Rotex Controller Series, Product Documentation

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EbV Product documentation THETA NORM/UNIT
8-46
Operating mode 4 – Discharge control for HC requests only
System hydraulics:
Controller function:
Buffer demand
HC
As operating mode 3, except that the requests from DHW control are sent directly to
the heat generator.
An active hot-water priority only acts on the heating circuits when there is no buffer
discharge in progress.
See the table below for detailed correlations.
Operating mode 5 – Loading control with DHW switchover
System hydraulics:
The heating circuit controls send their demand value to buffer control. Hot-water and
buffer control request energy from the heat generator when required. The BULP
(PLP) output is ON during buffer discharge and DHW loading.
Any active DHW priority is not effective in this mode.
OS
BU
BS
BURN 1
Buffer
Heat-
generator
HC-P
VF1
VF2
MC1 MC2
Domestic hot
water
tank
BULP
SOL-P
DHWS
OS
BS
BULP
SOL-P
DHWS
HC-P
BU
VF1
VF2
MC1
MC2
BU-2
Buffer
Heat
generator