Mitsubishi Heavy Industries SRK28HJ Technical Manual page 20

S SRK40HJ
(a) Defrost Start
Changes in the difference in temperature between the intake air temperature and the indoor heat exchanger temperature
causes frost to build up, at which time defrosting begins. However, defrosting will not occur when the total compressor
operation time or time after defrosting has ended is 40 minutes.
(b) Defrost End (heat exchanger temperature or timer)
1) What the heat exchanger temperature (detected by 23DH) reaches the value given below, defrosting is ended and
heating operation is returned to. Preset values: 14C˚
2) Operation will also return to heating operation when more then 10 minutes has passed since the starting of defrosting operation.
Device operation during defrosting
Indoor Fan
Operation Lamp
Flashing
52 C
(Compressor)
52 X
4
(4 Way Valve)
Outdoor Fan
(15) Forced defrosting
To test forced defrosting in the operation test mode, the unit may be operated once in the forced defrost mode as shown below.
(1) Temporarily turn off the power source and then perform the following operation using the remote controller within 20
seconds after the power is turned back on.
Operation
Fan speed
Operation setting
Temperature setting : 19
(2) Defrost end
SSRK28HJ
When remote control operation is performed, defrosting will begin after the 3 minute timer operation ends. After 3 minutes
all operations will stop.
S SRK40HJ
When the remote control operation is performed, forced defrosting will start for 1 minute after the three minute timer opera-
tion ends. After that the defrost thermostat(23DH) will either tum OFF or the operation will stop after 10 minutes.
(16) High-Pressure Control
The indoor heat exchanger sensor detection temperature controls the outdoor fan and compressor.
S SRK28HJ
¡ When the Indoor Heat Exchanger
Temperature Is ≥ 54˚C
Outdoor fan
48
Indoor Heat Exchanger Temperature (˚C)
Hot
Keep
ON
OFF
Lit
ON
OFF
ON
OFF
ON
OFF
seconds
1 minute
Start Defrosting
: Run Air flow
: Low Timer switch : On timer (
: Heating On time
=
54
-
10 minutes or 23DH OFF
End Defrosting
: Swing
)
: 3H
¡ When the Indoor Heat Exchanger
Temperature Is ≥ 61˚C
=
Compressor
Outdoor fan
48
Indoor Heat Exchanger Temperature (˚C)
18
-
: http://splitoff.ru/tehn-doc.html
Hot
Keep
2 minutes
61