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WSHP-PRC001-EN 7
Figure 9: Coaxial water coil
Figure 10: Water connection device
Figure 11: Thermal expansion valve
Figure 12: Reversing valve
Co-axial Water-to-Refrigerant Coil
The unit’s internal heat exchanging
water coil is engineered for maximum
heat transfer.
The copper or cupro-nickel seamless
tubing is a tube within a tube design.
The inner-water tube contains a deep
fluted curve to enhance heat transfer
and minimize fouling and scaling. It is
available in either copper or cu-
pro-nickel (selectable option) coil.The
outer refrigerant gas tube is made
from steel material. The coil is leak
tested to assure there is no cross leak-
age between the water tube and the
refrigerant gas (steel tube) coil. Co-ax-
ial heat exchangers are more tolerant
to freeze rupture. See Figure 9 for
co-axial water coil.
Compressor and Co-axial Coil
Isolation
Vibration isolation of the compressor
and co-axial water coil is accom-
plished by increasing the rigidity and
stiffness at the base. The platform pro-
vides double isolation to the compres-
sor and single isolation to the co-axial
water coil for additional attenuation
during compressor start and stop.
Water Connections
The water-in/water-out connections to
the co-axial water coil are located on
the right-hand chamfered corner of
the unit. The fittings are mounted flush
to the chamfered wall to help limit
shipping damage.
The water connection devices are con-
structed of copper or bronze material
and include a National Female Pipe
Thread (NFPT) junction. The connec-
tions are attached to the unit’s cham-
fer corner to alleviate the need for a
back-up wrench during installation.
See Figure 10 for water connection de-
vice.
Expansion Valve
All Trane water-source systems in-
clude an expansion valve flow meter-
ing device.
This thermal expansion valve (TXV) al-
lows the unit to operate with an enter-
ing fluid temperature from 25 F to 110
F, and entering air temperatures from
40 F to 90 F. The valve is designed to
meter refrigerant flow through the cir-
cuitry to achieve desired heating or
cooling.
The expansion valve device allows the
exact amount of refrigerant required
to meet the coil load demands. This
precise metering by the TXV increases
the efficiency of the unit. See Figure 11
for thermal expansion valve.
Reversing Valve
A system reversing valve (4-way
valve) is included with all heating/
cooling units. This valve is piped to be
energized in the cooling mode to allow
the system to provide heat if valve fail-
ure were to occur. Once the valve is
energized for cooling, it will remain
energized until the control system is
turned to the OFF position, or a heat-
ing cycle is initiated.
Units with the cooling only option will
not receive a reversing valve. See Fig-
ure 12 for reversing valve.
Features and
Benefits