Coopra Advanced Heating Technologies Installation manual E40C
14
1.11. Circulation pumps
1.11.1. Boiler pump
If set in the menu on automatic function (parametermenu
setting) the electronics switches the speed of the pump
to “high” or “low”, depending on the temperature demand:
• Dt > 30 °C : the pump runs „high speed“.
• Dt < 10 °C : the pump runs „low speed“.
Dt = Setpoint temperature deducted with the actual Flow
temperature.
0 0,2
0
0,2
0,3
0,6
Flow [m³/h)]
Pressure [bar]
0,7
0,5
0,4
0,1
0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0
Pump state high
Pump state low
Boiler resistance
2,2 2,4 2,82,6 3,0
0,8
Characteristic and the resistance graph of boiler pump.
1.11.2. Secondary system pump
If the capacity of the unit pumps is insufficient, an extra
external system pump can be installed with the
appliance.
You must connect the
secondary system
pump to ports 1, 2,
and 3 of the connector
block, mounted on the
electronics casing.
The absorbed current consumption of the secondary
system pump may be maximum 275 W (1,2 Amp).
On command of the printed circuit board, an external
second system-pump will switch with the internal boiler-
pump simultaneously. Note the internal pump will switch
high/low/off (2-stage) while the external pump will switch
on/off (1-stage).
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