113
GENERAL
See Fig. 37A-38B for typical piping and wiring. The Victaulic
connections allow clamp-on connection of water lines to the
coolers in all 30XA units. See Table 3 for 30XA unit operating
range. See Fig. 39 for cooler option dimensions. A flow sensor is
factory-installed in the side of the entering fluid nozzle for flooded
units and is located in the leaving fluid nozzle for DX cooler units.
See Fig. 40.
Minimum Loop Volume
The preferred minimum loop volume is dependent on the type of
application. In order to obtain leaving water temperature stability
for comfort cooling applications, a minimum of 3 gallons per ton
(3.25 liters per kW) is required on all unit sizes. For process cool-
ing applications, applications where high stability is critical, or op-
eration at ambient temperatures below 32 F (0° C) is expected, the
loop volume should be increased to 6 to 10 gallons per ton (6.46 to
10.76 liters per kW) of cooling. In order to achieve this volume, it
may be necessary to add a water storage tank to the water loop. If
a storage tank is added to the system, it should be properly vented
so that the tank can be completely filled and all air eliminated.
Failure to do so could cause lack of pump stability and poor sys-
tem operation. Any storage tank that is placed in the water loop
should have internal baffles to allow thorough mixing of the fluid.
See Fig. 41.
System Piping
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. Factory-
supplied hydronic systems are available with single or dual (for
back-up) pumps. The factory-installed system includes all of the
components above the line in Fig. 42 and 43.
Installation of water systems should follow sound engineering
practice as well as applicable local and industry standards. Im-
properly designed or installed systems may cause unsatisfactory
operation and/or system failure. Consult a water treatment special-
ist or appropriate literature for information regarding filtration,
water treatment, and control devices. Figures 42 and 43 show a
typical installation with components that might be installed with
the hydronic package of the 30XA unit.
ISOLATION VALVE*
STRAINER*
VIBRATION
ELIMINATORS*
BALANCING VALVE/
SHUT OFF*
POWER
FD
FD
CONTROL
PRESSURE/
TEMPERATURE TAPS*
PUMP
DRAIN
SHUTOFF
VALVE
NOTES:
1. Chiller must be installed level to maintain proper compressor oil return.
2. Piping shown are general points-of-connection guides only and are not
intended for a specific installation. Wiring and piping shown are for a quick
overview of system and are not in accordance with recognized standards.
3. All wiring must comply with applicable local and national codes.
4. All piping must follow standard
piping techniques. Refer to Carrier System
Design Manual or appropriate ASHRAE (American Society of Heating,
Refrigerating, and Air-Conditioning Engineers) handbook for details.
5. A 20 mesh strainer is required within 10 ft (3 m) of the cooler.
LEGEND
*Field-installed.
FD —
Fused Disconnect
Airflow Through Condenser
Chilled Water Piping
Power Wiring
Fig. 37A — 30XA Flooded Cooler Typical Piping and Wiring (Units without Hydronic Package)
a30-4114
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