Flocon HVAC Commissioning Modules act as distribution hubs to clusters of terminal units. Each module can accommodate up to 7 terminal units for either heating or cooling circuits. They have been used successfully with groups of fan coil units, air handling units, chilled beams and trench heaters. Commissioning module projects have included office fit-outs, hospital operating theatres and retail premises.
Commissioning modules enable large numbers of connections to be made and tested hydraulically at works. This offers major time and labour savings to site contractors. When used with Alupex flexible piping, installation times are reduced further, as all line joints which lie between terminal points can be dispensed with.
For terminal units installed in ceiling voids, the commissioning of FloCon units is much easier than the traditional method. FloCon modules enable the hydraulic balancing of several units at a time from a single point of ladder access. Balancing is readily achieved by double regulating valves (or commissioning sets), with differential pressure between flow & return held steady by an integral DPCV. Where system fluctuations in flow and return pressures are of no concern, balancing can be effected by pressure-independent regulating valves.
Pre-commissioning flush requirements are greatly assisted by the design of internal pathways. A full-bore bypass between flow and return sections gives the best chance of moving internal debris out of the system. Isolation is provided to enable flushing in contraflow, as well as via normal path. Once commissioned, a large-bodied, fine-mesh strainer at the entry to the flow header keeps the downstream system clean.
Most commissioning modules are supplied mounted within a galvanised steel enclosure, insulated internally to prevent condensation. Insulation of the box means that the module components can be left uncovered, which makes access for maintenance tasks considerably easier.
A recent development has been the introduction of fine-bore bypasses between flow and return manifolds. These remain permanently open, and are designed to pass approximately 10% of full load flow. When demand ceases from the terminal units, bypass flow prevents the build up of ‘dead legs’ in the flow pipework, helping to ensure prompt response when demand from the terminal units is restored. A further advantage is the avoidance of settlement of any impurities that may be in circulation.
During the life of any commissioning module installation, there is a high chance that modifications to terminal unit layout will be required by the client. SAV provide comprehensive support for just this eventuality. Fresh runs of the equipment sizing programmes would be undertaken, with the remit to re-deploy as much of the original complement of equipment as possible. Any additional components would then be identified and instructions drawn up for use by the client’s site team.