Protherm E8.4401, Operating Instructions Manual, Page: 39 / 60

Part 2: Overview of display values and settings
Expert area
39
04 => Return flow temperature increase via mixer motor
(only for HC2)
The heating circuit flow sensor is used as a heat generator
return flow sensor. The mixer motor controls to the heating
circuit set value for 24 hours [MIN T-FLOW].
Installation tip: Mixer motor OPEN => boiler flow is fed
into the return (=> return flow temperature increase)
Mixer motor CLOSED => heating circuit return is passed
through. When the mixer motor is open it must be ensured
that there is circulation through the HS (boiler pump).
05 => Header pump
(only for HC1)
The pump relay for the direct circuit is used as the header
pump for the cascade. The pump switches ON as soon as
heat is requested from the cascade. The pump switches
OFF when there is no longer a heat request and the follow-
up time has elapsed.
PUMP MODE (pump operating mode)
The circulation pumps are switched off if heating is not
required. The mixer motors are closed at the same time =>
"The heating circuit is switched off".
(Switch on with 1K hysteresis)
This adjustment concerns the weather dependent shut-
down. If room temperature regulation is enabled (ROOMS-
INFL > 0) the "thermostat function" takes effect in addition.
•
Room temperature > room set value + 1K
00 => Standard circulation pump control
Heating time:
•
Outside temperature > room set value + 1K
Reduction period:
ROOMS-INFL = 0
•
The switch-off occurs during the transition to reduction
operation.
•
Switch on with: Room temperature < room set value
The pump runs continuously after switching on.
ROOMS-INFL ="--":
•
Flow temperature setting < 20°C.
01 => Pump switching in accordance with heating limits
Heating time:
•
Outside temperature < daytime heating limit s
1K
Reduction period:
•
Outside temperature < night-time heating limit s
1K
02 => Pump switching in accordance with heating program
Heating time:
•
Pump is ON; Heat circuit is enabled
Reduction period:
•
Pump is OFF; Heat circuit is blocked
03 => Continuous operation
The runs continuously for 24 hrs.! The heating circuit is
permanently enabled.
MIXER OPEN (open mixer dynamic)
Speed setting at which the mixer motor opens when a
control difference occurs. The control difference at which