Grundfos TPE2 - 17 Description of Functions; Heat Energy Monitor; Setpoint; Operating Mode

17. Description of functions
17.1 Heat energy monitor
Pump variant Heat energy monitor
TPE3, TPE3 D ●
TPE2, TPE2 D -
The heat energy monitor is a monitoring function that
calculates the heat energy consumption within a
system. The built-in flow estimation needed for the
calculation has an inaccuracy of ± 10 % of the
maximum flow in the area down to 10 % flow and
down to 12.5 % of the maximum head. The
calculations are based on water at a temperature of
20 °C. Also, the temperature measurements needed
for the calculation have some inaccuracy depending
on the sensor type. Therefore, you cannot use the
heat energy value for billing purposes. However, the
value is perfect for optimisation purposes in order to
prevent excessive energy costs caused by system
imbalances.
The heat energy monitor requires an additional
temperature sensor installed in the flow pipe or return
pipe depending on where the pump is installed.
Use the analog inputs and/or Pt100/1000
inputs for measuring the temperatures
used for calculation by the heat energy
monitor.
The used inputs must not be set to Not
active and one of the measuring
parameters must be set to Temperature 2.
t
R
t
F
kWh
TM061182
Example: pump installed in the flow pipe and
additional temperature sensor installed in the return
pipe
Pos. Description
t
F
:
Flow-pipe temperature
t
R
:
Return-pipe temperature
17.2 Setpoint
Pump variant Setpoint
TPE3, TPE3 D ●
TPE2, TPE2 D ●
You can set the setpoint for all control modes, except
AUTOADAPT and FLOWADAPT, in this submenu
when you have selected the desired control mode.
See section Control mode.
Factory setting
See section Factory settings.
Related information
17.6 Control mode
35. Factory settings
17.3 Operating mode
Pump variant Operating mode
TPE3, TPE3 D ●
TPE2, TPE2 D ●
Possible operating modes:
• Normal
The pump runs according to the selected control
mode.
• Stop
The pump stops.
• Min.
Use the minimum-curve mode in periods in which
a minimum flow is required. This operating mode
is for instance suitable for manual night setback if
you do not want to use automatic night setback.
• Max.
Use the maximum-curve mode in periods in which
a maximum flow is required. This operating mode
is for instance suitable for systems with hot-water
priority.
• Manual
The pump is operating at a manually set speed. In
Manual the setpoint via bus is overruled. See
section Set manual speed.
• "User-defined speed"
The motor is operating at a speed set by the
user. See section "Set user-defined speed".
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