Trane GEH 006 Manual page 9

Figure 11: Coaxial water coil
Figure 12: Water connection device
Figure 13: 12 1/2-ton + water hook-up
Figure 14: Thermal expansion valve
WSHP-PRC001-EN
Features and
Benefits
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
Table 1: Water connection sizes
Fitting Size
Unit Size
(MBH)
006 thru 015
018 thru 042
048 thru 060
150 thru 180
240 thru 300
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).
(in)
FPT
1/2 FTP
3/4 FTP
1 FPT
1 5/8 FPT
2 1/8 FPT
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