II - 5
Processes and Functions
SM830063
2
1. Compressor Control
↑
60 ˚C
59 ˚C
58 ˚C
57 ˚C
56 ˚C
↓
Note 1 : When heating, if outdoor fan
≠
H , “current capacity increase allowed” is treated as “current capacity increase
inhibited”.
Note 2 : If the compressor maximum discharge temperature
]
100 ˚C (Liquid valve is ON), the “current capacity in-
crease allowed” is treated as “current capacity increase inhibited”.
(4)
Compressor discharge temperature protection control
When the discharge temperature of the P/C compressor is excessively increased (to around 108
°
C ), the AC
compressor stops if it is working at the same time; if the AC compressor is stopped, thermo-off or alarm message
appears. When the discharge temperature of the AC compressor is excessively increased (to around 108
°
C ), the
AC compressor stops. For each of the compressors, if the unit thermo-off 4 times to due discharge temperature
protection control within 5 minutes of starting, alarm message appears.
(5)
Compressor current control
The current for the 2 compressors is controlled separately.
1
Lock current control
If the current for an operating compressor increases to above the corresponding
value in the table below, an alarm message appears.
Compressor capacity
Lock current
50 Hz, 11.2 kw compressor
14.7 A
50 Hz, 14 kw compressor
20.4 A
2
Overload current
If the current for an operating compressor remains above the corresponding
value in the below table for 30 seconds, an alarm message appears.
Compressor capacity
Lock current
50 Hz, 11.2 kw compressor
12.3 A
50 Hz, 14 kw compressor
17.1 A
(6)
Warm up operation control
In initial operation after microcomputer initialization, and after reverse-cycle start control (explained in Section 3) and
4-way valve switching control (explained in Section 5), the AC compressor occasionally takes as long as 20 minutes
to start.
(7)
Outdoor liquid temperature control in cooling (High-pressure control)
1
Each area is monitored constantly, and if control moves into the thermo-off area, the unit thermo-off immedi-
ately. For the capacity decrease area, if it has been decreased once, it is not decreased again for 30 seconds.
2
This control is not performed during test operation.
3
Even if thermo-off, this control does not result in an alarm.
Outdoor heat exchange
Control
liquid temperature
Thermo-off
Current capacity decrease 3 steps
Current capacity increase inhibited
Current capacity increase allowed
