11
50 Hz
PSC/CSR*
CSR only
Models
Run
capacitors
(1)
Start
capacitors
(2)
Start
relay
(A) μF
(C) μF
(B) μF
NTZ048
20
10
100
3ARR3J4A4
NTZ068
20
10
100
60 Hz
PSC/CSR*
CSR only
Models
Run
capacitors
(1)
Start
capacitors
(2)
Start
relay
(A) μF
(C) μF
(B) μF
NTZ048
15
10
100
3ARR3J4A4
NTZ068
25
25
135
NTZ096
30
15
135
NTZ108
30
15
135
NTZ136
30
15
135
ELECTRICAL CONNECTIONS AND WIRING
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 wind-
ing 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.
The standard CSR wiring system pro-
vides additional motor torque at start-
up, by the use of a start capacitor in
combination with a run capacitor. The
start capacitor is only connected dur-
ing the starting operation and a poten-
tial relay disconnects it after the start
sequence. This sytem can be used for
refrigerant circuits with capillary tubes
or expansion valves.
Single phase
PSC wiring
with trickle circuit
IOL
Motor
protector
A & C
Run
capacitors
C
Common
S
Start winding (auxiliary)
R
Run winding (main)
