King Electric SST 3 - Manual (Page 11)

Adjustable Electronic Thermostat TRACON
®
Model SST–3 (P/N 24492)
Instruction Manual
24494 Rev. - 04/12 (800) 234-4239 http: www.networketi.com Environmental Technology, Inc. 11 of 28
Refer to Figure 3 for useful information regarding the wiring connections on the
front panel PC board.
Figure 3. SST–3 FRONT PANEL PC BOARD TERMINALS.
An Alarm or power off condition can be communicated in either of two ways and
it is important to make the proper alarm relay connections to achieve the desired
result. The middle terminal labeled COM (Common) will always be used.
Connect one alarm relay lead to the COM terminal. Now, if, in your system, an
external alarm light or indicator will come on to communicate an alarm or power
off condition, connect the other alarm relay lead to the NC or Normally Closed
terminal. But, if, in your system, an external alarm light or indicator will go off to
signal an alarm or power off condition, connect the other alarm relay lead to the
NO or Normally Open terminal. Remember that when power is applied to the
unit, the Common and Normally Open contacts close to form a complete circuit.
If using a three-lead wire, it is not necessary to use all three leads when
connecting the alarm relay. Use the COM or Common terminal and either of the
other two terminals, as desired, based on the information in this paragraph.
Connect Alarm Relay
leads to these terminals.
Refer to the important
information below to
configure proper lead
connection based on
desired display mode. Connect Temperature
Probe leads to these
terminals. It does not
matter which lead goes
to which terminal.
Secure leads in place.