Fujitsu AMUG24LMAS Service Manual page 142

5. HIGH PRESSURE PROTECTION
AOUG36/48LMAS1
During the compressor operation, when detect the condition of the following table value,
the protection function will be worked.
The operation condition varies according to the compressor speed.
The protection function is, the compressor speed is descreased 7 rps every 60 seconds.
When the outdoor unit discharge pressure sensor rises above 580.2 psi (4 MPa), the
compressor will stop.
Cooling operation
Compressor frequency[rps]
<
= 20
rps
<
20< = 90
rps
<
90< = 100
rps
Heating operation
Compressor frequency[rps]
<
= 20
rps
<
20< = 90
rps
<
90< = 100
rps
100<
rps
HP : Detected discharge pressure sensor value.
rps : Detected compressor frequency.
6. COMPRESSOR TEMPERATURE PROTECTION
AOUG36/48LMAS1
Compressor temperature sensor is monitoring the compressor Temperature 1.
When the compressor temperature sensor detects higher than Temperature 1, the compressor
is stopped.
When 3 minutes has passed from the compressor stop and the compressor temperature sensor
detects lower than Temperature 2, protection is released and compressor will restart.
Operation value
AOUG36LMAS1
AOUG48LMAS1
Operation value[psi(MPa)]
HP> = 500.38psi(3.45MPa)
HP> = 551.14psi(3.80MPa)
HP> = 478.62psi(3.30MPa)
Operation value[psi(MPa)]
HP> = 500.38psi(3.45MPa)
HP> = 507.63psi(3.50MPa)
HP> = 478.62psi(3.30MPa)
HP> = 449.62psi(3.10MPa)
Temperature 1 Temperature 2
226 °F 176 °F
(108 °C) (80 °C)
04-35
Release value[psi(MPa)]
HP> = 471.37psi(3.25MPa)
HP> = 522.14psi(3.60MPa)
HP> = 449.62psi(3.10MPa)
Release value[psi(MPa)]
HP> = 471.37psi(3.25MPa)
HP> = 478.62psi(3.30MPa)
HP> = 449.62psi(3.10MPa)
HP> = 420.61psi(2.90MPa)