External On/Off - A.O. Smith DRE PLUS Installation, User And Service Manual

8.5.4
c
0313853_DRE PLUS_ENNLFR_V3.0, 20-06-2023
To use the alarm output:
1. Connect a power supply (250V/10A max.) to one of the supply terminals (11 or 21).
2. Connect the output terminal (NC: 12 or 22 and NO: 14 or 24) to your external
device.

External ON/OFF

The External ON/OFF contacts can be used to control the heater.
X2 X3
Mode
On
Off
Economy
Week program
The heater is supplied with two shunts on X2 and X3. You can remove the shunts to
permanently set the heater to one mode. You can also replace the shunt with an external
switch or relay so you can open/close the contact remotely.
Caution
Do not apply power to these terminals.
Setpoint
Normal
-
Economy (Normal setpoint minus
the Economy setpoint adjust-
ment)
Switches between Normal and
Economy according to program
External contacts
X2 = Closed
X3 = Closed
X2 = Open
X3 = Open
X2 = Closed
X3 = Open
X2 = Open
X3 = Closed
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EN