49
Return water control settings (measurement channel 4 has been taken into use for return water measurement)
Setting
Factory
setting:
Setting
range:
Information about settings:
Supply water free
temp. drop. at 0
Supp. water free
temp. drop. at -20
radiator heating
floor heating
Return water minimum limit
Return wat. min limit
outd temp -20
Return water maximum
limit
Return water
compensation
Summer function’s max
clearance delay
Valve position at
summer function
10 °C
15 °C
20 °C
7°C
10 °C
95 °C
2.0
10 h
Controlling
0...50 °C
0...50 °C
5..95 °C
5..95 °C
5...95 °C
0.0...4.0 °C
0...20 h
Controlling
Closed
In the stand-by function, the lower limit of the supply
water’s free temperature drop at an outdoor tempera-
ture of 0 °C and above.
In the stand-by function, the lower limit of the supply
water’s free temperature drop at an outdoor tempera-
ture of -20 °C or below. The stand-by function’s lowest
allowed supply water temperature with outdoor tem-
peratures between 0 °C...-20 °C changes linearly bet-
ween the above mentioned settings.
The minimum return water temperature with the outdoor temperature above 0 °C.
The minimum return water temperature with the outdoor temperature at -20 °C or below.
With outdor temperatures between 0 °C...-20 °C, the freezing protection limit changes li-
nearly between the above mentioned settings. The controller gives a freezing risk alarm if
the supply water temperature drops below the supply water minimum limit setting.
As a factory setting the return water temperature measurement is used as an informative
measurement. If you want other uses for the return water measurement, you can change
the highest allowed return water temperature. The controller begins lowering the supply
water temperature after the maximum limit has been exceeded.
The return water compensation changes the supply water temp. when the return water ex-
ceeds the return water max. limit or falls below the return water minimum limit. The supp-
ly water temp. change = “ return water compensation ratio” x “the amount of degrees that
the return water temp. exceeds the maximum limit / falls below the lower limit”. For examp-
le, if the comp. ration for the return water 2.0, and the temp. of the return water exceeds the
max. limit by 1.5°C, the return water temp. is lowered 3.0°C (2 x 1.5 °C = 3.0 °C).
The purpose of the summer function’s clearance delay is to delay heating so that in the sum-
mer the heat does not go on during the night when the temperature drops close to zero de-
grees for short periods of time. The clearance delay is the active summer function time x
1.7, but is limited to the maximum clearance delay that is set here. The clearance delay is
inactivated in the following instances: If the room sensor is in use and the room temperatu-
re drops at least 0,5° C below the setting, in the event of a power failure.
You can either set the temperature of the supply water in the H2 control circuit at its minimum
limit or you keep control activated in the H2 control circuit during summer function.
Stand-by settings:
+20
+15
+10
-20°C
Radiator heating
Floor heating
Outdoor temp.
Supply water
°C
In the stand-by function the
lower limit of the supply wa-
ter at different outdoor tempe-
ratures
+20
0
Taking heating control into use after a summer function:
