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'14 • KX-SM-204
(4) Defrosting (Master unit/Slave unit)
If the defrost starting conditions at the outdoor heat exchanger are established, defrost operation starts.
(a) Temperature conditions for defrosting
(i) Conditions for starting defrost
When all of following conditions are satisfied, defrost operation will be started.
) When the cumulative operation time
of the compressor becomes minutes
after completion of previous defrost
operation, or it becomes minutes after
heating operation starts.
) When minutes have elapsed after one
compressor is turned ON from the state
of all compressors OFF.
) When minutes have elapsed after one
outdoor fan is turned ON from the state
of all outdoor fan OFF.
)
When either of following conditions is established after all of the above conditions are satisfied.
• When the temperatures detected with the outdoor heat exchanger temperature thermistor (Tho-R,-R) and
outdoor air temperature thermistor (Tho-A) are below the defrost starting temperature mentioned in the above
graph continuously for minutes.
• When the suction pressure saturation
temperature has continued for minutes
in the defrost zone which is determined
by the outdoor air temperature sensor
(Fig. )
(ii) Conditions for finishing defrost
• 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.
a) 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.
-20
-15
6
J15 opened
Cold region
specification
J15 shorted
Outdoor air temp. (ºC) [Tho-A]
Cold region
Defrost start zone
Standard
(Factory setting)
Heat exchanger temp. (°C) [Tho-R]
Fig.1
-2
-6
-15
-19
-21
-25
-20
-15
6
J15 opened
Cold region
specification
J15 shorted
Outdoor air temp. (ºC) [Tho-A]
Cold region
Defrost start zone
Standard
(Factory setting)
5WEVKQPRTGUUWTGUCVWTCVKQPVGORGTCVWTG
°C
Fig.2
-6
-10
-19
-23
-25
-29
