Fujitsu AUXB12GA* H - Low Pressure Protection

02-20
Protective function Detect device
Operation
Cool Heat
Low pressure
protection 1
Low pressure
sensor
Abnormal low
pressure
protection
control
Low pressure
sensor
Low pressure
protection stop
Low pressure
sensor
Low pressure
sensor
Low pressure
protection 2
Low pressure
protection 3
Low pressure
sensor
Display
P3
EA51
2-7-3 Low pressure protection
Start condition Release condition
Below 0.10MPa 3minutes elapsed and
Above 0.17MPa
SV1 =>ON
After compressor started
and 3 minutes elapsed
and Below 0.18MPa
3minutes elapsed and
above 0.22MPa
Operating Indoor unit EEV
forced controlling
-Thermo-OFF indoor unit:
450pls.
-Thermo-ON indoor unit:
gradually opens.
Below 0.13MPa and
SH* above 10 C and
EEV1 (EEV2) is operating
with less than 52pls.
*SH = Heat-Ex1(2) Gas
temp - Low pressure
saturation temp.
Except the start condition EEV1 (EEV2) set 52 plus
Below 0.16MPa 3minutes elapsed and
above 0.18MPa
Compressor rotation speed
lessen in the limited time until
above 0.17Mpa (Compressor
rotation speed rise up prohibit)
Pattern 1
Below 0.05MPa or
0.10MPa for 10minutes.
3minutes elapsed and
Above 0.17Mpa
Corresponding outdoor unit
stops
Pattern 2
Pattern 1 generated 5
times within 180 minutes
Error reset (push button
SW) executed after power
turned on
Corresponding outdoor unit
stops (Permanent stop) &
Error display
R
R
*
LPP Stop : Error Indication EA 51
* for a 10 Minutes
Protection controlling range in cooling / heating operaing mode
R
S
R
S
R
LP Protection1 : SV1 ON
LP protection 3: EEV1(2) set as 52 pls
*When EEV puls is less than 52 pls.
(Only heating)
Abnormal LP protection :
Compressor rotation speed forced cntrolling
LP Protection2 :
Indoor unit (Heating/ Thermo OFF) EEV
S
S
S
0.05 0.10 0.13 0.16 0.17 0.18 0.22 (MPa)
foced controlling
Note: Target pressure controlling will be cancelled when the operating pressure is in the range of orange.
Low pressure protection - Summary -