tekmar 481 User Switch Installation - Manual (Page 8)

© 2009 D 481 - 07/09 8 of 12
Critical and Non-Critical Alert Levels
DIP switch 1 = ON
DIP switch 2 = OFF
DIP switch 3 = Permanent or Momentary
Relay contact 1 closes while a non-critical error message is present on the tN4
system. A non-critical error allows the heating system to continue to operate.
Relay contact 2 closes while a critical error message is present on the tN4 system.
The critical errors are:
1) Adjust EEPROM error on any device.
2 Boiler supply sensor open or short circuit.
3) Mix supply sensor open or short circuit.
4) A thermostat has no air or floor temperature sensor reading.
Relay contact 3 is not used.
Application Example:
The relay contacts can connect to a third party paging device that, when activated,
pages a service technician when a critical error message is present.
Button Operation
DIP switch 1 = OFF
DIP switch 2 = ON
DIP switch 3 = Permanent or Momentary
Each relay contact is synchronized with the corresponding User Button. When a
button is pressed or the scene is changed to the User Button’s programmed scene,
the relay contact closes.
Application Examples:
The relay contacts can connect to a third party automation system to indicate that
one of the User Buttons has been activated.
The User Button can be programmed to the “disabled” button operation. When the
User Button is pressed, the light turns green and the corresponding output relay
contact can activate lighting, security cameras, alarms or power a melt demand
on a non-tN4 snow melt control (664, 665, 667) to manually start snow melting.
Scene Signal
DIP switch 1 = ON
DIP switch 2 = ON
DIP switch 3 = Permanent or Momentary
The relay contacts operate in combinations in order to communicate the current tN4
scene to third party devices. The contacts operate according to the following table:
ON OFF
ON OFF
ON OFF