Room Temperature Control; Cooling; Chart Summary And Explanations; Section 2: Processes And Functions - Sanyo C4272R Service Manual

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
SET TEMP
1
COMPRESSOR
1
OUTDOOR FAN
2
(H OR M)
INDOOR FAN
3
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.
4
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
Thermo OFF: When the room temperature is –2˚F below the set temperature T˚:
5
6
THERMO. OFF
T+2 °F
. T °F
T–2 °F
MORE THAN
3 MINUTES
5 MINUTES
ON OFF
ON OFF
1. Refer to 2-4 Outdoor Fan Speed Control

Chart Summary and Explanations

the set temperature T˚, (T˚+2˚F or T˚+4˚F when set on body sensor):
(THERMO. OFF)
(THERMO. ON)
MORE THAN
5 MINUTES
3 MINUTES
ON OFF
ON OFF
SET SPEED
Compressor ON
Compressor OFF
II-2
2. Processes and functions
ROOM TEMP.
THERMO. ON
MORE THAN
5 MINUTES
ON
ON
1133_THS_I
Fig. 1
SM831148