Mitsubishi Heavy Industries SRK60ZJX-S, Technical Manual

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'10 • SR-T-091
e) 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 a), b), c) and e) above and the outdoor air temperature is 3°C or
less are satisfied (note that when the temperature for outdoor heat exchanger sensor (TH1) is -5°C or less: 62 rps or
more, -4°C or less: less than 62 rps), defrost operation is started.
2) Ending conditions (Operation returns to the heating cycle when either one of the following is met.)
a) Outdoor heat exchanger sensor (TH1) temperature: 13ºC or higher
b)
Continued operation time of defrosting → For more than 16 minutes and 50 seconds.
(7) Outline of cooling operation
(a) Operation of major functional components in Cooling mode
(b) Detail of control in each mode (Pattern)
1) Fuzzy operation
During the fuzzy operation, the air flow and the compressor speed are controlled by calculating the difference between
the indoor temperature setting correction temperature and the retum air temperature.
ON OFF OFF
OFF OFF OFF
ON
OFF
(few minutes ON)
OFF
(few minutes ON)
ON ON OFF
Thermostat ON Thermostat OFF Failure
Cooling
Compressor
Indoor fan motor
Outdoor fan motor
4-way valve
20~110rps
20~110rps
20~74rps
20~44rps
SRR35ZJ-S
20~74rps
20~74rps
20~55rps
20~34rps
SRR25ZJ-S
Model
Fan speed
Auto
MED
HI
LO
-20
-20 -15 -10 -5 0 5 10
-15
-10
-5
0
Outdoor air temperature ( ℃ )
O
ut
do
or
he
at
ex
ch
an
ge
r
te
m
pe
ra
tu
re
(
℃
)
-20
-20 -15 -10 -5 0 5 10
-15
-10
-5
0
Outdoor air temperature ( ℃ )
O
ut
do
or
he
at
ex
ch
an
ge
r
te
m
pe
ra
tu
re
(
℃
)
Defrost operation
start
Defrost operation
start
De
fro
st
op
era
tio
n s
tar
t t
em
pe
rat
ur
e
De
fro
st
op
era
tio
n s
tar
t t
em
pe
rat
ur
e
Models 20
～
35 Model 50
Max. 16 minutes and 50 seconds
Heating operation
¡ Defrast operation
̪
Depends on an operation condition, the time can be longer than 7 minutes.
2~7 minutes
̪
Hot keep operation