PACD011001C2 Outline of Control
Function UM Combination “MA1R Series” Using R-407C 435
[Oil return control (cooling operation)]
Oil return OUT
∗2
∗3
67HzrOFF
(upper limit)
20 sec delay
PI control
PI control
30 sec
2000pls
1000pls ∗4
200pls
SH control
Oil return
Acumulator
discharge
operation
Oil return
preparing 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
SH control
Control according to Tc
2 min
Elapsed time of
8 minutes
&
OR
Elapsed
time of
1 minute
Elapsed time of 1 minute after
completion of oil return operation
OR
∗2
Oil return operation ending conditions
∗3
Accumulator discharge operation
ending conditions
∗4
Oil return signal only is sent from
Outdoor unit.
(V0810)
oil return,
defrost
preparing
signal output
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