Outline Of Cooling Operation - Mitsubishi Heavy Industries SRK20ZD-S1 Technical Manual

¡ 50 type
Indoor unit
Indoor fan
RUN light
Outdoor unit
Inverter
command
Outdoor fan
4-way valve
Note (1) When outdoor unit heat exchanger sensor (Th4) temperature becomes 7°C or higher, inverter instruction changes 70 rps to 50
rps.
3) Ending conditions (Operation returns to the heating cycle when either one of the following is met.)
1 Outdoor heat exchanger sensor (Th4) temperature: 13ºC or higher (50 type: 20°C or higher)
2 Continued operation time of defrosting → For more than 10 min.
(v) Heating "HI POWER" operation (HI POWER button on remote controller: ON)
Operation is maintained for 15 minutes with a higher blow out air temperature.
¡ Detail of operation
Item
Inverter speed
Indoor fan
Outdoor fan
Notes (1) Room temperature is not adjusted during the HI POWER operation.
(2) Protective functions will actuate with priority even during the HI POWER operation.

(7) Outline of cooling operation

(a) Operation of major functional components in Cooling mode
Functional
components
Indoor fan motor
Flaps
Display
52C
Outdoor fan motor
4-way valve
Electronic expansion valve
Corresponding
to speed
OFF
ON
Flashing
(Hot keep)
Fuzzy calculated
value
0
Corresponding
to speed
OFF
ON
OFF
Defrost operation
preparation
Defrost operation
Model
SRK20ZD-S1
100 rps
Item
When the inverter
speed is 0rps
ON
ON or OFF
Lights up
ON
OFF (20, 25, 35 type)
Depending on the stop mode (50 type)
Depending on the stop mode
Hot keep
70 rps
(1)
2nd speed 2nd speed
75 sec.
60 sec.
Defrost end
(Th4 > = 20°C, 10 minutes)
Defrost control
SRK25, 35ZD-S1
102 rps
Hot keep M mode (max 8th speed)
4th speed
When the inverter speed
is other than 0rps
ON
ON or OFF
Lights up
ON
ON
ON
Depending on the EEV control
19
- -
Hot keep
Final defrost operation
Normal heating operation restored
SRK50ZD-S1
120 rps
Hot keep M mode (max 7th speed)
2nd speed
When the inverter speed is 0rps
due to an anomalous stop
OFF
Stop position control
Lights up or flashes
OFF after stop mode
OFF (20, 25, 35 type)
Depending on the stop mode (50 type)
Depending on the stop mode