Grundfos ALPHA Pro, Installation And Operating Instructions Manual

Page: 6 / 146

6
CONTENTS
Page
1. General description 6
2. Applications 6
2.1 Pumped liquids 6
3. Installation 6
3.1 Terminal box positions 6
3.2 Changing the terminal box position 6
3.3 Bypass valve 7
3.4 Non-return valve 7
3.5 Air separator pump 7
4. Electrical connection 7
5. Start-up 7
6. Display 7
7. Setting the pump 7
7.1 Factory settings 7
7.2 Change of head setting 8
7.3 Automatic night-time duty 8
7.4 Pump control 8
8. Technical data 9
9. Fault finding chart 10
10. Disposal 10
Note: The figures referred to in these instructions
can be found on pages 140 to 143.
1. General description
The GRUNDFOS ALPHA Pro circulator pumps differ
from conventional circulator pumps in that they offer
• a display showing the actual pump power con-
sumption in Watt,
• optional automatic night-time duty,
• integrated permanent-magnet motor and
• integrated differential-pressure control enabling
continuous adjustment of the pump performance
to the actual system requirements.
The installation of a GRUNDFOS ALPHA Pro pro-
vides
• low energy consumption and
• a high degree of comfort as a result of minimum
noise from valves, etc.
2. Applications
GRUNDFOS ALPHA Pro is designed for circulating
liquids in heating systems. The pumps can also be
used in domestic hot-water systems.
GRUNDFOS ALPHA Pro is suitable for
• systems with constant or variable flows where it
is desirable to optimise the setting of the pump
duty point,
• systems with variable flow-pipe temperature
and
• systems where night-time duty is desired.
2.1 Pumped liquids
Thin, clean, non-aggressive and non-explosive liq-
uids, not containing solid particles, fibres or mineral
oil.
In heating systems , the water should meet the re-
quirements of accepted standards on water quality in
heating systems, e.g. the German standard
VDI 2035.
In domestic hot-water systems , it is advisable to
use GRUNDFOS ALPHA Pro pumps only for water
with a degree of hardness lower than approx. 14°dH.
For water with a higher degree of hardness, a direct-
coupled TPE pump is recommended.
3. Installation
The pump must be installed with the motor shaft hor-
izontal, see
n
.
The liquid flow direction through the pump is indi-
cated by arrows on the pump housing.
See mounting dimensions on page 144.
3.1 Terminal box positions
The terminal box can be turned to the positions
shown in
o
.
3.2 Changing the terminal box position
Change the terminal box position as shown in
p
.
Prior to installation, read these installation
and operating instructions. Installation and
operation must comply with local regula-
tions and accepted codes of good prac-
tice.
The pump must not be used for the trans-
fer of inflammable liquids such as diesel
oil, petrol or similar liquids.
Make sure that persons cannot accidentally
come into contact with hot surfaces of the
pump.
The pumped liquid may be scalding hot
and under high pressure! Drain the system
or close the isolating valves on either side
of the pump before the screws are re-
moved.