Owner`s manual

10
ABOUT YOUR WATERFURNACE SYSTEM
Water
Heater
Warm
Return
Air Duct
Pump
Supply
Air Duct
Cool
Warm Water
to Loop
Cool Water
from Loop
Hot Water
to House
Water
from Unit
Cold Water
to Unit
Pump
Cooling Mode
During cooling, a geothermal system rejects the heat from the indoor air into the earth loop. The cooling cycle starts as
cold, liquid refrigerant passes through the air coil (the evaporator during cooling).
As the refrigerant flows through the air coil, the heat energy transfers from the warm return air to the refrigerant. This
heat transfer causes the cold liquid refrigerant to turn into a gas. The compressor draws the refrigerant gas, compresses
it, and discharges it through the reversing valve. During cooling, the reversing valve is energized, which changes the
openings from one port to another causing the refrigerant flow to go in the opposite direction as in heating mode.
(However, the flow to the compressor does not change direction.)
After compression, the hot refrigerant passes through the coax (the condenser during cooling). In the coax, the hot
refrigerant releases its heat energy to the cool loop fluid through the copper walls. Now cooled and liquified, the
refrigerant passes through the expansion valve back to the air coil. Warm air passing over the cool air coil causes the air
to be cooled and dehumidified.
This process is continuous during the cooling mode.
Cooling Operation