TECH ST-402N PWM, User Manual, Page: 2 / 32

ST-402N User's Manual v 1.0.3
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I. Safety
Before using the device for the first time the user should read the following regulations carefully. Not
obeying the rules included in this manual may lead to personal injuries and device damage. The user's
manual should be stored in a safe place for further reference.
In order to avoid accidents and errors it should be ensured that every person using has familiarized
themselves with the principle of operation and security functions of the device. If the device is to be
sold or put in a different place, make sure that the user's manual is kept with the device so that any
potential user has access to essential information about the device. The manufacturer does not accept
responsibility for any injuries or damage resulting from negligence; therefore, users are obliged to take
the necessary safety measures listed in this manual to protect their lives and property.
WARNING
 High voltage. Make sure the regulator is disconnected from the mains before perform-
ing any activities involving the power supply (plugging cables, installing the device
etc.).
 The device should be installed by a qualified electrician.
 Before starting the controller, the user should measure the earthing resistance of the
electric motors as well as the insulation resistance of the cables.
 The regulator should not be operated by children.
NOTE
 The controller may be damaged if struck by lightning. Make sure the plug is discon-
nected from the power supply during storms.
 Any use other than that specified by the manufacturer is forbidden.
 Before and during the heating season, the controller should be checked for the condition
of its cables. The user should also check if the controller is properly mounted and clean
it if dusty or dirty.
After the editing of this manual was completed on June 29, 2015, changes in products specified in the
manual may have taken place. The manufacturer reserves the right to change the information in
regards to products. The illustrations may contain additional equipment. The printing technology may
affect differences in shown colours.