 150
CR 20 120
CR 32, 45, 64 -
Conditions/reservations
The listed times are subject to the following conditions/
reservations:
• No exchange of heat with the surroundings.
• The pumped liquid is water with a specific heat capacity of
Btu kJ
1.0 / °F (4.18 / °C).
lb. kg
• Pump parts (chambers, impellers and shaft) have the same
heat capacity as water.
• The water in the base and the pump head is not included.
These reservations should give sufficient safety margin against
excessive temperature rise.
The maximum temperature must not exceed the pump maximum
temperature rating.

9. Electrical connection

All electrical work must be performed by a qualified
electrician in accordance with the latest edition of the
National Electrical Code and local codes and
regulations.
Follow the instructions for the motor when carrying
out the electrical connections.
WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
- Connect the pump to an external main switch close
to the pump and to a motor-protective circuit
breaker or a CUE frequency converter. Make sure
you can lock the main switch in OFF position
(isolated). Type and requirements as specified in
EN 60204-1, 5.3.2.
18
Minutes
3.5
4.0
3.5
2.5
2.0
-
Verify the power supply to make sure that the voltage, phases
and frequency match those of the pump. The proper operating
voltage and other electrical information appear on the motor
nameplate. These motors are designed to run on - 10 %/+ 10 %
of the rated nameplate voltage. For dual-voltage motors, the
motor should be internally connected to operate on the voltage
closest to the 10 % rating, i.e., a 208 V motor should be wired
according to the 208 V wiring diagram. The wiring diagram can be
found on either a plate attached to the motor or on a label inside
the terminal box cover.
WARNING
Electric shock
Death or serious personal injury
- The safe operation of this pump requires that it is
grounded in accordance with the National
Electrical Code and local codes and regulations.
- A faulty motor or faulty wiring can cause electric
shock that could be fatal, whether the motor is
touched directly or the current is conducted
through standing water. For this reason, safe
installation and operation require proper grounding
of the pump to the power supply ground (earth)
terminal.
- Connect the ground conductor to the grounding
screw in the terminal box and then to the
ACCEPTABLE grounding point.
- In all installations, connect the above-ground metal
plumbing to the power supply ground terminal as
described in Article 250-80 of the National
Electrical Code.
WARNING
Electric shock
Death or serious personal injury
- Connect the pump to the same protective-earth
(PE) potential as the motor if both motor bearings
are of the insulated type such as ceramic
bearings..
Do not operate the pump if voltage variations are
greater than - 10 %/+ 10 %.