Low Pressure Protection - Fujitsu AUXB04GALH Service Manual

2-7-3 Low pressure protection

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