6
AGZ 026B through 130B
IOMM AGZ-5
Restricted Air Flow
General
The clearances required for design-life operation of AGZ air-cooled condensers are
described in the previous section. Occasionally, these clearances cannot be maintained
due to site restrictions such as units being too close together or a fence or wall
restricting airflow, or both.
Fortunately, the McQuay AGZ chillers have several features that can mitigate the
problems attributable to restricted airflow.
•
The condenser section is shaped as shown Figure 4. This allows inlet air for these
coils to come in from either side. A vertical coil and its adjacent angled coil are
manifolded together to serve one refrigerant circuit.
•
The MicroTech II
control is proactive in response to “off-design conditions”. In
the case of single or compounded influences restricting airflow to the unit, the
microprocessor will act to keep the compressor(s) running (possibly at reduced
capacity) rather than allowing a shut-off on high discharge pressure.
•
The MicroTech II
control can be programmed to sequence the compressors in the
most advantageous way. For example, in the diagram shown below, it might be
desirable to program circuit #1 to be the lag circuit (last circuit to reach full load)
during periods of high ambient temperatures.
Figure 4, Coil and Fan Arrangement
Buildi
n
g
Circuit #1
Circuit #2
NOTE: Models AGZ 026 to 035 do not have an interior slanted coil.
The following sections discuss the most common situations of condenser air restriction
and give capacity and power adjustment factors for each. Note that in unusually severe
conditions, the MicroTech II
controller would adjust the unit operation to remain
online until a less severe condition is reached.
Summary of Contents for AGZ026BS
Page 103: ...IOMM AGZ 5 AGZ 026B through 130B 103...
Page 104: ...104 AGZ 026B through 130B IOMM AGZ 5...
Page 105: ......
