Nominal Capacitor Value And Relays; Three Phase - Danfoss MLZ Selection & Application Manuallines

A
PPLICATION GUIDELINES
CSR wiring
Nominal capacitor value
and relays
Compressor models
MLZ/MLM015-019-021-026
220-240 V /1/50 Hz
MLZ/MLM030
Motor voltage code 5
MLZ/MLM038-045-048
MLZ/MLM019-021
MLZ/MLM026
208-230 V / 1 / 60 Hz
Motor voltage code 1
MLZ/MLM030-033
MLZ/MLM038

Three phase

Suggested wiring diagram with
"one shot" pump down cycle
and safety lock-out relay
Control device .................................................. TH
Optional short cycle timer (3 min) .........180 s
Control relay .................................................... KA
Liquid Line Solenoid valve .........................LLSV
Compressor contactor .................................. KM
Phase monitor ................................................ PM
Safety lock out relay ........................................KS
Pump-down control low pressure switch ..LP
High pressure safety switch........................ HPs
Fused disconnect ............................................Q1
Fuses ...................................................................F1
Compressor motor ...........................................M
Discharge gas thermostat ......................... DGT
E ,
LECTRICAL DATA CONNECTIONS AND WIRING
CSR wiring provides additional motor torque at
start-up, by the use of a start capacitor in combi-
nation with the run capacitor. 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
and start duty as "soft serve ice cream machine"
can require CSR wiring. This configuration can also
be used to reduce erratic starting at unfavourable
conditions such as very low ambient temperature
or weak voltage.
Default solution: PSC wiring
with run capacitor only
PSC wiring
Run capacitor
μF
70
50
55
45
60
60
55
CONTROL CIRCUIT
FRCC.PC.016.A1.22
N
Thermostat
Additionnal components for CSR wiring
Start capacitor
Volt μF
370 145-175
370 161-193
440 88-108
370 145-175
370 88-108
370 161-193
440 88-108
F1 F1
KM KA KA
A1
KS
180 s
A2
TH
LP
KS
KM KA LLSV
Wiring diagram with pump-down cycle
L₁
Start Relay
5
2
Run capacitor
1
Start capacitor 15 kΩ -1 w
CSR wiring
Relay
Volt Reference
330 3ARR3J3AL4
250 3ARR3J24AP4
330 3ARR3J25AS4
250 3AAR3*3M*
330 3ARR3*3L*
250 3ARR3*3L*
250 3ARR3*25S*
L1 L3
KA KS
PM
T1
A3
HPs
DGT
KS
C
S R
RVA9CKL
RVA3EKL
RVA4GKL
L2
Q1
KM
T2
T3
M
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