Rheem RHMV2421MNACJA Service Manual page 121

5. HEATING OPERATION
Switch airflow [AUTO], and an indoor fan motor will run
according to room temperature as below.
Airflow changeover ( Heating : Auto )
When room temperature rises
TR-Ts > -2°F
=
(-1°C)
-2°F > TR-Ts > -4°F
=
(-1°C) (-2°C)
-4°F > TR-Ts
(-2°C)
6. COOL AIR PREVENTION CONTROL (Heating mode)
The maximum value of the indoor fan speed is set as shown in Fig.7, based on the detected
temperature by the indoor evaporator coil sensor on heating mode.
When the compressor does not operate, the indoor fan motor operates [S-Lo] mode.
Indoor evaporator coil
temperature
SETTING
FAN MODE
98.6°F
(37°C)
Lo mode*
84.2°F
(29°C)
S-Lo
*On the Quiet mode,
the Quiet mode is kept.
When room temperature falls
TR-Ts > -3°F
Low
Me
-3°F > TR-Ts > -5°F
(-1.5°C)
High
-5°F > TR-Ts
(-2.5°C)
I ndoor evaporator coil
t emperature
98.6°F
(37°C)
13 min. later
84.2°F
(29°C)
04-13
=
(-1.5°C)
=
(-2.5°C)
TR : Room temperature
Ts : Set temperature
SETTING
FAN MODE
Lo mode*
Lo mode*
*On the Quiet mode,
the Quiet mode is kept
.