User manual

Page 26
Description of Controls Connections
1-2 OUTDOOR SENSOR
When an outside temperature sensor is connected, the boiler will control the flow water temperature
by using a calculated setting, which is relative to the outside temperature. PARAMETER :
No parameter settings needed.
3-4 SYSTEM FLOW TEMPERATURE SENSOR
When a low loss header is used, this flow sensor measures the flow temperature at the system side.
The sensor (if used) must be mounted on the supply pipe at the system side, just after the low loss
header. REMINDER: The sensor must be used when several boilers are cascaded with the internal
cascade manager.
There are no PARAMETER: settings needed.
5-6 CALORIFIER SENSOR or THERMOSTAT
When an indirect hot water tank / calorifier is installed and controlled by the Boiler a hot water sensor
must be connected to these terminals. In case of a DHW heat demand, the set point will be shown in
the display. An external on/off thermostat can also be connected to these terminals. When there is
heat demand (terminal 5 and 6 are bridged/made) the flow temperature going to the primary hws coil
(s) will be shown in the display.
7-8 GENERAL BLOCKING
A heat demand that will start the burner will be blocked when terminals 7 and 8 are not bridged/made.
This connection is for the use of external safety devices The Terminals must be bridged/made for
allowing the burner to fire.
Extensive Information relating to the control and parameters is available in the Electrical
Control Commission Manual