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
2-9-3 Low pressure protection
Start condition Release condition
Below 15psi (0.10MPa) 3minutes elapsed and
Above 25psi (0.17MPa)
SV1 =>ON
After compressor started
and 3 minutes elapsed
and Below 94psi (0.18MPa)
3minutes elapsed and
above 32psi (0.22MPa)
Operating Indoor unit EEV
forced controlling
-Thermo-OFF indoor unit:
450pls.
-Thermo-ON indoor unit:
gradually opens.
Below 19psi (0.13MPa)
and SH* above 50 F (10 C)
and EEV1 (EEV2) is oper-
ating with less than 52pls.
*SH = Heat-Ex1(2) Gas
temp - Low pressure
saturation temp.
Except the start condition EEV1 (EEV2) set 52 plus
Below 23psi (0.16MPa) 3minutes elapsed and
above 94psi (0.18MPa)
Compressor rotation speed
lessen in the limited time until
above 25psi (0.17Mpa)
(Compressor rotation speed
rise up prohibit)
Pattern 1
Below 7psi (0.05MPa) or
15psi (0.10MPa) for 10min.
3minutes elapsed and
Above 25psi (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
S
R
*
LPP Stop : Error Indication E A 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/Heating Main)
Abnormal LP protection :
Compressor rotation speed forced cntrolling
LP Protection2 :
Indoor unit (Heating/ Thermo OFF) EEV
S
7 15 19 23 25 94 32 (psi)
foced controlling
Note: Target pressure controlling will be cancelled when the operating pressure is in the range of orange.
S
Low pressure protection - Summary -
0.05 0.10 0.13 0.16 0.17 0.18 0.22 (MPa)
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