Water System Flow Rates; Water System Pressure Drop - Trane RTXC-XE Series Installation, Operation And Maintenance Manual

Water System Flow Rates

Water System Pressure Drop

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6. If the "CBA" indicator glows instead, open the unit main power disconnect and switch two
line leads on the line power terminal block(s) (or the unit mounted disconnect). Reclose the
main power disconnects and recheck the phasing.
Equipment Damage!
Do not interchange any load leads that are from the unit contactors or the motor terminals.
The terminal connection of the compressor after maintenance must be consistent with Trane
wiring diagrams. Do not interchange any load leads that are from the unit contactors or the
motor terminals to prevent compressor from damage in a reverse rotation. Do not operate
compressor without terminal box cover in place.
7. Reopen the unit disconnect and disconnect the phase indicator.
Establish a balanced chilled water flow through the evaporator within the allowable range in
4. The flow rates should fall between the minimum and maximum values. Chilled water flow rates
below the minimum values will result in laminar flow, which reduces heat transfer and causes
either loss of EXV control or repeated nuisance, low temperature cutouts. Flow rates that are too
high can cause tube erosion.
Measure water pressure drop through the evaporator at the field-installed pressure taps on the
system water piping. Use the same gauge for each measurement. Do not include valves, strainers
fittings in the pressure drop readings.
Pressure drop readings should be approximately those shown in
Pressure Drop Curves and
CAUTION
Table 4.
Figure 10. Evaporator Water
RTXC-SVX003D-EN
Table