A.O. Smith ADM - 115 User Manual

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12Performing maintenance

12.1 Introduction

12.2Preparation for maintenance

Caution

Maintenance may only by carried out by an approved service and maintenance engineer.

At each service, the appliance undergoes maintenance on both the water side and the gas side. The maintenance must be carried out in the following order.

1.Water-side maintenance

2.Water-side maintenance

3.Gas-side maintenance

4.Finalising maintenance

Note

Before ordering spare parts, it is important to write down the appliance type and model, and the full serial number of the appliance. These details can be found on the rating plate. Only by ordering with this information can you be sure to receive the correct spare parts.

To test whether all components are still working properly, complete the following steps:

1.Set the ON/OFF switch on the control panel to position 0.

2.Set the control thermostat to the highest value (note the original setting) and set the ON/OFF switch back again to position I.

3.If there is no heat demand, draw off some water to create a heat demand.

4.Check whether the heating cycle (9.3 "The appliance's heating cycle") runs correctly.

5.Set the control thermostat back to the original setting and set the ON/OFF switch back again to position I.

6.Check the supply and burner pressure (3.11 "Checking the supply pressure and burner pressure"), and adjust them if necessary.

7.Check that all components of the chimney flue system are properly attached.

8.Test the operation of the overflow valve of the protected cold supply set-up.The water should spurt out.

9.Test the overflow operation of the T&P valve. The water should spurt out.

10.Test the overflow operation of the T&P valve. The water should spurt out with a strong jet.

11.Check the drainpipes from the discharge points of all valves and remove any scale deposits that may be present.

12.Drain the appliance (6 "Draining").

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12

 

Performing maintenance

 

 

12.3Water-sidemaintenance

s

12.3.1Introduction

The following steps must be carried out on the water side:

1.Checking the anodes.

2.Descaling and cleaning the tank.

12.3.2Checking the anodes

Timely replacement of the anodes extends the service life of the appliance. The appliance's anodes must be replaced as soon as they are 60% or more consumed (take this into consideration when determining the maintenance frequency).

Warning

The draught diverter and the cover may be hot.

1.Remove the protective cover from the control column by unscrewing the 4 screws in the cover.

2.Detach the wiring for the flue gas thermostat from the connector block and remove the cable from the strain relief.

3.Remove the cable clamps holding the flue gas thermostat cable.

4.Disconnect the draught diverter from the flue gas discharge.

5.Undo the screws on the draught diverter.

6.Remove the draught diverter from the appliance.

7.Undo the screws of the lid in the top side of the appliance.

8.Remove the lid from the appliance.

9.Remove the sealing ring from the appliance.

10.Loosen the anodes using suitable tools.

11.Check the anodes, and replace them if necessary.

12.Now also check the flue baffles (12.4.4 "Checking the flue baffles"). If necessary, replace them.

13.Place a new sealing ring on the rim of the tank and re-fitthe lid.

14.Fit the draught diverter (3.9.2 "Fitting the draught diverter").

15.Feed the cable of the flue gas thermostat through the strain relief and attach the wiring to the connector block (14.2 "Electrical Diagrams ADM").

16.Refit the cable clamps to the appliance and draught diverter.

17.Re-fitthe protective cover.

12.3.3Descaling and cleaning the tank

Scale and lime buildup prevent effective conduction of the heat to the water. Periodic cleaning and descaling prevents buildup of these deposits. This increases the service life of the appliance, and also improves the heating process.

Take the rate of scale formation into account when deciding on maintenance frequency. Scale formation depends on the local water composition, the water consumption and the water temperature setting. A water temperature setting of maximum 60°C is recommended for prevention of excessive scale buildup.

To ensure the perfectly watertight sealing of a cleaning opening, the gasket (6), O-ring(7), sealing rings (4), bolts (3) and possibly the lid (5) should be replaced with new components after opening (see the figure). A special set is obtainable from the supplier/manufacturer.

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To simplify the task of descaling and cleaning the tank, the appliance is equipped with two cleaning openings.

1

2

5

6

7

3

4

IMD-0235R2

1.Remove the cover plate (1) on the outer jacket (see the figure).

2.Carefully remove the insulation layer (2) and set it to one side. This will be needed again later.

3.Undo the bolts.

4.Remove the lid, the gasket and the O-ring.

5.Inspect the tank and remove the loose scale deposits and contamination.

6.If the scale cannot be removed by hand, descale the appliance with a descaling agent. Contact the supplier/manufacturer for advice on what descaling agent to use.

 

1

5

3

4

6

 

2

IMD-0282R1

7.Close the cleaning opening. To avoid damage to the tank, tighten the bolts that fasten the lid with a torque no greater than 50 Nm. Use suitable tools for this. For the best possible watertight seal of the cleaning opening, the bolts in the lid should be torqued down in the sequence shown in the figure.

12.4Gas-sidemaintenance

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12

 

Performing maintenance

 

 

12.4.1Introduction

s

12.5Finalising maintenance

The following steps must be carried out on the gas side:

1.Clean the burner(s).

2.Clean the orifice(s).

3.Checking the flue baffles.

12.4.2Clean the burner(s)

1.Detach the burner(s)

2.Remove all contamination present on the burner(s).

3.Fit the burner(s)

12.4.3Clean the orifice(s)

1.Detach the orifice(s)

2.Remove all contamination present in the orifice(s).

3.Fit the orifice(s)

12.4.4Checking the flue baffles

Warning

The flue baffles can be hot.

1.Remove the flue baffles from the appliance.

2.Check the flue baffles for the presence of corrosion, removing this if necessary.

3.Check the flue baffles for wear, and replace the flue baffles if necessary.

4.Place a new sealing ring on the rim of the tank and re-fitthe lid.

5.Fit the draught diverter (3.9.2 "Fitting the draught diverter").

6.Feed the cable of the flue gas thermostat through the strain relief and attach the wiring to the connector block (14.2 "Electrical Diagrams ADM").

7.Refit the cable clamps to the appliance and draught diverter.

8.Re-fitthe protective cover.

To finalise the maintenance, carry out the following steps:

1.Fill the appliance (5 "Filling").

2.Start the appliance (9 "Starting and running").

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13 Warranty (certificate)

 

 

To register your warranty, you should complete and return the enclosed

 

 

warranty card after which a warranty certificate will be sent to you. This

 

 

certificate gives the owner of a appliance supplied by A.O. Smith Water

 

 

Products Company B.V. of Veldhoven, The Netherlands (hereinafter "A.O.

 

 

Smith") the right to the warranty set out below, defining the commitments of A.O.

 

 

Smith to the owner.

13.1

General warranty

If within one year of the original installation date of a water heater supplied by

 

 

A.O. Smith, following verification, and at the sole discretion of A.O. Smith, a

 

 

section or part (with exclusion of the tank) proves to be defective or fails to

 

 

function correctly due to manufacturing and/or material defects, then A.O. Smith

 

 

shall repair or replace this section or part.

13.2

Tank warranty

If within 3 years of the original installation date of a water heater supplied by

 

 

A.O. Smith, following inspection, and at the sole discretion of A.O. Smith, the

 

 

glass-linedsteel tank proves to be leaking due to rust or corrosion occurring on

 

 

the water side, then A.O. Smith shall offer to replace the defective water heater

with an entirely new water heater of equivalent size and quality. The warranty period given on the replacement water heater shall be equal to the remaining warranty period of the original water heater that was supplied. Notwithstanding that stated earlier in this article, in the event that unfiltered or softened water is used, or allowed to stand in the water heater, the warranty shall be reduced to one year from the original installation date.

13.3Conditions for Installation and use

The warranty set out in article 1 and 2 will apply solely under the following conditions:

a.The water heater is installed under strict adherence to A.O. Smith installation instructions for the specific model, and the relevant government and local authority installation and building codes, rules and regulations in force at the time of installation.

b.The water heater remains installed at the original site of installation.

c.The appliance is exclusively used with drinking water, which at all times can freely circulate (a separately installed heat exchanger is mandatory for heating salt water or corrosive water).

d.The tank is safeguarded against harmful scaling and lime buildup by means of periodic maintenance.

e.The water temperatures in the heater do not exceed the maximum setting of the thermostats, which form a part of the water heater.

f.The water pressure and/or heat load do not exceed the maximum values stated on the water heater rating plate.

g.The water heater is installed in a non-corrosiveatmosphere or environment.

h.The water heater is connected to a protected cold supply arrangement, which is: approved by the relevant authority; with sufficient capacity for this purpose; supplying a pressure no greater than the working pressure stated on the water heater; and where applicable by a likewise approved temperature and pressure relief valve, fitted in accordance with installation instructions of A.O. Smith applying to the specific model of water heater, and further in compliance with the government and local authority installation and building codes, rules and regulations.

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13

 

Warranty (certificate)

 

 

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13.4 Exclusions

13.5Scope of the warranty

13.6Claims

13.7Obligations of A.O. Smith

i.The appliance is at all times fitted with cathodic protection. If sacrificial anodes are used for this, these must be replaced and renewed when, and as soon as, they are 60% or more consumed. When electric anodes are used, it is important to ensure that they continue to work properly.

The warranty set out in articles 1 and 2 will not apply in the event of:

a.damage to the water heater caused by an external factor;

b.misuse, neglect (including frost damage), modification, incorrect and/or unauthorised use of the water heater and any attempt to repair leaks;

c.contaminants or other substances having been allowed to enter the tank;

d.the conductivity of the water being less than 125 µS/cm and/or the hardness (alkaline-earthions) of the water being less than 1.00 mmol/litre(3.3.3 "Water composition");

e.unfiltered, recirculated water flowing through or being stored in the water heater;

f.any attempts at repair to a defective water heater other than by an approved service engineer.

The obligations of A.O. Smith pursuant to the specified warranty do not extend beyond free delivery from the Veldhoven warehouse of the replacement sections, parts or water heater respectively. Shipping, labour, installation and any other costs associated with the replacement will not be accepted by A.O. Smith.

A claim on grounds of the specified warranty must be submitted to the dealer from whom the water heater was purchased, or to another authorised dealer for A.O. Smith Water Products Company products. Inspection of the water heater as referred to in articles 1 and 2 shall take place in one of the laboratories of A.O. Smith Water Products Company.

A.O. Smith grants no other warranty or guarantee over its water heaters nor the (sections or parts of) water heaters supplied for replacement, other than the warranty expressly set out in this Certificate.

Under the terms of the supplied warranty, A.O. Smith is not liable for damage to persons or property caused by (sections or parts, or the glass-linedsteel tank of) a (replacement) water heater that it has supplied.

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14 Appendices

14.1 Introduction

This section gives the electrical diagrams for:

 

Electrical diagram for ADM 40 to 135 natural gas and 40 to 115 LPG

 

Electrical diagram 135 - LP gas

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Appendices

 

 

is

14.2Electrical Diagrams ADM

14.2.1Electrical diagram for ADM 40 to 135 natural gas and 40 to 115 LPG

1

230V AC

 

50Hz

 

 

 

2

L

N

 

 

3

 

A

4

 

 

 

 

 

L1

N

4

4

 

 

 

L2

L3

 

B

1

2

3

4

5

6

3

1

2

4

4

 

H

1

4

4

4

11

12

11

12

 

3

 

 

3

0 I

J

1 4

4

11

12

1

K

3

4

11

12

4

L

3

C D E

F

FUSE

F1

G

 

 

 

 

 

SUR-

 

 

R1

 

 

 

 

 

 

 

HOT

 

 

 

 

 

 

 

 

 

 

FACE

 

 

 

 

 

 

 

T

G

M

L

 

 

 

N

N

 

 

V

A

 

 

 

 

L' L" N H N 1 N X N G

 

 

I

O P C

1

1 2

4

1

2 4

4 4

3 3

3

3 4

4

1

L

N

L N

M

 

24V

 

1

2

3

4

4

4

L

N

 

N

L

I

7

8

9

10

11

12

1

2

3

4

4

4

0305471 R1

N O P

1 = brown, 2 = blue, 3 = yellow/green, 4 = black, 5 = white (flat cable)

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TERMINAL STRIP CONNECTIONS:

 

Earth

N

Neutral

L1

Phase input of controller

L2

Phase input of flue gas thermostat

L3

Phase output of flue gas thermostat

COMPONENTS:

ATwo-poleisolator switch

BFlue gas thermostat

C"Error" signalling

D"Operational" signalling

ERESET button

FBurner control

GControl thermostat

HFrost thermostat

JController 0/I switch

KSafety thermostat

LHigh-limitthermostat

MExtra error signal connection

NGas control

OHot surface igniter

PFlame probe

CONTROLLER CONNECTIONS:

N1

Neutral

 

Earth

L'

Phase input of controller

L"

Phase output to safety circuit and thermostat circuit

TH

Phase input of thermostat circuit

GV1

Phase output to gas control

MAX

Phase input to safety thermostat

LG

Phase output to hot surface igniter

I

Detection of ionisation signal

NO

Normally open port of the extra error sensor

P

Phase input of extra error sensor

NC

Normally closed port of the extra error sensor

F1

Fuse

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Appendices

 

 

14.2.2Electrical diagram 135 - LP gas

1

230V AC

50Hz

 

 

 

2

L

N

 

 

3

 

A

4

 

 

 

 

1

2

4

4

1

2

3

4

5

B

L1

N

L2

L3

3

1

2

4

4

is

 

 

 

 

 

 

C

D

E

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FUSE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

4

4

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

12

11

12

 

 

 

 

R1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SUR-

 

 

 

 

 

 

 

 

 

 

 

 

H

 

 

 

G

 

HOT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FACE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G

M

L

 

 

 

N

N

 

 

 

 

 

 

 

 

 

 

 

T V

A

 

 

 

 

 

 

 

 

 

 

 

 

 

3

3

 

L L" N H N 1 N X N G

 

I

 

O P C

 

 

 

 

 

 

 

 

 

0

I

 

 

1 1 2 4 1 2 4 4 4

 

3 3 3 3 4

 

4 1

 

 

 

 

 

 

 

 

J

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

N

 

 

4

11

12

1

 

 

 

 

 

 

 

 

 

 

 

 

 

24V

 

 

 

K

 

 

 

 

 

1

2

3

4

4

 

4

 

 

 

 

 

 

 

 

 

3

 

 

 

1

2

3

4

 

5

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

11

12

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

1

4

4

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

A1 15

 

A1 15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L1L1

 

L2L2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T1

 

T2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L2

N L3 N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R 18 16 A2 18 16 A2 R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

2

4

2

 

 

 

 

 

 

2

3

1

4

 

4

 

4

2

3

4

 

 

 

 

 

 

 

 

 

 

1

2

3

 

4

 

5

6

7

8

9

 

 

 

 

N O P Q

0304481 R1

1 = brown, 2 = blue, 3 = yellow/green, 4 = black, 5 = white (flat cable)

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