Panasonic Urban Multi MX1R Series Service Manual page 453

Outline of Control
3.1.8 Startup Control
Fixes the frequency at a low level for a certain period of time during compressor startup to prevent liquid
return.
[Startup control in cooling operation]
INV
SVP
Outdoor EV
Indoor EV
(Unit with
thermostat ON)
Outdoor fan
Indoor fan
Thermostat ON
[Startup control in heating mode]
INV
SVP
Outdoor
unit EV
Indoor EV
(Unit with
thermostat ON)
Outdoor
fan
Indoor fan
Thermostat ON
432
41Hz∗3
1 min
30 sec
200 (in retry: 1200,
second time: 2000)
Normal full operation
Provides fan control to maintain
high pressure in cooling operation.
Maximum 15 minutes (including 5 minutes of restart standby in stop mode)
When HP - LP < 0.196MPa, compressor turns on.
Equalization prior to startup
Startup control
Inverter charging
41Hz
1 min
30 sec
Startup controlling control
SH according to ∗2
Cancellation of 0 pulse
instruction to indoor
EV according to ∗5
0pls
Max .15min (including 5min for restart standby )
When HP-LP<0.196MPa compressor ON
Equalization prior to startup Startup control
Inverter charging
Startup control ends
when ∗1 is met
52Hz
20 sec delay
2000
Opens outdoor
unit EV when ∗2
is met
SH control
Complete startup
control according to ∗1
52Hz
20 sec delay
PI control according to ∗3
SC control
Hot start
Function UM Combination "MA1R Series" Using R-407C
PACD011001C2
∗1
Startup control ending conditions
DSHi>30
Th6 – Te>10
OR
Elapsed time of 15 minutes
LP<0.098MPa
∗2
Outdoor unit EV full-open conditions
Tc>Ta+10
& OR
Elapsed time of 10 minutes
Tcg>55deg
When condition ∗1 is met
∗3
Operates at 52 Hz after operating at
41 Hz for 1 minute.
(until PI control is activated in ∗1)
∗1
Startup control ending conditions
Elapsed time of 1 minute
DSHi>30
OR
OR
Th6 – Te>10
LP<0.098MPa
Elapsed time of 15 minutes
(local setting of 10 minutes)
(30 minutes in power ON)
∗2
SH control by outdoor unit EV
PI control activated at 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 ∗1 is met, the next
startup condition is reset to SHS=10.)
∗3
When returning to normal outdoor EV
control, the PI control is provided at
that opening degree.
∗5
Indoor unit EV 0 pls instruction
cancellation conditions
HP>1.47MPa
OR
When condition ∗1 is met
∗6
Defrost judgment is not conducted
during this control.
(V0808)
(V0809)