Panasonic Urban Multi MX1R Series, Service Manual, Page: 453 / 643

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