Outline of Control PACD011001C2
436 Function UM Combination “MA1R Series” Using R-407C
[Oil return control (heating operation)]
Oil return OUT ∗2 ∗3∗9
67Hz+OFF
20 sec delay
20 sec delay
PI control
PI control
PI control
PI control ∗5
50 sec
10 sec
15 sec
SC control
oil return,
defrost
preparing
signal output
Oil return
Acumulator
discharge
operation
Oil return
preparation flag
Oil return IN
INV
SVP
Outdoor
EV
Indoor EV
(Unit with
thermostat ON)
Outdoor fan
Indoor fan
4-way valve
OR
&
OR
DSHi < 20˚C 10
continuous seconds
Th6 – Te < 15˚C 10
continuous seconds
DSHi>30
Th6 – Te>10
LP<0.1MPa
Elapsed time of 10 minutes
[B]
ON/OFF by LP
Normal controlNormal
control
Control according to Tc
OFF Hot start
2 min
Elapsed time of
8 minutes
&
OR
Elapsed
time of
2 minutes
Elapsed time of 1 minute after
completion of oil return operation
OR
SH control
according
to ∗4
30 sec
52Hz+OFF
2000pls
500pls
&
OR
HP-LP<0.5Mpa
∗9
Completion condition for under preparation
of heating oil return.
∗2
Oil return operation ending conditions
∗3
Accumulator discharge operation ending conditions
∗4
LPSH control by outdoor unit EV
PI control activated when SHS = 10
(initial opening degree: 200 pls
In the case of an LP retry, the next PI control is
provided at SHS = 5.
When condition ∗3 is met, the next startup condition
is reset to SHS = 10.)
∗5
When returning to normal outdoor EV control, the
PI control is provided at that opening degree.
∗7
0 pls maintained after elapsed time of 15 seconds
until LP < 0.2 MPa
∗8
Opens receiver solenoid valve for 60 seconds 1
minute after the preparation mode is activated.
However, the valve is closed when Th6 – Te < 0.
(V0811)
2 min. elapsed
10 sec. elapsed since
preparation end
A
All indoor EV 1000pls (50sec) → 0pls (10sec) → End of preparation
operation to 4 way valve changeover → 0pls (15sec ∗7)
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