HST EPS Series User guide

Installation and Operating Instruction
Heiz- und Sanitärtechnik GmbH
Ziegeleistraße 1
5020 Salzburg / AUSTRIA
EPS Series Energy-saving Pipeline Canned Motor Pump
with speed control via PWM signal
for heating and solar systems

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TABLE OF-
CONTENTS

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Table of Contents
Installation dimensions & technical data ........................................................................... 5
1. Overview ..................................................................................................................... 8
2. Service conditions ........................................................................................................ 9
3. Installation................................................................................................................. 10
4. Electrical connection .................................................................................................. 13
5. Control panel ............................................................................................................ 14
6. Setting of electric pump ............................................................................................. 15
7. PWM Signal Control Mode ....................................................................................... 17
8. bypass valve system (fitted between inlet pipeline and return pipeline)....................... 20
9. Startup....................................................................................................................... 21
10. Settings and performance of pump.......................................................................... 22
11. Performance curve ................................................................................................... 23
12. Characteristics.......................................................................................................... 26
13. Technical data and installation dimension................................................................. 27
Startwatt – Power input – Model – Voltage - Current ............................................. 28
14. Fault checklist .......................................................................................................... 30

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DIMENSIONS
&
TECHNICAL DATA

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Model
Size (mm)
L1
L2
B1
B2
H1
H2
G
Connection
HSTEPS 25-4 180
90
180
45
90
90
127
1½”
1”
HSTEPS 25-6 180
90
180
45
90
90
127
1½”
1”
HSTEPS 25-7.5 180
90
180
45
90
90
127
1½”
1”
HSTEPS 32-4 180
90
180
45
90
90
127
2”
1¼”
HSTEPS 32-6 180
90
180
45
90
90
127
2”
1¼”
HSTEPS 32-7.5 180
90
180
52
99
128
156
2”
1¼”
HSTEPS 20-6 130
65
130
45
90
94
122
1”
¾”
HSTEPS 25-4 130
65
130
45
90
90
127
1½”
1”
HSTEPS 25-6 130
65
130
45
90
90
127
1½”
1”
HSTEPS 25-11 180
90
180
66
132
132
170
1½”
1”
HSTEPS 32-11 180
90
180
66
132
132
170
2”
1¼”
max.head
max. Flow
power consumption
voltage
mains frequency
HSTEPS 25-4 180
4m
2,5 m3/h
5 – 22 Watt
230V
50 Hz /60 Hz
HSTEPS 25-6 180
6m
3,2 m3/h
5 – 45 Watt
HSTEPS 25-7.5 180
7,5m
3,4 m3/h
5 – 70 Watt
HSTEPS 32-4 180
4m
2,8 m3/h
5 – 22 Watt
HSTEPS 32-6 180
6m
3,6 m3/h
5 – 45 Watt
HSTEPS 32-7.5 180
7,5m
3,8 m3/h
5 – 70 Watt
HSTEPS 20-6 130
6m
2,8 m3/h
5 – 45 Watt
HSTEPS 25-4 130
4m
2,5 m3/h
5 – 22 Watt
HSTEPS 25-6 130
6m
3,2 m3/h
5 – 45 Watt
HSTEPS 25-11 180
11m
5,5 m3/h
5 - 140 Watt
HSTEPS 32-11 180
11m
7,0 m3/h
5 - 140 Watt
INSTALLATION DIMENSIONS & TECHNICAL DATA

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Precautions for use of EP Series products:
1. The installation manual should be read carefully before installation and use.
2. Any failure to comply with the content marked by safety warning marks may cause personal
injury, pump damage and other property loss, for which, the manufacturer shall not assume
any responsibility and compensation.
3. Installer, operator and user must comply with the local safety regulations.
4. The user must confirm that installation and maintenance of the product should be conducted
by staff proficient in the instructions and having professional qualification certificates.
5. Pumps must not be installed in damp environment or places that may be splashed by water.
6. In order to facilitate maintenance, one stop valve should be installed on each side of the
pump inlet and outlet respectively.
7. The power supply of pump should be cut off during installation and maintenance.
8. Pump with copper or stainless steel body should be adopted to the domestic hot water
Circulation.
9. The heat feed pipeline should not be supplemented with non-softened water frequently to
avoid an increase in the calcium in the circulating water of pipeline so as not to clog
impellers.
10. It is prohibited to start the pump when there is no pumping liquid.
11. Some models can not be used for diet water.
12. Pumping liquid may be of high temperature and pressure, therefore, liquid in the system
should be drained off or stop valves on both sides of the pump must be switched off to avoid
burns before moving and removing pump.
13. In the summer or when the ambient temperature is high, attention should be paid to
ventilation so as to prevent moisture condensation and cause electrical fault.
14. In the winter, if the pump system does not operate or when the ambient temperature is
below 0℃, liquid in the pipeline system should be emptied to avoid causing frost crack to
the pump body.
15. If the pump does not use for a long time, please turn off the conduit valves on pump inlet
and outlet ends and cut off the power of pump.
16. If he flexible cord is damaged, please connect service center to have it replaced together
with the connector.
17. If it is found that the motor is burning hot and abnormal, immediately turn off the valve on
the pump inlet end and cut off the pump power, besides, immediately contact your local
dealer or service center.

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18. If the pump failure can not be cleared in accordance with the description in the instructions,
immediately turn off the valve on the pump inlet end and cut off the pump power, besides,
immediately contact your local dealer or service center.
19. The product should be placed out of the reach of children, after installation, isolation
measures should be taken to prevent children from touching.
20. The product should be placed in a dry, ventilated and cool place and stored at room
temperature.
21. This appliance can be used by children aged from 8 years and above and persons with
reduced physical, sensory or mental capabilities or lack of experience and knowledge if they
have been given supervision or instruction concerning use of the appliance in a safe way
and understand the hazards involved. Children shall not play with the appliance. Cleaning
and user maintenance shall not be made by children without supervision.
Warning
Before starting installation, the Installation and Operating
Instructions of device must be read carefully. Installation and use of
the device must comply with local regulations and follow good
operation specification.
Warning：
Personnel with physical decline, dysesthesia or poor mental ability
and lacking of experience and relevant knowledge (including
children) should use the pump under the supervision and guidance
of people who can take charge of their safety.
Symbol description
Warning：
Failure to comply with this security declaration will likely result in
personal injury!
Failure to comply with this security declaration will likely cause
failure or damage to the equipment!
Notes or instructions facilitating the work and ensuring operational
safety.
Caution
Note

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1. OVERVIEW
1.1 EPS series circulating pump is mainly used for the water circulation in homeheating and
domestic hot water system.
EPS series circulating pump is most suitable for the following system:
1. Stable heating system with variable flow
2. Heating system with variable pipeline temperature
3. Solar system
4. Industrial circulation system
5. Home heating and domestic water supply system
EPS series circulating pump is equipped with a permanent magnet motor and
differential pressure controller which can adjust the performance of electric pump
automatically and continuously to meet the actual needs of the system.
EPS series circulating pump is equipped with control panel on the front, which is
convenient for the operation of users.
1.2 Advantages of installation of EPS series circulating pump
1. Easy installation and start-up
2. EPS series circulating pump has Autoadaptation mode AUTO (factory settings).
In most cases, you can start the pump without need to make any adjustments and
automatically adjust it to meet the actual needs of the system.
3. High comfort
4. The running noise of pump and the whole system is low.
5. Low energy consumption
6. Compared with the conventional circulating pump, its energy consumption is very low.
7. The minimum energy consumption of EPS series circulating pump can reach 5W.

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2. SERVICE CONDITIONS
2.1 Ambient temperature
The ambient temperature is 0℃～+70℃.
2.2 Relative humidity of the air (RH)
The maximum humidity is 95%.
2.3 Media (conveying liquid) temperature
Temperature of liquid conveying +2℃～110℃.To prevent the control box and stator
from appearing condensate water, the temperature of pump conveying liquid must
be always higher than the ambient temperature.
2.4 System pressure
The maximum is 1.0 Mpa (10 bar).
2.5 Protection Level
IP 44
2.6 Inlet pressureto avoid damage to the pump bearing caused by cavitation noise, the
following minimum pressure should be maintained in the pump inlet:
2.7 Pumping liquid
Thin, clean, non-corrosive and non-explosive liquid does not contain any solid particles,
fibers or mineral oil; the pump should not be used for conveying flammable liquid such
as vegetable oil and gasoline absolutely. If the circulating pump is used for the case of
high viscosity, the pump performance will reduce, therefore, when selecting a pump, the
viscosity of liquid must be considered.
Liquid temperature
＜85℃
90℃
110℃
Inlet pressure
0.05bar
0.28bar
1bar
0.5m
5m head
10.8m head

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3. INSTALLATION
3.1 Installation
1. Install EPS series circulating pump, arrows on the pump housing indicate the direction
of liquid flowing through the pump body.
2. When the pump is installed on the pipeline, its inlet and outlet must be installed with
two leather packings provided.
3. During installation, the pump shaft must be in the horizontal position.
3.2 Position of junction box

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3.3 Change to the position of junction box
The junction box can rotate in 90°To change the position of junction box, follow the operating
steps below:
1. Switch the valves of inlet and outlet and conduct decompression;
2. Loosen and remove the four socket head cap screws that fix the pump body;
3. Rotate the motor to the desired position and match the four screw holes;
4. Put the four socket head cap screws back and tighten them in the cross direction order;
5. Open the valve of inlet and outlet.
Warning:
Pumping liquid may be of high temperature and pressure, therefore,
liquid in the system should be drained off or valves on both sides of
the pump must be switched off before removing socket head cap
screws.
Change the position of junction box, the pump should not be started
until the system has been filled with pumping liquid or valves on
both sides of the pump are open.
Caution

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3.4 Thermal insulation of electric pump body
Restrict the thermal losses of electric pump body and pipeline.
Conduct thermal insulation for electric pump body and pipeline so
as to reduce the thermal losses of pump and pipeline.
Isolating or covering junction box and control panel is not allowed.
Caution
Note

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4. ELECTRICAL CONNECTION
The pump can work with either a
power switch (power connection) or heating control
get connected.
Electrical connection and protection should be carried out in accordance with local
regulations.
Warning：
The electric pump must be connected to earth wire
The pump must be connected with an external power switch or
heating control; the minimum gap between all the electrodes is 3 mm.
1. EPS series circulating pump does not need external motor protection. Check whether
the voltage of power supply and frequency match with the parameters marked by pump
nameplate.
2. Use the pump associated plug to connect power supply.
3. If the indicator lamp on the control panel lights, it indicates that the power supply is
switched on.

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5. CONTROL PANEL
5.1 Components on the control panel
Special Note
1. If I and II display at the same time, means BL1. If I and III display at the same time,
means BL2. If I and Auto display at the same time, means BI3
2. If II and III display at the same time, means HD1. If II and Auto display at the same time,
means HD2. If II and P display at the same time, means HD3.
5.2 Fault code display status
After the power is turned on, position 6 light area displays the status. During operation, the
gear display light is on constantly.When the electric pump can not operate properly, the gear
display light will flash continuously, the corresponding faults are as shown below:
Faultcode
Fault description
Gearlight 1 flickers
Over-voltage protection, restart after voltage returns to normal (lowvoltage protection value 270+5V)
Gearlight 2 flickers
Under-voltage protection, restart after voltage returns to normal (low-voltage protection value 165+5V)
Gearlight 3 flickers
Over-current protection, restart after 5s
Gearlight 4 flickers
Under-load protection, restart after 5s
Gearlight 5 flickers
Over-Phase protection, restart after 5s
Gearlight1+2flickers
Locked-rotor protection, restart after 5s
Gearlight1+3flickers
Start failure (asymmetric motor parameters), restart after 5s
Gearlight1+4flickers
Over-heat protection, power reduced to half of the maximum power, ambient temperature restored
to the range of use, power restored to the maximum
Gearlight1+5flickers
Over-temperature protection, restart after environment temperature restores to 5s in use range.
If the fault is displayed, the power supply must be disconnected to facilitate troubleshooting,
after troubleshooting, switch on the power supply again and re-start the electric pump.
No.
Explanation
1
The pump I, II, III gear display
2
The pump automatic gearshift
display (Auto)
3
The pump PWM gear display
4
The pump gear shifting button

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5.3 Light area displaying the settings of electric pump
EP series circulating pump has 9 kinds of settings, which can be selected by buttons.
The setting of electric pump is indicated by the light lit of 9 locations:
Key position
Number of times of key
Fixed light area
Explanation
2
0
AUTO
Auto adaptation
1, 2, 3
BL1/BL2
Proportional pressure curve
4, 5, 6
HD1/HD2
Constant pressure curve
7, 8, 10
HS1/HS2/HS3
Constant speed curve
6. SETTING OF ELECTRIC PUMP
6.1 The electric pump should be set according to system type

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Factory settings=AUTO (autoadaptation mode)
Recommended and available settings of pump
1.AUTO (autoadaptation) mode shall adjust the pump performance automatically according to
the actual heat demand of system. Since performance is adjusted gradually, it is recommended
that leave it in the AUTO (autoadaptation) mode for at least a week before changing the
settings of pump.
2.If you choose to change back to AUTO (autoadaptation) mode, EPS series pump can
remember the set points of its previous AUTO mode and continue to adjust the performance
automatically.
3.Pump settings change from optimal settings to other optional settings
4.Heating system is a slow system, it is impossible to achieve optimal operation mode within
several minutes or hours. If the optimal settings of pump fail to achieve ideal heat distribution
for each room, you should change the pump settings to other settings.
5.For the relationship between pump settings and performance curve, please see Section 9.1.
6.2 The control on electric pump
During the operation of pump, control it according to "proportional pressure control" (BL)
principle or "constant pressure control" (HD) principle.
In these two controlmodes, the performance of pump and correspondingpower consumption
should be adjusted according to the heat demand of system.
Proportional pressure control
In this control mode, the pressure difference on both ends of the electric pump shall
becontrolled by flow. Proportional pressure curve in Q / H diagram is represented by
BL1/BL2/BL3 (Section 9).
Constant pressure control
In this control mode, the pressure difference on both ends of the electric pump remains
constant, having nothing to do with flow. In Q/H figure, constant pressure curve is a level
performance curve, represented by HD1/HD2 (Section 9).
Position
System type
Settings of electric pump
Optimal settings
Or other optional
settings
A
Floor heating system
AUTO
HS3
B
Dual pipeline heating
system
AUTO
BL3
C
Single pipeline heating
system
AUTO
HS3

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7. PWM SIGNAL CONTROL MODE
7.1 Control and Signal
1) Control Principle
HST EPS series model pump is controlled by modulated LV PWM (Pulse Width Modulation)
digital signal, which means that the variance of velocity depends on the external input signal.
The variance of velocity is one of the functions of input control.
2) Digital LV PWM (Pulse Width Modulation) Signal
Design frequency scope of square wave PWM signal: 100Hz～2000Hz; PWM input signal
(PWM IN) is used to give velocity commands, and adjusts the velocity commands through
adjusting PWM duty cycle. PWM output signal (PWM OUT) is the feedback signal of the
pump, and the PWM frequency is fixed at 75Hz±5%
3) Duty Cycle（d%）
d％=t/T
For example：
T = 2 ms（500Hz）
t = 0.6 ms
d%=100×0.6/2=30
U = 7～15V ich
U ≤ 1V iL
I ≤ 10mA
Code
Descriptions
T
Cycle
D
Duty Cycle
UiH
Input High Voltage
UiL
Input Low Voltage
IiH
Input Current
7.2 Interface
The pump is controlled by external electrical
elements and components through interfaces. The
interfaces convert external signals into signals that
can be recognized by microprocessor in the pump.
In addition, when the pump is supplied with 230V
voltage, the interfaces can ensure that users will not
be at risk of high voltage electric shock when
contacting the signal cable.
“Signal Ref” is a reference earthing, and it is not connected to protective earthing
Note

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7.3 PWM Input Signal
•In area of high duty-cycle PWM signal, when the input signal fluctuates in the critical point,
there will be a delay area to prevent frequent stop and start of the pump.
•In area of low duty-cycle PWM signal, the pump runs at high velocity for the sake of system
safety. For instance, when the signal cable of gas boiler system is damaged, the pump will
continue to run at the maximum rotational speed and transfer heat through main heat
exchanger. This is also applicable to heat pump, ensuring continuous heat transfer in the
case of signal cable of pump is damaged and system safety is guaranteed.
•When PWM input signal is 0% or 100%, the pump will switch to non-PWM mode (normal
mode), and the default system will have no PWM signal input.
PWM Input Signal (%)
Pump Status
0
The pump switches to non-PWM mode (normal mode), and the
default system will have no PWM signal input.
<10
The pump runs at the highest velocity
10～84
The pump curve will drop from the highest to the lowest
85～91
The pump runs at the lowest velocity
91～95
If the velocity variance point of input signal fluctuates, then it will
block the start and stop of the pump according to the principle of
magnetic hysteresis
96～99
Stand-by, the pump stops
100
The pump switches to non-PWM mode (normal mode) and the
default system will have no PWM signal input.
This System is adaptive to the automatic switching of PWM and non-PWM mode.
When there is PWM signal input, the system will enter PWM mode.
Note

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7.4 PWM Feedback Signal
PWM feedback signal can provide operation status of the pump, such as power loss or all kinds of
alarm/warning modes.
PWM feedback signal will feed back exclusive alarming information. If the power voltage detects
under voltage signal values, its output signal will be set to 75%. Provided sundries settlement exists
in the hydraulic system and causes rotor being blocked, the duty cycle of output signal is set to
90%, the alarm will be given higher priority.
PWM Output
Signal (%)
95
Standby (stop)
The pump stops
90
Alarm stops,
malfunctions (pump blocked)
The pump does not work and will
restarts only after trouble is
addressed
85
Alarm stops,
electrical malfunction/trouble
The pump does not work and will
restarts only after trouble is
addressed
75
Warning
The pump runs, trouble has been
detected under this situation but it
is not critical, and the pump can still
work.
0-70
0-70W（slope 1 W/% PWM）
7.5 How to use the signals
The signal can be used to measure power consumption of the pump. The pump signal can be used
to detect the actual operating point of the system rather than measuring by the current controlled
by the system. The signal is also applicable to comparing velocity setting value and feedback.

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8. BYPASS VALVE SYSTEM (FITTED BETWEEN
INLET PIPELINE AND RETURN PIPELINE)
8.1 Use of bypass valve
Bypass valve
The role of bypass valve is: when all the valves in the floor heating circuit or the temperature
control valve of radiator are closed, it can be ensured that the heat from the boiler will be
assigned.
System components:
1. Bypass valve
2. Flowmeter, position L.
The minimum flow must be ensured when all valves are closed.
Water pump settings depend on the type of bypass valve it equipped with, i.e. manually-
operated bypass valve or temperature-controlled bypass valve.
8.2 Manually-operated bypass valve
Follow the following steps:
1. When adjusting the bypass valve, the water pump should be in setting HS1 (constant
speed gear I mode). The minimum flow of system (Q min) must always be ensured. See
the manual of bypass valve manufacturer.
2. When the bypass valve has been adjusted, set the water pump referring to Section 10.1
Pump Setting.