DX split, 12 kW class
by HVAC Builder
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A direct-expansion split — indoor fan and coil, scroll compressor, and an outdoor coil behind a two-fan bank that stages down to hold head pressure in cool weather. Published as an example of what a supplier's system page looks like; its performance below is solved live from this model.
Example12–16 kW heating + 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: 10 % OA, economiser, 07–21 | Damper | 0.0 kW |
| Return damper | Damper | 0.0 kW |
| Indoor fan | Fan | -0.2 kW |
| Indoor coil | DX evaporator | 12.5 kW |
| Scroll compressor | Compressor | 3.3 kW |
| Condenser fans (2) | Fan | -0.5 kW |
| Outdoor coil | Condenser | -15.7 kW |
Accessory schedule
| Tag | Item | Data | Qty | Location |
|---|---|---|---|---|
| Refrigerant circuit | ||||
| TXV-1 | Expansion valves Thermostatic expansion valve, external equalizer | 1 | Indoor coil, refIn | |
| FD-1 | Filter-driers and suction filters Liquid-line filter-drier | 1 | Outdoor coil, refOut | |
| SG-1 | Sight glasses and moisture indicators Sight glass with moisture indicator | 1 | Outdoor coil, refOut | |
| Air cleaning | ||||
| A4 | Panel and pleated filters Pleated return-air filter | Filter class: ISO ePM2.5 | 2 | Indoor fan, airIn |
| Controls, sensors and metering | ||||
| A5 | Room controllers and thermostats Room thermostat | 1 | — | |
| Vibration, seismic and noise | ||||
| A6 | Elastomeric mounts and pads Compressor rubber mounts | 4 | Scroll compressor | |
Heat-pump rating
No refrigerant circuit in this machine is declared cooling-only, and none condenses in an evaporative condenser, so it is also rated as a heat pump. Solved with the circuit running backwards at the standard air-to-air heating rating point — outdoor 7 °C dry bulb / 6 °C wet bulb, indoor 20 / 15 °C (EN 14511) — not at the supplier's own design conditions above, so the two ratings can be compared across machines.
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