Specifications

Cat 604-5 35
Application Considerations
Include thermometers and pressure gauges at the chiller inlet
and outlet connections and install air vents at the high points of
piping. Where noise and vibration are critical and the unit is
mounted on spring isolators, flexible piping and conduit
connections are necessary.
Variable Fluid Flow Rates and Tube Velocities
Many chiller system control and energy optimization strategies
require significant changes in evaporator water flow rates. The
Magnitude chiller line is particularly well suited to take full
advantage of these energy saving opportunities provided that
the maximum and minimum fluid flow rates are taken into
consideration for a specific application. The sales engineer has
the flexibility to use different combinations of shell size,
number of tubes, and pass arrangements to select the optimum
chiller for each specific application.
Both excessively high and excessively low fluid flow rates
should be avoided. Excessively high fluid flow rates and
correspondingly high tube velocities will result in high fluid
pressure drops, high pumping power, and potentially tube
corrosion and/or tube corrosion damage. Excessively low fluid
flow rates and correspondingly low velocities should also be
avoided as they will result in poor heat transfer, high
compressor power, sedimentation and tube fouling.
Excessively high or low tube velocities can be particularly
problematic and damaging in open loop systems.
Rates of Fluid Flow Change
If it is decided to vary the evaporator water flow rate the rate
o
f change should not exceed 50% per minute and should not
exceed the minimum or maximum velocity limits as
determined by the Daikin chiller software program.
Vibration Mounting
Daikin Magnitude chillers are almost vibration-free.
Consequently,
floor mounted spring isolators are not usually
required. Rubber mounting pads are shipped with each unit. It
is wise to continue to use piping flexible connectors to reduce
sound transmitted into the pipe and to allow for expansion and
contraction.
System Water Volume
All chilled water systems need adequate time to recognize a
load change, respond to that load change and stabilize, without
undesirable short cycling of the compressors or loss of control.
In air conditioning systems, the potential for short cycling
usually exists when the building load falls below the minimum
chiller plant capacity or on close-coupled systems with very
small water volumes.
Some of the things the designer should consider when looking
at water volume are the minimum cooling load, the minimum
chiller plant capacity during the low load period and the
desired cycle time for the compressors.
Assuming that there are no sudden load changes and that the
chiller plant has reasonable turndown, a rule of thumb of
“gallons of water volume equal to two to three times the
chilled water gpm flow rate” is often used.
A properly designed storage tank should be added if the
system components do not provide sufficient water volume.
System Analysis
Although we recommend analyzing the entire system, it is
generally effective to place the chiller in the most efficient
mode because it is a large energy consumer.
The Daikin Energy Analyzer program is an excellent tool to
investigate the
entire system efficiency, qu
ickly and
accurately. It
is especially good at comparing different system
types and operating parameters. Contact your local Daikin
sales office for assistance on your particular application.
Retrofit Knockdown
It is estimated that fifty percent of retrofit applications require
partial or complete disassembly of the chiller. Magnitude
chillers are relatively easy to disassemble due to the small
compressor size, simplified refrigerant piping and the absence
of a lubrication system with its attendant components and
piping. Three knockdown arrangements are available as
options. For detailed knockdown dimensions and installation,
see IM Knockdown, available at www.DaikinApplied.com.
Contact your local Daikin Factory Service for price quotation
and installation scheduling.
TYPE I provides a moderate amount of disassembly. The
compressor, suction and discharge piping, and compressor
VFD power panel are removed and put on a skid. The
touchscreen and mounting arm will ship in a separate
container. All associated wiring and piping will remain
attached if possible. The remaining loose parts will be
packaged in a separate crate.
TYPE II provides a total knockdown of the unit. The
compressor and VFD power panel are removed and put on a
skid. The touchscreen and mounting arm will ship in a separate
container. The condenser, evaporator, and tube sheet supports
will remain connected only by the attachment bolts for easy
disassembly at the job site. All wiring and piping that
interconnects the components will be removed. The remaining
loose parts will be packaged in a separate crate.
Type III units are shipped fully assembled, factory charged,
run-t
ested, insulated and painted; ready for disassembly at the
job site. Included are the vessel bolt-on connection brackets,
discharge line bolt-on flanges at the condenser. Touch-up paint
and stick-on wire ties will be included. Site disassembly and
reassembly must be supervised by Daikin startup personnel.