General Waterside Recommendations; For Cooling Towers; Waterside Piping Arrangements; Water Temperature Requirements - Trane Technologies IntelliPak Signature SCWF Installation, Operation And Maintenance Manual

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 for
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 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 startup 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 startup 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 23. 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 shut down and
the mechanical cooling function will lockout. However, the
economizer (if enabled) will continue to function. The
SCXF-SVX01T-EN
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 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

Steam and Hot Water Coil

WARNING
Unit Structural Integrity!
Failure to follow instructions below could result in
death or serious injury.
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.
Note: Hydronic coil options are available only on 20-80 ton
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
knockout 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,
Installation - Mechanical
35