Case study · Education
Swimming Pool Heating & AHU Heater Battery Fault-Finding
Independent School — City of London
Fault-finding across two separate swimming-pool heating and AHU heater-battery faults, followed by planned replacement and testing of defective high-current switching equipment.
Electrical Fault-FindingHVAC ControlsPlant Room ElectricalHigh-Current Switching
Project context
- Site
- Independent School — City of London
- Sector
- Education
- Location
- Central London
The challenge
Two plant faults. Separate systems. Methodical investigation.
Two separate plant faults required investigation during the initial attendance. The swimming pool was experiencing insufficient water heating, requiring investigation of the heat exchanger and associated heating and control system.
At the same site, a separate fault was present within the AHU electric heater-battery system. The installation incorporated high-current three-phase switching equipment together with multiple contactors, relays and staged control circuits, requiring systematic electrical and controls fault-finding rather than straightforward component replacement.
Investigation & diagnosis
Follow the operating path before replacing equipment.
ElectroLogic carried out electrical and operational checks across the relevant plant and control equipment.
For the AHU heater battery, the existing control panel, power-switching equipment, contactors and associated control circuits were investigated under operating conditions. Current measurements taken during the investigation showed heater loads of approximately 174–177 A.
The investigation identified deterioration and failure of the high-current contactor associated with the heater battery. The condition of the component meant replacement was required.
Remedial works
Planned replacement and operational checks.
A second attendance was arranged specifically to complete the AHU heater-battery remedial work. The defective high-current contactor was removed and replaced.
Existing high-current power connections and associated control wiring were reinstated and checked. Electrical and operational checks were then carried out to confirm correct operation of the repaired switching arrangement.
Engineering capability
Electrical and controls experience across connected plant.
High-current three-phase switching systems
AHU electric heater-battery controls
Contactors and control relays
Staged heating control systems
Operational current and voltage measurements
Existing and legacy control-panel investigation
Diagnosis before component replacement
Outcome
From diagnosis to completed remedial work.
The project demonstrates ElectroLogic's ability to investigate faults across interconnected electrical, HVAC and mechanical plant systems and to progress from initial diagnosis through to planned remedial works.
Rather than simply replacing components, the work involved understanding the existing control arrangement, taking operational measurements, identifying the failed equipment and completing the required repair.