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J20741 - Subject to change. © Belimo Aircontrols (USA), Inc.

LF

LF120 (-S) US / LF230 (-S) US 

On-off, Spring Return Fail-Safe, 120/230 VAC

Accessories
AV 10-18

Shaft extension (K6-1 is required)

IND-LF

Damper position indicator

K6-1

Universal clamp for up to 3/4” diameter shafts

KH-LF

Crankarm for up to 1/2” round shaft 

Tool-06

8mm and 10 mm wrench

ZG-LF2

Crankarm adaptor kit for LF 

ZG-112

Mounting bracket for Honeywell Mod IV, M6415 
type actuators, and new installations

ZG-LF112 Crankarm adaptor kit for Honeywell Mod IV, 

M6415 type actuators, and new installations 

ZS-100 

Weather shield (metal)

ZS-150

Weather shield (polycarbonate)

ZS-260

Explosion-proof housing

Note:  When using LF120/230 US and LF120-S/230-S US

actuators, only use accessories listed on this page. 

For Actuator Wiring Information and Diagrams,  
Please See Belimo Wiring Guide (pg 349).

LF120 (-S) US /  LF230 (-S) US Typical Specification
On-off spring return damper actuators shall be direct coupled
type which require no crankarm and linkage and be capable of
direct mounting to a shaft up to a 3/4” diameter and center a
1/2” shaft. The actuators must be designed so that they may be
used for either clockwise or counterclockwise fail-safe opera-
tion.  Actuators shall be protected from overload at all angles
of rotation. If required, 1 SPDT auxiliary switch shall be provid-
ed having the capability of being adjustable.  Actuators must be
constructed to meet the requirements for Double Insulation so
an electrical ground is not required to meet agency listings.
Actuators shall be UL listed and CSA certified, have a 5 year
warranty, and be manufactured under ISO 9001 International
Quality Control Standards.  Actuators shall be as manufac-
tured by Belimo.           

Wiring Diagrams

2

1

Provide overload protection and disconnect as required.

Actuators may be connected in parallel.  Power con-
sumption must be observed.

No ground connection is required.

2

3

1

3

Provide overload protection and disconnect as required.

Actuators may be connected in parallel. Power con-
sumption must be observed.

No ground connection is required.

For end position indication, interlock control, fan start-
up, etc., LF120-S US and  LF230-S US incorporate
one built-in auxiliary switch:  1 x SPDT, 3A (0.5A)
@250 VAC, UL listed, adjustable 0° to 95°.

Meets UL and CSA requirements without the need of an
electrical ground connection.

®

4

5

On-off wiring for LF120 US / LF230 US

On-off wiring for LF120-S US / LF230-S US

1  Neutral

2  Hot

1

2

120 VAC 

230 VAC 

LF120 US 
LF230 US

3

L1  N

L2  H

1  Neutral

2  Hot

2

3

4

5

5

S1

S2

S3

NC

NO

0

°

 to 95

°

LF120-S US 
LF230-S US

1

120 VAC 
230 VAC

L1  N

L2  H

W049

W050

Summary of Contents for LF120 US

Page 1: ...s adjustable between 0 and 95 Dimensions All numbers in brackets are in millimeters LF120 S US LF230 S US On off Spring Return Fail Safe 120 230 VAC Technical Data LF120 S US LF230 S US Power supply 120 VAC 10 230 VAC 10 50 60 Hz 50 60 Hz Power consumption running 5 5 W 5 W holding 3 5 W 3 W Transformer sizing 7 5 VA 7 VA Electrical connection 3 ft 18 GA appliance cable S models have 2 cables 1 2 ...

Page 2: ... tion Actuators shall be protected from overload at all angles of rotation If required 1 SPDT auxiliary switch shall be provid ed having the capability of being adjustable Actuators must be constructed to meet the requirements for Double Insulation so an electrical ground is not required to meet agency listings Actuators shall be UL listed and CSA certified have a 5 year warranty and be manufactur...

Page 3: ...6 1 is required Installation Instructions Quick Mount Visual Instructions min 3 1 2 90 min 3 1 2 90 min 3 4 20 IND LF Position Indicator optional min 3 4 20 IND LF Position Indicator optional 1 Rotate the damper to its failsafe position If the shaft rotates counterclockwise mount the CCW side of the actuator out If it rotates clockwise mount the actuator with the CW side out 2 If the universal cla...

Page 4: ...he universal clamp finger tight only 7 Mount the anti rotation strap at the base of the actuator Do not tighten the screws 8 Remove the screw from one end of the mounting bracket and pivot it away from the actuator 9 Loosen the universal clamp and making sure not to move the damper shaft rotate the actuator approximately 5 in the direction which would open the damper 10 Tighten the universal clamp...

Page 5: ... seconds During this time you will see no response at the actuator The microprocessor will retain the initialized zero during short power failures of up to 25 seconds When power is applied during this period the actuator will return to normal operation and proceed to the position corresponding to the input signal provided For power failures over 25 seconds the actuator will be at it fail safe posi...

Page 6: ...ows an increasing or decreasing control signal with a 80 mV resolution If the signal changes in the opposite direction the actuator will not respond until the control signal changes by 200 mV This allows these actuators to track even the slightest deviation very accurately yet allowing the actuator to wait for a much larger change in control signal due to control signal instability Control Accurac...

Page 7: ...es the switch indicator moves from 6 60 toward 0 0 When the indicator passes 0 the switch contact between S1 and S2 is broken and the con tact between S1 and S3 is made Auxiliary Switches 8 6 4 2 0 1 S1 S2 S3 S1 S2 S3 Non direct Mounting Methods KH LF crankarm including retaining ring KH LF For shafts up to 1 2 ZG 112 pushrod not supplied with kit KG6 ball joint and universal crankarm not included...

Page 8: ...ed by the same control signal may be powered from multiple transformers provided the following rules are followed 1 The transformers are properly sized 2 All No 1 wires from all actuators are tied together and tied to the negative leg of the control signal See wiring diagram Wire Length for LF Actuators Keep power wire runs below the lengths listed in the table in Fig A If more than one actuator i...

Page 9: ...ate Damper will go from fully closed to fully open Torque requirement is actua tor s minimum torque Gives Expected Response Go To Step Actuator operates properly Step 8 Power wiring correct ed actuator begins to drive Step 1 Actuator operates properly Step 8 Actuator operates properly Step 8 Controller output actuator input is correct Input Polarity Correct Step 6 Damper moves properly Step 7 Defe...

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