Grundfos JP User Manual

7.4 Frost protection
If the product is not used during periods of frost, it
must be drained to avoid damage.
8. Fault finding the product
WARNING
Electric shock
Death or serious personal injury
‐ Switch off the power supply before you
start any work on the product. Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Chemical hazard
Death or serious personal injury
‐ Make sure that the product has only
been used for water. If the product has
been used for pumping aggressive
liquids, flush the system with clean
water before you start work on the
product.
WARNING
Pressurised system
Death or serious personal injury
‐ Before dismantling the product, drain
the system or close the isolating valves
on both sides of the product. Slowly
loosen the drain plug and unpressurise
the system.
8.1 The pump does not start
Cause
Supply failure.
Remedy
Cut in the circuit breaker or replace the fuses. If the
new fuses also blow, check the electrical
installation.
Cause
The pump is blocked by impurities.
Remedy
1. Clean the pump.
2. Clean or replace the strainer in the inlet pipe.
Cause
The motor is defective.
Remedy
Replace the pump.
8.2
The pump stops unexpectedly during
operation and starts again after a while
The thermal switch in the motor has tripped due to
overheating and runs intermittent operation. The
thermal switch will cut in automatically when the
motor has cooled sufficiently. If the problem persists,
check the possible causes:
Cause
The impeller is stuck.
Remedy
Clean the pump.
Cause
The motor is defective.
Remedy
Replace the pump.
Cause
The ambient temperature is too high.
Remedy
Make sure the ambient temperature is below the
maximum ambient temperature stated on the
nameplate.
8.3 The pump runs, but does not deliver the
expected amount of water
Cause
The outlet pipe is blocked.
In this case, the pump typically delivers a reduced
quantity of water at a high pressure.
Remedy
Clean the pipe or open the isolating valves, if any.
Cause
The pump is not filled with water.
Remedy
Prime the pump.
Cause
The inlet pipe is blocked by impurities.
Remedy
Clean the inlet pipe. Clean or replace the strainer
in the inlet pipe.
Cause
The pump is blocked by impurities.
Remedy
Clean the pump. Clean or replace the strainer in
the inlet pipe.
Cause
The suction lift is too high.
19
English (GB)

Grundfos JP Specifications

General

Power supply	Electric
Material	Stainless Steel, Cast Iron
Applications	pressure boosting
Pump Type	Self-priming centrifugal pump
Horsepower	1.5 HP
Phase	Single-phase
Inlet Size	1 inch
Outlet Size	1 inch