MYPV AC ELWA, PLA Installation And Operating Instructions Manual

AC ELWA

®

PV Excess-Energy Hot Water System

PLA

3-phase Meter/Controller

Installation and Operating Instructions

Intended Use

The electrical device PV excess-energy hot water system AC ELWA (referred to as AC ELWA) is intended for
stationary installation in hot water storage or buffer tank storage. The device is controlled by external control
signals and adjusts its heating power from zero to 3000 W accordingly.

You can use the AC ELWA also with Universal Interface!
The PLA Meter/Controller is incorporated in the power distribution immediately after utility meter fuses. It is
suitable for single-phase and three-phase systems. The neutral conductor shall be connected in any case.

Any other use than described above may damage the device, moreover, this involves dangers such as short
circuit, fire, electric shock, etc. The safety instructions and the information on handling in this manual and in
the application instructions shall be followed!
The product complies with the applicable National and European requirements. Company and product name
are trademarks of my PV GmbH. All rights reserved.

2

Delivery

• Electric photovoltaic excess-energy hot water system AC ELWA

• Connection plug for control cable connection between AC ELWA and PLA Meter/Controller

• IP21 cover

• Operating instructions

safety instructions

The installation must be carried out exclusively by the authorized expert.

When installing and connecting the relevant standards must be observed.

Warranty does not cover any damages caused by failure from disregarding these operating instructions.

A permanent earthing of the hot water tank is mandatory.

Never switch the unit on when the heating element is not surrounded and cooled by water.

The housing must not get damp or wet, it is only suitable for dry indoor areas. Danger of fatal electric shock!

Do not install device in ammonia-contaminated environments.

Do not install in dusty environment.

The ventilation holes of the housing don’t have to be closed.

Orientation of the device (horizontal heater, power cord below) must be maintained.

The PLA Meter/Controller must be mounted on a standard 35 mm DIN rail.

Avoid storage and operation temperatures > 40 ° C) and <5 ° C, do not expose to direct sunlight.

The AC ELWA must be connected to a nominal voltage of 230 VAC.

The circuit breaker of the grid connection for AC ELWA must be rated 13 A to 16 A, AC ELWA can be
adjusted accordingly.

The PLA Meter/Controller must be connected to 1 x 230 V AC or 3 x 230 VAC with Neutral. The allowed
fusing of the mains connection may be max. 65 A.

The safety thermostat responds to 98 +/- 3 ° C and the unit switches off permanently.

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 capabilities
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

A liability and warranty exclusion applies to:

 any damage or injury caused by improper handling or failure to observe the safety and operating
 consequential damages
 Unauthorized remodeling, disassembly or other interventions in the device, modification of the

product

 Damage caused by calcium deposits on heating element.

AC ELWA® Installation and Operating, Version 1.0, Date 2016-01-23 3

Installation of AC ELWA

The installation must be carried out exclusively by the authorized personnel.
The hot water storage tank must be drained properly before installing the AC ELWA.
AC ELWA is designed for horizontal installation in hot water tank with 1 ½ inch thread. The unheated zone of
the built-in heating element is 90 mm from sealing surface. The length of the mounting socket must not
exceed 90 mm. The pre-assembled O-ring seal has to be used; it must not be treated with lubricants. The
plastic thread must not be sealed with hemp or other sealants.
During mounting you have to screw without any effort until the seal rests lightly. Make sure that the O-ring is
clean in the groove of the plastic part. Tighten the heater with a spanner nominal width 60 mm. The
tightening torque must not exceed 80 Nm.

In no case the heater may be tightened by turning the metal case!

If the device does not stand up straight (power cord down) after tightening, it can easily be turned to the left
or right for about 180 °.
Then tighten the 4 lock nuts of the mounting plate of the heater to fix the unit in its straight position:

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

After mounting the supplied IP21 cover is to be attached!

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Electrical connection scheme

Electrical connection AC ELWA

To ensure proper operation of the control line to PLA (data modulation), the AC ELWA has to be connected
with the correct polarity at the socket.
The power plug is marked with "N". The "N" side of the plug must be connected to the "N" pole of the socket
(check with voltage meter).
AC ELWA has to be connected to a 13 or 16A circuit breaker socket.

The PE conductor of the socket must be present!

Pay attention to other loads on the line circuit, this may trip the circuit breaker!

Electrical connection PLA

Remove the fuses after the utility meter before connecting.

There are at least one phase (single – phase at utility meter) and the neutral conductor to connect.

Observe local regulations!