Resol DeltaSol AL EHE, Manual, Page: 27 / 40

27
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Heat quantity measurement
The heat quantity measurement can be carried out in 3 different ways (see below):
with a fixed flow rate value, with a VFD Grundfos Direct Sensor™ or with a PWM
feedback signal.
Heat quantity measurement with fixed flow rate value
The heat quantity balancing (estimation) uses the difference between the collector
and the store base temperatures and the entered flow rate (at 100 % pump speed).
Î Read the flow rate (l/min) and adjust it in the FMAX channel.
Î Adjust the antifreeze type and concentration of the heat transfer fluid in the
channels MEDT and MED%.
FMAX
Flow rate in l/min
Adjustment range: 0.5 … 100.0
Factory setting: 6.0
Note:
The FMAX channel will be available only if the SEN channel has been set
to OFF or if no VFD Grundfos Direct Sensor™ is activated.
Heat quantity measurement with a VFD Grundfos Direct Sensor™
In order to use a VFD Grundfos Direct Sensor™ for heat quantity measurement,
proceed as follows:
Î Register the VFD Grundfos Direct Sensor™ in the GFD channel.
Î Adjust the position of the VFD Grundfos Direct Sensor™ in the SEN channel.
Î Adjust the antifreeze type and concentration of the heat transfer fluid in the
channels MEDT and MED%.
Heat quantity measurement with a PWM feedback signal
In order to use a VFD Grundfos Direct Sensor™ for heat quantity measurement,
proceed as follows:
Î Register the PWM feedback signal of a bidirectional HE pump on the PFB
channel.
Î
Adjust the antifreeze type and concentration of the heat transfer fluid in the
channels MEDT and MED%.
The VFD Grundfos Direct Sensor™ can optionally be used for measuring the tem-
perature:
Î Register the VFD Grundfos Direct Sensor™ in the GFD channel.
Î Adjust the position of the VFD Grundfos Direct Sensor™ in the SEN channel.
Note
if a VFD Grundfos Direct Sensor™ is optionally activated, it will not be
used for measuring the flow rate but for measuring the flow and return
temperature respectively.
Note
If the PWM feedback signal sends an error message, heat quantity meas-
urement will not be carried out.
SEN
Digital flow rate sensor (only if GDF = 12, 40 or 40 F)
Selection: OFF, 1, 2
Factory setting: 2
Flow rate detection type:
OFF : PWM feedback signal or fixed flow rate value (flowmeter)
1
: PWM feedback signal or Grundfos Direct Sensor™ in the flow pipe
2 : PWM feedback signal or Grundfos Direct Sensor™ in the return pipe
Sensor allocation for heat quantity measurement:
1 2 OFF
SFL SRET SFL SRET SFL SRET
GFD S4 S1 GFD S1 S2