Unit installation

Installation - Mechanical
SCXF-SVX01K-EN 33
WaterTemperature 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 shut down and
the mechanical cooling function will lockout. However, 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 35°F (2°C).
For more information on constant and variable water flow,
see the Sequence of Operation section of this manual.
Note: Units with waterside economizer can be set from
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.
Hydronic Coil Installation
Steam and Hot Water Coil
Note: Hydronic coil options are available only on 20-80T
units and can be field or factory mounted.
1. Position the coil box behind the unit with open side
facing the unit inlet.
2. An envelope containing the gasket and mounting
screws
to attach the coil to the unit ships in the bottom
of the unit. Install the pressure sensitive gasket to the
unit side of the vertical flange on the coil box in two
places.
3. Before attaching the coil box, connect the coil duct
static
pressure tube.This must be done before the coil
box is bolted to the unit. If the unit connection does not
have a static pressure tube, then no connection is
required.
4. Apply edge protector to the flange on unit. Remove
knoc
kout on the unit filter cover and install the bushing
in the plastic bag. Run the wires through the bushing
and connect wires to the unit.
5. After connecting wires and the static pressure tube,
raise
the coil box up against the unit and install the
mounting screws. Recommended lifting points are at
each end of the coil box.
6. Avoid routing wires over devices and sharp edges. Use
wire
ties about every 12 inches to secure wires to other
wire harnesses.
7. Move the entering air temperature sensor upstream of
the
coil to ensure proper operation.
Refrigerant System
TraneWater Cooled Commercial Self Contained units ship
factory charged with R-410A refrigerant.
Trane Air Cooled Commercial Self Contained and
Condenser units ship with a dry nitrogen holding charge.
Before installing refrigerant piping verify holding charge is
present. Momentarily depress the CSC suction or
discharge line (and Condenser liquid line) access port
valves.
If charge is present continue with piping installation.
If no nitrogen escapes the access valve, leak test the unit
refrigerant system to determine the leak source, and
repair. See Maintenance section, “Refrigerant LeakTest
Procedure,” p. 84. After finding leak, remove test pressure
Figure 25. Condenser water piping components for
cooling tower system
WARNING
Unit Structural Integrity!
Unit panels provide structural integrity. Do not remove
more than two non-adjacent panels at one time as this
could cause the plenum frame to collapse. Failure to
follow these recommendations could result in death,
serious injury or equipment damage.