Armstrong World Industries 302, 242, 122, 203 HWC123,183, 243 Low Ambient Model, Refer to Figure

Service Reference Manual SEQUENCE OF OPERATIONS

2-37

HWC123,183, 243, 303

Low Ambient Model

Refer to Figure 2-7

The low ambient switch is designed to allow the opera- tion of the air conditioning unit below the normal operat- ing range. On units equipped with this switch, sequence of operation during a cooling call is modified when outdoor temperatures fall below the normal operating range.

The switch will interrupt the operation of the outdoor cooling fan when the temperature of the liquid line coming in from the outdoor coil falls below 55° F. When the temperature of the liquid line rises to 95° F, the switch will close and the outdoor fan will resume opera- tion.

The low ambient switch does not affect any other facet of the operation of the unit.

To see simplified and detailed sequences of operation for the HWC123, 183, 243, 303 models, refer to pages 2-5 to 2-9.

SRM-HW/HWC 2/99