AO Smith Water Heater ADM 115 User Manual

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Read this manual carefully  
Warning  
Read this manual carefully before starting up the water heater. Failure to  
read this manual and to follow the instructions in this manual may lead to  
accidents, personal injury, and damage to the appliance.  
Copyright © 2008 A.O. Smith Water Products Company  
All rights reserved.  
Nothing from this publication may be copied, reproduced and/or published by  
means of printing, photocopying or by whatsoever means, without the prior  
written approval of A.O. Smith Water Products Company.  
A.O. Smith Water Products Company reserves the right to modify specifications  
stated in this manual.  
Any brand names mentioned in this manual are registered trademarks of their  
respective owners.  
Trademarks  
Liability  
A.O. Smith Water Products Company accepts no liability for claims from third  
parties arising from improper use other than that stated in this manual and in  
accordance with the General Conditions registered at the Eindhoven Chamber  
of Commerce.  
Refer further to the General Conditions. These are available on request, free of  
charge.  
Although considerable care has been taken to ensure a correct and suitably  
comprehensive description of all relevant components, the manual may  
nonetheless contain errors and inaccuracies.  
Should you detect any errors or inaccuracies in the manual, we would be  
grateful if you would inform us. This helps us to further improve our  
documentation.  
If you have any comments or queries concerning any aspect related to the  
appliance, then please do not hesitate to contact:  
More information  
A.O. Smith Water Products Company  
PO Box 70  
5500 AB Veldhoven  
Netherlands  
Telephone:  
(free) 0870 - AOSMITH  
0870 - 267 64 84  
General:  
Fax:  
+31 40 294 25 00  
+31 40 294 25 39  
E-mail :  
Website:  
In the event of problems with connecting to the gas, electricity or water supply,  
please contact your installation's supplier/installation engineer .  
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Table of contents  
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Table of contents  
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1 Introduction  
This manual describes how to install, service and use the ADM appliance. The  
ADM appliance is a gas-fired open boiler without fan. ADM appliances are  
equipped with a flue gas backflow safeguard.  
1.1 About the appliance  
The ADM is an appliance of type B  
.
11BS  
The information in this manual applies to types: ADM 40, ADM 50, ADM 60,  
ADM 80, ADM 90, ADM 115 and ADM 135.  
The appliance has been manufactured and equipped in accordance with the  
European standard for gas-fired storage water heaters for the production of  
domestic hot water (EN 89). The appliances are therefore compliant with the  
European Directive for Gas Appliances, and and are entitled to bear the CE  
mark.  
0063  
Warning  
Read this manual carefully before starting up the water heater. Failure to  
read the manual and to follow the printed instructions may lead to personal  
injury and damage to the appliance.  
Warning  
If there is a gas smell:  
1.2 What to do if you  
smell gas  
No naked flames! No smoking!  
Avoid causing sparks! Do not use any electrical equipment or switch, i.e. no  
telephones, plugs or bells!  
Open windows and doors!  
Shut off the mains gas supply valve!  
Warn occupants and leave the building!  
After leaving the building, alert the gas distribution company or your installation  
engineer.  
As the (end) user, installation engineer or service and maintenance engineer,  
you must ensure that the entire installation complies, as a minimum, with the  
official local:  
1.3 Regulations  
building regulations;  
energy supplier's directives for existing gas installations;  
directives and technical guidelines for natural gas installations;  
safety requirements for low-voltage installations;  
regulations governing the supply of drinking water;  
regulations governing ventilation in buildings;  
regulations governing the supply of air for combustion;  
regulations governing the discharge of products of combustion;  
requirements for installations that consume gas;  
regulations governing indoor waste water disposal;  
regulations imposed by fire brigade, power companies and municipality.  
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Introduction  
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Furthermore, the installation must comply with the manufacturer's instructions.  
Note  
Later amendments and/or additions to all regulations, requirements and  
guidelines published on or prior to the moment of installing, will apply to the  
installation.  
The three target groups for this manual are:  
1.4 Target groups  
(end) users;  
installation engineers;  
service and maintenance engineers.  
Symbols on each page indicate the target groups for whom the information is  
intended. See the table.  
Target group symbols  
Symbol  
Target group  
(End) user  
Installation engineer  
Service and maintenance engineer  
A service should be carried out at least once a year, both on the water side and  
on the gas side. Maintenance frequency depends, among other things, on the  
water quality, the average burning time per day and the set water temperature.  
1.5 Maintenance  
Note  
To determine the correct maintenance frequency, it is recommended to  
arrange for the service and maintenance engineer to check the appliance on  
both the water and gas side within three months following installation. Based on  
this check, the best maintenance frequency can be determined.  
Note  
Regular maintenance extends the service life of the appliance.  
Note  
Both the end user and the service and maintenance engineer are  
responsible for regular maintenance. They will need to establish clear  
agreements on this.  
Note  
If the appliance is not regularly maintained, the warranty will become void.  
The following notation is used in this manual:  
1.6 Forms of notation  
Note  
Important information.  
Caution  
Ignoring this information can lead to the appliance being damaged.  
Warning  
Failure to carefully read this information may lead to personal injury and  
serious damage to the appliance.  
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1.7 Overview of this  
document  
The table provides an overview of the contents of this document.  
Contents of this document  
Chapter  
Target groups  
Description  
This chapter describes how the appliance functions.  
This chapter describes the installation activity to be  
completed before you actually start up the appliance.  
This chapter describes how to fill the appliance.  
This chapter describes how to drain the appliance.  
This chapter describes the general operation of the  
appliance and explains how to use the control panel.  
This chapter describes the status (mode or condition) that  
the appliance may have, and possible actions to take.  
This chapter describes how to start the appliance running.  
The general heating cycle of the appliance is also  
described.  
This chapter describes how to shut the appliance down for  
a brief or long period of time.  
This chapter is mainly intended for the installation  
engineer and the service and maintenance engineer. It  
describes appliance errors. A table is included stating  
potential symptoms, causes and solutions. End users  
may also refer to this chapter for additional information  
about the appliance.  
This chapter sets out the maintenance tasks to be carried  
out during a service.  
This chapter states the warranty terms and conditions.  
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1
Introduction  
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2 Working principle of  
the appliance  
Topics covered in this chapter:  
2.1 Introduction  
The figure shows a cut-away view of the appliance.  
2.2 General working  
principle of the  
appliance  
Cut-away view of the appliance  
Legend  
22  
Only applicable numbers are  
mentioned.  
38  
39  
2. hot water outlet  
6. control panel  
8. combustion chamber  
9. anode  
33  
9
40  
11  
10. tank  
2
6
11. heat exchanger  
12. inspection and cleaning opening  
14. cold water inlet  
15. drain valve  
41  
42  
37  
43  
44  
16. gas control  
20. spark igniter  
34  
24  
10  
12  
45  
46  
21. flame probe  
22. chimney pipe  
24. insulation layer  
33. draught diverter  
34. flue gas sensor  
20  
35. radiation shield/condensation  
tray  
21  
14  
15  
8
36. bar burners/burner tray  
37. flue gas thermostat  
38. safety thermostat sensor  
39. high-limit thermostat sensor  
40. burner control  
36  
35  
16  
41. control thermostat  
IMD-0133 R2  
42. high-limit thermostat  
43. safety thermostat  
44. frost thermostat  
45. control thermostat sensor  
46. frost thermostat sensor  
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Working principle of the appliance  
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In this appliance, the cold water enters the bottom of the tank through the cold  
water inlet (14). The heat of combustion is conducted to the water by the  
combustion chamber (8) and heat exchanger (11). The heated tap water leaves  
the tank through the hot water outlet (2). Once the appliance is completely filled  
with water, it will constantly be under mains water pressure. When hot water is  
drawn from the appliance, it is immediately replenished with cold water.  
The gas required for combustion flows via the gas control (16) into the manifold.  
Orifices are mounted in the manifold. The gas is injected into the burner bars at  
pressure from these orifices (36). The burner bars together form the burner tray.  
The injection of gas into the burner bars also draws in the primary air required  
for combustion. The narrow opening in the orifice causes the gas flow to  
accelerate. This in turn causes a partial vacuum. It is this partial vacuum that  
draws in the air (the Venturi effect). Additional air is drawn in through the  
opening in the burner tray.  
The hot surface igniter (20) ensures ignition of the gas/air mixture.  
The flue gases released by this combustion are led through the flue tubes (part  
of 11). Flue baffles (part of 11) are mounted in the flue tubes. These retard the  
flow of the flue gases, thereby increasing the thermal efficiency of the appliance.  
The flue gases are vented from the appliance via the draught diverter (33).  
A radiation shield/condensation tray (35) is mounted below the burner tray. This  
prevents overheating of the floor area below the appliance, as well as serving  
as a collection tray for condensation water.  
The insulation layer (24) prevents heat loss. The inside of the tank is enamelled  
to protect against corrosion. The anodes (9) offer extra protection.  
2.3 The appliance's  
heating cycle  
The entire appliance is controlled by the burner control (40) and the control  
thermostat (41) or frost thermostat (44). The control thermostat and frost  
thermostat both independently measure the water temperature (T  
). The  
water  
appliance's heating cycle is activated as soon as T  
falls below the threshold  
water  
value (T ). The value of T depends on the selected mode of the  
set  
set  
appliance (8.2 "Operating modes"). When the appliance is in OFF mode (frost  
protection), this value is determined by the frost thermostat (threshold value =  
20°C). When the appliance is in ’ON mode’, the threshold value can be set via  
the control thermostat (±40°C - ±70°C).  
As soon as T  
falls below T , the relevant thermostat (control or frost) will  
set  
water  
close, and the burner control will register demand. The gas control (16) is  
opened, and the gas is mixed with air. This mixture is ignited by the hot surface  
igniter (20) and the water is heated. As soon as T  
gets higher than T , the  
water  
set  
thermostat opens again. The demand will cease, and the burner control will stop  
the heating cycle.  
The thermostats have a certain margin both when closing and opening. We refer  
to this margin as the hysteresis. The hysteresis cannot be adjusted.  
2.4 Protection for the  
appliance  
2.4.1 Introduction  
The burner control monitors the water temperature by means of thermostats  
and ensures safe combustion. This takes place using:  
the Flame probe.  
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2.4.2 Water temperature protection  
By means of the frost, high-limit and safety thermostats, the burner control  
monitors three temperatures that are important for safety. The table explains the  
working principle of the thermostats with sensors.  
Temperature protection  
Protection  
Description  
Frost thermostat  
When the frost thermostat sensor (46) measures a temperature of 20°C or  
less, the heating cycle (2.3 "The appliance's heating cycle") will start.  
High-limit thermostat  
Safety thermostat  
When the high-limit thermostat sensor (39) measures a temperature higher  
than 84°C, the high-limit thermostat will open. The heat demand is terminated  
and the burner control halts the heating cycle until the high-limit thermostats  
close once more. At that moment the burner control will reset the appliance and  
the heating cycle will restart. The high-limit safeguard serves to prevent  
overheating and/or excessive formation of scale in the appliance.  
When the safety thermostat sensor (38) measures a temperature higher than  
93°C, the safety thermostat will open. The heat demand is terminated and the  
burner control will immediately halt the heating cycle. The burner control will go  
into a lockout error state. This must be manually reset before the appliance can  
resume operation.  
2.4.3 Flue gas backflow safeguard  
The flue gases are discharged to the outside via the draught diverter (33) and  
the flue (22). To prevent the flue gases from flowing back into the boiler room,  
the discharge ducting is monitored by a feature called the Thermal Reflux  
Safeguard (TRS). This uses a flue gas thermostat (37) with a flue gas  
thermostat sensor (34) that are located in the draught diverter. Under normal  
circumstances this sensor will register the ambient temperature.  
However, if the chimney is not drawing sufficiently (for example, due to a  
blockage in the chimney), the flue gases will 'reflux' and flow back past the flue  
gas thermostat sensor. The sensor will then detect an excessive temperature  
and the flue gas thermostat will open. The demand will cease, and the burner  
control will immediately stop the heating cycle. The flue gas thermostat will also  
lock out. It must be manually reset before the appliance can resume operation .  
2.4.4 Flame probe  
To ensure that no gas can flow when there is no combustion, the water heater  
is fitted with a flame probe (21). The burner control uses the ionisation-detecting  
properties of this probe for flame detection. The burner control closes the gas  
valve the instant it determines that there is a gas flow but no flame is present.  
2.5 Safety of the  
installation  
In addition to the appliance's standard built-in safety monitoring, the appliance  
must also be protected by an expansion vessel, expansion valve, pressure  
reducing valve, non-return valve and a T&P valve.  
The use of an expansion vessel, expansion valve and/or pressure reducing  
valve depends on the type of installation: unvented or vented.  
2.5.1 Inlet combination and pressure-reducing valve  
In addition to the appliance's standard built-in safety monitoring, the appliance  
must also be protected by an expansion vessel, expansion valve, pressure  
reducing valve, non-return valve and a T&P valve.  
The use of an expansion vessel, expansion valve and/or pressure reducing  
valve depends on the type of installation: unvented or vented.  
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Working principle of the appliance  
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2.5.2 Unvented installation  
With an unvented installation, an expansion valve valve and expansion vessel  
prevent the buildup of excessive pressure in the tank. This prevents damage  
being caused to the enamelled coating (in the appliance) or to the tank. A non-  
return valve prevents excessive pressure buildup in the water supply system.  
This valve also prevents water from flowing backwards from the tank into the  
cold water supply system. The pressure reducing valve protects the installation  
against an excessively high water supply pressure (> 8 bar). These components  
are fitted to the cold water pipe (3.6 "Water connections, Vented").  
2.5.3 Vented installation  
With vented installation, excess pressure is taken up by the open cold water  
head tank. The head height of the tank determines the working pressure in the  
water heater, which may not exceed 8 bar. The installation must also be fitted  
with a vent pipe from the hot water pipe (3.6.3 "Hot water side"), which opens  
into the cold water tank.  
2.5.4 T&P valve  
A T&P valve is only mandatory in an unvented installation. However, A.O. Smith  
also recommends the use of a T&P valve in vented installations.  
A T&P (Temperature and Pressure Relief) valve monitors the pressure in the  
tank and the water temperature at the top of the tank. If the pressure in the tank  
becomes excessive (> 10 bar) or the water temperature is too high (> 97°C), the  
valve will open. The hot water can now flow out of the tank. Because the  
appliance is under water supply pressure, cold water will automatically flow into  
the tank. The valve remains open until the unsafe situation has been rectified.  
The appliance is fitted standard with a connecting point for a T&P  
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3 Installation  
Warning  
Installation work should be carried out by an approved installation engineer  
in compliance with the general and local regulations imposed by the gas, water  
and power supply companies and the fire service.  
The appliance may only be installed in a room that complies with the  
requirements stated in national and local ventilation  
regulations (1.3 "Regulations").  
This chapter describes the installation activities to be carried out before the  
appliance may be started up (9 "Starting and running"), in particular:  
3.1 Introduction  
For a possible conversion to a different gas category, see  
To avoid damaging the appliance, remove the packaging carefully.  
We recommend unpacking the appliance at or near its intended location.  
3.2 Packaging  
Caution  
The appliance may only be manoeuvred in an upright position. Take care  
that the appliance is not damaged after unpacking.  
Caution  
3.3 Ambient conditions  
The appliance may not be used in rooms where chemical substances are  
stored or used, due to the risk of explosion and/or corrosion of the appliance.  
Some propellants, bleaching agents, degreasing agents etc. disperse vapours  
which are explosive and/or which cause accelerated corrosion. If the appliance  
is used in a room in which such substances are present, the warranty will be  
void.  
ADM appliances are open appliances and may only be installed in an open  
boiler room. Their type is B  
.
11BS  
3.3.1 Air humidity and ambient temperature  
The boiler room must be frost-free, or be protected against frost. The table  
shows the environmental conditions that must be adhered to for correct  
functioning of the electronics present in the appliance to be guaranteed.  
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Installation  
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Air humidity and ambient temperature specifications  
Air humidity and ambient temperature  
Air humidity  
max. 93% RV at +25°C  
Functional: 0 < T < 60°C  
Ambient temperature  
3.3.2 Maximum floor load  
In connection with the appliance's weight, take account of the maximum floor  
loading, refer to the table.  
Weight of the appliance filled with water  
ADM 40  
504 kg  
ADM 50  
578 kg  
ADM 60  
507 kg  
ADM 80  
573 kg  
ADM 90  
522 kg  
ADM 115  
523 kg  
ADM 135  
581 kg  
3.3.3 Water composition  
The appliance is intended for heating drinking water. The drinking water must  
comply with the regulations governing drinking water for human consumption.  
The table gives an overview of the specifications.  
Water specifications  
Water composition  
Hardness  
> 1.00 mmol/l:  
(alkaline earth ions)  
German hardness> 5.6° dH  
French hardness > 10.0° fH  
English hardness > 7.0° eH  
Conductivity  
> 125 µS/cm  
Acidity (pH value)  
7.0 < pH value < 9.5  
Note  
If the water specifications deviate from those stated in the table, then the  
tank protection cannot be guaranteed (13 "Warranty (certificate)").  
3.3.4 Working clearances  
For access to the appliance, it is recommended that the following clearances  
are observed (see figure):  
AA: around the appliance's control column and cleaning openings: 100 cm.  
BB: all sides of the appliance: 50 cm.  
Above the appliance (room to replace the anodes):  
-
-
100 cm if using fixed anodes, or  
50 cm if using flexible anodes.  
If the available clearance is less than 100 cm, flexible magnesium anodes  
may be ordered.  
Note  
When installing the appliance, be aware that any leakage from the tank  
and/or connections can cause damage to the immediate environment or floors  
below the level of the boiler room. If this is the case, the appliance should be  
installed above a wastewater drain or in a suitable metal leak tray.  
The leak tray must have an appropriate wastewater drain and must be at least  
5cm deep with a length and width at least 5cm greater than the diameter of the  
appliance.  
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Working clearances  
IMD-0262 R2  
The appliance is supplied without accessories. Check the  
3.4 Technical  
and other specifications (3.4.2 "General and electrical specifications") of any  
accessories you plan to use.  
specifications  
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3.4.1 Dimensions of the appliance  
Plan and elevation of the appliance  
Legend  
See the table.  
F
10º  
37º 45º  
G
H
D
2
5
6
6
1
4
3
IMD-0135 R2  
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Dimensions (all measurements in mm unless otherwise indicated)  
Dime Description  
nsion  
ADM  
40  
ADM  
50  
ADM  
60  
ADM  
80  
ADM  
90  
ADM  
115  
ADM  
135  
A
B
D
E
F
Total height  
1900  
1760  
710  
2100  
1960  
710  
1900  
1760  
710  
2100  
1960  
710  
2000  
1795  
710  
2085  
1870  
710  
2085  
1870  
710  
Height of top of appliance  
Appliance diameter  
Depth  
800  
800  
800  
800  
800  
800  
800  
Width  
1100  
150  
1100  
150  
1100  
180  
1100  
180  
1105  
225  
1105  
225  
1105  
225  
G
H
Diameter of chimney flue  
Heart appliance / Heart chimney  
flue  
660  
660  
660  
660  
675  
675  
675  
J
Height of chimney flue  
1840  
400  
2040  
400  
1840  
400  
2040  
400  
1935  
400  
2010  
400  
2010  
205  
K
M
N
P
R
S
1
Height of gas connection  
Height of cold water supply  
Height of hot water outlet  
Height of cleaning opening  
Height of drain valve connection  
Height of T&P valve connection  
565  
565  
565  
565  
575  
650  
650  
1605  
730  
1810  
730  
1605  
730  
1810  
730  
1640  
740  
1715  
825  
1715  
855  
500  
515  
500  
515  
525  
600  
595  
1550  
1760  
1550  
1760  
1595  
1660  
1660  
1
1
1
1
1
1
1
Cold water supply connection  
(male)  
R1 /  
R1 /  
R1 /  
R1 /  
R1 /  
R1 /  
R1 /  
2
2
2
2
2
2
2
1
1
1
1
1
1
1
2
Hot water outlet connection  
(female)  
Rp1 /  
Rp1 /  
Rp1 /  
Rp1 /  
Rp1 /  
Rp1 /  
Rp1 /  
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
4
5
Gas control connection (female)  
Drain valve connection (female)  
T&P valve connection (female)  
Rp /  
Rp /  
Rp /  
Rp /  
Rp /  
Rp /  
Rp1  
4
4
4
4
4
4
1
1
1
1
1
1
1
Rp1 /  
Rp1 /  
Rp1 /  
Rp1 /  
Rp1 /  
Rp1 /  
Rp1 /  
2
2
2
2
2
2
1
1
1
1 - 11.5 1 - 11.5 1 - 11.5 1 - 11.5 Rp1 /  
Rp1 /  
Rp1 /  
2
NPT  
NPT  
NPT  
NPT  
6
Cleaning/inspection opening  
Ø 100  
Ø 100  
Ø 100  
Ø 100  
Ø 100  
Ø 100  
Ø 100  
3.4.2 General and electrical specifications  
General and electrical specifications  
DESCRIPTION  
Unit  
ADM  
40  
ADM  
50  
ADM  
60  
ADM  
80  
ADM  
90  
ADM  
115  
ADM  
135  
Capacity  
litres  
309  
8
357  
8
298  
8
335  
8
278  
8
253  
8
252  
8
Maximum operating pressure bar  
Empty weight  
kg  
195  
30  
2
221  
26  
2
209  
19  
2
238  
17  
3
244  
12  
3
270  
8
329  
7
o
Heating-up time T = 45 C  
minutes  
Number of anodes  
-
-
4
4
Number of bar  
burners/orifices  
3
4
5
7
7
9
6
Number of flue tubes/flue  
baffles  
-
5
6
7
9
12  
16  
17  
Electrical power consumption W  
30  
30  
30  
30  
30  
30  
60  
Supply voltage  
volts  
230  
230  
230  
230  
230  
230  
230  
(-15% +10% VAC)  
Mains frequency  
IP class  
Hz (± 1Hz) 50  
30  
50  
30  
50  
30  
50  
30  
50  
30  
50  
30  
50  
30  
-
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Installation  
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3.4.3 Gas data  
Gas data  
Description II  
Unit  
ADM  
40  
ADM  
50  
ADM  
60  
ADM  
80  
ADM  
90  
ADM  
115  
ADM  
135  
2H3+  
Gas category 2H: General  
Orifice diameter  
mm  
3.20  
2
3.20  
2
3.10  
2
2.95  
2
3.20  
2
3.20  
2
3.90  
2
(1) = Blank plate  
1, 2 or 3  
(2) = Burner pressure regulator  
(3) = High/low regulator  
Gas category G20 - 20 mbar  
Nominal load (gross calorific value) kW  
42.2  
32.3  
20  
56.5  
42.8  
20  
66.4  
50.2  
20  
82.5  
62.4  
20  
98.3  
74.3  
20  
126.6  
95.8  
20  
143.4  
109.8  
20  
Nominal output  
Supply pressure  
Burner pressure  
Gas consumption  
kW  
mbar  
mbar  
8.5  
8.5  
8.5  
8.5  
8.5  
8.5  
11.3  
13.7  
(*)  
3
m /h  
4.0  
5.4  
6.3  
7.9  
9.4  
12.1  
Gas category 3+: General  
Orifice diameter  
mm  
1.70  
1
1.70  
1
1.70  
1
1.50  
1
1.70  
1
1.70  
1
2.25  
3
(1) = Blank plate  
1, 2 or 3  
(2) = Burner pressure regulator  
(3) = High-low control  
Gas category G30 - 30 mbar  
Nominal load (gross calorific value) kW  
41.6  
32.6  
30  
55.3  
42.8  
30  
68.2  
52.8  
30  
80.7  
62.6  
30  
96.1  
74.5  
30  
123.5  
95.8  
30  
138.4  
108.5  
30  
Nominal output  
Supply pressure  
Burner pressure  
kW  
mbar  
mbar  
kg/h  
(†)  
(*)  
-
-
-
-
-
-
-
Gas consumption  
Gas category G31 - 37 mbar  
Nominal load (gross calorific value) kW  
3.0  
4.0  
5.0  
5.9  
7.0  
9.0  
10.1  
38.4  
30.0  
37  
51.1  
39.5  
37  
63.3  
48.9  
37  
77.7  
60.1  
37  
89.6  
69.2  
37  
113.0  
87.4  
37  
130.1  
101.7  
37  
Nominal output  
Supply pressure  
Burner pressure  
kW  
mbar  
mbar  
kg/h  
(†)  
(*)  
-
-
-
-
-
-
-
Gas consumption  
2.7  
3.7  
4.5  
5.6  
6.4  
8.1  
9.3  
(*) Based on 1013.25 mbar and 15 °C.  
(†) If using a blank plate instead of a burner pressure regulator, it is assumed that the burner pressure is equal to  
the supply pressure. In practice, however, the burner pressure will be lower.  
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3.5 Installation diagram  
3.5.1 Installation  
This figure shows the installation diagram. This diagram is used in the sections  
in which the actual connection process is described.  
Installation diagram  
Legend  
UNVENTED  
14  
14  
14  
Only applicable numbers are  
mentioned.  
1. pressure reducing valve  
(mandatory)  
3. T&P valve (mandatory)  
4. stop valve (recommended)  
5. non-return valve (mandatory)  
6. circulation pump (optional)  
12  
B
7. top to bottom circulation pump  
(optional)  
11  
9. drain valve  
4
3
4
7
6
5
10. manual gas valve (mandatory)  
11. service stop valve (mandatory)  
16  
5
4
4
12. temperature gauge  
(recommended)  
5
1
4
14. hot water draw-off points  
A
C
15. expansion valve (mandatory)  
16. expansion vessel (mandatory)  
15  
9
D
17. 3-way aeration valve  
(recommended)  
10  
18. water tank  
19. float valve  
A. cold water supply  
B. hot water supply  
C. circulation pipe  
D. gas supply  
VENTED  
H
A
19  
E
4
E. overflow pipe  
H. overflow pipe  
18  
17  
12  
B
11  
14  
3
4
14  
14  
7
5
4
C
4
6 5  
4
C
4
9
D
10  
IMD-0466 R0  
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Warning  
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3.6 Water connections,  
Vented  
The installation should be carried out by an authorised installation engineer,  
in compliance with general and local regulations (1.3 "Regulations").  
3.6.1 Cold water side  
See (A) in the installation diagram (3.5 "Installation diagram").  
1. Fit an approved stop valve (4) on the cold water side between the cold water  
head tank (18) and the appliance, as required by  
regulations (1.3 "Regulations").  
3.6.2 Recirculation pipe  
You can install a top to bottom circulation pump to prevent water stacking in the  
boiler.  
1. Optional: depending on the draw-off pattern, fit a recirculation pipe (Ø 22  
mm), a stop valve (11) and a top to bottom circulation pump (7).  
2. Fit a non-return valve (5).  
3. Fit a stop valve (11).  
3.6.3 Hot water side  
See (B) in the installation diagram (3.5 "Installation diagram").  
Note  
Insulating long hot water pipes prevents unnecessary energy loss.  
1. Fit the T&P valve (3).  
2. Optional: fit a temperature gauge (12) so you can check the temperature of  
the tap water.  
3. Fit a stop valve (4) in the hot water outlet pipe, for use when servicing.  
4. If a circulation pipe is required, continue further by installing the circulation  
3.6.4 Drain valve  
1. Fit the standard drain valve (9) supplied with the appliance.  
2. If applicable, fit a circulation pipe (3.6.5 "Circulation pipe").  
If not, fit the blind threaded plug and gasket (C) supplied with the drain valve,  
as shown in the figure.  
C
IMD-0122 R1  
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3.6.5 Circulation pipe  
See (C) in the installation diagram (3.5 "Installation diagram").  
If an immediate flow of hot water is required at draw-off points, a circulation  
pump can be installed. This improves comfort and reduces water wastage.  
1. Fit a circulation pump (6) of the correct capacity for the length and resistance  
of the circulation system.  
2. Fit a non-return valve (5) behind the circulation pump to guarantee the  
direction of circulation.  
3. Fit two stop valves for service purposes (4).  
4. Connect the circulation pipe to the T-piece at the drain valve (9) as shown in  
the drain valve figure (3.6.4 "Drain valve").  
Warning  
3.7 Water connections,  
Unvented  
The installation should be carried out by an authorised installation engineer,  
in compliance with general and local regulations (1.3 "Regulations").  
3.7.1 Cold water side  
See (A) in the installation diagram (3.5 "Installation diagram").  
1. Fit an approved stop valve (4) on the cold water side as required by  
applicable regulations (1.3 "Regulations").  
2. The maximum working pressure of the appliance is 8 bar. Because the  
pressure in the water pipe at times can exceed 8 bar, you must fit an  
approved pressure-reducing valve (1).  
3. Fit a non-return valve (5) and an expansion vessel (16).  
4. Fit an expansion valve (15) and connect the overflow side to an open  
wastewater pipe.  
3.7.2 Recirculation pipe  
You can install a top to bottom circulation pump to prevent water stacking in the  
boiler.  
1. Optional: depending on the draw-off pattern, fit a recirculation pipe (Ø 22  
mm), a stop valve (11) and a top to bottom circulation pump (7).  
2. Fit a non-return valve (5).  
3. Fit a stop valve (11).  
3.7.3 Hot water side  
See (B) in the installation diagram (3.5 "Installation diagram").  
Note  
Insulating long hot water pipes will prevent unnecessary energy loss.  
1. Optional: fit a temperature gauge (12) so you can check the temperature of  
the tap water.  
2. Fit the T&P valve (3).  
3. Fit a stop valve (11) in the hot water outlet pipe for servicing.  
3.7.4 Drain valve  
1. Fit the standard drain valve (9) supplied with the appliance.  
2. If applicable, fit a circulation pipe (3.6.5 "Circulation pipe").  
If not, fit the blind threaded plug and gasket (C) supplied with the drain valve,  
as shown in the figure.  
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C
IMD-0122 R1  
3.7.5 Circulation pipe  
See (C) in the installation diagram (3.5 "Installation diagram").  
If an immediate flow of hot water is required at draw-off points, a circulation  
pump can be installed. This improves comfort and reduces water wastage.  
1. Fit a circulation pump (6) of the correct capacity for the length and resistance  
of the circulation system.  
2. Fit a non-return valve (5) behind the circulation pump to guarantee the  
direction of circulation.  
3. Fit two stop valves for service purposes (4).  
4. Connect the circulation pipe to the T-piece at the drain valve (9) as shown in  
the drain valve figure (3.6.4 "Drain valve").  
Warning  
3.8 Gas connection  
The installation should be carried out by an authorised installation engineer,  
in compliance with general and local regulations (1.3 "Regulations").  
Caution  
Make sure that the diameter and length of the gas supply pipe are large  
enough to supply sufficient capacity to the appliance.  
See (D) in the installation diagram (3.5 "Installation diagram").  
1. Fit a manual gas valve (10) in the gas supply pipe.  
2. Blow the gas pipe clean before use.  
3. Close the manual gas valve.  
4. Fit the gas supply pipe to the gas control.  
Warning  
After fitting, check for leaks.  
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3.9 Chimney flue  
Warning  
The installation should be carried out by an authorised installation engineer,  
in compliance with general and local regulations (1.3 "Regulations").  
3.9.1 Introduction  
The separately-supplied draught diverter must be used when connecting the  
appliance to the chimney flue. The standard flue gas thermostat and sensor that  
are supplied must be fitted in the draught diverter.  
3.9.2 Fitting the draught diverter  
The draught diverter can be positioned according to preference. Once it is  
positioned, the draught diverter is secured to the top of the appliance using two  
screws (6), while it is also supported on a mounting bracket (1) attached to the  
side of the appliance. The mounting bracket parts can be found in the plastic  
bag attached behind the control column. The assembly procedure is as follows:  
Installing the draught diverter  
Legend  
1
2
3
4
5
6
7
8
support bracket  
holes to attach support bracket  
screws for support bracket  
holes to attach draught diverter  
sealing ring  
>0,5 m  
8
screws for draught diverter  
45° bend  
7
chimney pipe  
6
5
4
2
1
3
IMD-0123 R1  
1. Take the mounting bracket out of the bag.  
2. Fit the mounting bracket (1) in such a way that it properly supports the  
draught diverter.  
3. Drill two holes (2) (3.2 mm bit) for the mounting bracket screws.  
4. Screw the mounting bracket tightly to the appliance.  
5. Place the draught diverter in the mounting bracket, and mark the centres for  
the two holes (4) to be drilled in the top side of the appliance. Remove the  
draught diverter from the appliance.  
6. Now drill two holes (4) into the top of the appliance (3.2 mm bit).  
7. Place the sealing ring (5) on the appliance.  
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8. Screw the draught diverter tightly in place.  
9. Fit:  
-
-
a 45° bend (7) onto the outlet of the draught diverter, followed by:  
a corrosion-resistant vertical chimney pipe (8) of at least 0.5 metres in  
length,  
-
the remaining flue components.  
Note  
Use flue gas discharge materials that comply with the  
regulations (1.3 "Regulations").  
Note  
Make sure that the chimney discharges into an area approved for this type  
of appliance.  
3.9.3 Flue gas thermostat assembly  
At the top of the control column there is a plastic bag containing the flue gas  
thermostat with the sensor plus the associated fastenings. The cable from the  
sensor has already been connected to the control column. The  
thermostat/bracket and sensor have yet to be fitted inside the draught diverter.  
Warning  
If the flue gas thermostat is not (or is incorrectly) fitted/connected, the flue  
gas discharge will not be protected. An incorrectly fitted chimney can cause flue  
gases to backflow into the boiler room.  
Flue gas safety  
Legend  
1
2
3
4
bracket  
sensor  
attachment brackets  
cable  
1
2
3
IMD-0137 R2  
4
1. Fit the flue gas thermostat as follows:  
2. Take the bracket (1) and flue gas sensor (2) from the packaging.  
3. Place the bracket in de draught diverter and screw the bracket and the  
sensor firmly in place.  
4. Bend the cable clips (3) around the flue gas thermostat lead (4).  
5. Screw the cable clips (3) tightly into the draught diverter and the appliance.  
Warning  
3.10 Electrical  
connection  
The installation should be carried out by an authorised installation engineer,  
in compliance with general and local regulations (1.3 "Regulations").  
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3.10.1 Preparations  
Caution  
The appliance is phase-sensitive. It is absolutely essential to connect the  
mains live (L) to the live of the appliance, and the mains neutral (N) to the neutral  
of the appliance.  
Caution  
There must also be no potential difference between neutral (N) and earth  
( ). If this is the case, then an isolating transformer must be applied in the  
supply circuit .  
For more information or to order an isolating transformer, please contact A.O.  
Smith Water Products Company.  
The figure shows a view of the electrical connector block, and the table shows  
the appropriate connections.  
Connector block  
Legend  
A. screws  
B. protective cap  
C. connector block  
B
6
1
A
C
IMD-0134 R2  
1. In preparation, first remove the protective cover from the control column:  
2. Undo the 4 screws (A).  
3. Remove the protective cover (B) from the electrical part.  
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The connector block (C) is now visible.  
Note  
Please consult (14.2 "Electrical Diagrams ADM") the appropriate electrical  
diagram for details of the connections of the electrical components.  
Terminal block  
Mains voltage  
Flue Gas Thermostat Unused  
L
2
N
3
L
4
L
5
-
1
2
3
1
6
3.10.2 Connecting the mains power  
The appliance is supplied without a power cable and isolator.  
Note  
In order to receive electrical power, the appliance has to be connected to the  
mains power by means of a permanent electrical connection. A double-pole  
isolator with a contact gap of at least 3 mm must be fitted between this  
permanent connection and the appliance. The power cable must have cores of  
2
at least 3 x 1.0 mm .  
Warning  
Leave the appliance isolated until you are ready to start it up.  
1. Feed the power cable through the metric strain relief to the top side of the  
control column.  
2. Connect the earth ( ), live (L ) and neutral (N) of the power cable to  
1
terminals 1 through 3 in the connector block as stated in the table.  
3. Turn the strain relief tight to clamp the lead.  
4. If you do not need to make any more connections, fit the protective cover  
onto the control column.  
5. Connect the power cable to the isolator.  
Note  
3.11 Checking the supply  
pressure and burner  
pressure  
Before starting the appliance and/or checking the supply pressure and  
burner pressure, you must fill (5 "Filling") the appliance.  
Caution  
Before starting up for the first time or after conversion, you must always  
check the supply pressure and burner pressure.  
Note  
The easiest way to check the gas pressures is by using two pressure  
gauges. This procedure assumes that these two gauges are available.  
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Gas control for ADM 40 through 115  
Legend  
Only applicable numbers are  
mentioned.  
1. burner pressure regulator  
2. burner pressure regulator cap  
6
5
3. burner pressure regulator  
adjustment screw  
4. gas control connector  
5. blank plate  
7
6. supply pressure test nipple  
7. gas control  
8. manifold test nipple  
4
8
1
2
3
IMD-0127 R1  
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Installation  
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Gas control for ADM 135  
Legend  
2
Only applicable numbers are  
mentioned.  
3
1. burner pressure regulator  
1
2. burner pressure regulator cap  
9
3. burner pressure regulator  
adjustment screw  
6. supply pressure test nipple  
7. gas control  
8. manifold test nipple  
9. high-low control  
6
8
7
IMD-0129 R1  
3.11.1 Preparations  
1. Isolate the appliance from the power supply (10.3 "Isolating the appliance  
2. There are two test nipples on the gas control. Test nipple (6) is used to check  
the supply pressure. The other test nipple on the gas control is not used. The  
manifold test nipple (8) is used to measure the burner pressure.  
Sealing screws are located inside the test nipples. Loosen both sealing  
screws by a few turns. Do not completely loosen them; they can be difficult  
to re-tighten.  
3. Connect a pressure gauge to the manifold test nipple (8).  
4. Open the gas supply and bleed the air from the mains gas supply via test  
nipple (6).  
5. Connect a pressure gauge to the manifold test nipple (6) when gas starts to  
flow from this nipple.  
6. Switch on the power to the appliance using the isolator on the appliance.  
7. Set the control thermostat to the maximum temperature and start the  
appliance running by setting the ON/OFF switch to position I.  
8. The heating cycle will start, and after a short time the burner tray will ignite.  
9. After the burner tray has ignited, wait approximately 1 minute before reading  
the dynamic pressures.  
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10. Use the pressure gauge to read the supply pressure at test nipple (6). Refer  
to the gas data table (3.4.3 "Gas data").  
Note  
Consult the mains gas supply company if the supply pressure is not correct.  
11. Use the pressure gauge to read the burner pressure at nipple (8). Refer to  
the gas data table (3.4.3 "Gas data").  
Note  
If the burner pressure is not correct and the appliance is fitted with a blank  
plate or high-low control, you will not be able to adjust the pressure. In this  
case, consult your installation engineer or supplier. If the appliance is indeed  
fitted with a burner pressure regulator, the pressure can be  
3.11.2 Adjusting the pressure  
1. Remove the cap (2) from the burner pressure regulator.  
2. Depending on the correction required, correct the burner pressure by turning  
adjustment screw (3):  
-
-
Adjustment screw anticlockwise: burner pressure decreases.  
Adjustment screw clockwise: burner pressure increases.  
3. Cover the opening of the adjusting screw and check the burner pressure  
against the value given in thegas data table (3.4.3 "Gas data").  
4. If the pressure reading is not correct, repeat the burner pressure adjustment  
until the correct pressure is reached.  
5. Fit the cap (2) back on the burner pressure regulator.  
3.11.3 Finalising  
1. Shut off the gas supply.  
2. Disconnect the two pressure gauges and retighten the sealing screws in the  
test nipples.  
3. Replace the cover.  
Note  
Before starting-up the appliance, take time to fill in the warranty card  
supplied with the appliance. This enables us to guarantee the quality of our  
systems, and to further enhance our warranty procedure.  
Please return this card as soon as possible. Your customer will then receive a  
warranty certificate with our warranty conditions.  
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Installation  
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4 Conversion to a  
different gas category  
Caution  
The conversion may only by carried out by an authorised installation  
engineer.  
If the appliance must operate on a family of gases (LP gas or natural gas) or  
other gas category than that for which the appliance has been set at the  
factory, the appliance will have be adapted using a special conversion kit.  
Caution  
You must check the supply pressure and burner pressure once the  
conversion is complete.  
This chapter covers the following:  
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Conversion to a different gas category  
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Exchanging orifices  
Legend  
1. cover plate  
2. retaining strips  
3. orifice with stamped figures  
1
2
3
IMD-0126 R1  
1. Isolate the appliance from the power supply (10.3 "Isolating the appliance  
4.1 Conversion to  
different category  
ADM 40 through 115  
2. Shut off the gas supply.  
Caution  
The burner can be hot.  
3. Unscrew the cover plate (1) from the burner support.  
4. Use a suitable tool to remove the retaining strips (2). Note that the retaining  
strips have very sharp edges. Withdraw the retaining strips straight upwards.  
Note  
The radiation shield / condensation tray can be temporarily loosened to  
simplify disassembly of the burner.  
5. Remove the burners one by one from their brackets at the front. To do this,  
you first move them away from you and then downwards. The orifices will  
now be accessible  
6. Remove the orifices.  
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7. Select and fit the correct orifices from the conversion kit, based on the gas  
data table (3.4.3 "Gas data"). The orifice diameter is stamped on the orifice  
itself, see (3).  
8. Re-fit the burners back in their original position.  
9. Re-fit the retaining strips.  
10. If the radiation shield / condensation tray was loosened, re-fasten it.  
Conversion of gas control  
Legend  
Only applicable numbers are  
mentioned.  
1. burner pressure regulator  
4. gas control connector  
5. blank plate  
6
5
6. supply pressure test nipple  
7. gas control  
7
4
IMD-0131 R1  
1
11. Check whether there is a burner pressure regulator (1) attached to the gas  
control, or simply a blank plate (5).  
Note  
If the supply pressure for a gas category is the same as the burner pressure  
(see the gas data table (3.4.3 "Gas data")) then the gas control must be fitted  
with a blank plate with cork gasket. A burner pressure that deviates in  
comparison to the supply pressure requires the use of a burner pressure  
regulator with rubber gasket. Each conversion kit contains all the necessary  
components.  
12. If the blank plate or burner pressure regulator need to be replaced:  
-
-
Unscrew the connector (4) of the gas control.  
If necessary, remove the blank plate or burner pressure regulator (5)  
or burner pressure regulator (1).  
-
-
If necessary, fit the blank plate or burner pressure regulator supplied  
with the conversion kit.  
Fit the connector (4) of the gas control.  
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Conversion to a different gas category  
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13. Check the supply pressure and burner pressure (3.11 "Checking the supply  
14. Remove the sticker showing the new gas category from the conversion kit,  
and attach it below the appliance's rating plate. This clearly indicates that the  
appliance may no longer be run on the gas for which it was originally  
supplied.  
15. Start the appliance (9 "Starting and running").  
4.2 Conversion to a  
different gas  
category ADM 135  
4.2.1 Introduction  
This paragraph describes:  
Conversion of gas control  
Legend  
Only applicable numbers are  
mentioned.  
1. burner pressure regulator  
7. gas control  
9. high-low control  
1
9
IMD-0132 R1  
7
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4.2.2 Conversion from LP gas to natural gas  
Installing and removing add-on components  
Legend  
Only applicable numbers are  
mentioned.  
4. timers  
4
5
5. bracket  
6. 6-contact terminal strip  
7. strain relief  
6
8. 9-contact terminal strip  
9. metric strain relief  
10. high-low control lead  
7
8
9
10  
IMD-0130 R1  
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Conversion to a different gas category  
is  
1 through 10 .  
2. Detach the high-low control (9).  
3. Fit the burner pressure regulator (1) including the sealing gasket from the  
conversion kit. Attach the burner pressure regulator to the gas control using  
the two small screws supplied (7).  
4. Detach the leads between the 6contact terminal strip(6) and the 9contact  
terminal strip (8). These are the leads for the timers, high-low control, gas  
control, hot surface igniter and flame probe.  
5. Remove the timers (4), bracket (5), wiring harness (not shown) and 9contact  
terminal strip.  
6. Turn the metric strain relief (9) with the high-low control lead (10) to loosen  
it. Remove this lead.  
7. Fit the stop plug from the conversion set in the place of the metric strain  
relief.  
8. Connect the cables of the gas control, the hot surface igniter and flame  
probe to the 6contact terminal strip as indicated in the electrical  
9. Clamp the gas control cable in one of the supplied strain reliefs (7). Do the  
same for the leads of the hot surface igniter and flame probe.  
10. Check the supply pressure and burner pressure (3.11 "Checking the supply  
11. Remove the sticker showing the new gas category from the conversion kit,  
and attach it below the appliance's rating plate. This clearly indicates that the  
appliance may no longer be run on the gas for which it was originally  
supplied.  
12. Start the appliance (9 "Starting and running").  
4.2.3 Conversion from natural gas to LP gas  
1. Carry out steps 1 through 10 (4.1 "Conversion to different category ADM 40  
2. Detach the burner pressure regulator (1).  
3. Fit the high-low controller (9) including the sealing gasket from the  
conversion set. Attach the high-low control to the gas control using two small  
screws.  
4. Detach the leads from the gas control, the hot surface igniter and the flame  
probe to the 6contact connector strip (6) and the strain relief (7).  
5. Fit the timers (4) including cable harness plus 9contact terminal strip (6)  
from the conversion kit to the control column.  
6. Remove the stop plug (not shown) from the underside of the control column  
and replace this with the metric strain relief (9) from the conversion kit.  
7. Draw the high-low control lead (10) through the strain relief and tighten the  
strain relief by turning it until the lead is clamped.  
8. Connect the high-low control lead (10) plug to the high-low control (9).  
9. Connect the cables from the timers, highlow control, gas control and the hot  
surface igniter as shown in the electrical diagram (14.2 "Electrical Diagrams  
ADM").  
10. Check the supply pressure and burner pressure (3.11 "Checking the supply  
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11. Remove the sticker showing the new gas category from the conversion kit,  
and attach it below the appliance's rating plate. This clearly indicates that the  
appliance may no longer be run on the gas for which it was originally  
supplied.  
12. Start the appliance (9 "Starting and running").  
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Conversion to a different gas category  
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5 Filling  
Installation diagram  
Legend  
UNVENTED  
14  
14  
14  
Only applicable numbers are  
mentioned.  
1. pressure reducing valve  
(mandatory)  
3. T&P valve (mandatory)  
4. stop valve (recommended)  
5. non-return valve (mandatory)  
6. circulation pump (optional)  
12  
B
7. top to bottom circulation pump  
(optional)  
11  
9. drain valve  
4
3
4
7
6
5
10. manual gas valve (mandatory)  
11. service stop valve (mandatory)  
16  
5
4
4
12. temperature gauge  
(recommended)  
5
1
4
14. hot water draw-off points  
A
C
15. expansion valve (mandatory)  
16. expansion vessel (mandatory)  
15  
9
D
17. 3-way aeration valve  
(recommended)  
10  
18. water tank  
19. float valve  
A. cold water supply  
B. hot water supply  
C. circulation pipe  
D. gas supply  
VENTED  
H
A
19  
E
4
E. overflow pipe  
H. overflow pipe  
18  
17  
12  
B
11  
14  
3
4
14  
14  
7
5
4
C
4
6 5  
4
C
4
9
D
10  
IMD-0466 R0  
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5
Filling  
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To fill the appliance, proceed as follows:  
5.1 Filling unvented  
installations  
1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves  
(4) for the circulation pump (6).  
2. Close the drain valve (9).  
3. Open the nearest hot water draw-off point (14).  
4. Open the stop valve (4) on the cold water side (A) so that cold water flows  
into the appliance.  
5. Completely fill the appliance. When a full water jet flows from the nearest  
draw-off point, the appliance is full.  
6. Bleed the entire installation of air, for example by opening all draw-off points.  
7. The appliance is now under water supply pressure. There should be no  
water coming out of the expansion valve (15), nor the T&P valve (3). If this  
does happen, the cause might be:  
-
The water supply pressure is greater than the specified 8 bar.  
Rectify this by fitting a pressure reducing valve (1).  
-
The expansion valve in the protected cold supply setup is defective or  
incorrectly fitted.  
To fill the appliance, proceed as follows:  
5.2 Filling vented  
installations  
1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves  
(4) for the circulation pump (6).  
2. Close the drain valve (9).  
3. Open the nearest hot water draw-off point (14).  
4. Open the stop valve (4) on the cold water side (A) so that cold water flows  
into the appliance.  
5. Completely fill the appliance. When a full water jet flows from the nearest  
draw-off point, the appliance is full.  
6. Bleed the entire installation of air, for example by opening all draw-off points.  
7. The appliance is now under water supply pressure. There should be no  
water coming out of the T&P valve (3). If this does happen, the T&P valve  
might be defective or incorrectly fitted.  
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6 Draining  
Installation diagram  
Legend  
UNVENTED  
14  
14  
14  
Only applicable numbers are  
mentioned.  
1. pressure reducing valve  
(mandatory)  
3. T&P valve (mandatory)  
4. stop valve (recommended)  
5. non-return valve (mandatory)  
6. circulation pump (optional)  
12  
B
7. top to bottom circulation pump  
(optional)  
11  
9. drain valve  
4
3
4
7
6
5
10. manual gas valve (mandatory)  
11. service stop valve (mandatory)  
16  
5
4
4
12. temperature gauge  
(recommended)  
5
1
4
14. hot water draw-off points  
A
C
15. expansion valve (mandatory)  
16. expansion vessel (mandatory)  
15  
9
D
17. 3-way aeration valve  
(recommended)  
10  
18. water tank  
19. float valve  
A. cold water supply  
B. hot water supply  
C. circulation pipe  
D. gas supply  
VENTED  
H
A
19  
E
4
E. overflow pipe  
H. overflow pipe  
18  
17  
12  
B
11  
14  
3
4
14  
14  
7
5
4
C
4
6 5  
4
C
4
9
D
10  
IMD-0466 R0  
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6
Draining  
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Some service activities require the appliance to be drained. The procedure is as  
follows:  
6.1 Draining unvented  
installations  
1. Shut down the appliance by setting the ON/OFF switch on the control panel  
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.  
3. Shut off the gas supply (10).  
4. Close the stop valve (11) in the hot water pipe.  
5. Close the supply valve of the cold water supply (A).  
6. Open the drain valve (9).  
7. Bleed the appliance (or installation) so that it drains completely.  
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6.2 Draining vented  
installations  
Some service activities require the appliance to be drained. The procedure is as  
follows:  
1. Shut down the appliance by setting the ON/OFF switch on the control panel  
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.  
3. Shut off the gas supply (10).  
4. Close the stop valve (11) in the hot water pipe.  
5. Close the stop valve (4) between the cold water head tank and the cold  
water inlet.  
6. Open the drain valve (9).  
7. Bleed the appliance (or installation) so that it drains completely.  
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Draining  
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7 The control panel  
Icons and their meaning  
7.1 Introduction  
Topics covered in this chapter, in sequence:  
Name  
Explanation  
ON/OFF  
switch  
'ON mode' / 'OFF  
mode'  
Temperature  
control  
Set water  
temperature  
(Tset)  
Reset button  
Reset burner  
control  
7.2 Control panel  
This figure shows the control panel.  
Power LED  
Error LED  
Power indicator  
for burner control  
The control panel  
Burner control  
lockout  
7.4 ON/OFF switch  
The ON/OFF switch sets the appliance in ON mode or  
OFF mode. In OFF mode the appliance is still  
electrically live. This ensures that the frost protection  
is active.  
Note  
To electrically isolate the appliance, you must use  
the isolator between the appliance and the mains  
power supply.  
7.5 Control thermostat  
Use the rotary knob of the control thermostat to set the  
desired water temperature between ± 40°C and ±  
70°C. The range is continuous and is labeled 1  
through 4. The table shows the temperatures  
coresponding to the numbers on the knob.  
The control panel comprises:  
an ON/OFF switch  
a reset button  
Temperature settings  
a control thermostat with rotary knob  
two status LEDs  
Position  
Temperature  
± 40°C  
1
2
3
4
7.3 Explanation of icons  
± 50°C  
The table explains the meanings of the icons.  
± 60°C  
± 70°C  
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The control panel  
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7.6 Burner control reset button  
An error can cause the burner control to lock out.  
When this happens, the red LED on the control panel  
will illuminate. After eliminating the cause of the error,  
you can reset the appliance using the reset button.  
Note  
Before resetting, always eliminate the cause of the  
error.  
The appliance's error conditions (8.3 "Error  
conditions") and how to resolve them are described in  
the error condition summary (11 "Troubleshooting").  
7.7 Flue gas thermostat reset button  
A malfunction in the flue gas discharge, e.g. a  
blockage in the chimney, can lead to the flue gas  
thermostat locking out. This state is evident when the  
push button on the flue gas thermostat has been  
activated (refer to the figure). Once the cause has  
been removed, and the sensor has cooled down  
sufficiently, press this push button to reset (if the  
sensor is not sufficiently cooled down, the flue gas  
thermostat will immediately lock out again). The  
appliance will then automatically start up again, if  
there is a demand. If this is not the case, please  
consult the error condition  
Note  
The draught diverter may be hot.  
Figure: Flue gas thermostat reset button  
IMD-0140 R2  
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8 Status of the  
appliance  
When this happens, the red LED on the control  
8.1 Introduction  
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  
Topics covered in this chapter:  
8.2 Operating modes  
Blocking errors  
When running, the appliance has three basic  
operating modes, namely:  
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  
ELECTRICALLY ISOLATED  
In this mode, the appliance is off and no  
components are live. The isolator (switch between  
the appliance and the mains power supply) is off.  
On the control panel:  
These errors disappear automatically once the  
cause of the error has been removed, after which  
the appliance resumes operation by itself.  
-
-
the ON/OFF switch is at position 0;  
the green light is dimmed.  
The cause of the error cannot be seen on the control  
panel. For a detailed overview of error conditions,  
please refer to the error tables (11 "Troubleshooting").  
OFF  
In this mode, the frost protection is activated. The  
isolator is at position I. On the control panel:  
If, as end-user, you find the appliance in an error  
condition, you may attempt to restart the appliance by  
pressing the reset button once. However, if the error  
returns or occurs several times in a short time, you  
must contact your service and maintenance engineer.  
-
the ON/OFF switch is at position 0;  
the green light is lit.  
-
ON  
In this mode, the appliance continuously responds  
to the heat demand. On the control panel:  
-
-
the ON/OFF switch is at position I;  
the water temperature can be set using the  
rotary knob of the control  
-
the green light is lit.  
8.3 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  
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Status of the appliance  
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9 Starting and running  
The entire cycle is explained in the example below.  
9.1 Introduction  
Topics covered in this chapter:  
Note  
The cycle has the same steps when frost  
protection is activated.  
9.2 Starting the appliance  
Start the appliance as follows:  
1. Fill the appliance (5 "Filling").  
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. 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.  
2. Following demand, the wait period starts. This wait  
ensures that the ignition is safe. The wait period  
lasts approximately 15 seconds.  
4. Put the appliance in ON mode by setting the  
3. Once the wait period has elapsed (there is audible  
‘clicking’ of the relay in the burner control), the  
PRE-GLOW starts.  
ON/OFFswitch on the control panel to position I.  
5. Using the control thermostat (7.5 "Control  
thermostat"), set the desired water temperature.  
4. After about 12 seconds (pre)glowing, the gas  
control opens and ignition takes place.  
If there is a heat demand, the appliance will run  
through the heating cycle (9.3 "The appliance's  
5. After ignition, the flame is detected and the  
appliance will be running. This means that actual  
heating has started.  
9.3 The appliance's heating cycle  
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.  
The appliance's heating cycle is activated as soon as  
the measured water temperature  
) falls below  
(Twater  
the threshold value (T ). This threshold value  
set  
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).  
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.  
The heating cycle runs successively through the  
following states:  
1. HEAT DEMAND;  
2. WAIT;  
3. PRE-GLOW;  
4. IGNITION;  
5. RUNNING;  
6. WAIT.  
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Starting and running  
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10 Shutting down  
10.1 Introduction  
Topics covered in this chapter:  
10.2 Shutting 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  
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.  
10.4 Shutting 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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10  
Shutting down  
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11 Troubleshooting  
This chapter deals with the following problems with the appliance:  
11.1 Introduction  
Gas smell.  
Water leakage.  
Explosive ignition.  
Poor flame profile.  
No hot water.  
Insufficient hot water.  
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:  
11.2 Error conditions  
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  
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  
Gas smell  
Cause  
Precautions  
Warning  
Comment  
Note  
Gas leak  
Close the main gas valve immediately.  
Contact your installation engineer or local gas company  
immediately.  
Warning  
Do not operate any switches.  
Warning  
No naked flames.  
Warning  
Ventilate the boiler room.  
Water leakage  
Leakage from a water Tighten the threaded connection  
connection (threaded)  
If the leak persists, consult your installation engineer  
Leakage from another Trace the leak  
nearby water appliance  
or pipe segment  
Leakage from the  
appliance's tank  
Consult the supplier and/or manufacturer  
Condensation  
Before drawing (too much) tap water, wait until the water in the  
boiler has reached the set temperature.  
Explosive ignition  
Poor flame profile  
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  
pressure  
pressure")  
Contaminated burner  
Contaminated orifice  
Clean the burner(s) (12.4.2 "Clean the burner(s)")  
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  
Red LED ON  
No supply voltage  
present  
1. Check if the isolator is ON.  
See the ADM electrical diagram (14 "Appendices")  
If the error cannot be rectified, contact your installation engineer  
When a demand is detected, the appliance will restart  
Comment  
2. Check whether there is power to the isolator  
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  
Red LED OFF  
Blockage in the flue gas 1. Trace the blockage  
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  
Green LED ON and  
Red LED ON  
There are three possible causes for this error. In order to determine the cause, you must  
cause the error to appear again:  
If the error cannot be resolved or is persistent, contact your  
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  
installation engineer  
three unsuccessful  
start attempts in a row  
-
-
Check that the gas valve is open  
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  
installation engineer  
The safety thermostat  
has cut out  
-
-
-
-
Reset the appliance  
Check whether the control thermostat is working  
Check whether the high-limit thermostat 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 (T ) is too low value  
set  
Hot water supply is  
used up  
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,  
isolate the appliance from the mains (10.3 "Isolating the appliance  
from the mains"), shut off the manual gas valve and alert your  
installation engineer.  
heat up.  
2. If this error persists, check whether the high-limit thermostat is  
switching. If this is the case, check that the circulation and/or top  
to bottom circulation pump are working.  
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12 Performing  
maintenance  
Caution  
12.1 Introduction  
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.  
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:  
12.2 Preparation for  
maintenance  
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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Performing maintenance  
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12.3 Water-side  
maintenance  
12.3.1 Introduction  
The following steps must be carried out on the water side:  
12.3.2 Checking 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-fit the 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-fit the protective cover.  
12.3.3 Descaling 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.  
2
1
5
7
6
3
4
IMD-0235 R2  
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
3
6
5
4
2
IMD-0282 R1  
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.  
12.4 Gas-side  
maintenance  
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12.4.1 Introduction  
The following steps must be carried out on the gas side:  
12.4.2 Clean the burner(s)  
1. Detach the burner(s)  
2. Remove all contamination present on the burner(s).  
3. Fit the burner(s)  
12.4.3 Clean the orifice(s)  
1. Detach the orifice(s)  
2. Remove all contamination present in the orifice(s).  
3. Fit the orifice(s)  
12.4.4 Checking 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-fit the 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-fit the protective cover.  
To finalise the maintenance, carry out the following steps:  
1. Fill the appliance (5 "Filling").  
12.5 Finalising  
maintenance  
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.  
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.  
13.1 General warranty  
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-lined steel 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.  
The warranty set out in article 1 and 2 will apply solely under the following  
conditions:  
13.3 Conditions for  
Installation and use  
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-corrosive atmosphere 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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Warranty (certificate)  
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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;  
13.4 Exclusions  
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-earth ions) of the water being less than 1.00  
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.  
13.5 Scope of the  
warranty  
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.  
13.6 Claims  
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.  
13.7 Obligations of A.O.  
Smith  
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-lined steel tank  
of) a (replacement) water heater that it has supplied.  
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14 Appendices  
This section gives the electrical diagrams for:  
14.1 Introduction  
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14.2 Electrical Diagrams  
ADM  
14.2.1 Electrical diagram for ADM 40 to 135 natural gas and 40 to 115 LPG  
230V AC  
50Hz  
1
2
3
4
L
N
A
4
4
1
2
3
L
N
L
L
1
2
3
4
5
6
3
1
2
4
4
B
C
D
E
F
FUSE  
F1  
4
4
4
1
G
H
J
HOT  
R1  
SUR-  
FACE  
G
V
1
M
A
X
T
L
G
N
O
N
C
L" N  
H
N
N
N
P
L'  
I
3
3
0
I
1
1
2
4
1
2
4
4
4
3
3
3
3
4
4
1
L
1
4
N
L
N
M
24V  
11  
12  
4
1
2
3
4
4
4
1
N
N
L
L
I
K
7
8
9
10 11 12  
3
2
3
4
4
4
1
4
11  
12  
4
L
3
0305471 R1  
N
P
O
1 = brown, 2 = blue, 3 = yellow/green, 4 = black, 5 = white (flat cable)  
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TERMINAL STRIP CONNECTIONS:  
Earth  
N
Neutral  
1
L
L
L
Phase input of controller  
Phase input of flue gas thermostat  
Phase output of flue gas thermostat  
2
3
COMPONENTS:  
A
B
C
D
E
F
Two-pole isolator switch  
Flue gas thermostat  
"Error" signalling  
"Operational" signalling  
RESET button  
Burner control  
G
H
J
Control thermostat  
Frost thermostat  
Controller 0/I switch  
Safety thermostat  
High-limit thermostat  
Extra error signal connection  
Gas control  
K
L
M
N
O
P
Hot surface igniter  
Flame probe  
CONTROLLER CONNECTIONS:  
N1  
Neutral  
Earth  
L'  
Phase input of controller  
L"  
Phase output to safety circuit and thermostat circuit  
Phase input of thermostat circuit  
Phase output to gas control  
Phase input to safety thermostat  
Phase output to hot surface igniter  
Detection of ionisation signal  
Normally open port of the extra error sensor  
Phase input of extra error sensor  
Normally closed port of the extra error sensor  
Fuse  
TH  
GV1  
MAX  
LG  
I
NO  
P
NC  
F1  
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Appendices  
is  
14.2.2 Electrical diagram 135 - LP gas  
230V AC  
50Hz  
1
2
3
4
L
N
A
2
4
4
1
1
2
3
4
5
1
L
B
L3  
N
2
L2  
1
3
4
4
C
D
E
F
FUSE  
F1  
4
4
4
1
HOT  
SUR-  
FACE  
R1  
G
V
1
M
A
X
G
H
J
T
L
N
O
N
C
L
L"  
N
H
N
N
N
G
P
I
3
3
0
I
1
1
2
4
1
2
4
4
4
3
3
3
3
4
4
1
4
L
2
3
1
4
N
L
N
M
11  
12  
24V  
4
1
2
3
4
4
1
4
K
1
2
3
4
5
6
3
12  
4
11  
4
1
1
4
4
L
A
1
A
1
15  
15  
3
L1 L1 L2 L2  
T
1
T
2
L2 N L3  
N
A
2
A2  
18 16  
18 16  
R
R
4
2
4
2
2
4
4
2
4
3
1
4
3
1
2
3
4
5
6
7
8
9
P
Q
N
O
0304481 R1  
1 = brown, 2 = blue, 3 = yellow/green, 4 = black, 5 = white (flat cable)  
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TERMINAL STRIP CONNECTIONS:  
Earth  
N
Neutral  
1
L
L
L
Phase input of controller  
Phase input of flue gas thermostat  
Phase output of flue gas thermostat  
2
3
COMPONENTS:  
A
B
C
D
E
F
Two-pole isolator switch  
Flue gas thermostat  
"Error" signalling  
"Operational" signalling  
RESET button  
Burner control  
G
H
J
Control thermostat  
Frost thermostat  
Controller 0/I switch  
Safety thermostat  
High-limit thermostat  
Extra error signal connection  
Gas control  
K
L
M
N
O
P
Q
R
Hot surface igniter  
Flame probe  
High-low control  
Timer  
CONTROLLER CONNECTIONS:  
N1  
Neutral  
Earth  
L'  
Phase input of controller  
L"  
Phase output to safety circuit and thermostat circuit  
Phase input of thermostat circuit  
Phase output to gas control  
Phase input to safety thermostat  
Phase output to hot surface igniter  
Detection of ionisation signal  
Normally open port of the extra error sensor  
Phase input of extra error sensor  
Normally closed port of the extra error sensor  
Fuse  
TH  
GV1  
MAX  
LG  
I
NO  
P
NC  
F1  
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Appendices  
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Index  
A
M
maintenance  
B
C
connect  
O
P
R
S
D
E
F
symbol  
T
G
to shut down  
H
I
U
icons  
W
water  
L
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Index  
Instruction manual ADM  
0306 132  
4.0 UK  
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