Flow/Return Temperature Display; Flow Rate Display; Current Pump Speed Display; Operating Hours Counter - Thermal Energy - Riello SUN 1 PLUS 2 RS Installation Instructions Manual

18.5 Flow/return temperature display

TR, TFL: Other temperatures
Display range: -40 ... +260 °C
Shows the current temperature measured by the corresponding
sensor.
TR collector return temperature
TFL collector flow temperature

18.6 Flow rate display

L/h: Flow-rate
Setting range: according to the type of sensor used
Shows the flow rate measured by the VFD sensor.

18.7 Current pump speed display

n %: Current pump speed
Display range: 30 ... 100 %
Current pump speed display.

18.8 Operating hours counter - thermal energy

h P, h P1, h P2: Operating hours counter
View-only parameter
The operating hour counter sums the hours of operation of each
component controlled by the corresponding relay (h P , h P1, h
P2). The display only shows complete hours.
Operating hour counts can be zeroed by selecting the parameter
for the counter in question. Press and hold button 3 for a few
seconds until the SET message starts to flash and the count is
reset to zero. Press button 3 again to confirm.
To cancel the reset, press button 3 for 5 seconds. The controller
switches to initial display mode.
kWh/MWh: Thermal energy in kWh / MWh
Displays the thermal energy produced – only available if the
thermal energy metering function (OHQM) is activated. Thermal
energy metering can be implemented in two ways: with a fixed
flow rate or with a Grundfos Direct Sensor™ VFD. Measured ther-
mal energy is displayed in kWh in parameter kWh and in MWh
(kWh x 1000) in parameter MWh.
The sum of the two displayed values represents the total amount
of thermal energy produced.
RESETTING THE THERMAL ENERGY METER
The thermal energy count can be reset to zero. Proceed as fol-
lows.
Select one of the two parameters. The SET message appears
fixed. Press and hold button 3 (SET/OK) for 2 seconds to enter
reset mode. The SET message flashes and the value is reset to
zero. Press button 3 again to confirm the operation.
To cancel the reset, press button 3 for 5 seconds. The controller
automatically switches to its initial display mode.
16