Emerson LW4 Instructions De Service page 3

O p e r a t i o n / P e r f o r m a n c e :
Low liquid level monitoring
LW4-L120
LW5-L120
Floater position at higher level of sight glass
Green LED is ON
Normal operation
Liquid level is too low (Not sufficient liquid in vessel)
Floater position at lower level of sight glass
Red LED is ON
NOT normal operation:
(Examples: Activation of
alarm/ open or close of a
valve/ stop or start of
operating a device)
Yellow LED is ON
Green and Red LEDs are
OFF
Note1: Please consider the fluctuation of liquid level during of system operation and off cycles (migration of liquid from or into vessel). It is recommended the
switching of relay to be disconnected during OFF cycles by other means in order to prevent any false signal due to migration of liquid from or into vessel.
Note2: LW4X-... and LW5X-... are calibrated differently to LW4-... and LW5-...and intended to be used with very narrow (1/2", 12 mm) connection to vessel.
Emerson Climate Technologies GmbH
Am Borsigturm 31 I 13507 Berlin I Germany
Liquid Level Monitoring Systems LW4/LW5 Low or High Level
LW4X-L120
LW5X-L120
Liquid level at desired level
Relay: BK-BU close
Relay: BK-BN open
Relay: BK-BU open
Relay: BK-BN close
Yellow LED has no real function and shall be ignored at all times
No power supply
Relay: BK-BU close
Relay: BK-BN open
www.emersonclimate.eu
Operating instruction
Control
High Liquid level monitoring
LW4-H120 LW4X-H120
LW5-H120 LW5X-H120
Liquid level at desired level
Floater position at lower level of sight glass
Liquid level too high (Excessive liquid in vessel)
Floater position at higher level of sight glass
Date: 25.07.2019
T e c h n i c a l d a t a :
LW4
Max. working pressure PS: LW4: 60 bar
Test pressure PT: LW4: 66 bar
HFCs, HFO blends,
Medium compatibility
Oil and CO (60 bar)
2
Liquid oil density 700...1300 Kg/m
Supply voltage 24 VAC ±10%, 50/60 Hz
Current: 0.05 A
3A/230 VAC
Relay contact
SPDT (NO and NC)
Time delay before relay
120 seconds
activation:
Protection class
IP65
(IEC529/EN60529):
Storage, transport and
-20...+50°C
ambient temperature
Oil: -20... +80°C
Refrigerant:
R32: -20...+65°C
R404a: -20...+65°C
Medium temperature by
R407C: -15...+80°C
considering the density of
R410A: -20...+65°C
liquid medium:
R449A: -20...+75°C
R507: -20...+65°C
R1234ze: -20...+80°C
R744: -20...+25°C
LW4: 60 bar/ LW5: 130 bar (liquid phase)
Marking:
acc. EMC and Low Voltage Directive,
LW45_OI_ML_R05_865912.docx
LW5
LW5: 130 bar
LW5: 143 bar
Oil and CO
2
(130 bar)
3
R134a: 0...+80°C
R407A: -10...+80°C
R407F: -20...+75°C
R448A: -20...+75°C
R450A: -10...+80°C
R513A: 0...+80°C