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WSHP-PRC001-EN

Figure 11: Coaxial water coil

Figure 12: Water connection device

Figure 13: 12 1/2-ton + water hook-up

Figure 14: Thermal expansion 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 11

for

co-axial water coil).

Compressor and Co-axial Coil

Isolation

For the 1/2-ton through 5-ton units, vi-
bration isolation of the compressor
and co-axial water coil is accom-
plished by increasing the rigidity and
stiffness at the base. This platform in-
cludes double isolation to the com-
pressor and single isolation to the
co-axial water coil. The combination in
the double isolation provide additional
attenuation during compressor start
and stop.

Water Connections

(1/2 thru 5-ton)

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 12

for water connection

device).

Water Connections

(12 1/2 thru 25-ton)

Water hookups for the larger tonnage
units are located internal to the unit to
help alleviate damage to the water
copper during shipment or job storage
of units prior to installation. Each unit
(although dual circuited) contains a
single supply and return water con-
nection. (See

Figure 13

for large ton-

nage water hook-up). Fittings for the
supply and return are internally
threaded.

Table 1

defines water connection siz-

ing for 1/2 ton through 25 ton configu-
rations

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.
Unlike cap-tube assemblies, the ex-
pansion valve device allows the exact
amount of refrigerant required to meet
the coil load demands. This precise
metering by the TXV increases the ef-
ficiency of the unit. (See

Figure 14

for

thermal expansion valve).

Table 1: Water connection sizes

Unit Size

(MBH)

Fitting Size

(in)

FPT

006 thru 015

1/2 FTP

018 thru 042