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Frequently Asked Questions
What does the outdoor unit actually do?
It carries the compressors and rejects heat.
Its heat exchanger meets outside air.
It varies refrigerant flow to the terminals.
The control intelligence sits here.
The indoor units follow what it provides.
What is diversity and why does it govern selection?
Rooms do not all reach peak at the same time.
Connected indoor capacity exceeds the outdoor unit.
That is intended, not a compromise.
Sizing follows the coincident load, not the total.
Manufacturers publish the permitted ratio.
What happens if the connection ratio is pushed too far?
Performance suffers when everything runs at once.
Those days are few but they are real.
Designing at the top of the range saves capital.
Designing conservatively protects the worst case.
The choice should be deliberate either way.
What limits does the pipework impose?
Total length, furthest run and vertical separation.
All three are bounded by the manufacturer.
Exceeding them costs capacity.
Some arrangements are ruled out entirely.
These belong to the layout drawing.
What separates a heat pump unit from a heat recovery unit?
Whether one circuit can heat and cool at once.
A heat pump unit switches the whole circuit.
A heat recovery unit serves both demands together.
Only the latter moves heat between zones.
The designation is fixed at selection.
How does cold weather affect it?
Capacity falls as the ambient falls.
It is an air-source machine like any other.
Headline ratings are quoted at mild conditions.
Performance should be read at the design temperature.
Cold-climate ranges are built for this.
Can several outdoor units serve one system?
Yes, in modular arrangements.
Modules combine to serve one refrigerant network.
That extends capacity beyond a single unit.
It also allows plant to be delivered in liftable pieces.
The combination is set by the manufacturer.