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7.2 Change of head setting
Change the pump head by turning the selector switch on the terminal box as indicated in the table:
Setting
Result
Factory setting
Pump performance according to the
heating demand (in 80-90% of all
single-family houses).
Pump head is reduced.
Pump head is increased.
Pump running at minimum perform-
ance.
Pump running at medium perform-
ance.
Pump running at maximum perform-
ance.
7.3 Automatic night-time duty
Pumps incorporated in gas boilers with
small water content must never be set to
automatic night-time duty.
To ensure correct function of the automatic night-
time duty, these conditions must be fulfilled:
• The pump must be installed in the flow pipe.
• The system must be fitted with a flow temperature
sensor and a device for automatic control of the
changeover between normal duty and automatic
night-time duty.
To activate the automatic night-time duty, turn the
selector switch on the terminal box to position
see
. (Pos. 1 = automatic night-time duty, pos. 2 =
normal duty.)
Note: If the heating system is undersupplied (heat
capacity too low), check whether automatic night-
time duty has been activated. If yes, deactivate the
function.
8
System
Variable-load one- or two-pipe heating system with
normal resistance, with or without thermostatic
valves.
Variable-load heating system with low resistance,
with or without thermostatic valves.
Variable-load heating system with high resistance,
with or without thermostatic valves, or underfloor
heating system.
Also systems fitted with a bypass valve.
Small constant-load heating system.
Setting when adjusting a bypass valve.
Medium-sized constant-load heating system.
Large constant-load heating system.
Setting when venting the system.
Once automatic night-time duty has been activated,
the pump changes automatically between normal
duty and night-time duty, see
(Pos. 1 = normal duty, pos. 2 = without automatic
night-time duty, pos. 3 = with automatic night-time
duty.)
Changeover between normal duty and night-time
duty is dependent on the flow-pipe temperature.
The pump automatically changes over to night-time
duty when the built-in sensor registers a flow-pipe
temperature drop of more than 10-15°C within ap-
prox. 2 hours. The temperature drop must be at least
0.1°C/min.
Changeover to normal duty takes place without a
,
time lag when the temperature has increased by ap-
prox. 10°C.
Note: The night-time duty function is deactivated if
the selector switch has been set to speed I, II or III.
7.4 Pump control
During operation, the pump head will be changed ac-
cording to the principle "proportional-pressure con-
trol". In this control mode, the pump performance,
and consequently the power consumption, is ad-
justed to the actual water demand.
.
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