Panasonic Urban Multi MX1R Series Service Manual page 456

PACD011001C2
[Oil return control (cooling operation)]
PI control
INV
SVP
Outdoor EV
SH control
Indoor EV
(Unit with
thermostat ON)
Normal control
Outdoor fan
Indoor fan
4-way valve
oil return,
defrost
preparing
signal output
2 min
Oil return
preparing flag
Function UM Combination "MA1R Series" Using R-407C
Oil return OUT
∗2
[B]
ON/OFF by LP
2000pls
1000pls ∗4
Control according to Tc
Oil return
Oil return IN
∗3
PI control
67HzrOFF
(upper limit)
20 sec delay
30 sec
200pls SH control
Normal control
Acumulator
discharge
operation
Outline of Control
∗2
Oil return operation ending conditions
Elapsed time of
8 minutes
DSHi < 20˚C 10
continuous seconds
OR
OR
Th6 – Te < 15˚C 10
continuous seconds
&
Elapsed
time of
1 minute
∗3
Accumulator discharge operation
ending conditions
Elapsed time of 1 minute after
completion of oil return operation
&
DSHi>30
OR
OR
Th6 – Te>10
LP<0.1MPa
Elapsed time of 10 minutes
∗4
Oil return signal only is sent from
Outdoor unit.
(V0810)
435