-
169
-
2) Procedure to change defrosting start condition
Turn SW5-1 on the outdoor unit PCB ON.
a) When cumulative operating time of compressor elapses 30 minutes or more after the previous defrosting operation
ended.
b) When the outdoor heat exchanger temperature (detected by Tho-R) is -7°C or lower for 30 seconds continuously.
c) Other conditions except a) and b) are same as the standard conditions.
3) Defrosting end conditions
When either of following condition is established, the defrosting end operation starts.
a) If 10 minutes
(1)
have passed since defrosting started.
b) If the temperature at the outdoor heat exchanger thermistor (Tho-R) is 12ºC.
(g) Compressor protective control
(i) Discharge pipe temperature control
If the discharge pipe temperature (detected by Tho-D) exceeds the set value, the compressor speed is controlled in order
to prevent the discharge pipe temperature from rising. If it continues to rise anyway, the compressor is stopped.
1) Compressor speed (Expansion valve) control
(f) Defrosting
1) Defrosting start conditions
Defrosting operation starts when all the following conditions are satisfi ed.
a) If
45
(35)
(1)
minutes of cumulative compressor operating time have passed since defrosting ended and 30 minutes of
cumulative compressor operating time have passed since heating operation started. (Remote controller: ON)
b) 5 minutes passes after the compressor start-
ed.
c) 5 minutes passes after the outdoor fan ran.
d) After all the above conditions are satisfi ed,
when the temperature detected by the outdoor
heat exchanger temperature thermistor (Tho-
R) and ambient air temperature thermistor
(Tho-A) drops below the dehumidifying op-
eration start temperature shown in the figure
at right for 30 seconds continuously.
Note (1) Values in ( ) show in the case of the 251 model.
—5
—2
—10
—15
—14
—20
—20 —18
—15
—10
—5
0
5 6
10
Outdoor heat exchanger temperature (˚C) [Tho-R]
Ambient air temperature (˚C) [Tho-A]
—7
Defrosting operation start temperature SW5-1 ON
Defrosting operation start
temperature zone
Defrosting op
eration start t
emperature (S
tandard
)
Retention
The compressor speed is
reduced every 30 seconds.
Release
Discharge pipe temperature (˚C)
80
90
