Plumbing - Trane CH530 Installation, Operation And Maintenance Manual

Plumbing

When the AFDK is installed in a remote-mount application,
the drive must be cooled by a water-to-water heat
exchanger or a water-to-air heat exchanger. The drive
must be paired with the correct heat exchanger for proper
operation. Table 4 lists the Trane part numbers for the
correct heat exchanger. These assemblies include both
the heat exchanger and cooling pump.
Figure 12. Typical connections for drive cooling
INVERTER
IN
OUT
PRIMARY LOOP
(FILL W/DISTILLED WATER)
(a) Material courtesy of DIMPLEX Thermal Solutions.
To provide proper cooling, the piping used to connect the
heat exchanger to the drive and cooling supply must not
be too long. Because the size and routing of the pipe or
hose used affects the pressure drop and flow of the
system, the maximum distance must be calculated for
each installation. Table 5
pressure for each heat-exchanger assembly, and
contains the pressure information associated with
commonly used parts for constructing the cooling loops.
To calculate the maximum piping distance for the primary
loop, complete the following steps:
1. Select the available pump head
2. Use Table 6 to locate the pressure drop at minimum
flow due to the heat exchanger, drive, and fittings
used. Subtract the sum of these values from the
available pump head and save this result.
3. Use Table 6 to locate the pressure drop at minimum
flow due to each foot of tubing that is planned to be
used in the primary loop. Divide the value obtained in
Step 2 by this number. The result of this calculation is
26
(a)
HEAT EXCHANGER
IN OUT
OUT IN
contains the available head
Table 6
fromTable 5, p.
Table 4. Trane part numbers for heat exchangers
Drive Frame
Frame 3 Drives (405, 600 A)
Frame 4 Drives (900, 1200 A)
Figure 12 shows the typical connections for drive cooling.
The minimum size of pipe or hose used in the primary loop
is 3/4-in. ID.
3/4"
BALL
VALVE
SECONDARY LOOP
(WATER-COOLED ONLY)
3/4"
BALL
STRAINER VALVE
1/4"
BALL
VALVE
the maximum length of tubing that may be used in the
secondary loop.
Note: The maximum length of tube includes both the
supply tube and return tube. The distance
between the drive and heat exchanger should
be half the maximum tube length or less.
4. Verify that the distance needed for installation does
not exceed the maximum distances obtained by this
calculation.
Note: If the calculated distance using 3/4-in. tubing
does not provide an adequate distance for
26.
installation, recalculate the maximum distance
using 1-in. tubing and fittings.
Table 5. Available pump head (ft of water)
Air-Cooled
Water-Cooled
Heat Exchanger
Water-to-Water
020600880100
020600890100
CHILLED WATER
RETURN
EVAPORATOR
CHILLED WATER
SUPPLY
Frame 3
140
100
AFDK-SVU01C-EN
Water-to-Air
020600900100
020600910100
Frame 4
90
70