Bulex Thema Condens AS 48-A, Manual, Page: 84 / 199

MAKSİCONDENSE 48-65
Notes
01/2018 78 Training 0020260859_00
3.3.5.4 New! Calculating the remaining pump head (constant value)
The remaining feed head of the high-efficiency pump is calculated by the electronics for the set
remaining feed head
(D.122 remaining feed head heating mode; D.148 remaining feed head
cylinder charging mode) as a constant value for the pump. Pressure losses during installation do
not play a role. The focus is on the calculated remaining feed head from the project planning stage.
In order to use the function, parameter
D.014 = 0 is required (0 = pump speed control relative to the
constant remaining pump head)
Note:
New! For the Space heater unit, there are now two separate setting parameters for
the unit pump's remaining feed head in different operating modes.
D.122 = remaining feed head in heating mode
D.148 = remaining feed head in cylinder charging mode
Via the PWM response, the electronics calculate and adapt the PWM signal for the high-efficiency
pump, using the stored, pre-set remaining pump head and the actual volume flow. This ensures a
constant control of the pump and the minimum circulation water volume.
Stored calculation formula:
Remaining pump head = a x PWM
2
+b x c x volume flow
2
+ d x volume flow + e
Constant remaining feed head of the high-efficiency pump
Remaining feed head check for 48 kW boilers
Volume flow rate [l/min]
400 mbar
300 mbar
200 mbar
100 mbar
Rema
in
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g fee
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