4.1.7Heatquantitymeasurementoption
OHQM:Heat quantity
measurement
Adjustment range: OFF ... ON
Factory setting: OFF
Heat quantity measurement is possible if a flowmeter is
used. For this purpose, the heat quantity measurement
option (OHQM)has to be enabled.
The flow rate should be read from the flowmeter (l/min)
and has to be adjusted in the channel FMAX. Antifreeze
type and concentration of the heat transfer medium have
to be adjusted in the channels MEDT and MED%.
Antifreeze type:
0 : water
1 : propylene glycol
2 : ethylene glycol
3 : Tyfocor
®
LS / G-LS
FMAX:
Flow rate in l/min
Adjustment range 0 ... 20
in 0,1-steps
Factory setting: 6,0
kWh/MWh: Heat quantity
in kWh / MWh
Display channel
MEDT: Antifreeze type
Adjustment range: 0 ... 3
Factory setting: 1
MED%: Antifreeze concen-
tration (Vol-) %
When MEDT 0 or 3 is used,
the parameter MED% is
‚hidden‘.
Adjustment range: 20 ... 70
Factory setting: 45
The flow rate as well as the reference sensors S1 (flow) and
S4 (return) are used for calculating the heat quantity sup-
plied. It is shown in kWh in the channel kWh and in MWh
in the channel MWh. The overall heat quantity results from
the sum of both values.
The accumulated heat quantity can be reset. As soon as
one of the display channels of the heat quantity is selected,
the symbol
is permanently shown on the display. Press
button SET (3) for about 2 seconds in order to access the
RESET mode of the counter. The display symbol will
flash and the heat quantity value will be set to 0. In order to
finish this process, press the button to confirm.
In order to interrupt the RESET process, no button should
be pressed for about 5 seconds. The controller automatically
returns to the display mode.
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