Fujitsu AOYG45LAT8 User Manual page 46

HIGH PRESSURE PROTECTION 2
<Start condition>
High pressure sensor detects more than 4.10MPa.
<Operation>
Compressor is stopped.
<Release condition>
When the high pressure sensor detects lower than 3.00MPa
and after 3 minutes ST, the compressor restarts.
HIGH PRESSURE PROTECTION 3
<Start condition>
When the pressure switch becomes OFF (Open : more than 4.2 MPa / 609.2 psi), the compressor is stopped.
<Operation>
Compressor is stopped.
<Release condition>
When the pressure switch becomes ON (Close : lower than 3.2 MPa / 464.1 psi) and after 3 minutes ST,
the compressor restarts.
6. LOW PRESSURE PROTECTION CONTROL
LOW PRESSURE PROTECTION 1 (For Cooling, Dry and Heating mode)
<Start condition>
After the compressor operates for 1 minute, and low pressure sensor
detects lower than 0.05MPa for 5 minutes.
<Operation>
Compressor is stopped.
<Release condition>
Compressor restarts after 3 minutes ST.
If the Low pressure protection 1 operates 5 times within 2 hours,
Low pressure error will occur. <Permanent stop>
An error code is displayed each controller, it is reset by only the main power supply reset.
LOW PRESSURE PROTECTION 2 (For Heating mode)
<Start condition>
The compressor operates for 10 minutes, and low pressure sensor
detects lower than 0.16MPa for 1 minute.
<Operation>
The compressor speed -5rps every 60 seconds till the
release condition.
If the compressor operates at minimum speed for 60 seconds,
and the release condition isn't met, the compressor is stopped.
<Release condition>
Low pressure sensor detects more than 0.18MPa,
and after 3 minutes ST.
High
pressure
4.10MPa
3.00MPa
Low
pressure
0.05MPa
Low
pressure
0.18MPa
0.16MPa
01-45
( Fig. 28 : High pressure protection 2 )
Compressor stop
Hold
Release of protection
( Fig. 29 : Low pressure protection 1 )
Release protection 1
Compressor stop
(When continues for 5 minutes)
( Fig. 30: Low pressure protection 2 )
Release protection 2
Compressor speed -5 every 60 sec.
Compressor stop
(When continues for 1 minutes)