Viessmann SCU224 User Manual page 44

SCU224
Evacuated tube collector function
O TC:
Evacuated tube collector
function
Adjustment range: OFF / ON
Factory setting: OFF
TCST:
Tube collector function
starting time
Adjustment range:
00:00 ... 23:45
in steps of 00:15
Factory setting: 07:00
TCEN:
Tube collector function
ending time
Adjustment range:
00:00 ... 23:45
in steps of 00:15
Factory setting: 19:00
TCRU:
Tube collector function
runtime
Adjustment range: 5 ... 500 s
in steps of 5 s
Factory setting: 30 s
TCIN:
Tube collector function
standstill interval
Adjustment range: 1 ... 60 min
in steps of 1 min
Factory setting: 30 min
Energy metering
OHQM: Energy metering
Adjustment range: OFF / ON
Factory setting: OFF
FMAX: Flow rate in l/min
Adjustment range: 0.5 ... 100.0
in steps of 0.5
Factory setting: 6.0
MEDT: Heat transfer fluid
Adjustment range: 0 ... 3
Factory setting: 1
MED%: Antifreeze ratio
in Vol-% (MED% is hidden
when MEDT 0 or 3 is used.)
Adjustment range: 20 ... 70
in steps of 1 %
Factory setting: 45
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This function helps overcome the disadvantages caused by
the non-ideal sensor position with some tube collectors.
This function is not required with the Vitosol 300-T, but is
required for the Vitosol 200-T.
This function operates within an adjusted time frame (be-
ginning at TCST and ending at TCEN). It activates the
collector circuit pump for an adjustable runtime (TCRU)
between adjustable standstill intervals (TCIN) in order to
compensate for the delayed temperature measurement.
If the runtime TCRU is set to more than ten seconds, the
pump will be run at 100 % for the first ten seconds of the
runtime. For the remaining runtime, the pump will be run
at the adjusted minimum speed nMN.
If the collector sensor is defective or the collector is blocked,
this function is suppressed or switched off.
In system layout 7 (Arr = 7) both collectors are operated
independently from each other by means of this function. If
the tank is being loaded by one collector, the other one is
nevertheless operated after the adjusted standstill time.
Note:
If the drainback option ODB is activated, TCRU
will not be available. In that case, the runtime
is determined by the parameters tFLL and
tSTB.
If OHQM is activated, the heat quantity gained can be calcu-
lated and displayed. Energy metering is possible on Arr. 1, 3,
4, 5 and 10 if a flowmeter is used. To enable energy metering,
proceed as follows:
Î Read the flow rate (l/min) from the flowmeter at maxi-
mum pump speed and adjust it in the FMAX channel
Î Adjust the heat transfer fluid and the concentration of
the antifreeze in the channels MEDT and MED%.
Note:
When using Tyfocor HTL set MEDT to 1 and
MED% to 50.
Heat transfer fluid:
0 : Water
1 : Propylene glycol
2 : Ethylene glycol
3 : Tyfocor LS / G-LS
®
Note:
If the system layout 10 has been selected and
OHQM is activated, energy metering will be
interrupted when the 3-way-valve switches to
the heat dump.