Appendix
0020200954_00 SUSTAIN ..c Installation and maintenance instructions 29
Setting level Values
Unit Increment, select, explanation
Default set-
ting
Own setting
Min. Max.
d.04 Water temperature in the
cylinder
Current value ℃ – – Not
adjustable
d.05 Determined heating flow
set target temperature
Current value
℃ – – Not
adjustable
d.06 Hot water set target tem-
perature
Current value ℃ (Combination unit only) – Not
adjustable
d.07 Set target temperature
for the domestic hot water
cylinder
Current value ℃ – – Not
adjustable
d.08 Status of the 230 V ther-
mostat
Current value – 0 = Room thermostat open (no heat
requirement)
1 = Room thermostat closed (heat
requirement)
– Not
adjustable
d.09 Heating flow set target
temperature that is set on the
eBUS room thermostat
Current value – – – Not
adjustable
d.10 Status of the internal
pump in the heating circuit
Current value – off / on – Not
adjustable
d.11 Status of the heating cir-
cuit's shunt pump
Current value – off / on – Not
adjustable
d.13 Status of the hot water
circuit's circulation pump
Current value – off / on – Not
adjustable
d.14 Operating mode of the
modulating pump
0 5 – 0 = Speed-controlled (auto)
1; 2; 3; 4; 5 = Fixed rotational speeds
→ Section "Setting the pump output"
0 Adjustable
d.15 Pump speed Current value % – – Not
adjustable
d.16 Status of the 24 V room
thermostat
Current value – off = Heating off
on = Heating on
– Not
adjustable
d.17 Heating control – – – off = Flow temperature
on = Return temperature (adjustment
for underfloor heating. If you have ac-
tivated the return temperature control,
the automatic heating output determ-
ination function is not active.)
0 Adjustable
d.18 Pump overrun operating
mode
1 3 – 1 = Comfort (continuously operating
pump)
3 = Eco (intermittent pump mode –
for the dissipation of the residual heat
after hot water generation at an ex-
tremely low heat demand)
1 Adjustable
d.19 Pump operating mode,
2‑stage pump
0 3 – 0 = Burner mode stage 2, pump
flow/overrun stage 1
1 = Heating mode and pump
flow/overrun stage 1, hot water
handling mode stage 2
2 = Automatic heating mode, pump
flow/overrun stage 1, hot water hand-
ling mode stage 2
3 = Stage 2
3 Adjustable
d.20 Maximum hot water set
target temperature
50 60 ℃ 1 50 Adjustable
d.21 Status of the warm start
for hot water
Current value – off = Function deactivated
on = Function activated and available
– Not
adjustable
d.22 Status of the hot water
request
Current value – off = No current requirement
on = Current requirement
– Not
adjustable
d.23 Status of the heating de-
mand
Current value – off = Heating off (Summer mode)
on = Heating on
– Not
adjustable
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