Application guidelines
19
FRCC.PC.004.A9.22
Electrical connections and wiring
Motor protection and
suggested wiring diagrams
The 3-phase compressors are protected by
an internal motor protector, connected to
the neutral point of the star connected stator
windings, the protector cuts out all 3-phases
simultaneously.
Note: once the overload protector has tripped it
may take up to 3 hours to reset and restart the
compressor.
For all 3-phase compressors, a PTC crankcase
heater is required.
Three phase electrical characteristics
Motor Code
LRA - Locked Rotor
Current (A)
MCC - Maximum
Continuous Current (A)
Winding resistance (Ω)
( ± 7 % at 68° F)
3
4
6
7
9
3
4
6
7
9
3
4
6
7
9
MT/MTZ018
38
20
-
-
-
9
5
-
-
-
2.29
9.18
3.34
-
-
MT/MTZ022
38
20
30
-
22.5
11
6
8.5
-
6.5
2.29
11.6*
3.34
-
7.15
MT/MTZ028
57
23
41
-
32
16
7.5
11.5
-
8.5
1.38
6.17
1.18
-
4.62
MT/MTZ032
60
25
44
22
35
18
8
13
5.5
9
1.29
6.32
1.97
9.90
3.33
MT/MTZ036
74
30
74
26
35
17
9
17
7
9.5
1.08
5.43
1.08
7.76
3.33
MT/MTZ040
98
38
74
-
-
22
10
18
-
-
0.87
3.97
1.08
-
-
MT/MTZ044
115
48.5
77
44
78
22
9.5
16
8.5
13
0.74
3.22
1.13
5.83
1.68
MT/MTZ050
115
48.5
77
44
78
25
11.5
19
10
13.5
0.72
3.35
1.39
5.83
1.68
MT/MTZ056
130
64
105
50
72
24
12
23
11
15
0.55
2.39
0.76
3.86
1.64
MT/MTZ064
137
64
124
-
72
29
14
25
-
17.5
0.57
2.39
0.76
-
1.64
MT/MTZ072
135
80
143
-
100
30
17
27
-
18.5
0.55
1.90
0.56
-
1.32
MT/MTZ080
140
80
132
-
102
36
19
29
-
22.5
0.48
1.90
0.56
-
1.30
MT/MTZ100
157
90
126
62
110
43
22
35
17
26
0.50
1.85
0.67
3.10
1.26
MT/MTZ 125
210
105
170
75
150
54
27
43
22
30
0.38
1.57
0.43
2.51
0.84
MT/MTZ 144
259
130
208
90
165
64
36
51
25
40
0.27
1.19
0.37
2.00
0.72
MT/MTZ 160
259
130
208
99
165
70
36
51
29
46
0.27
1.19
0.37
1.76
1.10
* Motor windings made of Aluminium wires.
Winding resistance
Winding resistance is the resistance between
indicated terminal pins at 68°F (resistance value
+/- 7%).
Winding resistance is generally low and it
requires adapted tools for precise measurement.
Use a digital ohm-meter, a ‘4 wires’ method and
measure under stabilised ambient temperature.
Winding resistance varies strongly with winding
temperature ; If the compressor is stabilised at a
different value than 68°F, the measured resistance
must be corrected with following formula:
a + t
amb
R
tamb
= R
68°F
a + t
68°F
t
68°F
: reference temperature = 68°F
t
amb
: temperature during measurement (°F)
R
68°F
: winding resistance at 68°F
R
amb
: winding resistance at t
amb
coefficient a= 234.5 copper wires motor
coefficient a= 232.6 aluminium wires motor
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