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20
Installation Indications, functions and options MessagesCommissioningOperation and function
Note
Since this function uses the limited heat quantity of the store, the anti-
freeze function should only be used in regions with few days of tempera-
tures around the freezing point.
The antifreeze function will be suppressed if the store temperature falls
below +5 °C [+40 °F] in order to protect the store from frost damage.
Grundfos Direct Sensor™ registration
GFD
Grundfos Direct Sensor™ registration
Selection: OFF, 12, 40, 40F
Factory setting: OFF
Registration of a digital ow rate sensor which can be used for heat quantity meas-
urement.
OFF : no Grundfos Direct Sensor™
12 : VFD 1 - 12 (water / propylene glycol mixture)
40 : VFD 2 - 40
40F : VFD 2 - 40 Fast (water only)
Heat quantity measurement
OHQM
Heat quantity measurement option
Adjustment range: OFF / ON
Factory setting: OFF
If OHQM is activated, the heat quantity gained can be calculated and displayed.
The heat quantity measurement can be carried out in 2 different ways (see below):
with a xed ow rate value or with a VFD Grundfos Direct Sensor™.
Heat quantity measurement with xed ow rate value
The heat quantity balancing (estimation) uses the difference between the ow and
return temperatures and the entered ow rate (at 100 % pump speed).
Î Read the ow rate (l/min) and adjust it in the FMAX channel.
Î Adjust the antifreeze type and concentration of the heat transfer uid 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™
Heat quantity measurement with a VFD Grundfos Direct Sensor™ is possible in
all system layouts.
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 type and concentration of the heat transfer uid in the channels
MEDT and MED%.
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General