WTR Series
Installation Instructions
L120 Installation & Maintenance Manual 120-11000 A
Stem Acceptance
The maximum stem acceptance is provided in Table 3.
Table 3 – Stem Acceptance
Maximum stem acceptance
Drive 2 Drive 1 Drive 1
Tapped Bore Key
Unit size inch mm inch mm inch mm
L120-10 1.25 32 1.00 25 1/4x3/32 8x6
L120-20 2.25 57 1.875 47 1/2x3/16 14x9
L120-40 2.625 66 2.125 52 1/2x3/16 16x10
Torque Switch
The torque switch is designed to protect the actuator in open and close directions.
CAUTION: Disconnect all incoming power before opening limit switch compartment
or working on the torque switch.
• Do not use abrasive cloth to clean the contacts on the torque switch.
• Do not torque seat 90° operation valves nor run them against the stops. This may
cause damage to the valve.
NOTE: If the actuator has "torqued out," release torque buildup by operating the unit
manually.
Setting Torque Switch
The torque switch was set at the factory according to customer-supplied information
regarding necessary torque or thrust output that was provided at the time of the order.
However, if the torque switch needs to be installed or the setting needs to be adjusted follow
the procedure below:
CAUTION: A maximum stop setting plate is provided on most units. Do not remove
this plate. Do not exceed the setting indicated by this plate without contacting
Limitorque.
• Installing or adjusting the torque switch with the operator on a loaded condition will
result in a loss of torque protection.
Item letters correspond to Figure 2.
1. Place the L120 actuator in manual mode.
2. Release the load on the wormshaft spring pack.
3. For open and close directions, loosen Screw (A) and move Pointer (B) to desired position.
A higher number indicates a high torque and/or thrust output.
4. Tighten Screw (A).
5. Operate the valve electrically to seat valve and to ensure tight shut-off.
6. Re-balance torque switch if required. (see page 6)
5
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