Compressor Stop Control - Fujitsu ARYG72LHTA Service Instruction

6. HIGH PRESSURE PROTECTION
When the pressure switch becomes OFF (Open : higher than 4.2 MPa),
the compressor is stopped.
It is released when the pressure switch becomes ON (Close : lower than 3.2 MPa)
after 3 minutes of compressor stop.
7. LOW PRESSURE PROTECTION CONTROL (For Cooling mode)
7-1. Low Pressure Protection 1
<After the compressor start-up and 1 minute has passed>
(a).The detected value of pressure sensor is 0.02MPaG or less,
continues for 5 minutes, the compressor is stopped.
(b). When 7 minutes has passed and low pressure sensor detects
value is more than 0.05MPaG after the protection stop by (a),
the compressor restarts.
(c).When the protection (a) operates 5 times within 2 hours after the
restart by (b),
the error is displayed and the compressor stops. [Permanent stop]
7-2. Low Pressure Protection 2
<After the compressor start-up and 10 minutes has passed>
(a).When the low pressure value becomes 0.68MPaG or less
continues for 1 minute, the compressor speed -3 rps.
(b). When the low pressure value becomes 0.68MPaG or less
after the protection (a), the compressor continues speed -3 rps
every 1 minute until the detected value becomes more than
0.68MPaG.
(c). When the low pressure value becomes more than 0.78MPaG,
this protection is released.
8. Fan motor over temperatuer protection
When satisfy the following conditions, the protection works.
E
a) After the 90 seconds from the fan operation, detect less than 300 rpm for 10 seconds.
b) IPM trip protection works.
c) Current overload protection works.
When detecting the above condtion, recheck the condition after 6 minutes.
When count the twice, the protection works
Protection contents
Reduce the static pressure 20 Pa
When it does not dissolve even the minimum static pressure condition, work the following operation
a) Fan motor error displayed
b) Fan stop 40 secounds
c) Fan stop 50 secounds
9. Fan motor speed restriction by Room temperature (Suction temperature) (72 type only).
When the room temperature is 40
60 seconds, the fan rotation speed is limited to 1220 rpm.
The fan rotation speed is limited, and it will be released after 60 minutes have elapsed.
or more and the fan rotation speed is 1230 rpm or more for
01-21
(Fig 13 : Low pressure protection 1)
Pressure
Release of protection
0.05MPaG
Hold
0.02MPaG
Compressor stop
(Fig 14 : Anti freezing protection)
Pressure Release of protection
0.78MPaG
Hold
0.68MPaG
-3 rps every 1 minute