Daikin Navigator WWV Installation, Operation And Maintenance Manual page 10

not be responsible for any water-borne debris damage or water
side damage to the chiller heat exchangers due to improperly
treated water.
Water systems should be cleaned and flushed prior to chiller
installation. Water testing and treatment should be verified
during initial chiller installation/commissioning and maintained
on a continuous basis by water treatment professionals (see
Limited Product Warranty).
The improper use of detergents, chemicals, and additives
in the chiller system water may adversely affect chiller
performance and potentially lead to repair costs not covered
by warranty. Any decision to use these products is at the
discretion of the owner/occupant/operator/user as such they
assume full liability/responsibility for any damage that may
occur due to their use.
Flow Switch
A flow switch must be included in the chilled water system
to prove that there is adequate water flow to the evaporator
before the unit can start or to shut down the unit if water flow is
interrupted. A solid state, thermal dispersion flow switch that is
factory-wired is standard and is mounted in the chiller leaving
water nozzle.
Temperature sensors and pressure gages are recommended
on the water pipes near the heat exchangers connections.
Furthermore, air vents must also be installed at the highest
points on the pipe.
Should water pump noise be excessive, we recommend using
flexible connectors at both pump or chiller inlet and outlet.
Variable Speed Pumping
Reducing evaporator flow in proportion to load can reduce
system power consumption. Daikin Applied chillers are
designed for variable water flow duty provided that the rate of
change is less than 10 percent of the design flow per minute,
and the minimum and maximum flow rates for the evaporator
are not exceeded. If flow drops below the minimum allowable,
large reductions in heat transfer can occur. If the flow exceeds
the maximum rate, excessive pressure drop and tube erosion
can occur. For example, if the maximum design flow is 200
gpm and it will be reduced to a flow of 140 gpm, the change
in flow is 60 gpm. Ten percent of 200 gpm equals 20 gpm
change per minute, or a minimum of three minutes to go from
maximum to desired flow.
Glycol Solutions
Test coolant with a clean, accurate glycol solution hydrometer
or refractometer to determine the freezing point. On glycol
applications, the supplier normally recommends that a
minimum of 25% solution by weight be used for protection
against corrosion or that additional inhibitors should be
employed.
IOM 1264-1 • NAVIGATOR
®
CAUTION
MODEL WWV CHILLERS
I
nsTallaTIon and
The following table gives glycol concentrations required for
freeze and burst protection.
Table 2: Protection Temperatures for Glycols
Percent Volume Glycol Concentration Required
For Freeze Protection
°F (°C)
Ethylene
Glycol
20 (6.7) 16
10 (-12.2) 25
0 (-17.8) 33
-10 (-23.3) 39
-20 (-28.9) 44
-30 (-34.4) 48
-40 (-40.0) 52
-50 (-45.6) 56
-60 (-51.1) 60
NOTE: These values are examples only and cannot be
appropriate to every situation. Generally, for an
extended margin of protection, select a temperature
at least 10°F lower than the expected lowest ambient
temperature/operating LWT. Inhibitor levels should be
adjusted for solutions less than 25% glycol.
Do not use automotive grade antifreeze. Industrial grade
glycols must be used. Automotive antifreeze contains
inhibitors that will cause plating on the copper tubes within the
chiller evaporator. The type and handling of glycol used must
be consistent with local codes.
Glycol Factors
WWV chillers are designed to operate with leaving anti-freeze
solution temperatures per software range limits. Consult the
local Daikin Applied sales office for performance outside
these temperatures. Leaving chilled fluid temperatures below
40°F (4.4°C) result in evaporating temperatures at or below
the freezing point of water and a glycol solution is required.
MicroTech III control inhibits compressor unloading at leaving
®
fluid temperatures below 25°F (-3.9°C).
Low fluid temperatures or high equipment room humidity may
require optional double evaporator insulation. The system
designer should determine its necessity. The use of glycol may
impact system performance depending on its concentration
and should be considered during initial system design.
10
a C
pplICaTIon onsIderaTIons
For Burst Protection
Propylene Ethylene Propylene
Glycol Glycol Glycol
18 11
29 17
36 22
42 26
46 30
50 30
54 30
57 30
60 30
CAUTION
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