8
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 fl ows 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 fl ow to go in the opposite direction that it
was in the heating mode. (However, the fl ow 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 fl uid through the copper walls. Now cooled and liquifi ed, 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 dehumidifi ed.
This process is continuous during the cooling mode.
Cooling Operation
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Hot
Water to
House
Supply
Air
Duct
Cold
Water
to Unit
Water
Heater
Water to Loop
Pump
Hot
Water
from Unit
Water
from
Loop
Earth Loop-
Horizontal, Vertical,
Pond (or Well Water)
Air
Coil
Blower
Return
Air
Duct
Warm
Cool
Cold
Cool
Warm
ABOUT YOUR WATERFURNACE SYSTEM
