11
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MAINTENANCE
11.12.
SAFETY AND PROTECTION CONTROL
The safety and protective devices are equipped with the
unit to ensure dependable and long life operation.
Their functions should be carefully noted, and field
adjustment is not recommended, if the setting is maintained
at the point listed in the table.
!
Compressor protection
1. Fuse and thermal relay equipped in the control box cut
out each compressor operation when the current to the
compressor exceeds the setting
2. The internal thermostat embedded in the motor winding
cuts out each operation, when the temperature exceeds
the setting
3. The oil heater in the compressor prevents from oil
foaming during cold starting. This heater warms the oil,
while the compressor is stopped
!
Refrigeration Cycle
1. The high pressure switch and low pressure control
protect against excessive discharge pressure and
exceedingly low suction pressure. The switch and
control cut out compressor operation when discharge
pressure or suction pressure is abnormal.
2. The pressure relief valve is equipped on discharge gas
line. When high pressure exceeds the setting, gas
refrigerant will be discharged to prevent abnormal high
pressure
!
Condenser Fan Motor Protection
Fuse and internal thermostat are equipped
The internal thermostat embedded in fan motor winding
cut out fan operation and compressor operation, when
the temperature of the motor winding exceeds the
setting
!
Water Cooler
Pump interlock, freeze protection thermostat, low
pressure control and suction gas thermostat can protect
water cooler against water cooler freezing
Model
RCUE-AG1
40
50
60
70
80
100
120
140
150
180
200
240
270
300
330
360
400
For Compressor
High Pressure Switch
Manual Reset, Non-Adjustable ( One Switch for Each Compressor Motor )
Cut-Out
MPa
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
2,74
Low Pressure Switch
(Pressure Sensor)
Electronic Control
Cut-Out
MPa
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
0,05
Internal Thermostat for
Compressor
Manual Reset, Non-Adjustable ( One Switch for Each Compressor Motor )
Cut-Out
°
C
115
115
115
115
115
115
115
115
115
115
115
115
115
115
115
115
115
Cut- In
°
C
93
93
93
93
93
93
93
93
93
93
93
93
93
93
93
93
93
Compressor Motor
(380-415V/50Hz)
Fuse
A
125
125
125
160
125
125
125
160
125
125
160
125
160
125
160
125
160
Manual Reset, Adjustable ( One Three-Phase Set for Each Compressor Motor )
Thermal Relay
A
54
65
70
90
54
65
70
90
65
70
90
70
90
70
90
70
90
Manual Reset, Adjustable ( One Three-Phase Set for Each Compressor Motor )
Circuit Protector(Option)
A
112
136
136
160
112
136
136
160
136
136
160
136
160
136
160
136
160
Oil Heater
One Heater for Each Compressor Motor
Capacity
W
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
150
Discharge Gas Thermostat
( One for Each Cycle )
Cut-Out
°
C
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
Cut- In
°
C
110
110
110
110
110
110
110
110
110
110
110
110
110
110
110
110
110
CCP Timer
Non-Adjustable ( One Timer for Each Compressor )
Setting Time
S
180
180
180
180
180
180
180
180
180
180
180
180
180
180
180
180
180
Star-Delta
S
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
5
Unloading during Starting
S
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
For Control Circuit
Fuse
Capacity
A
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
For Refrigerant Circuit
( One for Each Circuit )
Pressure Relief Valve
Setting Pressure
MPa
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
3,0
Freeze Protection Thermostat
( One for Each Water Cooler )
Cut-Out
°
C
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Cut- In
°
C
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
Fan Motor ( 380-415V / 50Hz)
Fuse
A
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
12
Internal Thermostat
Cut-Out
°
C
135
135
135
135
135
135
135
135
135
135
135
135
135
135
135
135
135
Cut- In
°
C
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
82
Manual Reset, Adjustable ( One Three-Phase Set for Each Fan Motor )
Circuit Protector(Option)
A
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
