In the simplest terms, Whalen's Innoline^® 50/50 Four Pipe System unit is the combination of two 2-pipe riser fan coil units.  Each half of the unit is sized to meet one half of the heating and cooling load. 

This unique arrangement allows the system to stage on and off to meet the varying demands each day and throughout the year.  The ability provides greater comfort while yielding increased operating savings. 

The Innoline^® 50/50 System allows design day operating costs to be incurred only when necessary.  By using half of the normal main size, with a double Riser Heat Exchanger in each unit, the Innoline^® 50/50 System delivers only the load required for each season, substantially reducing installation and operating costs.

The pumps on an Innoline^® 50/50 System are up to 50% smaller than those found on a conventional 4-pipe system.  Up to 85% of the time a fan coil unit is operating at less than full capacity. The Innoline^® 50/50 System allows you to realize significant operational savings during this time. 



During the winter, when full heating is needed, each half of the system operates in the heating mode, cycling on and off between 0%, 50%, and 100% capacity based on the demand. (see Figure 1)

During summer, when full cooling is needed, each half of the system operates in the cooling mode, cycling on and off between 0%, 50%, and 100% capacity based on the demand. (see Figure 2)

During the spring and fall seasons, when temperatures can fluctuate from day to day, the Innoline^® 50/50 system has all the advantages of a 4-pipe system but with the simplicity and energy efficiency of a riser fan coil unit.  One unit can operate in cooling mode while another can operate in heating mode based on the needs of each space.  No longer are you locked into just heating or just cooling; with the Innoline^® 50/50 system you can heat OR cool without the operating expense of a 4-pipe system. (see Figure 3)

The represents the most striking cost difference between a Whalen Innoline^® 50/50 Four Pipe System design and a conventional 4-pipe system. Rather than 100% of the chilled and hot water flow being circuited by two pumps rated for 100% of their respective flows, the Innoline^® 50/50 Four Pipe System efficiently delivers 4-pipe capacity with just half of the pumping requirement … and the unnecessary full flow requirement during a marginal day during the shoulder seasons is eliminated.

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