Submittal Sheet

Functions
MAGNA3
4
23
Fig. 29 Proportional-pressure control with FLOW
LIMIT
Fig. 30 Constant-pressure control with FLOW
LIMIT
Fig. 31 Constant curve with FLOW
LIMIT
Automatic night setback
A night setback system is often integrated into a
building management system (BMS), or as part of an
equivalent electronic control system, which has a
built-in timer.
The feature is not beneficial in rooms with underfloor
heating because of the regulating inertia of the
underfloor heating.
Characteristics and key benefits
• Automatic night setback lowers the room
temperature at night, which reduces heating costs.
• The pump automatically changes between normal
duty and night setback (duty at low demand),
depending on the flow pipe temperature.
• Once activated, the pump runs on the minimum
curve.
Technical specifications
The pump automatically changes to night setback
when the built-in sensor registers a flow-pipe
temperature drop of more than 18 to 27 °F (10 to 15
°C) within approximately two hours. The temperature
drop must be at least 0.18 °F/min (0.1 °C/min).
Changeover to normal duty takes place without time
lag when the temperature has increased by
approximately 18 °F (10 °C).
Note: You cannot enable automatic night setback
when the pump is in constant-curve mode.
TM05 2543 0412TM05 2444 0312TM05 2542 0412
H
Q
2
H
set
H
set
MJNJU
Normal proportional-pressure
duty point
FLOW
LIMIT
duty point
H
Q
H
set
MJNJU
Normal constant-pressure
duty point
FLOW
LIMIT
duty point
H
Q
MJNJU
Normal constant-curve
duty point
FLOW
LIMIT
duty point