MYPV AC ELWA 2 Hot Water Heater Instruction Manual

: June 12, 2024
: MYPV

MYPV AC ELWA 2 Hot Water Heater Instruction Manual

Intended use

The AC ELWA 2 is intended for stationary installation in hotwater boilers or buffer storage tanks. The device takes linearly regulated power from the house mains according to external control signals.

Any application other than those described above may cause damage. Furthermare, this maylead to hazards such as a short circui, fire, electric shock, etc. The safety instructions and the information on handiing in this manual and in the operation instructions shall be followed!

You will find a comprehensive description of the unit’s functions and potential settings using the display or via web interface in the online Operating instructions [reference on the title page).

Scope of supply

Electric water heater AC ELWA 2 (three-part)
- Beectronic unit (incl. dummy plug for AUX relay connector)
- Heating rod incl. plug 6-pole, O-ring seal and temperature sensor T1 (in heating element)
- Connecting frame and fixing screw (Torx TX2O 4x25mm)
Accessory box
- Antirotation screw (Torx TX20 4.8¢13mm)
- Plug 3pole (L PE N for power supply incl. strin relief (2 parte) and fixing screw (Torx TX10 3x8mm)
- Plug 3-pols (NO COM NC) for AUX relay incl. strein relief (2 parte) and fixing screw (Torx TX10
- 3x8mm) External temperature sensor T2 (cable length 57)
- 8pole plug WiFi antenna 120 Ohm resistor for RS485 communication
- Operator stylus for the display o Holder for operator stylus
Assembly instructions
Quickstart guide
Give Avay

Safety instructions

The electrical connection, commissioning and service wark may only be performed by an authorized specialist.

When installing and connecting the relevant standards must be observed.

The electronic unit may only be connected to the enclosed heating rod from my- PV. Other heating rods (except those expresaly approved by my PV are not permitted!

A permanent earthing of the hot water tank is mandatory.

Never switch the unit an when the heating element is nat surrounded and caoled by water.

The housing must not: get damp or wet, it is only suitable for dry indoor areas. There s a risk of fatal electric shock!

Installation in rooms with a high level of humidity must comply with relevant. regulations!

Do not install device in ammonia-contaminated environments.

Do ot install in dusty environment:

The ventilation holes of the housing must not be covered

The housing of the device may heat up during operation.

Avoid exposure to intense het, cold or direct sunlight during storage and operation. See technical data

The safety temperature limiter (STL) responds at approx. 100°C and switches off the device. Caution when used in unpressurized storage tanks!

Do not reset the safety temperature limiter (STL) until the cause of the trip has been eliminated.

Before carrying out any work, the device must be disconnected from the power supply.

The plug of the power supply (L PE N) mus never be disconnected under voltage!

fosay relay is a potentialfree switching contact for safety extraow voltage. Do not connect: mains voltage under any circumstances. There is a danger to life!

The maximum operating pressure is 10 bar.

In commercial institutions, the accident prevention regulations of the professional associations must be observed for electrical systems and equipment.

This unit can be used by children ages 8 and persons with reduced physical, sensory or mental capabilies or lack of experience and knowledge if they have been given supervision or instruction concerning the safe use of the equipment and understand the resulting risks. Children should not play with the appliance. Cleaning and user maintenance shall not: be undertaken by children without supervision.

Liability and warranty exclusion

Alibility and warranty exclusion applies to

Damage to property or personal injury caused by improper handling or non-observance of the safety instruction and the service assembly and opportunity instruction.
Conequentiel demagee. Unauthorized remodeling, disassembly or other interventions in the device, madification of the product.
Damage caused by calcium deposits on heating element.
Damage caused by corrosion at heating element.

Connections

Overview

Electronic unic 1
Mains connection for power supply from the electric cabinet
AUX relay: 16A switching output for external heating element (max. 3 kW), Closed with dummy plug on delivery.
SELV relay: potentiatfree switching contact for safety extralow voltage AN
comnect mains voltage under any circumstances. There is a danger to lifet
External temperature sensor T2 (Polarity does not matter] PWM In/O1t, Ground/ Earth
Modbus RTU connection (RS485] LAN connection (RJ45) for network cable
Connection for Wii antenna
Fixing screw (Torx TX20 4x25mm) for fixing the electronics unit to the
connecting frame 1 Connecting frame between electronic unit and heating rod

System overview (on-grid systems)

System overview

Optional signal sources

my-PV WiFi Meter Instructions can be found here

Compatible manufacturers Instructions can be found here

Other signal source

For control by freely programmable energy management or smart home systems, a description of the open protocols Modbus TGP and http is availsble in a separate document. Thz connection to the signal source is made via LAN or WiFi. The description will be provided on request. Please contact my-PV for this purpose SUPPOrt@MY-pv.com

Via RS485, the AC ELWA 2 can only be used as @ Modbus RTU master. Freely programmable control is not possible with this,

Higher-level controllers can also specify the power output via @ PWM signal. The corresponding signal input is located on the B-pin connector to which the T2 temperature sensor is also connected

In oftgrid systems, the power can also be specified via the AC frequency. Addtional cabling for communication is not required in this case.

Communication Interfaces

LAN

WiFi
For a more stable communication with the signal source, my-PV recommends a LAN connection over a WiFi connection!
Communication Interfaces

TIP: To amplify the signal use commercially available Wii repeaters.
RS485
Communication Interfaces

PWM
Communication Interfaces

Assembly

A brief video (German with subtitles) to explain assembly will also be found nere: https://youtu.be/ET7DRIPHDE

Assembly of the heating rod

The hot water storage tank must be drained properly before instaling the heating rod.

The installation position of the unit (heating rod horizontal, electrical connections at the bottom) must be observed.

A socket of suitable thread size (G 1Y) must be available or mounting is done with locknut, which is not included in the scope of delivery.

The unheated zone of the heating rod is 140 mm from the sealing surface. Make sure that the length of the screwin slesve is shorter.

The pre-assembled G-ring seal has to be used. t must not be treated with lubricants. Make sure that the O- ring is properly placed in its groove.
Assembly Instruction
If the sealing with the Q-ring is not possible, other sealants may be used on tre thread.

Do not apply force when screwing in the heating rod until the seal is slightly pressed. Then tighten the heating rod with a 60mm spanner. When using a pipe wrench, include a cloth to protect the hexagon!

The tightening torque must not exceed 50 Nm

TIP: This corresponds to a weight of 5 kg with a lever length of one meter, or & weight of
10 kg with a lever length of half a moter.

If an adapter flange is used on the tank, we recommend a fiange plate made of stainless steel or at least of &n enamelled material. Otherwise corrosion could occur on the heating elements, but this is excluded from the warranty.

When refilling the water tank ensure that the heating elements are completely surrounded by water. Subsequently, the tank must be checked for leakage:

Putting on the electronic unit

First the anti-rotation screw (Torx TX20 4.8x13mm) must be screwed on. There are two SCrewsin points to choose from. Choose the position that allows the connecting frame to be aligned vertically afterwards (fising screw for electronic unit &t the bottom).

Assembly Instruction

Hook in the black connecting frame. To do this, hold the frame vertically (fxing screw for electronic unit at the bottom) and push it onto the mounting ring of the heating rod from top to bottom until it snaps into place.
Assembly Instruction

Establish electrical connections between the heating rod and the electronics unit. Start with the 3-pin temperature sensor T1
Assembly Instruction

Then plug in the B-pin heating rod connection until it snaps into place
Assembly Instruction

Arrange the wirehang the electronic the from bottom top,
Assembly Instruction

Screw the electronics unit to the connection frame using the fixing screw (Torx TX20 4x25mm).

TIP: For easier access, the electronic unit can be turned to the side until it hits the antirotation screw. Don’t use violence!

Electrical connection

The AC ELWA 2 must be connected to a nominal voltage of 230 VAC, 4565 Hz.

The conductor cross-sections at the mains connection must be at least 2.5 mm?.

The mains connection fuse for the AC ELWA 2 must not exceed 1BA (tripping characteristic B,

No other loads may be connected to the circuit, otherwise the maximum power of the AG ELWA 2 must bs
throttled (see online operating instructions Settings)!

The PE concuctor of the socket must be connected!

Slide the black plastic nut of the strain relief onto the onsite mains cable (note the direction). Strip the wires and connect them to the screw terminels (torque 0.4 Nm) sccording to the lsbeling on the 3-pin plug (L PE N).

Stripping: outer cable 30mm, wires 7mm.
With fine-stranded wires, we recommend the use of ferrules
Assembly Instruction

Put the strain over the plug and fix it with the black plastic nut.
Assembly Instruction

Check tightness. Then mount the cable with the strain relief by using the fixing screw (Torx TX10 3x8mm) on the mains supply connection (L PE NJ of the electronics unit;

A protective earthing conductor test must be carried out between the bare aluminum surface on the underside in the area of the connections and PE! For example according to DIN ENS0899

Caution when electrically conductor test must be carried out between the bare several devices Al devices should be connected to appropriate AC circuits. Note that each AC ELWA 2 takes up to 3.5 kW power. It makes sense to diide this between the phases on the grid,

Connection of temperature sensor T2 to the 8-pin connector

Assembly Instruction

Connect temperature sensor T2 to the 8-pin plug (polarity does not mateer). Ensure that terminal points 3 and 4 are correctly assigned!

The further wiring

Depending on the type of communication with the signal source and the operating mode, further connection can be found in the respective wiring diagrams

Application example: The B-pin plug with temperature sensor T2 and & network cable are connected. Then the cables are arranged and the device is aligned vertically
Assembly Instruction

Wiring diagram Mode M1: Hotwater 3’5 kW

Wiring Diagram

In any case, the temperature sensor T2 (optional) must be attached to the storage tank above the heatng rod in order to deliver a usable measurement result!

Do not immerse the temperature sensor T2 directly in water. Use immersion sleeve!

Terminal assignment

Wiring Diagram

Wiring diagram Mode M3: Hotwater 3,5 + 3 kW

Wiring Diagram

The temperature sensor T2 is always required in this operating mode and must be attached to the
storage tank above the upper heating rod in order to deliver a usable measurement result!

Do not. immerse the temperatire sensar T2 dinectly in water. |se immersion sleevel

the output of the external heating element must not be greater than 3 KW. The heating element must be installed with & separate fuse!

party control types may not be able to command the power up to 6.5 KW!

Terminal assignment

For correct function, the COM port of the AUX relay must be connected to phese!
Wiring Diagram

Remove the dummy plug from the AUX relay connector (NO COM NC).

Push the black plastic nut of the strain relief over an on-site two-pole cable (note the direction).

Strip the two wires and connect them to the COM and NO terminal points of the 3pin connector for the

AUX relay (torque 0.4 Nm).

Make the connection to the upper heating element via a screwed terminal box (on-site, see terminal assignment).
Assembly Instruction

Put the strein relief over the plug and fix it with the black plastic nut. Check tightness.
Assembly Instruction

Then connect the strain relief with the fixing screw (Torx TX10 3x8mm] ta the AUX relay (NO COM NC] of the electronics unit.

Maintenance

Du ol alleript W oper the electronic uril. 1L dues nol conlain any perts Uisl may be repaired by Ue user.

Never aplash water on or in the unit!

When it is unplugged, the surface of the unit can be cleaned either with a damp cloth, using mild glass cleaner or cleaning tissue for glasses.

In & polluted environment;, the air inlets and outlets should be checked regularly for cleanliness. If necessary, the unit can be cleaned through the air slots with a vacuum cleaner.

The it canno work et mesimum efficiency if the air supply is inadequate!

Calciferous water can cause calcification of the heating rod. When in contact with drinking water, we therefore recommend setting & target temperature of max 60°C! We recommend an annual review. To do this, dismantle the heating rod from the storage tank and remove limescale. Do not scratch the surface of the heating element (formation of corrosion).

Operation displays

The unit has a touch screen to show operating conditions and for ease of operation

Never touch the screen with pointed objects or those having sharp edges!

For hest. use the supplied nperator stylus. The holder for the styius can be stuck close t0 the unit with the adhesive patch,
Assembly Instruction

You will find a comprehensive deseription of the unit’s functions and potential settings using the display or via web interface in the online Operating instructions (reference on the tile page).

Troubleshooting

The device does not contain any parts that may be repaired by the user. In the event of a fault, please contact your specialist dealer or supportemypv.com.

Disposal

Packaging material must be either stored or disposed of as appropriate. Dispose of the product at the end of ts service life according to the statutory regulations,

EU declaration of conformity

You can find them et any time on www.my-pv.com

Technical specifications

Heating power	0-3,500 W + relay output 16 A
Fuse protection	13 A or 16 A
Mains connection	3-pole terminal, 2.5 mm2 230 V, 45 – 65 Hz
Self-consumption	< 1,5 W
Efficiency	> 99,3 % at nominal power
Cos Phi	0,999 at nominal power
Certification	CE, TOR D1, TAEV, TAB
Mains-side THDi	At 50 %power < 3 %; at 100 % power < 3 %
Display	Color Graphic, Touch Screen 2,83″
Communication	Ethernet RJ45,Wifi, R5485, PWM-in 3 – 24V 100 Hz – 1 kHz,