Back: Heat Pumps

Defrost & Low-Temperature Operation

Heat Pumps

Heat pump defrosting: why the outdoor unit freezes and when it is normal

Heat Pumps

Heat pump defrost: How the defrost process works

Heat Pumps

Defrost that does not complete correctly: complete checklist

Heat Pumps

Heat pump performance at -5, -10 and -15°C: how to correctly read technical data

Heat Pumps

Heat pump discharge high-temperature protection

Heat Pumps

Compressor discharge temperature at low temperatures: why it rises

Heat Pumps

Frozen defrost drain: why ice accumulates at the base of the outdoor unit

Heat Pumps

Ice on the external fan: causes, symptoms, and risks

Heat Pumps

Strong wind and heat pump: how it affects the external fan and defrost

Heat Pumps

Timed defrost and demand defrost: what is the difference

Heat Pumps

How the defrost cycle is terminated: coil sensor, time, and control logic

Heat Pumps

Low ambient cut-off in a heat pump: what the minimum external operating temperature means

Heat Pumps

Low-temperature checklist: what to check when the heat pump is underperforming

Heat Pumps

Outdoor coil sensor failure: how it affects defrost

Heat Pumps

Refrigerant quantity and defrost: how an incorrect charge affects operation

Heat Pumps

Dirty external exchanger: how it increases icing and defrost cycles

Heat Pumps

Installing an outdoor unit in snow and frost: height, clearances, and protection

Heat Pumps

Compressor crankcase heater: Why it is important at low temperatures

Heat Pumps

External fan during defrost: why it stops in many heat pumps

Heat Pumps

Water vapor from the outdoor unit during defrost: why it looks like smoke

Heat Pumps

Defrost duration: how long it should last and when it is considered excessive

Heat Pumps

Humidity and outdoor unit icing: why it produces more ice on some days

Heat Pumps

Frequent defrosting: when it is normal and when it indicates a problem

Heat Pumps

Backup electric heating element and bivalent point: when does it activate