Overview; R-410A Compressors; Modular Self-Contained Unit; Components - Trane SCWM Series Installation, Operation And Maintenance Manual

Overview

Note: One copy of this document ships inside the control
panel of each unit and is customer property. It must
be retained by the unit's maintenance personnel.
This manual describes proper installation, operation, and
maintenance procedures for water cooled systems. By
carefully reviewing the information within this manual and
following the instructions, the risk of improper operation
and/or component damage will be minimized. It is
important that periodic maintenance be performed to help
assure trouble free operation. A maintenance schedule is
provided at the end of this manual. Should equipment
failure occur, contact a qualified service organization with
qualified, experienced HVAC technicians to properly
diagnose and repair this equipment.
This manual covers installation, operation, and
maintenance of 40-80 tons Commercial Modular Self-
Contained products with R-410A refrigerant.

R-410A Compressors

• Use crankcase heaters which must be energized 24
hours prior to compressor start.
Note: This unit is equipped with stator heating
capabilities that eliminates the need for a
crankcase heater on the variable speed
compressor only. All fixed speeds must utilize a
crankcase heater.
• Contains POE oil which readily absorbs potentially
damaging moisture from air.
• Control box includes a phase monitor to detect phase
loss, line voltage imbalance, and reversal.

Modular Self-Contained Unit

Components

Modular self-contained units are complete HVAC systems
used in floor-by-floor applications.
• A cassette design for easily transporting components
into the building even in the most demanding
environments.
• Left or right hand power connections.
• Left or right hand water connections.
• Factory installed options.
The hermetically sealed scroll compressor motors utilize
internal motor protection and time delays to prevent
excessive cycling.
Units utilize 1-4 refrigerant circuits and ship as cassettes
with a small nitrogen charge and full oil charge. Each circuit
includes filter drier, pressure relief valve, moisture
indicating sight glass, thermostatic expansion valve with
sensing bulb and externally equalized, and high pressure
cutout. The water cooled condensers are brazed plate heat
exchangers and are chemically cleanable with Clean in
PKG-SVX027D-EN
Place as option. Every unit comes with a 20 mesh
cleanable screen that should be installed on the water inlet
of the unit upstream of all condensers, and also come with
differential pressure to indicate when screen should be
cleaned.
Fan Array consists of 1-5 Direct Drive Plenum fans with
each fan equipped with Internal Variable Frequency Drive
and ECM motors.
Figure 1. Modular self-contained signature series unit
components

Standard Controls

Standard controls supplied with the unit include the Trane
UC600 unit controls and the TD-7 touch screen display. All
basic setup parameters are preset from the factory.

TD-7 Touch Screen Display

The TD-7 is unit mounted and accessible without opening
the unit's front panel. It allows easy setpoint adjustment
using the TD-7 touch screen. In addition, the TD-7 displays
all unit operating parameters and conditions in a backlit
color screen.
For more information on TD-7 display, see the Tracer® TD-
7 Display IOM, BAS-SVX50*-EN.
Tracer® UC600 Unit Controller
The UC600 provides "smart" unit control with safety
features and control relays for external devices. The
®
UC600 utilizes BACnet MSTP to communicate to a front
end Building Automation System (BAS). If a BAS System
does not talk BACnet, the Generic Building Automation
System Module can be ordered with the unit to pick up
some information.
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