Grundfos KJI K Series User Manual (English)

Questions and Answers:

K
kathywintersAug 5, 2025
What to do if my Grundfos KJI K does not start or stops immediately after starting?
- M
  Michael BennettAug 5, 2025
  If your Grundfos water pump fails to start or stops shortly after, several factors could be responsible. It could be due to a power failure (contact the electric power company), incorrect voltage, or a significant voltage drop. Inspect the motor and connections for motor phase malfunction. Check the electric circuit for connection faults and correct the wiring if there's a faulty control circuit connection. Replace a blown fuse with the correct type, or replace a faulty magnetic switch with the correct type. If a short circuit is present, locate and repair it. Other potential issues include foreign matter clogging the pump (remove it), a burnt-out motor (rewind it) or damaged motor bearings (replace them).
T
Terry WoodwardAug 15, 2025
Why does my Grundfos KJI K Water Pump start but stop after a short period?
- A
  Anthony MooreAug 15, 2025
  Your Grundfos Water Pump might be stopping shortly after starting because the motor protection has been activated due to prolonged dry operation. To resolve this, adjust (raise) the pump stop water level, ensuring the motor remains partially covered during operation. Alternatively, high liquid temperature may have activated the motor protector; in this case, lower the liquid temperature.
A
angela21Aug 25, 2025
What to do if my Grundfos KJI K Water Pump does not pump adequate volume?
- M
  maryhunterAug 25, 2025
  If your Grundfos Water Pump isn't pumping enough water, several things could be wrong. First, check for reverse rotation and correct it. A significant voltage drop could be the cause, so contact your electric power company. Ensure you're not operating a 60Hz pump on 50Hz by checking the name plate. Also, check if the discharge head is too high or if there's large piping loss, and recalculate and adjust as necessary. Low operating water levels can cause air suction, so raise the water level or lower the pump. Inspect and repair any leaks from the discharge piping. Remove any foreign matter from clogged discharge piping or the suction inlet. If foreign matter is clogging the pump, disassemble and remove it. Lastly, a worn-out impeller can cause this issue, so replace it.

Grundfos KJI K Series Specifications

General

Series	KJI K Series
Category	Water Pump
Installation	Horizontal
Frequency	50 Hz
Material	Stainless steel or cast iron
Application	Water supply, pressure boosting
Motor Power	0.37 kW to 1.5 kW

Summary

OVERVIEW

GENERAL DATA

Provides general data about the pump.

Information of the nameplate

Explains how to identify the pump using its nameplate details.

Pump code designation

Maximum operating conditions

Outlines the limits for temperature, voltage, and submergence.

Safety Precautions

Lists essential safety measures for pump operation and installation.

Applications

Operating conditions

Defines acceptable conditions for pump operation.

Ambient temperature

Level of pumped liquid

Details minimum liquid levels for pump operation and cooling.

CARRIAGE & TRANSPORT

Lifting the pump

Explains the correct method for lifting the pump, emphasizing safety.

STORAGE

Outlines procedures for storing the pump correctly.

Warehouse Storage

Storage in the pit-system not in use

Provides guidance for storing pumps when they are installed but not in use.

INSTALLATION

Covers the process and considerations for installing the pump.

Points for attention during installation

Cable installation and grounding

Instructions for proper underground cable installation and grounding.

Cable Joints

Wet pit ADC installation

Explains the installation method for pumps in a wet pit using ADC.

Wet pit ADC installation instructions

Dry pit installation

Portable installation

Horizontal installation

Explains the process for installing pumps in a horizontal orientation.

Procedure of the Horizontal installation

COMMISSIONING & OPERATION

Initial Examination

Outlines the initial checks and inspections before starting the pump.

Pre-cautions

Check input voltage

Procedure for verifying the input voltage using a Multi-Tester.

Check insulation resistance

How to check insulation resistance using a Mega Tester.

Insulation Check

Insulation check of Power Cable Wiring

Direct On Line (D.O.L)

Procedure for checking insulation resistance for D.O.L. connections.

Star-Delta Starting

Procedure for checking insulation resistance for Star-Delta starting.

Insulation check of Sensor Wiring

How to check insulation resistance for sensor wiring.

Leakage Sensor

Bearing Temperature Sensor

Procedure for testing the bearing temperature sensor resistance.

Control Panel wiring

Wiring diagrams and explanations for control panel connections.

Star - Delta wiring

Thermal Protection Wiring

Explains the wiring for thermal protection systems in the pump.

Changing the Direction of Rotation

Instructions on how to change the motor's direction of rotation.

Star-Delta direction change

Level switch & general wiring

Wiring details for level switches and general operational wiring.

MAINTENANCE, INSPECTION AND OVERHAUL

Maintenance

Outlines daily inspections and periodic servicing for pump longevity.

Current and Voltage monitoring

How to check and interpret current and voltage readings during operation.

Vibration check

How to check if the pump is operating smoothly without excessive vibration.

Discharge Pressure and Flow Rate check

Procedure for checking discharge pressure and flow rate.

Insulation Resistance check

How to check the motor's insulation resistance monthly.

Inspection

Pump Removal

Steps for safely removing the pump from its pit for inspection.

Inspection Procedure

Detailed steps for inspecting the pump's components.

Mechanical Seal check

How to check the mechanical seal sensor's resistance.

Oil Replacement

Procedure for replacing the oil in the pump's oil chamber.

Inspect Impeller and Wear Plate

OVERHAUL

Information regarding the general overhaul procedure for pumps.

TROUBLE SHOOTING

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