Siemens 125-1957 - Manual (Page 41)

Siemens Building Technologies, Inc. 31
4
Troubleshooting
Overview
This chapter describes corrective measures you can take should you encounter a problem
when using a Unit Vent Controller.
You are not required to do any controller troubleshooting. You may want to contact your local
Siemens Building Technologies representative if a problem occurs or you have any questions
about the controller.
NOTE: When troubleshooting, record what the problem is and what actions were
performed immediately before the problem occurred. Being able to describe the
problem in detail is important, should you need assistance from your local
Siemens Building Technologies representative.
Basic Service Information
Always remove power to the controller when installing or replacing it. Since the controller
does not have a power switch, the recommended method of removing power to a locally
powered controller is to turn OFF the power to the 24 Vac transformer. The recommended
method of removing power to a controller on a power cable (even to service a single
controller) is to turn OFF the power at the transformer.
NOTE: When removing power to a controller to perform maintenance or service, make
sure that the person in charge of the facility is aware of this and that appropriate
steps are taken to keep the building in control.
Never remove the cover from the controller. There are no serviceable parts inside. If a
problem is found with a controller, contact your local Siemens Building Technologies
representative for replacement. An anti-static wrist strap is recommended when installing or
replacing controllers.