9
6. Start-up
Do not start the pump until the system has been filled
with liquid and vented. Furthermore, the required
minimum inlet pressure must be available at the
pump inlet, see section
.
The system cannot be vented through the pump.
7. Functions
Most functions can be selected on the pump control panel. However, some functions can only be selected with
the R100 or via expansion modules.
On the pump control panel, see fig. 11, page 15:
•
AUTO
ADAPT
(factory setting)
Recommended for most heating installations.
During operation, the pump automatically makes the necessary adjustment to the actual system
characteristic. This setting ensures minimum energy consumption and noise level which reduces
operating costs and increases comfort.
•
Proportional-pressure control
The pump head is changed continuously in accordance with the water demand in the system. The desired
setpoint can be set on the pump control panel.
•
Constant-pressure control
A constant head is maintained, irrespective of water demand. The desired setpoint can be set on the pump
control panel.
•
Automatic night-time duty
The pump changes automatically between normal duty and night-time duty depending on the flow-pipe
temperature. Automatic night-time duty can be combined with the above-mentioned control modes.
Further functions:
With the R100 remote control:
•
Constant-curve duty
The pump runs at a constant speed, on or between the max. and min. curves.
•
Temperature influence
The pump head varies depending on the liquid temperature.
Via expansion modules:
GENI module
•
External analog control
of head or speed via a signal from an external 0-10 V signal transmitter.
•
External forced control
via inputs for:
- Max. curve
- Min. curve.
•
Bus communication via GENIbus
The pump can be controlled and monitored by a Grundfos Control MPC Series 2000, a building
management system or another type of external control system.
•
Control of twin-head pumps
The control of twin-head pumps is described in section
.
•
External start/stop
The pump can be started and stopped via the digital input.
•
Fault, ready and operating indication via signal relay
The pump controls an external fault, ready and operating signal relay via a potential-free output.
The function of the signal relay is set with the R100.
Relay module
•
External start/stop
The pump can be started and stopped via the digital input.
•
Fault, ready and operating indication via signal relay
The pump controls an external fault, ready and operating signal relay via a potential-free output.
The function of the signal relay is set with the R100.
Summary of Contents for MAGNA 25-100
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