Viessmann SCU 123 Manual page 15

SCU 123
Energy metering
OHQM:
Energy metering
Adjustment range: OFF / ON
Factory setting: OFF
FMAX:
Flow rate in gal/min
Adjustment range:
0.0 ... 5.0 gal/min
in steps of 0.2 gal/min
Factory setting: 1.6 gal/min
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
Operating mode
MAN1:
Operating mode R1
Adjustment range:
ON / Auto / OFF / n1LO
Factory setting: Auto
MAN2:
Operating mode R2
Adjustment range:
ON / Auto / OFF / n2LO
Factory setting: Auto
Temperature unit
UNIT:
Temperature unit
Selection: °F, °C
Factory setting: °F
Reset
RESE:
If OHQM is activated, the heat quantity gained can be calcu-
lated and displayed. Energy metering is possible if a flowme-
ter is used. To enable energy metering, proceed as follows:
Î Read the flow rate (gal/min) from the flowmeter at ma-
ximum 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
MED% to 50.
Heat transfer fluid:
0 : Water
1 : Propylene glycol
2 : Ethylene glycol
3 : Tyfocor ® LS / G-LS
For control and service work, the operating mode of the
controller can be manually adjusted. For this purpose, select
the adjustment value MAN1, MAN2 in which the following
adjustments can be made:
• MAN1 / MAN2
Operating mode
ON : relay on
Auto : relay in automatic operation
OFF : relay off
n1(2)LO: minimum speed
Note:
Always adjust the operating mode back to "Auto"
when the control and service work is completed.
Normal operation is not possible in manual mode.
In this adjustment channel the temperature unit can be
chosen.
The unit can be switched between °C and °F during operation.
If this item is selected, the controller will indicate the com-
missioning assistant and all prevous adjustment will be set
back to the factory settings.
HTL, set MEDT to 1 and
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(flashing) + + /
(flashing) +
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