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PKG-SVX029A-EN
To facilitate drain pipe cleaning, install plugged tees in
place of 90° elbows.
General Waterside Recommendations for
Cooling Towers
Cooling tower control affects the unit cycle rates.
Condenser water temperature swings from 10°F to15°F
may cause excessive compressor, water valve, and unit
cycling. Set the tower controls to minimize compressor/unit
cycling.
Waterside Piping Arrangements
Install a condenser water pump between the cooling tower
(either open or closed) and the self-contained unit. Lay out
the remainder of the system condenser piping in reverse
returns. This helps balance the system by equalizing the
length of supply and return pipes. Multi-story buildings may
use a direct return system with balancing valves at each
floor.
Install the supply riser and its return in close proximity.
Furnish both with permanent thermometers to check the
waterside balance during start-up and routine maintenance
checks.
Include strainers at each pump inlet and unit. Install drain
valves at the riser base to allow drainage points for system
flushing during start-up and routine maintenance. For
condenser draining and header removal, include a shutoff/
balancing valve on the entering and leaving waterside
pipes, drain tees, and unions of each unit.
Note: Unit does not have floor drains.
Figure 11. Condenser water piping components for
cooling tower system
Water Temperature Requirements
Do not allow the entering water temperature to go below
54°F (12.2°C) on units with constant water flow (basic
piping).This will cause the compressors to shutdown and
the mechanical cooling function will lockout. The
economizer (if enabled) will continue to function. The
compressors will reset when the entering water
temperature reaches 58°F (15°C).
Units with variable water flow (intermediate piping) have a
modulating condensing pressure control valve that allows
compressor operation down to entering water temperatures
of 37°F (3°C).
Note: Units with a waterside economizer can be set from
the human interface panel for variable or constant
water flow.
Water Piping Verification
• Make return and supply water connections to the unit
and/or waterside economizer piping package with
recommended valves and piping components.
• Install unions to allow waterside maintenance.
• Install cooling tower and standby pumps.
• Treat water to prevent algae, slime, and corrosion.
• Prevent refrigerant piping from rubbing against other
objects.
Installating the Hydronic Coil
Refrigerant System
Trane Water Cooled Commercial Self-Contained units ship
factory charged with R-454B refrigerant.
Installation – Mechanical
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