Lowara E6 PWM Series User manual

E6 PWM7
for heating and cooling
application
Installation and
operating instructions
-cod. 671075146 rev. A ed. 09/2012-

2
en « Original instructions »
These installation and operating instructions must be followed during
installation and operation. Read them carefully. We recommend that
you keep these instructions where the device is used. Particular
attention must be paid to instructions marked as follows:
Failure to follow these instructions may lead to personal
safety risks.
Failure to follow these instructions may lead to the
malfunction and possible damage of the device.
1. Safety instructions
This appliance is not to be used by children or persons
with reduced physical, sensory or mental capabilities, or
persons with a lack of experience or knowledge, unless
suitably supervised or unless provided with suitable
instructions.
Children should be supervised at all times and should
not play with appliance.
The pump must NOT be used with a damaged cord or
enclosure.
Other relevant regulations should also be followed: e.g. accident
prevention regulations or the internal operating and safety instructions
of the system manufacturer.
Failure to follow these instructions can result in the loss of all
entitlements to claim damages.
2. General Description (figure 5)
E6 PWM circulation pumps are shaftless spherical motor pumps with
energy-efficient, electronically commutated permanent magnet
technology (ECM technology) for use in hot water heating systems,
heat pumps, solar systems, air conditioning systems, closed cooling
circuits and industrial circulation systems.
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For technical reasons, the contact surface between the rotor and the
ceramic ball bearing in spherical motor pumps is very small. For this
reason, even if they have not been in operation for a long time, such as
after the summer, only a small amount of torque is required to start the
pump. E6 PWM pumps do not require (and thus do not have) a
release/vent screw.
E6 PWM pump is a speed controlled pump via external PWM (Pulse
Width Modulation) signal. The pump has a standby function thus the
pump can be disabled with power supply remained connected. In this
mode the power is <1W.
It is very important to connect the PWM signal with the right polarity.
Brown= +PWM; Blue= GND (see figure 6)
These E6 PWM pump has the PWM7 control curve, see below:
Series Max. delivery
height Max. delivery volume
E6 PWM7 NIBE 5,6 m 3500 l/h
E6 PWM7 NIBE ST2 6 m 4000 l/h

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
Rated connection
width DN For pipe thread Pump connection thread
25 1“ G 1 ½“

Installation length (see fig. 1): 180 mm
3. Dimensions (see figure 1)
4. Technical Specifications

Motor model Electronically commutated spherical motor
with permanent magnet rotor
E6 PWM7.. NIBE E6 PWM7..NIBE ST2
Rated voltage 230 V 230 V
Frequency 50/60 Hz 50/60 Hz
Power consumption 9-75 W 9-110 W
IP protection IP 42 IP 42
Insulation class Class F Class F
Max. system pressure 10 bar 10 bar
Permitted temperature
range of pumped fluid -10 °C*to +95 °C -10 °C* to +60 °C
Permitted pumping
media Heating water according to VDI 2035, water/glycol mixtures**
* Must not freeze. To avoid condensation the fluid temperature
must always be higher than the ambient temperature.
** Performance of the pump will noticeably change when pumping
water/glycol mixtures with concentrations higher than 20%.

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5. Characteristic Curve (see figure 2)
6. Installation Advice
The installation of a stop valve upstream and downstream of the pump
is recommended so the pump can be replaced at a later time without
the need to completely drain the system.
7. Installation
The unit may not be installed in areas where there is a
danger of explosion and may not be used to pump
flammable liquids.
Figure 3: Only install in dry, frost-proof rooms in one of the permitted
fitting positions.
The use of thermal insulation shells, available from the manufacturer,
is recommended when a thermal insulation of the pump is required.
When using other materials, leave the motor housing uninsulated,
otherwise the electronics may overheat and the pump may
automatically switch off.
Screw connections for installing the pump in the system are not
included in the scope of delivery. Use new gaskets (included in the
scope of delivery) when installing the pump.
The customer must take appropriate isolation measures and provide
appropriate acoustic insulation to reduce possible noise transfer.
7.1 Electrical connection (see figure 6)
The unit may only be connected by an authorized
electrician. The pump is equipped with a factory
installed cable.
The PWM wire must be connected to the controller with
the right polarity mentioned. ( see figure 6 )
The pump requires a separate circuit breaker installed
on the phase with a rated value of 10A. The socket must
be positioned in such way that no water can drip onto it
even in the event of damage to the piping.
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7.2 Getting started
The pump must not run dry as this can result in the
destruction of the bearing in a very short time. Fill it with
liquid before first start-up.
Before starting, the system must be:
- Rinsed thoroughly to prevent the presence of foreign objects and
impurities which could block the pump.
- Fully filled with the pumped media (water or water-glycol mix).
8. Maintenance/Disassembly
Pumps are subject to wear. If the pump is blocked (see section 9) or
grinding noises are audible, check the pump and replace it if
necessary. Procedure:
- Disconnect the pump from the mains.
- Shut off supply and drain lines. If there are no shut-off
devices, drain the system so that the fluid level is
beneath that of the pump.
- Loosen the union nut by hand or with an appropriate
tool (such as a strap wrench) and carefully pull the
motor out of the pump housing.
Residual water may leak out of the rotor cavity. Prevent
the pump's electrical connection from getting wet.
For figure 4:
- Carefully but firmly pull the rotor / impeller upward by hand and
remove it.
- If necessary, remove foreign bodies and impurities/deposits with
appropriate agents. Reinsert the rotor / impeller.
- The bearing is worn if the rotor / impeller cannot be freely moved or if
wear marks are visible. In this case, replace the rotor, the pump
motor, or the entire pump.
$77(17,21
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$77(17,21
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9. Disposal
This product and parts thereof must be disposed of in an
environmentally friendly manner. Applicable local regulations must be
followed.
10. Exploded View (see figure 5)
1. Supply cable
2. PWM signal cable
3. Stator/pump motor
4. Union nut
5. O-ring
6. Impeller / Rotor
7. Pump housing
8. Connection thread

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11. EC DECLARATION OF CONFORMITY « ORIGINAL »
LOWARA SRL UNIPERSONALE, WITH HEADQUARTERS IN VIA
VITTORIO LOMBARDI 14 - 36075 MONTECCHIO MAGGIORE VI -
ITALIA, HEREBY DECLARES THAT THE PRODUCT
E6 PWM7 25/180G NIBE
E6 PWM7 25/180G NIBE ST2
FULFILLS THE RELEVANT PROVISIONS OF THE FOLLOWING
EUROPEAN DIRECTIVES
• MACHINERY 2006/42/EC (ANNEX II: THE TECHNICAL FILE IS
AVAILABLE FROM XYLEM WATER SYSTEMS HUNGARY KFT,
KÜLSė-KÁTAI ÚT 41, 2700 CEGLÉD, MAGYARORSZÁG).
• ELECTROMAGNETIC COMPATIBILITY 2004/108/EC
AND THE FOLLOWING TECHNICAL STANDARDS
• EN 60335-1, EN 60335-2-51
• EN 55014-1:2006+A1:2009, EN 55014-2:1997+A1:2001+A2:2008
MONTECCHIO MAGGIORE, 16.09.2012
AMEDEO VALENTE
(DIRECTOR OF ENGINEERING AND R&D)
rev.00
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1
H H1 D F DN kg
mm
E6-…25/180 NIBE 180 90 R 1 R 1½ 25 2,4
E6-…25/180 NIBE ST2 180 90 R 1 R 1½ 25 2,4

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2 Hydraulic curves
H [m]
0
1
2
3
4
5
6
0 2 4 6 8 10 12
H [ft]
0
5
10
15
0 2 4 6 8 10
H [kPa]
0
10
20
30
40
50
0,0 0,5 1,0 1,5 2,0 2,5 3,0
P [W]
0
10
20
30
40
50
60
70
80
0,0 0,2 0,4 0,6 0,8
02980_E_CH
Q [US gpm]
Q [Imp gpm]
Q [m
3
/h]
Q [l/s]
E6-PWM7 25/180G NIBE EN 16297-2
0%
20%
40%
60%
80%
0%
20%
40%
60% 80%