A one-pipe main water system offers a few advantages over a two-pipe return system, but it’s only suitable for a few unique cases. Where two-pipe systems utilize two main pipes – a supply to deliver water and a return to bring it back to the pump – a one-pipe main uses one main pipe that stretches around in a loop. Rather than connect each terminal’s supply and return line to the corresponding supply or return main, each terminal’s supply and return is connected to the main.
The one-pipe main system allows for each terminal to be controlled separately by installing the right valves. Unlike a two-pipe system, the terminal can be shut off or flow can be decreased without needing to disrupt the entire circuit. Also, if the installers use a pipe of a consistent size around the system plus a circulator, it won’t require balancing valves or control valves. Even control valve suppliers admit that a one-pipe main system uses up to 40% fewer pipes and valves.
The system is not suitable for all purposes, however. If there are more than a few terminals, the water temperature may not be even throughout the entire system – the terminals furthest from the pump and boiler will be colder. A two-pipe system may be necessary for larger applications requiring even heating.
Pipes run from your condenser to the blower carrying refrigerant, which cools the atmosphere traveling into your home. In single package and split systems, proper ductwork needs to deliver the cool air to every room.
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