A.O. Smith ADM - 115 User Manual

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9 Starting and running

9.1Introduction

Topics covered in this chapter:

Starting the appliance;

The appliance's heating cycle.

9.2 Starting the appliance

Start the appliance as follows:

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

2.Open (3.5 "Installation diagram") the manual gas valve.

3.Switch on the power to the appliance using the isolator between the appliance and the power supply.

4.Put the appliance in ON mode by setting the ON/OFFswitch on the control panel to position I.

5.Using the control thermostat (7.5 "Control thermostat"), set the desired water temperature.

If there is a heat demand, the appliance will run through the heating cycle (9.3 "The appliance's heating cycle").

9.3The appliance's heating cycle

The appliance's heating cycle is activated as soon as

the measured water temperature (Twater) falls below the threshold value (Tset). This threshold value

depends on the currently selected appliance operating mode. For example, if the appliance is in OFF mode (frost protection), then this value is 20°C. If the appliance is in ON mode, for example, then this threshold value can be selected, e.g. position 3 (± 60°C).

The heating cycle runs successively through the following states:

1.HEAT DEMAND;

2.WAIT;

3.PRE-GLOW;

4.IGNITION;

5.RUNNING;

6.WAIT.

The entire cycle is explained in the example below.

Note

The cycle has the same steps when frost protection is activated.

1.The control thermostat sensor measures the temperature. The water temperature falls below the set temperature of (for example) 60°C, causing the control thermostat to close. The burner control now detects a demand and starts the heating cycle.

2.Following demand, the wait period starts. This wait ensures that the ignition is safe. The wait period lasts approximately 15 seconds.

3.Once the wait period has elapsed (there is audible ‘clicking’ of the relay in the burner control), the PRE-GLOWstarts.

4.After about 12 seconds (pre)glowing, the gas control opens and ignition takes place.

5.After ignition, the flame is detected and the appliance will be running. This means that actual heating has started.

6.When the water reaches the set temperature, the demand ceases. The gas control closes and the burner tray is extinguished. A new wait period of about 10 seconds starts.

7.At the end of this wait, the appliance enters the idle state, and waits until the water temperature once more falls below the set temperature.

With any subsequent heat demand, the heating cycle will resume from step 1.

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Starting and running

 

 

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10Shutting down

10.1Introduction

Topics covered in this chapter:

Shutting down the appliance for a brief period (OFF mode);

Isolating the appliance from the mains;

Shutting the appliance down for a long period.

10.2Shutting down the appliance for a brief period (OFF mode)

To shut the appliance down for a brief period, you must activate frost protection using the appliance's heating cycle (2.3 "The appliance's heating cycle").

By using the frost protection, you can prevent water freezing in the appliance. Frost protection is activated by setting the ON/OFF switch on the control panel to position 0.

10.3 Isolating the appliance from the mains

The appliance should only be isolated from mains power in the correct way. The correct procedure is as follows:

1.Shut down the appliance by setting the ON/OFF switch to position 0.

2.Isolate the water heater from the power supply by putting the isolator between the appliance and the mains power supply to position 0.

10.4Shutting the appliance down for a long period

To shut the appliance down for a longer period, you must drain the appliance (6 "Draining").

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Shutting down

 

 

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11 Troubleshooting

11.1

Introduction

This chapter deals with the following problems with the appliance:

 

 

Gas smell.

 

 

Water leakage.

 

 

Explosive ignition.

 

 

Poor flame profile.

 

 

No hot water.

 

 

Insufficient hot water.

11.2

Error conditions

If the water heater goes into an "error" condition, you will be unable to draw hot

 

 

water. The frost protection will also be out of operation. These error conditions

 

 

are divided into three groups:

 

 

Lockout error from the flue gas thermostat

 

 

 

The safety (pushbutton) on the flue gas thermostat in the draught diverter

 

 

 

has been activated. After removing the cause, the pushbutton (7.6 "Burner

 

 

 

control reset button") must be pressed to restart the appliance.

 

 

Lockout error from the flue gas thermostat

 

 

 

When this happens, the red LED on the control panel will be illuminated. The

 

 

 

burner control is locked out.

 

 

 

After eliminating the cause, the appliance must be returned to service by

 

 

 

pressing the reset button (7.6 "Burner control reset button").

 

 

Blocking errors

 

 

 

You can recognise this condition from the fact that the appliance does not

 

 

 

start running even though the water temperature is lower than the setting

that you have defined using the control thermostat (7.5 "Control thermostat").

These errors disappear automatically once the cause of the error has been removed, after which the appliance resumes operation by itself.

The following pages provide troubleshooting tables for each type of error.

Note

Footnotes referred to from within any table are shown at the bottom of the last page of that table.

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11.3 Troubleshooting table for general errors

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

General faults and failures

Symptom

Cause

Precautions

 

Comment

 

 

 

 

 

 

 

 

 

Gas smell

Gas leak

 

 

 

 

 

 

 

Warning

 

 

Note

 

 

 

 

 

 

 

 

 

 

Close the main gas valve immediately.

 

 

Contact your installation engineer or local gas company

 

 

 

 

Warning

 

 

immediately.

 

 

 

 

Do not operate any switches.

 

 

 

 

 

 

 

Warning

 

 

 

 

 

 

 

No naked flames.

 

 

 

 

 

 

 

Warning

 

 

 

 

 

 

 

Ventilate the boiler room.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Water leakage

Leakage from a water

Tighten the threaded connection

 

If the leak persists, consult your installation engineer

 

 

connection (threaded)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Leakage from another

Trace the leak

 

 

 

 

 

nearby water appliance

 

 

 

 

 

 

 

or pipe segment

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Leakage from the

Consult the supplier and/or manufacturer

 

 

 

 

 

appliance's tank

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Condensation

Before drawing (too much) tap water, wait until the water in the

 

 

 

 

 

 

boiler has reached the set temperature.

 

 

 

 

 

 

 

 

 

 

 

Explosive ignition

Incorrect supply

Set the correct supply pressure and/or burner

 

 

If ignition is not improved, consult your installation engineer.

 

 

pressure and/or burner

pressure. (3.11 "Checking the supply pressure and burner

 

 

 

 

Poor flame profile

pressure

pressure")

 

 

 

 

 

Contaminated burner

Clean the burner(s) (12.4.2 "Clean the burner(s)")

 

 

 

 

 

 

 

 

 

 

 

 

Contaminated orifice

Clean the orifice(s) (12.4.3 "Clean the orifice(s)")

 

 

 

 

 

 

 

 

 

 

 

 

 

Inadequate air supply

 

Improve the air supply by providing better ventilation in the boiler

 

 

 

 

 

 

room.

 

 

 

 

 

 

 

 

 

 

 

 

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11.4 ADM Troubleshooting table - no hot water

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

No hot water

Symptom

Cause

Precautions

Comment

 

 

 

 

 

Green LED OFF and

No supply voltage

1.

Check if the isolator is ON.

See the ADM electrical diagram (14 "Appendices")

Red LED ON

present

2.

Check whether there is power to the isolator

If the error cannot be rectified, contact your installation engineer

 

 

 

 

 

3.

Check whether there is power to the electrical connector block

 

 

 

4.

Check whether there is power to the burner control

 

 

 

5.

Check fuse in the burner control

 

 

 

 

The measured voltage must be 230 VAC (-15%,+10%).

 

 

 

 

 

 

Green LED ON and

Blockage in the flue gas

1.

Trace the blockage

When a demand is detected, the appliance will restart

Red LED OFF

discharge (the flue gas

2.

Remove the blockage

 

 

thermostat has cut out)

3.

Reset flue gas thermostat (7.7 "Flue gas thermostat reset

 

 

 

 

 

 

 

button").

 

 

 

 

 

 

Symptom

Cause

Precautions

Comment

 

 

 

 

Green LED ON and

There are three possible causes for this error. In order to determine the cause, you must

If the error cannot be resolved or is persistent, contact your

Red LED ON

cause the error to appear again:

installation engineer

 

1.

Reset the appliance by pressing the reset button 1x

 

 

2.

If nothing happens, then the reset button has been pressed too often (maximum 5 times

 

 

 

in a single heating cycle). Disconnect the appliance from the mains and then restart it.

 

 

 

SeeIsolating the appliance from the mains and steps 3 through 5 of Starting the

 

 

 

appliance.

 

 

 

3.

Decide which type of cause (a) or (b) describes the situation. (see tables below)

 

 

 

 

 

 

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Symptom

Cause

Precautions

Comment

 

 

 

 

 

 

 

 

(a)

1.

No gas:

If the error cannot be resolved or is persistent, contact your

 

 

three unsuccessful

 

- Check that the gas valve is open

installation engineer

 

 

start attempts in a row

 

 

 

 

 

- Check whether the gas control is opening (clicking of the

 

 

 

 

 

 

 

 

 

 

gas control)

 

 

 

 

 

- Check the leads of the gas control

 

 

 

 

2.

No ignition:

 

 

 

 

 

- Check whether the hot surface igniter lights up

 

 

 

 

 

- Check the electrical supply to the hot surface igniter.

 

 

 

 

 

- Check the leads of the glow igniter

 

 

 

 

3.

No flame detection:

 

 

 

 

 

- Check that the Phase (L) and Neutral (N) are correctly

 

 

 

 

 

connected (from the mains) to the appliance

 

 

 

 

 

- Check whether the flame probe is defective

 

 

 

 

 

- Check that the flame probe leads are properly connected

 

 

 

 

 

 

 

 

 

 

 

Symptom

Cause

Precautions

Comment

 

 

 

 

 

 

 

 

(b)

1.

The safety thermostat has cut out correctly:

If the error cannot be resolved or is persistent, contact your

 

 

The safety thermostat

 

- Reset the appliance

installation engineer

 

 

has cut out

 

 

 

 

 

- Check whether the control thermostat is working

 

 

 

 

 

 

 

 

 

 

- Check whether the high-limitthermostat is working

 

 

 

 

 

- Check that the circulation pump (if present) is working

 

 

 

 

2. The safety thermostat has cut out without apparent reason:

 

 

 

 

 

- Check whether the thermostat is defective

 

 

 

 

 

- Check whether the sensor of the thermostat is defective

 

 

 

 

 

 

 

 

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11.5 Troubleshooting table - 'insufficient hot water'

Warning

Maintenance may only be performed by a qualified service and maintenance engineer.

Insufficient hot water

Symptom

Cause

Precautions

Comment

 

 

 

 

Insufficient hot water

Water temperature

Set the control thermostat (7.5 "Control thermostat") to a higher

 

 

setting (Tset) is too low

value

 

 

Hot water supply is

1.

Reduce hot water consumption and give the appliance time to

If the error has not been rectified, and no other cause can be found,

 

used up

 

heat up.

isolate the appliance from the mains (10.3 "Isolating the appliance

 

 

2.

If this error persists, check whether the high-limitthermostat is

from the mains"), shut off the manual gas valve and alert your

 

 

installation engineer.

 

 

 

switching. If this is the case, check that the circulation and/or top

 

 

 

 

to bottom circulation pump are working.

 

 

 

 

 

 

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