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74 | Menu settings INSTALLER SETTINGS (for installers only) US/CA
T2: Max. solar tank temperature: For a
detailed description of T2: Max. solar tank
temperature Æ page 50.
Maximum collector temperature: Use this
menu option to set the maximum temperature
at the collector temperature sensor (T
1
).
If the temperature detected at the collector
sensor (T
1
) rises above the set figure,
operation of the solar pump (SP) is disabled
until the temperature drops back below the
set figure.
SP: Collector field 1 pump mode: Use this
menu option to set the operating mode for the
solar pump (SP).
Auto: Automatically controlled operation
according to the set parameters.
Manual ON: Switches the pump
permanently on (e.g. for bleeding the solar
system when commissioning).
Manual OFF: Switches the pump
permanently off (e.g. for servicing work on
the solar system without having to
interrupt heating operation).
For menu structure and adjustment ranges
Æ page 61.
8.5.4 Parameters for solar heating boost
system
Menu: Solar sys parameters > 2. Heating
support
Use this menu to set the parameters for the solar
thermal system if you are using it for a heating
boost.
DWU1: ON delta T: Use this menu option to
set the start temperature differential for the
valve for return temperature raising (DWU1).
If the difference between the temperature in
the solar tank (T
3
) and the heating return
temperature (T
4
) exceeds the set value, the
return temperature raising (DWU1) switches
on.
DWU1: OFF delta T: Use this menu option to
set the stop temperature difference for the
valve for return temperature raising (DWU1).
If the difference between the temperature in
the solar tank (T
3
) and the heating return
temperature (T
4
) is less than the set value, the
return temperature raising (DWU1) switches
off.
DWU1: High return valve mode: Use this
menu option to select the operating mode of
the valve for return temperature raising
(DWU1).
Auto: Automatically controlled operation
according to the set parameters.
Manual ON: The adjustment drive of the
valve receives the switch signal and is
opened or closed permanently depending
on the construction of the valve (e.g. for
function test).
Manual OFF: The adjustment drive of the
valve receives no switch signal and remains
opened or closed permanently depending
on the construction of the valve (e.g. for
function test).
At temperatures above 284 °F
(140 °C) and system pressures
< 58 PSI (< 4 bar), the heat transfer
fluid in the collector evaporates.
The solar pump remains disabled
until the collector has cooled to a
temperature at which there is no
more vapor in the solar circuit.
74


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