Step 3 - Connect Chilled Water Loop; Air Separation - Carrier 09FC020 Installation, Start-Up And Maintenance Instructions

Fig. 14 — Perimeter Support Channel
Fig. 15 — Isolator
Step 3 — Connect Chilled Water Loop
Proper system design and installation procedures should be fol-
lowed closely. The system must be constructed with pressure tight
components and thoroughly tested for installation leaks.
Installation of water systems should follow sound engineering
practice as well as applicable local and industry standards.
Improperly designed or installed systems may cause unsatisfacto-
ry operation and/or system failure. Consult a water treatment spe-
cialist or appropriate literature for information regarding filtration,
water treatment, and control devices. Figure 16 show a typical in-
stallation and components.
To facilitate servicing, it is recommended additional field-supplied
air vents be installed. Locate air vents at the highest possible point
of the chilled water systems. To assist with filling and draining the
coils, a vent and drain are located on the top and bottom of each
coil header. Connections are
field-supplied air vents, facilitate servicing in addition to flow bal-
ancing by installing field-supplied shut-off valves, thermometers,
clean-out tees, pressure and temperature taps in the inlet and outlet
piping. Locate valves in return and supply chilled water as close to
the 09FC as possible.

AIR SEPARATION

For proper system operation, it is essential that water loops be in-
stalled with proper means to manage air in the system. Free air in
the system can cause noise, reduce capacity, stop flow, or even
cause pump failure due to pump cavitation. For closed systems,
equipment should be provided to eliminate all air from the system.
The amount of air that water can hold in solution depends on the
pressure and temperature of the water/air mixture. Air is less solu-
ble at higher temperatures and at lower pressures. Therefore, sepa-
ration can best be done at the point of highest water temperature
and lowest pressure. Typically, this point would be on the suction
side of the pump as the water is returning from the system or ter-
minals. This is generally the optimal place to install an air separa-
tor, if possible.
1. Install automatic air vents at all high points in the system. (If
the 09FC unit is located at the high point of the system, a vent
can be installed on the supply piping.)
2. Install an air separator in the water loop, at the place where
the water is at higher temperatures and lower pressures —
usually in the chilled water return piping. On a primary-sec-
ondary system, the highest temperature water is normally in
the secondary loop, close to the de-coupler. Preference should
be given to that point on the system (see Fig. 16). In-line or
centrifugal air separators are readily available in the field.
If it is not possible to install air separators at the place of the high-
est temperature and lowest pressure, preference should be given to
the points of highest temperature. It is important that the pipe be
sized correctly so that free air can be moved to the point of separa-
tion. Generally, a water velocity of at least 2 feet per second (0.6 m
per second) will keep free air entrained and prevent it from form-
ing air pockets.
Automatic vents should be installed at all physically elevated
points in the system so that air can be eliminated during system
operation. Provisions should also be made for manual venting
during the water loop fill.
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/ in. SAE male flare. In addition to
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