Maritime Geothermal nordic dx-45, Руководство по установке

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Maritime Geothermal Ltd. 12-Feb-00
by the controller board, allow refrigerant to flow into the
earthloops to which they are attached. Valves which are de-
energized remain closed at port “G” however flow is “OPEN”
between ports “F” and “H” allowing refrigerant to be
“scavenged” from the groundloops not in use. Within a few
minuites all the liquid refrigerant in the idle cooling loops is
rerouted to the one, or more cooling loops that are in use at
the time.
Being able to select the the correct percentage of ground-
loop to engage and scavenging the refrigerant from the idle
loops is important for several reasons:
1.
It allows the to operate in both modes with one charge,
allowing us to disable most of the groundloop system
when it is cold and reintroduce it on a predetermined ba-
sis as the field warms up.
2. It allows the machine to switch from heating to cooling
mode without shut-off on it’s low pressure control since
refrigerant pressure is supplied to the intake of the com-
pressor by the idle loops while the refrigerant is being
repositioned to operate in another loop or loops.
Once the refrigerant enters the groundloop(s) it condenses
giving up its heat and returns to its liquid state. Oil and liquid
refrigerant are swept along the underground copper lines back
to the liquid line header assembly where it flows through the
cooling check valve(s) connected to the respective liquid lines
and onward towards the cooling TX valve which meters re-
frigerant into the air coil as required. Liquid cannot enter any
of the other liquid lines because of the orientation of the cool-
ing checkvalves nor can it enter the heating section of the liq-
uid line header by virtue of liquid line solenoid valve “A” be-
ing energized (closed) while in the cooling mode.