Pump Cycling; Boiler Feed Installations; Frost Protection; Servicing The Product - Grundfos CR 1s Instrucciones De Instalación Y Operación

11.2 Pump cycling

Pump cycling should be checked to ensure the pump is not
starting more often than the following max. starts per hour:
WEG motors:
• 100 times per hour on 1/3 to 1 HP models
• 20 times per hour on 1 1/2 to 20 HP models
• 10 times per hour on 20 to 150 HP models
• 5 times per hour on 200 to 300 HP models.
Grundfos ML motors:
• 200 times per hour on 1/3 to 5 HP models
• 100 times per hour on 7 1/2 to 15 HP models
• 40 times per hour on 20 to 30 HP models.
Rapid cycling is a major cause of premature motor failure due to
overheating of the motor. If necessary, adjust controller to reduce
the frequency of starts and stops.

11.3 Boiler feed installations

If the pump is used as a boiler feed pump, make sure the pump is
capable of supplying sufficient water throughout its entire
evaporation and pressure ranges. Where modulating control
valves are used, a bypass around the pump must be installed to
ensure pump lubrication. See section
pressures.

11.4 Frost protection

If the pump is installed in an area where frost could occur, the
pump and system should be drained during freezing
temperatures to avoid damage. To drain the pump, close the
isolating valves, remove the priming plug and drain plug at the
base of the pump. Do not refit the plugs until the pump is to be
used again. Always replace the drain plug with the original or an
exact replacement. Do not replace with a standard plug. Internal
recirculation will occur, reducing the output pressure and flow.

12. Servicing the product

DANGER
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.
WARNING
Falling objects
Death or serious personal injury
- Follow the lifting instructions.
- Use lifting equipment which is approved for the
weight of the product.
- Persons must keep a safe distance to the product
during lifting operations.
- Wear personal protective equipment.
For lifting instructions, see section
WARNING
Falling objects
Death or serious personal injury
- Keep the product in a stable and fixed position
when working on it..
22
7.3 Minimum inlet
4.3 Lifting instructions.
WARNING
Corrosive liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
WARNING
Contamination when pumping drinking water
Death or serious personal injury
- Before the pump is used for supplying drinking
water, flush the pump thoroughly with clean water.
- Do not use the pump for drinking water if the
internal parts have been in contact with particles or
substances not suitable for water intended for
human consumption.
- Always use original spare parts suitable for
drinking water.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally come into
contact with hot or cold surfaces.

12.1 Contaminated products

CAUTION
Biological hazard
Minor or moderate personal injury
- Flush the product thoroughly with water and rinse
the product parts in water after dismantling.
The product will be classified as contaminated if it has been used
for a liquid which is injurious to health or toxic.
If you request Grundfos to service the product, contact Grundfos
with details about the liquid before returning the product for
service. Otherwise, Grundfos can refuse to accept the product for
service.
Any application for service must include details about the liquid.
Clean the product in the best possible way before you return it.
Costs of returning the product are to be paid by the customer.