Carrier AquaForce 30XA Series Installation Instructions Manual page 121

The combination valve performs the following functions:
• drip-tight shut-off valve
• spring closure design with a non-slam check valve
• flow-throttling valve
When facing the cooler side of unit, the inlet (return) water con-
nection is on the bottom. The outlet (supply) water connection is
on the top. The inlet is connected to the suction guide/ strainer of
the pump via a Victaulic-type connection. The cooler supply has
water-side Victaulic-type connections (follow connection direc-
tions as provided by the coupling manufacturer). Provide proper
support for the piping. If accessory security grilles have been add-
ed, holes must be cut in the grilles for field piping and insulation.
A factory-supplied, insulated 45-degree elbow pipe and a Victau-
lic coupling are shipped with units ordered with a hydronic pump
package. Before starting field piping, use the Victaulic coupling to
connect this elbow pipe to the outlet of the combination valve.
The suction guide/strainer is shipped from the factory with a run-
in screen. This screen is a temporary device used during the start-
up/clean-up process of the chilled water circuit to prevent con-
struction debris from damaging the pump or internal tubes of the
cooler. After all debris has been removed or a maximum of 24
running hours the temporary screen must be removed. See the
Start-Up, Controls, Operation and Troubleshooting guide for fur-
ther information.
CAUTION
The suction guide/strainer is shipped from the factory with a
run-in screen. This temporary screen must be removed after all
debris has been removed or a maximum of 24 running hours.
Failure to remove the temporary screen may result in damage
to the pump or cooler.
NOTE: It is required that a 20 mesh field-supplied strainer be in-
stalled in the inlet piping to the cooler on open loop systems.
A / in. NPT fitting is installed in the inlet piping of the pump for
3
4
connection to an expansion tank. Install the tank in accordance
with the manufacturer's instructions.
Figures 42 and 43 illustrate typical single and dual pump
packages.
Three drain connections are provided and are located at leaving
water (supply) end of cooler, pump volute, and the suction guide.
See Fig. 2-27 for connection location. Insulate the drain piping (in
the same manner as the chilled water piping) for at least 12 in.
(305 mm) from the cooler.
Flooded Cooler Units without Hydronic Pump Package
When facing the cooler side of the unit, the inlet (return) water
connection is on the bottom. It is required that a field-supplied
strainer with a minimum size of 20 mesh be installed within 10 ft
(3.05 m) of the cooler inlet to prevent debris from damaging inter-
nal tubes of the cooler. The outlet (supply) water connection is on
NOTE: Expansion tanks for 30XA hydronic kits must be installed for chillers piped in parallel in the primary water loop.
Fig. 44 — Typical Air Separator and Expansion Tank Location on Primary-Secondary Systems
Distribution Pump
Decoupler Expansion
Tank(s)
the top. The cooler has water-side victaulic-type connections (fol-
low connection directions as provided by the coupling manufac-
turer). Provide proper support for the piping. If accessory security
grilles have been added, holes must be cut in the grilles for field
piping and insulation. See Fig. 45 for a typical piping diagram of a
30XA unit without a hydronic pump package.
A drain connection is located at the leaving water (supply) end of
cooler. See Fig. 2-27 for connection location. Insulate the drain
piping (in the same manner as the chilled water piping) for at least
12 in. (305 mm) from the unit.
Flooded Cooler Dual Chiller Control
The ComfortLink controller allows 2 chillers (piped in parallel or
series) to operate as a single chilled water plant with standard con-
trol functions coordinated through the master chiller controller.
This standard ComfortLink feature requires a communication link
between the 2 chillers on the CCN Bus.
There are several advantages to this type of control:
• redundancy (multiple circuits)
• better low load control, (lower tonnage capability)
• lower rigging lift weights (two machines rather than one
large machine)
• chiller lead-lag operation (evens the wear between the two
machines)
Flooded Cooler Dual Chiller Leaving Water Sensor
If the dual chiller algorithm is used, and the machines are installed
in parallel, a dual chilled water sensor must be installed for each
module. Install the well in the common leaving water header. See
Fig. 46.
Flooded Cooler Parallel Dual Chiller Operation
Parallel chiller operation is the recommended option for dual
chiller control. In this case, each chiller must control its own dedi-
cated pump or isolation valve. Balancing valves are recommended
to ensure proper flow in each chiller. Two field-supplied and in-
stalled dual chiller leaving water temperature sensors are required,
one for each module, for this function to operate properly.
Consider adding additional isolation valves to isolate each chiller
to allow for service on a machine, and still allow for partial capac-
ity from the other chiller. See Fig 46.
Flooded Cooler Series Dual Chiller Operation
Series chiller operation is an alternate control method supported
by the ComfortLink control system. Certain applications might
require that the two chillers be connected in series. For nominal
10º F (5.6º C) cooler ranges, use the minus 1 pass cooler ar-
rangements to reduce the fluid-side pressure drop. Use the stan-
dard cooler pass arrangement for low flow, high cooler tempera-
ture rise applications.
Consider adding additional piping and isolation valves to isolate
each chiller to allow for service on a machine, and still allow for
partial capacity from the other chiller. See Fig. 47.
Air Separator
with Vent
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