Grundfos ALPHA+ Series User manual
GRUNDFOS ALPHA+
GRUNDFOS INSTRUCTIONS
Installation and operating instructions
2
3
GRUNDFOS ALPHA+
Installation and operating instructions 4
Montage- und Betriebsanleitung 13
Notice d’installation et d’entretien 24
Istruzioni di installazione e funzionamento 35
Instrucciones de instalación y funcionamiento 46
Instruções de instalação e funcionamento 57
Οδηγίες εγκατάστασης και λειτουργίας 68
Installatie- en bedieningsinstructies 79
Monterings- och driftsinstruktion 90
Asennus- ja käyttöohjeet 99
Monterings- og driftsinstruktion 108
Instrukcja montażu i eksploatacji 117
Руководство по монтажу иэксплуатации 128
Szerelési és üzemeltetési utasítás 141
Navodila za montažo in obratovanje 152
Montažne i pogonske upute 161
Uputstvo za montažu i upotrebu 170
Instrucţiuni de instalare şi utilizare 181
Упътване за монтаж иексплоатация 191
Montážní a provozní návod 203
Návod na montáž a prevádzku 214
Montaj ve kullanım kılavuzu 225
Paigaldus- ja kasutusjuhend 234
Montavimo ir eksploatacijos instrukcija 243
Uzstādīšanas un ekspluatācijas instrukcija 252
4
Declaration of Conformity
We Grundfos declare under our sole responsibility that the prod-
uct GRUNDFOS ALPHA+, to which this declaration relates, is in
conformity with the Council Directives on the approximation of
the laws of the EC Member States relating to
– Machinery (98/37/EC).
Standard used: EN ISO 12100.
– Electromagnetic compatibility (89/336/EEC).
Standards used: EN 61000-6-2 and EN 61000-6-3.
– Electrical equipment designed for use within certain voltage
limits (73/23/EEC) [95].
Standards used: EN 60335-1: 2002 and EN 60335-2-51:
2003.
Bjerringbro, 1st April 2006
Svend Aage Kaae
Technical Director
1. General description
GRUNDFOS ALPHA+ is a range of circulator
pumps with integrated differential pressure con-
trol enabling adjustment of pump performance
to the actual system requirements. In many
systems, this will mean a considerable reduc-
tion in power consumption, prevent noise from
thermostatic valves and similar fittings, and im-
prove the control of the system.
2. Applications
GRUNDFOS ALPHA+ is designed for circulat-
ing liquids in heating systems. The pumps can
also be used in domestic hot-water systems.
Prior to installation, read these instal-
lation and operating instructions. In-
stallation and operation must comply
with local regulations and accepted
codes of good practice.
5
GRUNDFOS ALPHA+ 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 tempera-
ture and
• systems where night-time duty is desired.
2.1 Pumped liquids
Thin, clean, non-aggressive and non-explosive
liquids, not containing solid particles, fibres or
mineral oil.
In heating systems, the water should meet the
requirements 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+ 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 horizontal, see n, page 261.
Arrows on the pump housing indicate the liquid
flow direction through the pump.
See mounting dimensions at the end of these
instructions.
The pump must not be used for the
transfer of inflammable liquids such
as diesel oil, petrol or similar liquids.
Care should be taken to ensure that
persons cannot accidentally come
into contact with hot surfaces of the
pump.
6
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.
3.3 Bypass valve
3.4 Non-return valve
If a non-return valve is fitted in the pipe system,
see q, it must be ensured that the minimum
pump pressure is always higher than the clos-
ing pressure of the valve.
3.5 Air separator pump
4. Electrical connection
The electrical connection and protection should
be carried out in accordance with local regula-
tions.
Before the screws are removed, the
system must be drained or the isolat-
ing valves on either side of the pump
must be closed as the pumped liquid
may be scalding hot and under high
pressure.
If the pump is installed in a two-pipe
system with a bypass valve between
flow pipe and return pipe, it is recom-
mended to set the pump to constant
pressure control as illustrated in the
figure.
GRUNDFOS ALPHA+ pumps type A
must be fitted with an automatic air
vent. This must be fitted to the pump
housing before priming.
7
• The pump requires no external motor protec-
tion.
• The operating voltage and frequency are
marked on the pump nameplate. Make sure
that the motor is suitable for the electricity
supply on which it will be used.
• Mains connection is to be carried out as
shown in t.
• The green indicator light on the pump termi-
nal box indicates that the electricity supply
has been switched on.
5. 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
7. Technical data. The system cannot be
vented through the pump.
As the pump is self-venting, it need not be
vented before start-up.
The pump may be noisy, when first switched
on, due to air remaining in the chamber. This
noise should cease after a few minutes run-
ning.
The earth terminal of the pump must
be connected to earth.
The pump must be connected to an
external mains switch with a minimum
contact gap of 3 mm in all poles.
When the inspection screw is slack-
ened (see r), scalding hot liquid un-
der high pressure may escape. Care
should be taken to ensure that the es-
caping liquid does not cause personal
injury or damage to other compo-
nents.
8
6. Setting the pump
The selector switch on the pump terminal box
has been factory-set to the middle position.
This setting is suitable for 80-90% of all single-
family houses.
The selector switch for normal and night-time
duty has been factory-set to "normal duty". If
night-time duty is desired, see section 6.3 Auto-
matic night-time duty.
6.1 Factory settings
Pump type Head
ALPHA+ xx-40 Maximum head up to
4 metres
ALPHA+ xx-60 Maximum head up to
6 metres
9
6.2 Change of head setting
Change the pump head by turning the selector
switch on the terminal box as indicated in the
table below:
Setting Result System
Factory
setting Pump perform-
ance according
to the heating
demand
(in 80-90% of all
single-family
houses).
Variable-load heating
system with normal
resistance, with or
without thermostatic
valves.
Pump head is
reduced.
Variable-load heating
system with low
resistance, with or
without thermostatic
valves.
Pump head is
increased.
Variable-load heating
system with high re-
sistance, with or with-
out thermostatic
valves, or underfloor
heating system.
Also systems fitted
with a bypass valve.
Pump running
at minimum per-
formance.
Small constant-load
heating system.
Setting when adjust-
ing a bypass valve.
Pump running
at medium per-
formance.
Medium-sized
constant-load heating
system.
Pump running
at maximum per-
formance.
Large constant-load
heating system.
Setting when venting
the system.
10
6.3 Automatic night-time duty
To ensure correct function of the automatic
night-time duty, these conditions must be ful-
filled:
• The pump must be installed in the flow pipe.
• The system must be fitted with a flow tem-
perature 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 posi-
tion , see
u.
(Pos. 1 = automatic night-time duty, pos. 2 =
normal duty.)
Note: If the heating system is undersupplied
(heat capacity too low), check whether auto-
matic night-time duty has been activated. If yes,
deactivate the function.
Once automatic night-time duty has been acti-
vated, the pump changes automatically be-
tween normal duty and night-time duty, see v.
(Pos. 1 = normal duty, pos. 2 = without auto-
matic night-time duty, pos. 3 = with automatic
night-time duty.)
Changeover between normal duty and night-
time duty is dependent on the flow-pipe temper-
ature.
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 approx. 2 hours. The tempera-
ture 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 approx. 10°C.
Pumps incorporated in gas boilers
with small water content must never
be set to automatic night-time duty.
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