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Frequently Asked Questions
Why is this branch not a set of alternatives?
Because these are the parts of one system.
An installation needs items from several groups.
An outdoor unit alone conditions nothing.
Indoor units cannot run without one.
Most branches offer choices; this one offers components.
What makes VRF different from a central system?
Refrigerant is piped around the building, not air or water.
One outdoor unit serves many indoor units.
Each terminal draws only the flow it needs.
The ductwork a central system needs disappears.
Every room can hold its own setpoint.
What does that design cost in return?
A refrigerant circuit reaching into occupied spaces.
Pipe runs must be designed, not improvised.
The system is pressure-tested before charging.
Leak detection is a requirement, not an accessory.
Remedial work later is far more disruptive.
How is an outdoor unit sized against the indoor units?
On diversity, not on a simple total.
Installed indoor capacity usually exceeds the outdoor unit.
Not every room reaches its peak at the same moment.
The permitted ratio is set by the manufacturer.
Sizing on the raw sum oversizes the plant.
What chooses an indoor unit?
The form the space can physically accept.
Ceiling void depth rules some options out.
Exposed structure rules others in.
Performance differences between forms are modest.
Capacity is matched afterwards, within the diversity limit.
What do branch selectors make possible?
Heating one room while cooling another, simultaneously.
Heat removed from one space is delivered to another.
It happens on the same circuit at the same moment.
Two-pipe systems switch the whole circuit instead.
That capability is decided at design, not later.
Why do controls sit in their own group?
Because a VRF system is a network of addressed devices.
Commissioning assigns and verifies those addresses.
Integration with a building management system lives here.
So does refrigerant leak detection.
None of it belongs to the hardware groups.