–
286
–
(c) Fan control during heating
During heating, fan speed is controlled in accordance with the low pressure (sensed by PSL).
(i) Initial fan speeds are as follows.
• Outdoor fan initial speed during heating
Model Speed
All models 6th speed
(ii) During normal operation, the speed is changed in accordance with the low pressure value.
(4) Defrost (Defrost control)
• Temperature condition of defrosting
(a) Start conditions
(Standard specification or cold region specification can be selected by switching the jumper wire J15.)
Defrost operation will start, when outdoor unit whose compressor is operating under heating mode has satisfied all the
following conditions.
(i) When 33 minutes of cumulative compressor operation time has passed since heating operation started.
(ii) When 33 minutes of cumulative compressor operation time has passed since defrosting ended.
(iii) When 8 minutes has passed since the compressor turned ON from OFF status.
(iv) When 8minutes has passed since one outdoor fan turned ON from OFF status.
(v) After all above conditions have been met, when any of the following conditions is satisfied.
➀
When the outdoor heat exchanger temperature (sensed by Tho-R) and the ambient air temperature (sensed by
Tho-A) dropped below the defrosting start temperature in Fig. 1 for 30 seconds continuously
➁
When the suction pressure saturated temperature calculated by the low pressure (sensed by PSL) and the ambient
air temperature (sensed by Tho-A) dropped below the defrosting start temperature in Fig. 2 for 30 seconds
continuously
TR: Heat exchanger temp. (°C)
TA: Ambient air temp. (°C)
TA:
Ambient air temp. (°C)
Fig. 1
Cold region
Standard
(Factory setting)
Defrost start zone
-2
-6
-15
-19
-21
-25
-20 -15 6
Without J15
Cold region specification
With J15
SST: Suction pressure saturated temp. (°C)
Fig. 2
Cold region
Standard
(Factory setting)
Defrost start zone
-6
-10
-19
-23
-25
-29
-20 -15 6
Without J15
Cold region specification
With J15
(b) End conditions
Defrosting operation stops when any of the following conditions is satisfied.
(i) When 12 minutes has passed since defrost started
(ii) When the outdoor heat exchanger temperature (sensed by Tho-R) is detected 12°C or higher continuously for 10
seconds
(iii) When it has detected the high pressure (HP) ≥ 3.0MPa
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