Installation Instructions

Document No. 546-00092
Installation Instructions
August 10, 2011
Page 3 of 6 Siemens Industry, Inc.
8. To change to an opposite full open/closed
position with actuator retracted, loosen the crank
arm bolt from the damper shaft. Reposition the
damper to the full closed or open position, and
tighten the crank arm bolt using the open-end
wrench. Verify that the crank arm bolt is firmly
tightened to prevent slippage of the damper
shaft.
NOTE:
The linkage is designed for 1/2-inch to 3/4-
inch shafts. Use a shaft bushing adapter for
smaller sized shafts.
9. To change to an opposite full open/closed
position with actuator retracted, loosen the crank
arm bolt from the damper shaft. Reposition the
damper to the full closed or open position, and
tighten the crank arm bolt using the open-end
wrench. Verify that the crank arm bolt is firmly
tightened to prevent slippage of the damper
shaft.
NOTE:
The linkage is designed for 1/2-inch to 3/4-
inch shafts. Use a shaft bushing adapter for
smaller sized shafts.
Section 2 – Power Trunk Wiring
The LRC, FHC, and LEA are powered with 24 Vac
provided by a Class 2-power source.
1. Connect the ‘E’ terminal of the LEA Interface
board to earth ground. Grounding the
common/neutral of the power trunk is not
recommended for the LEA Interface board.
2. Connect a certified 24 Vac Class II power
source to the LEA Interface Board, TB J1, using
18 AWG or larger wires (Figure 5).
3. Venturi Air Valves and Terminal Boxes (blade
dampers), all sizes draw 25 VA maximum per
LEA Interface board.
NOTE:
DO NOT tie the common/neutral of
separate power trunk transformers
together, as this creates one large power
trunk and may combine devices that create
failures.
NOTE:
When connected to the MMI/RTS port of an
LRC or FHC through a laptop’s COM port,
DO NOT use a three-wire plug power
supply for your laptop. Power the laptop by
battery only, or use a three-wire to two-wire
ground-isolating adaptor plug when
plugging the laptop into an outlet. The third
wire of the plug can cause a ground loop
with certain device combinations that may
damage the LEA Interface board.
NOTE:
The ‘E’ terminal of connector J1 must be
connected to earth ground.
Actuator Wiring
The Lab Electronic Actuator is provided with a 24"
cable with pre-wired connector that attaches to the
Interface Board at the J5 terminal (a 5-pin
connector).
Section 3– Floating Control
(Digital) Applications
This section covers installation for FHET, lab supply
air terminal, lab exhaust air terminal, FHC, LRC, and
floating control signals from any controller.
1. Connect the three wires from the controller, to
J2 using 20 AWG wires (Figure 5).
Figure 5. Floating Controller (Digital) and LEA
Interface Board Wiring.
2. Set the switches (Figure 8) using Table 1 and
Table 2.