Grundfos ALPHA2 User Manual

18
8.2 Function of Automatic Night SetBack
Once Automatic Night SetBack has been activated, the pump changes
automatically between normal duty and night setback. See 11. Pump
settings and pump performance.
Changeover between normal duty and night setback is dependent on the
flow-pipe temperature.
The pump automatically changes over to night setback when a flow-pipe
temperature drop of more than 10-15 °C within approx. 2 hours is
registered. The temperature drop must be at least 0.1 °C/min.
Changeover to normal duty takes place without a time lag when the flow-
pipe temperature has increased by approx. 10 °C.

Grundfos ALPHA2 Specifications

General

Max Head	8 m
Voltage	230 V
Frequency	50/60 Hz
Type	Circulator Pump
Max. operating pressure	10 bar
Series	ALPHA2
Connection Type	Threaded
Protection Class	IP42
Liquid Temperature Range	2°C to 110°C
Energy Efficiency Index	≤ 0.23
Connection size	G 1 1/2
EEI	≤ 0.23