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13
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4.9 Outline of heating operation
(1)
Operation of major functional components in heating mode
(2)
Details of control at each operation mode (pattern)
(a)
Fuzzy operation
Deviation between the room temperature setting correction temperature and the suction air temperature is calculated in
accordance with the fuzzy rule, and used for control of the air capacity and the inverter speed.
When the defrosting, protection device, etc. is actuated, operation is performed in the corresponding mode.
(b)
Hot keep operation
If the hot keep operation is selected during the heating operation, the indoor blower is controlled based on the temperature of
the indoor unit heat exchanger (Th2) to prevent blowing of cool wind.
ON
OFF
ON
ON
ON
OFF
(few minutes ON)
ON
ON(HOT KEEP)
OFF
OFF
(3 minutes ON)
OFF
OFF
Thermostat ON
Thermostat OFF
Failure
Heating
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
12~106rps
12~120rps
12~106rps
12~120rps
12~74rps
12~90rps
12~42rps
12~58rps
SRK50ZHX-S
Model
Fan speed
SRK60ZHX-S
Auto
MED
HI
LO
(3) Defrosting operation
(a)
Starting conditions (Defrosting operation can be started only when all of the following conditions are met.)
1
After start of heating operation
When it elapsed 35 minutes. (Accumulated compressor operation time)
2
After end of defrosting operation
When it elapsed 35 minutes. (Accumulated compressor operation time)
3
Outdoor unit heat exchanger sensor (Th4) temperature
When the temperature has been below –5ºC for 3 minutes continuously.
4
The difference between the outdoor air sensor temperature and the outdoor unit heat exchanger sensor temperature
¡
The outdoor air temperature _ -2°C : 7°C or higher
¡
-15°C _ The outdoor air temperature < -2°C : 4/15
×
The outdoor air tempe 7°C or higher
¡
The outdoor air temperature < -15°C : -5°C or higher
5
During continuous compressor operation
In addition, when the speed command from the indoor controller of the indoor unit during heating operation has counted
0 rps 10 times or more and all conditions of
1
,
2
,
3
and
5
above and the outdoor air temperature is 3°C or less are
satisfied (note that when the temperature for Th4 is -5°C or less: 62 rps or more, -4°C or less: less than 62 rps), defrost
operation is started.
(b)
Ending conditions (Operation returns to the heating cycle when either one of the following is met.)
1
Outdoor heat exchanger sensor (Th4) temperature: 10ºC or higher
2
Continued operation time of defrosting
→
For more than 15 min.
