–
–
'14 • KX-SM-221
(4)
Defrost control
(a)
Temperature condition of defrosting
(i)
Start conditions
(Standard specification or cold region specification can be selected by switching the jumper
wire J.)
Defrost operation will start, when outdoor unit whose compressor is operating under heating mode has satisfied all
the following conditions.
)
When minutes of cumulative compressor operation time has passed since heating operation started.
)
When minutes of cumulative compressor operation time has passed since the previous defrosting ended.
)
When minutes has passed since the compressor turned ON from OFF status.
)
When minutes has passed since one outdoor fan turned ON from OFF status.
)
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 outdoor air temperature (sensed
by Tho-A) dropped below the defrosting start temperature in Fig. for minutes continuously
➁
When the suction pressure saturated temperature calculated by the low pressure (sensed by PSL) and the
outdoor air temperature (sensed by Tho-A) dropped below the defrosting start temperature in Fig. for
minutes continuously
TR:
Heat e
xchanger temperature (°C)
TA: Outdoor air temperature (°C)
TA: Outdoor air temperature (°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 temperature (°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
(ii)
End conditions
• Standard (J is shorted)
) When the temperature detected with both outdoor heat exchanger temperature thermistors (Tho-R and
Tho-R) is higher than ºC
) Or when minutes have elapsed since defrosting started.
• Cold region setting (J is open)
) When (Tho-R and Tho-R) >= 9ºC is satisfied, after 2 minutes and 30 seconds have elapsed since defrosting
started, and when either of following conditions is satisfied, the defrosting end operation starts.
a) minutes and 0 seconds have elapsed since the temperature of either Tho-R or Tho-R was ºC or
higher
b) The temperature of either Tho-R or Tho-R is 0ºC or higher.
c) minutes have elapsed since defrosting started.
2) When (Tho-R1and Tho-R2) < 9ºC is satisfied, after 2 minutes and 30 seconds have elapsed since defrosting
started, and when either of following conditions is satisfied, the defrosting end operation starts.
) minutes have elapsed since the temperature of either Tho-R or Tho-R was ºC or higher.
b) The temperature of either Tho-R or Tho-R is 0ºC or higher.
c) minutes have elapsed since defrosting started.
