IMM AGS-2 7
Restricted Airflow
General
The clearances required for design operation of AGS 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.
The McQuay AGS chillers have several features that can mitigate the problems attributable
to restricted airflow.
• The shape of the condenser section allows inlet air for these coils to come in from both
sides and the bottom. All the coils on one side serve one compressor. Every
compressor always has its own independent 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 (at reduced capacity) as long
as possible, rather than allowing a shut-off on high discharge pressure.
Figure 3, Coil and Fan Arrangement
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 will adjust the unit operation to remain online until
a less severe condition is reached.
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