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Frequently Asked Questions
What is contained in the cabinet?
A complete cooling system and a heating section.
Compressor, condenser, evaporator and supply fan.
Heating is usually gas-fired or electric.
Filters and controls are included.
The space below houses no plant at all.
How is this different from a rooftop heat pump?
Heating and cooling come from different sources.
The refrigerant circuit only ever cools.
Heat comes from combustion or from elements.
Outdoor temperature does not affect heating output.
No supplementary heat is needed at the extreme.
Why is one unit per zone the usual arrangement?
It matches the way buildings are occupied.
A tenancy or an area gets its own machine.
It has its own thermostat and service history.
A failure affects that area only.
Capacity is added by adding units.
Why does that suit multi-tenanted property?
Usage separates naturally by unit.
Each tenancy's consumption can be identified.
Fit-out changes affect one machine.
Service can be arranged tenancy by tenancy.
Retail and office suites use this widely.
What does an economiser do?
It uses cool outside air instead of compressors.
Dampers admit more outside air when it is cooler.
Mechanical cooling reduces or stops.
In temperate climates that covers many hours.
The saving is genuine and continuous.
What stops an economiser working?
Commissioning that was never completed properly.
Dampers, actuators and sensors must all function.
A stuck damper silently disables the saving.
Nothing alerts anyone when it fails.
Periodic checking is the only remedy.
What maintenance does the unit need?
Filter changes on a regular schedule.
Coil cleaning on both sides.
Belt and bearing checks where fitted.
Condensate drain clearing before each season.
All of it happens on the roof.