Daikin AGZ030E Installation, Operation And Maintenance Manual page 11

Chilled Water Piping
To prevent damage to the evaporator and potential chiller
failure, a supply strainer is required in the inlet water piping
which connects to this evaporator. This strainer must be
installed prior to operation of the chilled liquid pumps.
Field installed water piping to the chiller must include:
• A cleanable strainer installed at the water inlet to the
evaporator to remove debris and impurities before they
reach the evaporator. Install cleanable strainer within
5 feet (1500 mm) of pipe length from the evaporator
inlet connection and downstream of any welded
connections (no welded connections between strainer
and evaporator).
• AGZ-E models 030-180 require a strainer with
perforations no larger than 0.063" (1.6 mm) diameter and
models 190-240 require a strainer with perforations no
larger than 0.125" (3.175 mm) diameter. See the Inlet
Strainer Guidelines on
• A water flow switch must be installed in the horizontal
piping of the supply (evaporator outlet) water line to avoid
evaporator freeze-up under low or no flow conditions. The
flow switch may be ordered as a factory-installed option,
a field-installed kit, or may be supplied and installed in the
field. See page 12 for more
• Piping for units with brazed-plate evaporators must have
a drain and vent connection provided in the bottom of
the lower connection pipe and to the top of the upper
connection pipe respectively, see
evaporators do not have drain or vent connections due
to their construction. Purge air from the water system
before unit start-up to provide adequate flow through the
evaporator.
• Adequate piping support, independent from the unit,
Figure 21: Typical Piping, Brazed-Plate Evaporator
www.DaikinApplied.com
CAUTION
page 10 for more information.
information.
Figure 21. These
Inlet
Outlet
WELDED PIPE CONNECTIONS ARE NOT ALLOWED
BETWEEN THE STRAINER AND EVAPORATOR DUE
TO THE CHANCE OF SLAG ENTERING THE EVAPORATOR
I
to eliminate weight and strain on the fittings and
connections.
It is recommended that the field installed water piping to the
chiller include:
• Thermometers at the inlet and outlet connections of the
evaporator.
• Water pressure gauge connection taps and gauges at
the inlet and outlet connections of the evaporator for
measuring water pressure drop.
• Shutoff valves are necessary to isolate the unit from the
piping during unit servicing.
• Minimum bends and changes in elevation to minimize
pressure drop.
• An expansion tank or regulating valve to maintain
adequate water pressure
• Vibration eliminators in both the supply and return water
lines to reduce transmissions to the building.
• Flush the system water piping thoroughly before making
connections to the unit evaporator.
• Piping insulation, including a vapor barrier, helps prevent
condensation and reduces heat loss.
• Regular water analysis and chemical water treatment
for the evaporator loop is recommended immediately at
equipment start-up.
NOTE: Failure to follow these measures may result in
performance and reliability issues.
Daikin Applied recommends against the use of PVC and
CPVC piping for chilled water systems. In the event the pipe
is exposed to POE oil used in the refrigerant system, the pipe
can be chemically damaged and pipe failure can occur.
Air
Vent
Strainer
Vibration
P
Eliminators
Drain
9 IOM 1206-7 • TRAILBLAZER
a
nsTallaTIon and pplICaTIon
WARNING
Isolation
Valves
Flow
Switch
MODEL AGZ CHILLERS
™
I
nformaTIon