Central Hot Water Failure
Residential unit block 15 units has a central hot water unit, the existing gas infrastructure was old and inadequate resulting in insufficient gas pressure to the central hot water water causing it to go into "fault mode" ultimately leading to no hot water for residents. It also leads to service calls by hour company to reset and reignite the system as the "raypak hot water heater" thinks there are unsafe conditions thus does not automatically reignite.
we identified the cause to be low supply pressure and be undersized gas pipe work from the authorities gas mains to the Raypak heater, during high demand periods (generally evenings) when cooking, heating and showering is undertaken the gas pressure within the private pipwork drops due to demand exceeding supply which then causes the low gas pressure sensor to activate and shutdown the hot water unit.
we replaced te pipe work from the authorities connection point- (path valve) to the building multiple gas meters and to the hot water system with a larger diameter pipe 65mm. This has resolved the issues
