STIEBEL ELTRON IM 45 EC Bedienungsanleitung

Service Manual

IM_EC

Author: Mr. Apiwat Limrueangwattanakul

Date: MAY 2015

Revision: version 0

Table of Contents

Warning.......................................................................................................................................................... 3

General product information......................................................................................................................... 4

Technical data ................................................................................................................................................ 5

Wiring Diagram ...............................................................................................................................................

Troubleshooting..............................................................................................................................................

Root clause analysis ........................................................................................................................................

1. Heating Elements checking.................................................................................................................

2. TRIAC checking.................................................................................................................................. 

3. Flow Switch checking ........................................................................................................................ 

4. Control PCB checking ........................................................................................................................ 

5. Thermostat checking......................................................................................................................... 

6. ELCB checking.................................................................................................................................... 

7. ELCB function testing ........................................................................................................................ 

8. System comfirm ................................................................................................................................ 

Warning

Warning: This service manual is suitable for qualified Technicians only.

Warning: Disconnect power supply before open cover.

General product information

The STIEBEL ELTRON IM flow-controlled, pressurized instantaneous water heater heats the water

while it is flowing through the unit. The heating power is switched on automatically in the event of the



Technical data

Model

IM 45EC

IM 60EC

IM 80EC

Type

Closed outlet

Min. inlet water pressure MPa(bar)

0.015(0.15)

0.02(0.2)

0.03(0.3)

Max. inlet water pressure MPa(bar)

1(10)

Water connection

G 1/2"

Electrical connection



220 V

4.5

6.0

8.0

230 V

4.9

6.6

8.7

240 V

5.4

7.1

9.5

Recommended cable size Sqmm.

2.5 - 4.0

4 6

6 8

Recommended circuit breaker A

Dimension (W x H x D) mm.

186 x 164 x 76

Wiring Diagram

Type DX…E

A = Heating element

B = Electronic control set (Phase Cut)

C = ELCB

D= Triac Set

E = Thermal cut - out (TCO)

Troubles shooting

- ELSD cut-off

- Check filter, and flow

rate

-Low flow

- No power supply to unit

- Power line not tight

- Check breaker

- Thermal cut-out (TCO)

- Check Triac set

- Check Reed switch

- Cleaning magnet

- Check PCB

- ELSD reset

- Check connecting

points and fix.

Power lamp not "ON"

and water not hot

- PCB failure

- Check PCB

- Missing water connection

- Check reed switch

- Reed switch failure

- Check Triac set

- Triac failure

Problem & Condition

Cause

Correction

- Reconnect inlet,

Power lamp "ON"

but water not hot

- Heating elements failure

- Check Heating

Power lamp not "ON"

but water Hot

- Lamp broken

- Lamp cable broken

- Check & change the Lamp

- Check & change Lamp

cable

Power lamp "ON" all the

time

- Reed switch failure

- Check reed switch

- Triac short circuit

- Check Triac set

Problem & Condition

Cause

Correction

- Overloaded current on main

breaker

- Power line wrong connection

- Turn off other appliance

- Reconnect power

- Water over flow

- Reduce water flow

Breaker cut-off

- Reed switch failure

Water temperature

not constant

- Change pump to

smooth pressure type

- Check reed switch

- Irregular water flow

- Triac failure

- Check Triac set

Water leak

- Wrong installation

- Reinstallation

- Connector has loosen

- Tight connectors

- PCB failure

- Check PCB

Power on maximum but

water not hot enough

Water too hot

Troubles shooting

Root clause analysis

1. Heating Elements Checking

Definition: Heating Element is a metal coil that heats up to high temperatures, when

electricity is applied. To check the Heating Element, follow the steps below:

- Disconnect cables from the Elements.

- Set Mu)))) "and check as show in the pictures.

Check

Meter Result

Cause

Action

Pole Pole

"Beep" signal or (~ 0 )

Element Pass

No action

No signal "OL" or (

Element Broken

Change New Heater

Pole GRD

"Beep" signal or (~ 0 )

Element short to tank

Change New Heater

No signal "OL" or (

Element Pass

No action

Remark: "OL" = Over Load for Digital Multimeter, "alog Multimeter

Pole - Tank (P1 - Tank), (P2 Tank) and (P3 Tank)

Tank

Pole Pole (P1 - P2), (P1 P3) and (P2 P3)

2. TRIAC Checking

Definition: The Triac is a three-terminal device, which controls and conducts current flow during

both alternations of an AC cycle. To check Single Triac, follow the steps below:

- Disconnect cables and unplug any connectors in red circle.

- )))) " and check as show in the pictures.

Note; L1 = line, H1 = Heater, GRD = Ground

Check

Meter Result

Cause

Action

L1 H1

"Beep" signal or (~ 0 )

Triac short circuit

Change new

No signal "OL" or (

Triac Pass

No action

Check

Meter Result

Cause

Action

L1 - GRD

"Beep" signal or (~ 0 )

Triac short circuit

Change New Triac PCB

No signal "OL" or (

Triac Pass

No action

H1- GRD

"Beep" signal or (~ 0 )

Triac short circuit

Change New Triac PCB

No signal "OL" or (

Triac Pass

No action

Remark: "OL" = Over Load for Digital multimeter, "ultimeter.

GRD

H1 - GRD

GRD

Pole Ground

(L1 GRD) &

(H1 GRD)

L1 - GRD

GRD

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