Packaged rooftop with gas furnace, 3 m³/s
by HVAC Builder
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A packaged rooftop unit: outside-air damper with an economiser, DX coil on four scroll compressors, a gas duct furnace at 80 % and a supply fan, on a two-fan air-cooled condenser. Its heat is gas — reported as fuel, never as electricity — which is what separates a rooftop's winter from a heat pump's. Published as an example; the figures below are solved from this model.
Example45–65 kW coolingEUExample system. Published by HVAC Builder to show suppliers what their own page looks like. There is no company behind it and it is not a product offer — the specification is generic and the performance is solved from the model on this page.
Design-point performance
Solved from this example's own model as it is published — the same numbers a supplier's page shows for their machine.
Component schedule
| Component | Kind | Duty |
|---|---|---|
| Outside-air damper: 30 % OA, economiser, 07–18 | Damper | 0.0 kW |
| Return damper | Damper | 0.0 kW |
| DX coil | DX evaporator | 58.1 kW |
| Gas furnace, 80 % | Heater | 0.0 kW |
| Supply fan | Fan | -1.4 kW |
| Scroll compressors (4 × ZP49KHE) | Compressor | 12.5 kW |
| Air-cooled condenser | Condenser | -70.0 kW |
| Condenser fans (2) | Fan | -2.4 kW |
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