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4. ELECTRICAL INSTALLATION / EARTHING
4.1. Regulations: The electrical installation must be carried out in accordance with
the current national electrical regulations and installed by a qualified person.
4.2.
RCD's/ELCB's are not recommended for use with variable speed drives/motors.
If an RCD is mandatory use type B RCD's.
4.3. For single phase sets with invertor motors the earth leakage circuit breaker must
trip out when an earth fault currents with DC content (pulsating DC) occur.
4.4. RCD's suitable for use with variable speed drives/motors are not suitable for
personnel protection.
4.5. Do not touch any electrical components for at least 5 minutes after the unit has
stopped to allow any discharge to occur safely.
4.6. Before starting work on the electrical supply ensure power supply is isolated.
4.7. DO NOT allow the supply cord to contact hot surfaces, including the motor
shell, pump body or pipework. The cord should be safely routed and secured by
cable clips.
4.8. Adjacent pipes: Adjacent suction and delivery pipes should be fitted with
earthing clamps in accordance with current regulations (ref Fig 4).
Fig 4.
Diagram of earth continuity connections
4.9. Earthing: This appliance must be earthed via the supply cord.
4.10. Pipework: Copper or metallic pipework must have supplementary earth
bonding where the continuity has been broken by flexible hoses or plastic
components (not supplied).
4.11. Additional earthing: Certain installations may require additional earthing
arrangements such as equipotential bonding. Reference should be made to the
relevant regulations concerning this subject to ensure compliance.
4.12. Connections: The pump must be permanently connected to the fixed wiring of
the mains supply using the factory fitted supply cord, via a double pole
switched fused spur off the ring main and NOT connected to the boiler or the
immersion heater circuits.
- 12 -
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Questions and answers
The pump is making a loud humming noise probably best described as vibration noise. The water pressure in the house is still normal. I tried resetting the pump but the noise came straight back instantly.
A loud humming or vibration noise in a Stuart Turner MAINSBOOST VariQ pump could be caused by the pump being mounted in a way that amplifies noise through loose panels or pipework. Care must be taken during installation to ensure secure mounting to avoid such noise issues.
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is it normal that variq pump in my home goes off frequently if no taps are on please
No, it is not normal. If the Stuart Turner MAINSBOOST VariQ pump turns off frequently when no taps are on, it may indicate a leak in the system, debris under the non-return valve sealing face, or improper pipework installation. Running the pump at full flow to flush debris or checking and replacing the non-return valve may help resolve the issue.
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Pump keeps making knocking noise approx every 30 sec when not in use.