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www.DaikinApplied.com 19 IOM 1210-7 • MAGNITUDE
®
MODEL WMC CHILLERS
Figure 19: Three-Way Valve, Mid Position
Sizing Vent Piping (ASHRAE Method)
Relief valve pipe sizing is based on the discharge capacity for
the given evaporator or condenser and the length of piping to
be run. Discharge capacity for R-134a vessels is calculated
using a complicated equation that accounts for equivalent
length of pipe, valve capacity, Moody friction factor, pipe ID,
outlet pressure and back pressure. The formula and tables are
contained in ASHRAE Standard 15-2001.
Using the ASHRAE formula and basing calculations on the 225
psi design yields a conservative pipe size. When valves are
piped together, the common piping must follow the rules set out
in the following paragraph on common piping.
Common Piping
According to ASHRAE Standard 15, the pipe size cannot
be less than the relief valve outlet size. The discharge from
more than one relief valve can be run into a common header,
the area of which cannot be less than the sum of the areas
of the connected pipes. For further details, refer to ASHRAE
Standard 15.
Field Insulation
If the optional factory-installation of thermal insulation is not
ordered, insulation should be eld installed to reduce heat
loss and prevent condensation from forming. Insulation should
cover:
• the evaporator barrel, tube sheet, and waterboxes.
• the suction line from the top of the evaporator to the
compressor inlet ange.
• the compressor support brackets welded to the
evaporator.
• the liquid line from the expansion valve to the evaporator
inlet, including the expansion valve.
• the part load balancing valve to the evaporator.
Approximate total square footage of insulation surface required
for individual packaged chillers is tabulated by evaporator
code.
Table 7: Insulation Area Required for WMC Models
WMC Model Evaporator Code
Insulation Area
sq. ft. (m
2
)
043S E2209 78 (7.2)
048S E2209 78 (7.2)
036D E2209 78 (7.2)
036D E2212 104 (9.7)
060S E2609 92 (8.5)
043D E2609 92 (8.5)
048D E2609 92 (8.5)
043D E2612 122 (11.3)
048D E2612 122 (11.3)
060D E3009 106 (10.3)
060D E3012 141 (13.1)
Field Power Wiring
The standard power wiring connection to Magnitude
®
chillers
is single point to a common disconnect switch, which is then
factory-wired to individual disconnect switches for each
compressor. Refer to the unit nameplate and the Daikin Tools
selection report for the correct electrical ratings.
DANGER
Qualied and licensed electricians must perform wiring. An
electrical shock hazard exists that can cause severe injury or
death.
The eld power wiring required varies depending on unit
model. See “Figure 20: Wiring Index” on page 22, “Figure
21: Controller Box Wiring” on page 24, and “Figure 22:
Power Box Single and Multi Point Wiring” on page 26 for
wiring information. These wiring diagrams are also provided
with the chiller. Factory-mounted and wired line reactors are
standard, but not included when the optional combo harmonic
lters are included.
NOTE: Wiring, fuse and wire size must be in accordance with
the National Electric Code (NEC). The supply voltage
to these units must be within minimum and maximum
range per the following table. Also, the voltage
unbalance between phases must not exceed 2%.
WMC Nameplate
Voltage
Minimum Voltage
to Unit
Maximum Voltage
to Unit
380 360 (5%) 440 (15%)
400 360 (10%) 440 (10%)
415 360 (13%) 440 (6%)
440 414 (6%) 506 (15%)
460 414 (10%) 506 (10%)
480 414 (13%) 506 (5%)
575 518 (10%) 632 (10%)
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