Iv. System Operation And Service; System Operational Modes - Lennox MS8 SERIES Installation And Service Procedures

Hide thumbs Also See for MS8 SERIES:

Table of Contents

Air conditioner systems have four modes of operation. Heat pumps have five operational modes. These modes are:

Auto

Cooling

Dehumidification

Fan

Heat (HP model only)

AUTO MODE

Auto Mode - Non-adjustable indoor temperature set points are 68F°and 77°F (20°C and 25°C)

NOTE — Reversing valve is de-energized in cooling mode and energized in heating mode.

Delays that normally protect the compressor are disabled during defrost cycles:

1. Minimum three (3) minute compressor time delay between operating cycles.

2. Minimum six (6) minute compressor run time between operating cycles.

If room ambient temperature is equal to or greater than 77°F (25°C), the unit cycles cooling ON. When the room ambient

temperature is equal to or less than 77°F (25°C) minus 3.6°F (2°C), the compressor will cycle OFF, the outdoor fan will cycle

OFF 60 seconds later. The indoor fan will run continuously at a preset speed until system has a heating demand or Auto Mode

is switched OFF.

If room temperature is equal to or less than 64°F (18°C) plus 3.6°F (2 C), the heating will cycle ON when room temperature is

equal to or greater than 64°F (18°C) plus 9.0°F (5°C), the compressor will cycle OFF. The outdoor fan will cycle OFF 60

seconds later. The indoor fan will cycle OFF after 60 seconds on low speed.