User Manual

8
Abbreviations
HVAC: Heating, Ventilation, and Air
Conditioning system
HP: Heat Pump System. This type of HVAC
system uses a compressor with a reversing valve
to provide both heating and cooling capability.
HE: Electrically heated central heating system.
This system uses an electric heating element
along with a fan and ducting. Sometimes used as
AUX/Emergency heat with a heat pump system.
Electric baseboard heaters are not included in this
system type.
HG: Fuel-red central heating system. This system
uses a gas or oil burner along with a fan and
ducting, or a hot water baseboard system. Can be
used as a standalone heating system or as AUX/
Emergency heat with a heat pump system.
O/B: This option selects the type of reversing
valve for heat pump systems. An “O” reversing
valve is energized when cooling, and a “B”
reversing valve is energized when heating.