Application guidelines
10
FRCC.PC.002.A5.22
Electrical connections and wiring
Voltage application range
Single phase electrical
characteristics
Nominal capacitor values
and relays
* PSC: Permanent Split Capacitor
CSR: Capacitor Start Run
(1) Run capacitors: 440 volts
(2) Start capacitors: 330 Volts
Single phase motor
protection and suggested
wiring diagram
Single phase compressor motors are internally
protected by a temperature / current-sensing
bimetallic protector which senses the main and
start winding current as well as motor winding
temperature. If the motor were to be overloaded
and the protector trips, it might take up to several
hours to reset and restart the compressor.
Motor voltage code
Nominal voltage
Voltage application range
1
208-230 V / 1 / 60 Hz
187 – 253 V
3
200-230 V / 3 / 60 Hz
180 – 253 V
4
380-400 V / 3 / 50 Hz
460 V / 3 / 60 Hz
340 – 440 V (50 Hz)
414 – 506 V (60Hz)
5
220-240 V / 1 / 50 Hz
198 – 264 V
9
380 V / 3 / 60 Hz
342 – 418 V
LRA - Locked Rotor
Current (A)
MCC - Maximum
Continuous Current (A)
Winding resistance (Ω)
( ± 7 % at 68° F)
Motor Code
1
5
1
5
1
5
Winding
run
start
run
start
NTZ048
43.7
37
13.2
11
1.32
4.16
1.62
3.95
NTZ068
72
53
21
17
0.94
2.01
1.05
3.19
NTZ096
97
31
0.45
1.84
NTZ108
97
33
0.45
1.84
NTZ136
140
41
0.36
1.73
Models
PSC/CSR*
CSR only
Run capacitors (1)
Start capacitors (2)
Start
relay
(A) µF
(C) µF
(B) µF
50 Hz
NTZ048
20
10
100
RVA6AMKL
NTZ068
20
10
100
60 Hz
NTZ048
15
10
100
NTZ068
25
25
135
NTZ096
30
15
135
NTZ108
30
15
135
NTZ136
30
15
135
The trickle circuit provides the facility of heating
the compressor crankcase by feeding a small
current to the auxiliary winding and the run
capacitor (See the drawings in section “Electrical
connections and wiring”).
For the larger single phase compressor models
NTZ048-068, the use of the PTC crankcase heater
is recommended.
PSC wiring may be used for refrigerant circuits
with capillary tubes or expansion valves with
bleed ports. Pressure equalisation must be
ensured before start-up because of the low
starting torque characteristics of this system.
CSR wiring provides additional motor torque
at start-up, by the use of a start capacitor in
combination with the run capacitor. This system
can be used for refrigerant circuits with capillary
tubes or expansion valves. The start capacitor is
only connected during the starting operation, a
potential relay is used to disconnect it after the
start sequence.
Some applications with high differential pressure
can require a very high starting torque. For such
cases the CSR starting kit can be converted to a
very high starting torque kit by an additional start
capcitor of 100 μF parallel to the start capacitor of
the CSR kit. This configuration can also be used to
reduce erratic starting at unfavourable conditions
such as very low ambient temperature or weak
voltage.
Trickle circuit
PSC wiring
CSR wiring