Armstrong World Industries 302, 243 HWC122,182, 242 Low Ambient Model, Service Reference Manual

Service Reference Manual SEQUENCE OF OPERATIONS

2-39

HWC122,182, 242, 302

Low Ambient Model

Refer to Figure 2-8

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 HWC122, 182, 242, 302 models equipped with the Fenwal Triton 2461D DSI Ignition Control, refer to pages 2-17 to 2-20.

To see simplified and detailed sequences of operation for the HWC122, 182, 242, 302 models equipped with the Fenwal 05-29 Ignition Control, refer to pages 2-27 to 2-30.

SRM-HW/HWC 2/99