Multi 55N - Pump ESPA - Free user manual and instructions

Product type	Vertical multistage centrifugal pump
Brand	ESPA
Model	Multi 55N
Category	Pump
Dimensions (L × W × H)	531 × 184 × 245 mm
Weight	25.7 kg
Power supply	Single-phase 220 V / Three-phase 380 V (depending on version)
Absorbed power (P1)	2.1 kW
Nominal current (single/three)	9.6 A / 6.6 A
Capacitor	30 μF
Max flow	333 l/min
Max head	38 m
Max working pressure	1.2 MPa
Max liquid temperature	40 °C
Ambient temperature	0 °C to 40 °C
Protection rating	IP55
Efficiency (η)	52 %
Minimum efficiency index (MEI)	≥ 0.40
Main functions	Pumping clean water, boosting, distribution, irrigation
Maintenance and cleaning	Clean with a damp cloth; drain pipes during freezing conditions
Safety	Thermal protection, 30 mA differential switch, mandatory earthing
Spare parts and repairability	Contact an ESPA Authorized Technical Service; www.espa.com
General information	Compliant with CE directives; continuous operation S1

Frequently Asked Questions - Multi 55N ESPA

What to do if the motor does not start?

First check the power supply and fuses. If the pump is blocked, disassemble it and contact an Authorized Technical Service. Ensure the voltage matches the rating plate.

The motor runs but pressure is insufficient. What to check?

Check that the total head does not exceed the pump's capabilities. Also verify no leaks on connections and that the foot valve is not clogged.

How to prime the pump correctly?

Fill the pump body through the filling plug until water overflows. If a foot valve is installed, also fill the suction pipe. Never run the pump dry.

Why is the flow insufficient?

Possible causes include worn impellers, too high suction lift, air ingress in connections, or a foot valve not submerged. Check each point and correct.

The motor overheats abnormally. What are the causes?

This may be due to poor ventilation of the room, incorrect voltage, or operation outside performance limits. Ensure sufficient ventilation and check the voltage.

How to maintain the pump?

Under normal conditions, no special maintenance is required. Clean the exterior with a damp cloth without harsh products. In case of frost or prolonged inactivity, drain the pipes and store the pump in a dry place.

What electrical safety precautions must be observed?

Install a high-sensitivity differential switch (30 mA) and an omnipolar switch with contact opening of at least 3 mm. Earthing is mandatory. Call a certified installer.

The pump stops and restarts by itself. What to do?

This indicates klixon activation (thermal protection). Check that the motor is not overloaded, voltage is correct, and operating conditions (flow, head) are within limits shown on the plate.

How to check the rotation direction on a three-phase pump?

The rotation direction must be clockwise viewed from the fan side. If flow is low, swap two phases in the connection box.

Where to find spare parts and after-sales service?

Contact an ESPA Authorized Technical Service. The list is available at www.espa.com. Do not handle the pump yourself in case of failure.

USER MANUAL Multi 55N ESPA

Technical line drawing of a mechanical pump or motor assembly (no text or symbols visible)

EN Instruction manual.... 10 (Translation from the original Spanish)

EN: EVIDENCE OF CONFORMITY

We declare, under our responsibility, that the products in this manual comply with the following directives and standards:

• Directive 2006/42/EC (Machine Security): Standard EN 809 and EN 60204-1
• Directive EMC 2014/30/EU (Electromagnetic compatibility): Standard EN 61000-6-1 y EN 61000-6-3
• Directive 2014/35/EU (Low voltage): Standard EN 60335-1 and EN 60335-2-41
• Directive 2009/125/EC (ecological design): Regulation (EU) 2019/1781 electrical motors and variable speed drives. Standard EN 60034-30. Regulation 547/2012 for Hydraulic pumps. Standard EN 16480
• Directive 2012/19/EU (on waste electrical and electronic equipment (WEEE)): Standard EN 50419:2006 about marking of electrical and electronic equipment.
• Directive 2011/65/UE (Restriction of hazardous sustances): Standard EN 50581.

FR : DECLARATION DE CONFORMITÉ

EVIDENCE OF CONFORMITY

We declare, under our responsibility, that the products in this manual comply with the following directives and standards:

• Supply of Machinery (Safety) Regulations 2008: Standard BS 809 and BS 60204-1
• Electromagnetic Compatibility Regulations 2016: Standard BS 61000-6-1 and BS 61000-6-3.
• Electrical Equipment (Safety) Regulations 2016: Standard BS 60335-1 and BS 60335-2-41.
• The Ecodesign for Energy-Related Products and Energy Information (Amendment) (EU Exit) Regulations 2019: Standard BS 60034-30.
• The Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2012. Standard BS 50581.

Banyoles, January 7th 2021

Josep Unyó (Technical Manager)

ESPA 2025, SL

Ctra. de Mieres, s/n – 17820 Banyoles

Girona - Spain

Damage prevention and safety instructions (See figure 4)

A	Warning! Observe limitations of use.
B	The name plate voltage must be the same as the mains voltage.
C	Connect the pump to the mains via an omnipolar switch with at least a 3 mm opening between contacts.Install a high-sensitivity differential switch (0.03A) as extra protection against lethal electric shocks.
D	If the supply cord is damaged, it must be replaced by an A.T.S.
E	Connect the pump to the ground.
F	Use pump only within performance limits indicated or the name plate.
G	Remember to prime pump.
H	Check for motor self-ventilation.
I	This apparatus may be used by children 8 years or older and persons with reduced physical, sensory or mental capacities, or lacking experience and knowledge, if they are supervised or receive adequate training on the safe use of the apparatus and understand the dangers.Children should not be allowed to play with the apparatus.Children should not perform the ordinary cleaning and maintenance tasks without supervision.
J	Be careful with hazardous liquids and environments.
K	Caution! Look out for accidental leaks.Do not expose pump to bad weather.
L	Caution! Avoid icing.Cut out power supply before servicing pump.

Contents

Safety precautions....10

1. General information....11
2. Handling....11
3. Installation ....11

3.1. Fixing....11
3.2. Suction pipe assembly .....11
3.3. Discharge pipe assembly .....11
3.4. Electrical connection .....12
3.5. Pre-start checks ..... 12

1. Starting 12
2. Maintenance 12
3. Disposing of the product....12
4. Nameplate 12
5. Possible faults, causes and solutions....13
6. Technical data ......13
7. List of main components....44
   11.Wiring diagrams....45
8. Illustrations....46

Safety precautions

This symbol together with one of the following words “Danger” or “Warning” indicates the risk level deriving from failure to observe the prescribed safety precautions:

DANGER risk of electric shock

Warns that failure to observe the pre cautions involves a risk of electric shock.

DANGER

Warns that failure to observe the pre cautions involves a risk of damage to persons and/or things.

WARNING

Warns that failure to observe the pre cautions involves the risk of damaging the pump and/or the facility

1. GENERAL INFORMATION

Please observe the following instructions to achieve the best pump performance possible and a trouble free installation.

Read these instructions before installing the pump.

Save them for future reference.

These are vertical multistage centrifugal pumps having more than one impeller assembled in-line. The same flow passes through each impeller but the pressure increases each time, i.e. more impellers, more pressure.

These pumps are designed to operate with clean water, free from particles in suspension and with a maximum temperature of 40 ^ .

Correct pump operation is assured providing the instructions on electrical connection, installation and use are strictly adhered to.

Failure to adhere to the instructions can result in premature failure of the pump and voiding of the warranty.

Minimum efficiency index

With the application of the European Regulation 547/2012, the minimum efficiency index after 01/01/2015 must be MEI ≥ 0.40.

The reference value for the most efficient hydraulic pumps is rated at MEI ≥ 0.70.

The performance curves and efficiency characteristics can be checked on the technical catalogues and on www.espa.com.

The operation of this hydraulic pump with variable operating points can be cheaper and more efficient when controlled with, for example, a speed regulation control that adjusts the pump's operation to the system performance.

The efficiency reference criteria can be found on the following link:

http://global.espa.com/doc-descarrega-1/fingerprints.pdf

2. HANDLING

The pumps are supplied suitably packaged to prevent damage in transit. Before unpacking, check that the packaging has not been damaged or deformed,

Lift and handle the product with care and with the right tools.

3. INSTALLATION

These pumps are designed for indoor use.

Make sure that pump is never submerged and that it rests in a dry and well aired room.

3.1. Fixing

The pump should be installed on a solid, horizontal base, secured by screws or bolts and using the existing holes in the mount.

3.2. Suction pipe assembly

The suction pipe, if longer than 7 meters, must be of the same or greater diameter than the pump inlet and installed in an upward inclination to prevent trapped air pockets forming.

If the pump is required to perform a suction lift, to avoid unnecessary losses of head on the discharge side, the pump should be installed as close as possible to the water.

The end of the suction pipe must always remain at least 30 cm below the water level. (Fig.3)

3.3. Discharge pipe assembly

It is recommended to use pipes with a diameter equal or greater than the pump outlet. This will reduce loss of head caused by friction in longer pipe runs.

Pipework must be supported and their weight must not rest on the pump.

If a foot valve has not been installed it is recommended to fit a check valve to prevent accidental draining down of the system.

3.4. Electrical connection

The electrical installation must have a multi-pole isolator with minimum 3 mm contact openings. The protection of the system will be based on a differential switch ( fn = 30 mA )

The power cable must correspond at least to the type H05 RN-F (according to 60245 IEC 57) and having terminals.

The connection and its dimensioning must be performed by a qualified installer according to the needs of the facility and following the regulations in force in each country.

Pump models 25: Single-phase motors have thermal protection.

The rest of the pump models with single phase motor and all three phase motor pumps do not incorporate this protection. They must be connected to a motor-protective circuit breaker that can be adjusted manually. Set the circuit breaker according to the current given in the rating plate plus 10%.

Follow instructions given on fig.1 for correct electrical connection.

3.5. Pre-start checks

Ensure the voltage and frequency of the supply corresponds to the values indicated on the electrical data label.

Ensure that the pump shaft is rotating freely.

Fill the pump body with water through the self-priming plug opening. If a foot valve has been installed, also fill the suction pipe.

Check all joints and connections for leaks.

THIS PUMP MUST NEVER BE DRY RUN.

4. STARTING

Ensure all valves in the pipework are open.

Connect power supply. There will be a delay before water appears at the end of the discharge pipe.

Viewings from the fan ensure that the rotation of the motor is clockwise. On three phase pumps the motor may rotate anticlockwise. If this is happening, the flow will be lower than expected. To rectify this situation the two supply phases need to be reversed.

Ensure that the absorbed current is the same or lower than the maximum shown on the name plate. Adjust the thermal relay if is necessary.

If the pump fails to operate refer to the possible faults, causes and solutions list for assistance.

5. MAINTENANCE

Under normal conditions these pumps require no special or planned maintenance.

Clean the pump with a damp cloth without using harsh products.

If the pump is not to be operated for a long period it is recommended to remove it from the installation, drain down and store in a dry, well ventilated place.

ATTENTION: In the event of faults or damage occurring to the pump, repairs should only be carried out by an authorised service agent.

The Official Technical Services list is in www.espa.com.

6. DISPOSING OF THE PRODUCT

When the pump is eventually disposed of, please note that it contains no toxic or polluting material. All main components are material identified to allow selective disposal.

This product or parts of it must be disposed of in an environmentally sound way, use the waste collection service. If this is not possible, contact the nearest ESPA service workshop.

1. PLATE SHOWING CHARACTERISTICS
   

MULTI35 5 N 230/400 50 1200/STD Q(l/min): 33-165 Hmin: 22m Tmax: 40°C H(m): 65-22 Hmax: 70m P2: 1.5kW Δ230V/Y400V 3~50Hz I:6.9/4A P1: 2.2kW 1.5kW IE2 - 83% IP-55 MEI ≥ 0,40 (η = -.) ESPA 2025 S.L. 17820 Banyoles (MADE IN SPAIN) Is.KL.F S1 DESCRIPTION

1	Item reference
2	Voltage + frequency + item specifications
3	Flow
4	Pressure
5	Nominal voltage, no. stages, alternate current symbol and frequency
6	Energy efficiency index (Three-phase model)
6	Capacitor (Single-phase model)
7	EC mark
8	Humidity protection level
9	Minimum working pressure
10	Maximum pressure
11	Year and week of manufacture + Pump serial number
12	Max. liquid temperature
13	Motor max. nominal output (P2)
14	Electric pump unit absorbed power (P1)
15	Minimum Efficiency Index
16	Designated motor insulation
17	Continuous operation symbol
18	Maximum nominal intensity at nominal voltage
19	Name and address of vendor responsible for the product

8. POSSIBLE FAULTS, CAUSES AND SOLUTIONS

1) The motor does not start.
2) Motor operates but there is no pressure.
3) Motor over-heating.
4) Pump does not deliver rated capacity.
5) Motor starts and stops automatically.
6) Shaft rotates with difficulty.

1	2	3	4	5	6	POSSIBLE PROBLEM	SOLUTIONS
X				X		Pump blocked	Disconnect it and take it to the official Technical Service
			X			Foot valve clogged	Clean it or replaced by new one
	X		X			Total head higher than expected	Verify geometric head and loss of head
X		X		X		Wrong tension	Check that the tension is the same as that on the name plate
	X		X			Water level in well or tank has come down	Verify suction head
X						Fuse or thermal relay disconnected	Change fuse or thermal relay
	X		X			Impellers are worn out	Disconnect pump and take it to your Service Dealer
	X					Foot valve not submerged	Be sure suction pipe is submerged
	X					Pump was not primed	Fill pump body with water
		X		X		Room not properly aired	Provide good ventilation
	X					Air entry	Seal unions and joints properly

9. TECHNICAL DATA

Liquid temperature... 4°C - 40°C

Ambient temperature: 0°C - 40°C

Storage temperature: -10°C - 50°C

Ambient relative humidity, max.: 95%

Motor class I.

Other data see Figure 2.

6. AFVOEREN VAN HET PRODUCT

EN List of main components

Technical schematic diagram of a mechanical device with numbered components for identification.

	ES	EN	FR	DE	IT
1	Tapa ventilador	Fan cover	Capot ventilateur	Lüfterhaube	Cuffia ventola
2	Ventilador	Fan	Ventilateur	Lüfterrad	Ventola
3	Rodamiento	Bearing	Roulement	Wälzlager	Cuscinetto
4	Estátor	Stator	Stator	Ständer	Statore
5	Eje motor	Motor axle	Axe moteur	Motorwelle	Asse del motore
6	Rodamiento	Bearing	Roulement	Wälzlager	Cuscinetto
7	Cuerpo impulsión	Delivery body	Corps de refoulement	Drukgehäuse	Corpo premente
8	Retén mecánico	Mechanical seal	Garniture mécanique	Rückhalter	Tenuta meccanica
9	Tapón cebado	Priming plug	Bouchon de remplissage	Einfüllstopfen	Tappo di riempimento
10	Rodete	Impeller connector	Roue	Läufer	Girante
11	Difusor	Diffuser	Diffuseur	Diffusor	Diffusore
12	Cuerpo aspiración	Suction body	Corps d'aspiration	Saugehäuse	Corpo di aspirazione

Z X Y U V W

400V

Z X Y U V W

230V

Fig. 2 / Abb. 2 / Afb. 2 / Puc. 2 / 图 2 / 2

F E A C D B E

A B C D E F G H I J K L

ESPA 2025, S.L.

C/ Mieres, s/n - 17820 BANYOLES

GIRONA – SPAIN

www.espa.com

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