Panasonic R410A service manual Processes and functions, 2-1Room Temperature Control, A Cooling

2. Processes and functions

2-1 Room Temperature Control

The unit adjusts room temperature by turning the outdoor unit’s compressor ON and OFF. This process is controlled by the thermostat located in the remote control unit.

The figures on this and the next pages show how each part of the system performs when the room temperature changes and the thermostat activates the compressor to start (thermo ON) or stop (thermo OFF). Fig. 1 shows about the cooling cycle, and Fig. 2 shows about the heating cycle.

(A) Cooling

BODY SENSOR

T+2 °F

SET TEMP. T °F

T–2 °F

COMPRESSOR

21

OUTDOOR FAN (H OR M)

	(THERMO. OFF)
THERMO. OFF	ROOM TEMP.
(THERMO. ON)	THERMO. ON

MORE THAN	3 MINUTES	5 MINUTES	MORE THAN	MORE THAN
5 MINUTES			3 MINUTES	5 MINUTES
ON	OFF	ON	OFF	ON
ON	OFF	ON	OFF	ON

INDOOR FAN

SET SPEED

1. Refer to 2-4 Outdoor Fan Speed Control

1133_THS_I

Fig. 1

Chart Summary and Explanations

Once the compressor starts, it keeps running for 5 minutes.

Once the compressor stops, it will not start running again for 3 minutes.

If you change the operation mode (HEAT, COOL or FAN) during the heating cycle, the control circuit stops the compressor for 3 minutes.

For 5 minutes after the compressor is first turned on, and for 3 minutes after it is turned off, the compressor is not controlled by the room sensor.

Thermo ON: When room temperature rises 2 F (4˚F when set on body sensor) above the set temperature T˚, (T˚+2˚F or T˚+4˚F when set on body sensor):

Compressor ON

Thermo OFF: When the room temperature is –2˚F below the set temperature T˚:

Compressor OFF

2-2