Maritime Geothermal EM (DX) 45-55-65, Руководство по установке

Страница: 16 / 32

Page .... 16
Maritime Geothermal Ltd. 17-Feb-00
connected to the common suction inlet line and it’s controller
bulb attached to the vapor inlet line (hot in heating mode) of
the air handler. Liquid refrigerant then travels towards the liq-
uid line header, solenoid valve and check valve assembly. So-
lenoid valve “A” is a normally open valve and is de-energized
during the heating mode thus refrigerant can travel unre-
stricted through the heating check valves (B, C, D, E) towards
the inlet of all the heating TX valves.
Each heating TX valve is equipped with a small bypass
capillary tube which allows approximately 1/2 ton of refriger-
ant to flow regardless of the position of the TX valve. This
by-pass is intended to perform 2 functions:
•
Limits the amount of hunting done by the TX valve due
to the long evaporator length.
•
Prevents the heat pump from tripping out on a high pres-
sure limit if all the heating TX valves decide to close at
the same time.
The TX valves control the flow of liquid refrigerant to it’s
loop by virtue of the sensing bulbs being attached to each
respective return vapor line and all the equalizer lines con-
nected to the common suction inlet line. The sensing bulb of
each TX valve is located just below the connection to the 3-
way valves on the gas line header assembly.
The liquid refrigerant coming in contact with the warm
earth vaporizes to a gas and flows back to the heat pump via
the 13 mm OD copper return vapor lines. System oil is en-
trained in by the velocity of the return gas and is continuously
swept back towards the compressor. Refrigerant vapor nor-
mally picks up from 2 to 6°C superheat as it returns to the
heat pump. Refrigerant vapor enters the 3-way valve header
assembly at ports “F”, passes straight through the valve to
ports “G” where it exits to the vapor line header. From the
vapor line header the refrigerant gas enters the reversing valve
at point “H” and exits to the common suction line “I” where it
travels to the accumulator and onward to the compressor. Hot,
high pressure refrigerant gas enters the desuperheater coil, on
Vertical DX Borehole With Cop-
per “U” Tube
Enough extra tubing has been supplied to
reach into the building when temporary
plastic casing is removed.
Excavate alongside each borehole so that the cop-
per tubing can lay over into the trench.
units so equipped, where a small portion of its heat is re-
moved in the production of hot water. The hot refrigerant then
enters the air coil where the refrigerant vapor is condensed by
the process of cool household air flowing across the air-to-
refrigerant coil. Further sub-cooling of the refrigerant liquid
takes place as the refrigerant reaches the bottom of the coil
and begins another cycle.
1.
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 check valves nor can it enter the heating section of the
liquid line header by virtue of liquid line solenoid valve “A”
being energized (closed) while in the cooling mode.