Trane GEV - Manual (Page 13)

Features and
Benefits
WSHP-PRC003-EN
R
13
Schrader Connections:
1/2 to 5-ton
The connections for the low and high
side of the refrigeration system are
located directly beside the control box at
the front, service access panel.
See
Figure 11 for schrader connection lotion.
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 cupro-nickel
(selectable option) coil.The outer refrig-
erant gas tube is made from steel mate-
rial. The coil is leak tested to assure there
is no cross leakage between the water
tube and the refrigerant gas (steel tube)
coil. Co-axial heat exchangers are more
tolerant to freeze rupture.
See Figure 11
for co-axial water coil.
Compressor and Co-axial Coil
Isolation: 1/2 to 5 ton
Vibration isolation of the compressor
and co-axial water coil is accomplished
by increasing the rigidity and stiffness at
the base. The platform provides double
isolation to the compressor and single
isolation to the co-axial water coil for
additional attenuation during compres-
sor start and stop.
Water Connections: 1/2 to 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 connections
are attached to the unit’s chamfer corner
to alleviate the need for a back-up
wrench during installation.
See Figure 12
for water connection device.
Water Connections: 6 to 20-ton
Water hookups for the 6 through 20 ton
units are located internal to the equip-
ment to help alleviate damage to the
water copper during shipment or job
storage of units prior to installation.
Each unit (although dual circuited) con-
tains a single supply and return water
connection.
See Figure 13 for large ton-
nage water hook-up, model GEV. Fittings
for the supply and return are internally
threaded.
Expansion Valve
All Trane water-source systems include
an expansion valve flow metering
device. This thermal expansion valve
(TXV) allows the unit to operate with an
entering fluid temperature from 25 F (3.9
C) to 110 F (43 C), and entering air tem-
peratures from 40 F (4.4 C) to 90 F (32 C).
The valve is designed to meter refriger-
ant flow through the circuitry 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 effi-
ciency of the unit.
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 failure were to
occur. Once the valve is energized for
cooling, it will remain energized until the
control system is turned to the OFF posi-
tion, or a heating cycle is initiated.
Units with the cooling only option will
not receive a reversing valve.
Figure 11: Schrader connections
Figure 12: Water connections - small
ton
Figure 13: Water connections - large
ton
Figure 14: Thermal expansion valve