Daikin Pathfinder AWV Installation, Operation And Maintenance Manual page 22

Waterside Economizer Operating
Guidelines
1 . Fluid used in IWSE systems must contain glycol.
The system glycol percentage must be high enough to
avoid burst conditions at the lowest possible ambient
temperature of the installed location, regardless of
whether the unit is operating or turned off at that
minimum temperature. The chiller fluid loop is required
to be protected against burst conditions at least 5°F
below minimum operating and non-operating ambient
temperatures. It is recommended to protect the system
against freeze conditions 5°F below minimum operating
and non-operating ambient temperatures. Failure to
ensure adequate glycol freeze protection may result in
damage of the water-side economizer coils and coolant
leakage from the system.
2. If the chiller is hydraulically isolated, some method of
pressure relief must be added to the chiller side fluid
loop such as a relief valve or expansion tank; see
43 for connection port. Daikin supplied relief valve kit
provides relief valve with ½" female NPT connection and
allows for customer to pipe to blowdown tank or other
receptacle as may be required by local building codes.
The system must not have quick-acting valves or other
sources of surge pressure in the fluid loop.
3. Maximum flow rates must be observed to protect IWSE
coils and piping; see Pressure Drop Data on page 42.
4. A strainer for the glycol system must meet the
requirements of Inlet Strainer Guidelines on page 18.
5. Inhibitors for steel, copper, brass, and aluminum must
be included for all closed water loop systems. Some
glycols include inhibitors and should be considered when
commissioning the water system. Also, all chemicals and
additives must be compatible with polypropylene pipe.
6. The glycol system should include a biocide to protect the
system against biological growth. The biocide should be
non-ionic, non-foaming, and non-oxidizing.
7. Water system maximum allowable chlorides content is
25 ppm to prevent corrosion of aluminum IWSE coils.
Figure 43: Connection Ports on IWSE Piping
IOM 1242-8 • PATHFINDER MODEL AWV CHILLERS
®
Installation and Application Considerations
Figure 44: Integrated Waterside Economizer Operation
Figure 45: Mechanical Cooling Operation Only
Figure
Electrical Connections
Pathfinder units can be ordered with either standard multi-
®
point power or optional single point power connections and
with various disconnect and circuit breaker options. Power
wiring connections to the chiller may be done with either
copper or aluminum selected conductors, provided they fit
the chiller lugs. All wiring must be done in accordance with
applicable local and national codes, including NECA/AA
10402012, Standard for Installing Aluminum Building Wire and
Cable (ANSI). Wiring within the unit is sized in accordance with
the NEC . Refer to the unit nameplate and the unit selection
®
report for the correct electrical ratings.
Qualified and licensed electricians must perform wiring.
Disconnect, lockout, and tag all electrical power sources to
the unit before servicing the compressor and/or removing
refrigerant. An electrical shock hazard exists that can cause
severe injury or death.
22
DANGER
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