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5 – 6
Not used
7 – 8
Hot Water
Temperature
Sensor
When a Calorifier is connected, a hot water sensor or an on/off thermostat can be
connected. If a sensor is connected, the domestic hot water is set at 60 in the Boiler
and also the water temperature will be shown on the display when active on DHW.
9–10 Not
used
temperat
ure control
with clock for
secondary
circuit
11-12 0 – 10 VDC
The boiler can be controlled by external control, through a 0 to 10 V signal, by
which 0 Volt is no heat demand and 10 V is maximum output. The DC supply “+”
has to be connected to terminal 11, while the “-“ has to be connected to terminal 12.
A Flow Temperature sensor is also required available at extra cost from Strebel
13-14 Room
temperature
control (with
or without
timer) for the
heating
circuit
These terminals have the following possibilities:
1.
When
no
on /off control is connected, the boiler temperature is controlled
by the maximum flow temperature, (set by the CH Control Knob on the
Panel). In this case a link has to be used between 13 and 14 .When an
outside temperature sensor is connected, the boiler is controlled through the
heating curve, which can be shifted with the CH Control knob on the Panel.
2.
When an On/Off Control (with or without a timer) is connected, this
control switches the boiler Off, when the desired temperature reaches the
temperature set on such control. (with or without outside temperature
compensation).
15-16 Cascade
connection
When two or more boilers are connected to the boiler control (every boiler control
has a built in cascade manager) each boiler of the cascade has to be connected to the
next boiler, using a two wire bus (cascade connection) terminals.
A Flow
Temperature sensor is also required available at extra cost from Strebel.
NOTE : The cascade control must be used on multiple Boiler systems sharing the same flue.
