Unit installation

Installation - Mechanical
32 SCXF-SVX01K-EN
Water Piping
Condenser Connections
Condenser water piping knockouts are in the lower left end
panel. If necessary, remove insulation to gain access. All
field installed piping must conform to applicable local,
state, and federal codes.To complete condenser water
connections follow the procedure below.
Note: Four condenser waterline drain plugs ship in a bag
in the unit’s left end.The installer must field install
these four plugs using pipe thread sealer. An
additional plug is provided for units with a
waterside economizer.
1. Install vent plugs in economizer coil headers and
condenser manifolds. See Figure 24.These plugs ship
in a bag with the condenser drain plugs.
2. Attach the water supply line to the inlet connection,
and the return line to the outlet connection. Entering
and leaving water connections for all condensers are
factory manifolded and require only single
connections for entering and leaving water. If the unit
has a waterside economizer and/or control valves, the
factory pipes between these components.
3. If using a cooling tower, refer to Figure 25, p. 33 for a
typical piping circuit from the unit.
4. Ensure water pressure to unit doesn’t exceed 400 psig.
Note: To prevent water pump damage, design system
piping to provide relief when using energy saving
waterside economizer valves.
Condensate Drain Connections
The condensate drain is internally trapped. Condensate
drain connections are on the unit’s left side.
Connect condensate drain piping to the 1 1/4“ NPT female
fitting, using at least 7/8” OD copper or 3/4“ OD iron pipe.
Pitch the condensate line downward a minimum of 1/2”
for each 10' of horizontal run, away from the unit. Install the
condensate drain “P” trap drain plug. Before starting the
unit, fill the trap with water to prevent negative pressure in
the fan section from impeding condensate flow.To
facilitate drain pipe cleaning, install plugged tees in place
of 90°elbows.
General Waterside Recommendations
Cooling Towers
Cooling tower control affects the unit cycle rates.
Condenser water temperature swings from 10-15°F may
cause excessive compressor, water valve, and unit
cycling. Be sure to set the tower controls to minimize
compressor/unit cycling.
Waterside Piping Arrangements
Install a condenser water pump between cooling tower
(either open or closed) and self-contained unit. Lay out the
remainder of system’s condenser piping in reverse
returns.This helps balance the system by equalizing the
length of supply and return pipes. Multistory buildings
may use a direct return system with balancing valves at
each floor.
Install 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.
Also, include strainers at each pump inlet and unit. Install
drain valves at the riser’s 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. Also,
install a shutoff valve on the unit entering water pipe for
condenser draining.
Note: Unit does not have floor drains.
WARNING
High Pressure Water!
Provide relief valves on system water piping to prevent
instantaneous release of high pressure water. Failure to
provide relief valves could result in death or serious
injury or water pump damage or unit failure.
NOTICE:
Proper Water Treatment Required!
The use of untreated or improperly treated water in
coils could result in scaling, erosion, corrosion, algae or
slime. It is recommended that the services of a
qualified water treatment specialist be engaged to
determine what water treatment, if any, is required.
Trane assumes no responsibility for equipment failures
which result from untreated or improperly treated
water or saline or brackish water.
Figure 24. Economizer coil vent and condenser
cleanout/drain plugs.