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2 When the temperature difference RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub)
RT13 in the indoor unit is 4deg. or more for a fixed time at cool or dry operation, the target discharge temperature is
changed. After the temperature is changed, when temperature difference RT is 6deg. or more, the target
temperature is changed again. The LEV opening is controlled based on the changed target discharge temperature
and the temperature difference RT.
Ta (F-)
more than Tb+18
Tb+9 to Tb+18
Tb+4 to Tb+9
Tb-4 to Tb+4
Tb-9 to Tb-4
Tb-18 to Tb-9
less than Tb-18
less than 4deg.
(Pulse)
20
10
2
0
-2
-5
-10
NOTE : Discharge temperature : Ta, Target discharge temperature : Tb
6deg. or more
(Pulse)
60
20
10
0
-2
-5
-10
RT
4deg. or more and less than 6deg.
(Pulse)
60
20
10
0
-2
-5
-10
The target discharge temperature (Tb) is set according to the operation mode or the unit status as follows.
Tb (-F)
171
144
136
COOL (Normal)
COOL ( RT is less than 4deg., or RT is 4deg. or more and less than 6deg..)
COOL ( RT is 6deg or more.)
NOTE : Target discharge temperature : Tb
Operation mode
NOTE : When the discharge temperature (Ta) is 122°F or less on the cool operation LEV opening is set in 54 pulse.
When this state continues for 20 minutes, the compressor is stopped and restarts in 3 minutes.
When the compressor is stopped, the indoor unit indicates the abnormality of refrigerant system and stops.
(OPERATION INDICATOR lamp is 10-time flashing on and off.)
NOTE : Opening increases and decreases to be in the target discharge temperature during operation.
Opening
completely
Positioning
Power ON
Initial opening
Standard opening
Remote
controller
ON
➔
Operation
Thermostat
OFF
Standard opening
Thermostat
ON
Opening in stop
Initial opening
Operation
Opening in stop
Remote
controller
OFF
Opening
completely
Remote
controller
ON
➔
Positioning
Initial opening
Standard opening
Operation
Time
LEV opening
Open
Close
(2) LEV time chart
OB311--1.qxp 04.1.13 9:53 AM Page 24