© Viessmann 5443203
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SCU224
Adjustment Channels
Channel Description Factory setting Page
Arr x System 3 39
DT O x Switch-on temperature difference 12.0 °Ra [6.0 K] 39
DT F x Switch-off temperature difference 8.0 °Ra [4.0 K] 39
DT S x Nominal temperature difference 20.0 °Ra [10.0 K] 39
RIS x Rise control R1 4 °Ra [2 K] 39
n1MN x Minimum pump speed R1 30 % 39
S MX x Maximum tank temperature 140 °F [60 °C] 40
EM x
Emergency temperature collector 270 °F [130 °C] 40
Emergency temperature collector if ODB is activated: 200 °F [95 °C] 40
OCC x Option collector cooling
OFF 41
CMX x* Maximum collector temperature
230 °F [110 °C] 41
OSYC x Option system cooling OFF 41
DTCO x* Cooling switch-on temperature difference
40.0 °Ra [20.0 K]
41
DTCF x* Cooling switch-off temperature difference
30.0 °Ra [15.0 K]
41
OSTC x Option tank cooling OFF 42
OHOL x* Option holiday cooling OFF 42
THOL x* Holiday cooling temperature 110 °F [40 °C] 42
OCN x Option minimum limitation OFF 42
CMN x* Minimum collector temperature 50 °F [10 °C] 42
OCF x Option antifreeze OFF 42
CFR x* Antifreeze temperature 40.0 °F [4.0 °C] 42
O TC x Option tube collector OFF 44
TCST x* OTC starting time 07:00 44
TCEN x* OTC ending time 19:00 44
TCRU x* OTC runtime 30 s 44
TCIN x* OTC standstill interval 30 min 44
OHQM x Option energy metering OFF 44
FMAX x* Maximum flow 6.0 l 44
MEDT x* Antifreeze type 1 44
MED% x* Antifreeze concentration 45 % 44
AH O s Switch-on temp. for thermostat 1 110 °F [40 °C] 14
AH F s Switch-off temp. for thermostat 1 120 °F [45 °C] 14
t1 O s Switch-on time 1 thermostat 00:00 14
t1 F s Switch-off time 1 thermostat 00:00 14
t2 O s Switch-on time 2 thermostat 00:00 14
t2 F s Switch-off time 2 thermostat 00:00 14
t3 O s Switch-on time 3 thermostat 00:00 14
t3 F s Switch-off time 3 thermostat 00:00 14
ODB x Drainback option OFF 45
tDTO x* ODB switch-on condition - time period 60 s 45
tFLL x* ODB filling time 5.0 min 45
tSTB x* ODB stabilization time 2.0 min 45
OTD s Option thermal disinfection OFF 15
PDIS s* Monitoring period 01:00 15
DDIS s* Heating period 01:00 15
TDIS s* Disinfection temperature 140 °F [60 °C] 15
SDIS s* Starting time 00:00 15
MAN1 x Manual operation R1 Auto 46
MAN2 x Manual operation R2 Auto 46
LANG x Language En 46
UNIT x Temperature unit °C 46
RESE x Reset - back to factory defaults 46
W0050100 Version number
Legend:
Symbol Specification
x Channel is available
x* Channel is available if the corresponding option is activated.
s Channel is specifically available in this system layout
s* System-specific channel, only available if the corresponding option is activated
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