Installation Instructions

Document No. 550-163
Installation Instructions
June 18, 2015
Siemens Industry, Inc. 7 of 11
Wiring Instructions
1. Connect the FLN.
FLN Wiring.
2. Connect the power trunk. DO NOT apply power
to the controller without first consulting the specialist.
This ATEC is designed to work with 2-wire AC power
(Neutral and Phase (hot) at 24 Vac +/-20%. Use of
the earth terminal is optional and if used it should be
connected to the nearest earth ground (building
steel, conduit or duct work (if earthed)).) The
optional earth ground is connected near where the
ATEC is mounted.
Power Wiring.
Digital Outputs
The digital outputs on the ATEC are Triac type
outputs. 24 Vac must be applied to the “C” pin of the
DO connector, the side view of the actuator shows
output pin details. By providing Triac DOs, the
application can switch either 24 Vac or Neutral
depending on application needs. In a 24 Vac circuit,
neutral is determined by which side of the
transformer is earth grounded. If neither side is earth
grounded (at the transformer) then the 24 Vac is
considered a floating (isolated source).
CAUTION
It is important that the neutral
that supplies the TEC must be
earth grounded at the source
of the 24 Vac power.
Possible erratic equipment
operation or damage if neutral
is not grounded.
ATEC with Electric Heat and Fan.