The engines of yesteryear were pretty simple, with tappets clackity-clacking away on cam lobes, opening valves, and making a ruckus while doing it. Mechanical lifters were adequate for valve operation ...

The new product line covers 124–644 kW in heating and 128–632 kW in cooling, operates down to -15 C, and supports various configurations with R454B or R410a refrigerants.