en
63
11 HQM
In the HQM menu, up to seven internal heat quantity measurements can be acti-
vated and adjusted.
By selecting the menu item New HQM..., a new heat quantity measurement can
be activated.
A menu opens in which all adjustments required for the heat quantity measure-
ment can be made.
If the Flow rate sensor option is activated, the impulse input or, if available, a
Grundfos Direct Sensor™ can be selected. Grundfos Direct Sensors™ are only
available if they have been previously registered in the In-/Outputs menu. The im-
pulse rate must be adjusted in that menu as well.
If the Flow rate sensor option is deactivated, the controller calculates the heat
quantity by means of a fi xed fl ow rate value.This is called heat quantity balancing.
For this purpose, the fl ow rate must be read from the fl owmeter at 100 % pump
speed and adjusted in the adjustment channel Flow rate. In addition to that, a Re-
lay must be allocated. Heat quantity balancing is in effect whenever the allocated
relay is active.
In the adjustment channel Fluid type , the heat transfer fl uid must be selected.
If either Propylene glycol or Ethylene glycol is selected, the adjustment channel
Ratio is indicated in which the antifreeze ratio of the heat transfer fl uid can be
adjusted.
When the Alternative unit option is activated, the controller will convert the
heat quantity into the quantity of fossil fuels (coal, oil or gas) saved, or the CO
2
emission saved respectively. The alternative unit can be selected. A conversion
factor must be adjusted for the calculation. The conversion factor depends on the
arrangement in use and has to be determined individually.
Heat quantity measurements already activated will appear in the HQM menu above
the menu item New HQM in numerical order.
If an activated heat quantity measurement is selected, the above mentioned menu
with all adjustment values will re-open.
To deactivate a heat quantity measurement, select the menu item Delete func-
tion at the bottom of the menu.
The heat quantity measurement deleted will disappear from the list and become
available for selection in the New HQM menu again. The numeration of the other
activated heat quantity measurements will not change.
Summary of Contents for SC5.14
Page 78: ...en 78 ...
Page 79: ...en 79 ...