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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 crank case 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.
•
Contain 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.
PKG-SVX027A-EN
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.
Note: Refer to the
Figure 1, p. 8
components.
The hermetically sealed scroll compressor motors utilize
internal motor protection and time delays to prevent
excessive cycling.
Units utilize 2-4 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
Place" fittings as option. Every unit comes with a 20 mesh
cleanable screen that will 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 3-5 Direct Drive Plenum fans with
each fan equipped with Internal Variable Frequency Drive
and ECM motors.
for typical unit
7
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