Panasonic Urban Multi MX1R Series Service Manual page 457

Outline of Control
[Oil return control (heating operation)]
PI control
INV
SVP
PI control
10 sec
Outdoor
50 sec
EV
Indoor EV
(Unit with All indoor EV 1000pls (50sec) → 0pls (10sec) → End of preparation
operation to 4 way valve changeover → 0pls (15sec ∗7)
thermostat ON)
Normal
control
Outdoor fan
Indoor fan
4-way valve
oil return,
defrost
preparing
signal output
2 min
Oil return Oil return IN
preparation flag
436
Oil return OUT ∗2
∗9
[B]
20 sec delay
67Hz+OFF
52Hz+OFF
30 sec
ON/OFF by LP
SH control
according
2000pls
to ∗4
15 sec
500pls
Control according to Tc
Hot start
OFF
A
Acumulator
discharge
Oil return
operation
∗2
∗3
Oil return operation ending conditions
PI control
OR
20 sec delay
∗3
Accumulator discharge operation ending conditions
PI control ∗5
OR
SC control
∗4
Normal control
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.
∗9
Completion condition for under preparation
of heating oil return.
&
Function UM Combination "MA1R Series" Using R-407C
PACD011001C2
Elapsed time of
8 minutes
DSHi < 20˚C 10
continuous seconds
OR
Th6 – Te < 15˚C 10
continuous seconds
&
Elapsed
time of
2 minutes
Elapsed time of 1 minute after
completion of oil return operation
&
DSHi>30
OR Th6 – Te>10
LP<0.1MPa
Elapsed time of 10 minutes
2 min. elapsed
10 sec. elapsed since
preparation end
OR
HP-LP<0.5Mpa
(V0811)