WaterFurnace OM1500MW, Руководство пользователя

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9
ABOUT YOUR WATERFURNACE SYSTEM
Water
Heater
Cold
Return
Air Duct
Pump
Supply
Air Duct
Warm
Cold Water
to Loop
Warm Water
from Loop
Hot Water
to House
Hot Water
from Unit
Cold Water
to Unit
Pump
Heating Operation
Heating Mode
During heating, a geothermal system absorbs the heat from the ground via the earth loop. The heating cycle starts as
cold, liquid refrigerant passes through the water-to-refrigerant heat exchanger (coax, and also the evaporator during
heating). The coax is made of copper (or copper and nickel) and consists of a tube within a tube —water from the loop
travels through one tube (the inside tube), refrigerant passes through the other (outer) tube.
As the loop fluid flows through the coax, the heat energy transfers from the loop fluid to the refrigerant through the
copper wall separating the two. This heat transfer causes the cold liquid refrigerant to turn into a gas. (Unlike water,
refrigerant changes from a liquid into a gas at a very low temperature.) The now gaseous refrigerant flows into the
compressor where it is compressed. After compression, the refrigerant will be very hot (approximately 165° F) and
discharged through the reversing valve and into the air coil.
The air coil is a radiator-like device that has thin aluminum “fins” attached to either copper or aluminum refrigerant
tubing. The refrigerant passes through the air coil (the condenser during heating). As air from the return air duct system
passes over the air coil, heat is released from the refrigerant and absorbed by the cooler air. The result is warm air
(typically 95° to 105° F) which is delivered through the duct system by the blower.
The refrigerant, now cooled again, passes through the expansion valve (which acts as a flow control), returning to the
coax where it can accept more heat from the warmer loop fluid.
This process is continuous during the heating mode.