01-26
E
When satisfy the following conditions, the 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
6. LOW PRESSURE PROTECTION CONTROL (For Cooling mode)
7. Fan motor over temperatuer protection
<After the compressor start-up and 10 minutes has passed>
<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]
0.78MPaG
0.68MPaG
Release of protection
-3 rps every 1 minute
Pressure
(Fig 15 : Anti freezing protection)
(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.
0.05MPaG
0.02MPaG
Release of protection
Hold
Compressor stop
Pressure
(Fig 14 : Low pressure protection 1)
Hold
6-1. Low Pressure Protection 1
6-2. Low Pressure Protection 2
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.
a) Fan motor error displayed
b) Fan stop 40 secounds
c) Fan stop 50 secounds
8. Fan motor speed restriction by Room temperature (Suction temperature) (72 type only).
5. HIGH PRESSURE PROTECTION
When the pressure switch becomes OFF (Open : higher than 4.2 MPaG),
the compressor is stopped.
It is released when the pressure switch becomes ON (Close : lower than 3.2 MPaG)
after 3 minutes of compressor stop.
When the room temperature is 40 or more and the fan rotation speed is 1230 rpm or more for
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.
