Technische Alternative HZR 65, Operation And Installation Instructions Manual

Page: 5 / 60

5
Generally applicable rules
for the following diagrams:
The hydraulic diagrams of this manual are only diagrams in principle. They do not de-
scribe or replace a professional system development. There is no guarantee for func-
tion if directly copied.
When used for floor and/or wall heaters: Here, a safety thermostat must be used just
as with conventional heater controllers. It has to switch off the heating circuit pump if
there is overheating regardless of the output from the controller to prevent indirect
damage from excess temperatures.
It is necessary to set all „
Required settings
“ mentioned in the hydraulic diagrams.
" All pr1 (+2, +4, +8)" indicates that the selected program number can be in-
creased by the sum total of these numbers.
Example : Diagram 16, program 19 (=16+1+2): basic function (automatic boiler, hot
water tank, heating circuit, burner requirement) & boiler priority & switching the burner
requirement over 2 sensors.

The term „
heating = active
“ in the link formulas describes the conditions specified in
the menu heating pumps parameters “
HPu
” for additional release resp. blocking condi-
tions of the heating pump and the mixer. According to the factory settings heating
pump and mixer are released, when the calculated nominal
flow temperature “
Vsoll
”
exceeds the min
imum flow temperature “
Vmin
”.
The factory settings cause the heating pump switch-off, when the calculated nominal
flow temperature “
Vsoll
” falls below the adjusted minimum flow temperature “
Vmin
”.
The mixer will be closed, when the heating pump is switched off. The temperature
threshold for frost protection mode is set to 5.0°C ex works and the mixer operating
mode to outdoor temperature control (
Atr ).
Frost protection heating circuit : The heating circuit pump A1 will be switched on
under cer
tain conditions (see chapter “Frost protection conditions for heating circuit”).
Frost protection tanks : According to the program the burner requirement A5 and/or
load pump A2 will be activated when the temperature falls below frost the protection
temperature at a certain sensor. Programs of diagram 64 as well as programs 112,
113, 130 and 131 have no frost protection of tanks.
With activated legionella protection function the thermostat function of the hot water
tank sensor affects the feed pump and the burner requirement.
The potential-free output A5 (situated in the right part of the housing below the sensor
terminals) is mainly arranged for boiler requirement of fossil fuel or pellets boilers. If
this output is used for controlling a pump (e.g. diagram 64), a connection between
supply line (phase L) and output terminal W has to be assembled.
In diagrams with a holding circuit (= burner requirement with a sensor, shut-down
function with another one), the shut-
down transducer is “dominant”. In other words, if
improper parameters or sensor installation leads to the fulfillment of both the shut-on
and shut-off conditions, the shut-off condition has priority.