Eco Hometec EC 38kW Assembly Instructions

eco hometec
Variable Controlled Output (VCO)
Solar Compatible jjjjj
Gas Condensing Boilers
EC 16, 23, 31 and 38kW
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IN NS ST TA AL LL LA AT TI IO ON N & &
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IN NS ST TR RU UC CT TI IO ON NS S
PLEASE LEAVE WITH THE END USER

eco hometec
Unit 11E
Carcroft Enterprise Park
Carcroft
Doncaster
DN6 8DD
Tel. [phone]
Fax. [phone]
e.mail. [email protected]
http://www.eco-hometec.co.uk
D:\MAY_2001_All_Manuals\1538INST.DOC\30 June 2002
eco hometec has a policy of continuous improvement and reserves the right to change any
specification without notice. Your statutory rights are not affected.
eco hometec is committed to design, develop and produce environmentally friendly appliances
for both domestic and commercial applications
Page 2 eco hometec (uk) ltd.

Contents
1. Why choose eco hometec? ....................... 6
2. Safety Considerations ............................... 7
3. Symbols..................................................... 7
3.1 Gas Safety................................................7
4. Electrical Supply........................................ 7
5. Terms of Warranty..................................... 8
6. Commissioning Certificate......................... 8
6.1 Requirements for the system quality .......8
7. Existing Installations.................................. 8
7.1 Considerations prior to Connection. .........8
7.2 Expansion Vessels ...................................9
8. Introduction................................................ 9
8.1 Variable Controlled Output .......................9
8.2 Emissions. ................................................9
8.3 PPS Plastic Flue System..........................9
8.4 Approvals .................................................9
8.5 Additional Features...................................9
9. Description of Appliances........................ 10
9.1 EC 16,23,31 and 38 H ............................10
9.2 EC 16,23,31 and 38 HS..........................10
9.3 EC 16,23,31 and 38 S ............................10
10. Technical Information .............................. 11
11. Main Component Specification................ 13
11.1 Head Height of the Central Heating Circuit.
13
11.2 Air Fan Details........................................13
11.3 Gas Control Valve. .................................13
12. Unpacking & Items Supplied ................... 14
13. Accessories ............................................. 14
14. Operation................................................. 15
14.1 Variable Controlled Output .....................15
14.2 Variable pump ........................................15
14.3 Frost Protection ......................................15
14.4 Year Long Protection..............................15
15. Siting the Appliance................................. 15
15.1 Timber Framed Dwellings.......................16
16. Hydraulic Connections ........................... 16
16.1 First Fixing Pipe-work .............................16
16.2 Type ‘H’ Connections .............................16
16.3 Type ’HS’ Connections. ..........................16
16.4 ‘S’ Connections. .....................................17
16.5 Clearances .............................................17
16.6 Checks Before Siting ..............................17
16.7 Fixing the boiler. .....................................17
16.8 Removing The Casing ............................17
17. Flues and Ventilation............................... 18
17.1 Maximum Flue Lengths ..........................18
17.2 Available Flue Components....................20
17.3 Pluming ..................................................21
17.4 Condensate in the Flue ..........................21
17.5 Flueing Options ......................................21
17.6 Installing a Concentric Flue ....................21
17.7 Vertical flue Installations.........................23
17.8 Modular Installations...............................23
17.9 Fan Flued Terminal Positions .................26
18. Gas Supply...............................................26
18.1 Gas Supply.............................................26
18.2 LPG Gas Supply.....................................27
18.3 Setting The Gas Type.............................27
18.4 Conversion to LPG .................................27
19. Air Supply .................................................28
19.1 Concentric Flue ......................................28
19.2 Conventionally Flue ................................28
19.3 Compartment Ventilation ........................28
20. Hydraulic Requirements...........................29
20.1 Expansion Vessel ...................................29
20.2 Hydraulic Resistance..............................30
20.3 Condensate Drain...................................30
20.4 System By-Pass .....................................30
21. Electrical Connections..............................33
22. Heating Control Options...........................33
22.1 240 Volt Connections .............................33
22.2 Low Voltage Connections.......................34
22.3 Built-in clock ...........................................34
23. Boiler Control panel..................................34
24. Boiler Control Panel .................................35
24.1 System water pressure gauge................35
24.2 On / off switch.........................................35
24.3 Lcd control display..................................35
24.4 Menu - reset button ................................35
24.5 Summer winter button ............................35
24.6 Engineers button ....................................35
24.7 Test button..............................................36
24.8 General...................................................36
25. Menu options............................................36
25.1 Party .......................................................36
26. User programming ...................................36
26.1 Hot Water Temperature..........................36
26.2 Day temperature function .......................36
26.3 Time/day function ...................................36
26.4 Setting the ch timer.................................36
26.5 Setting the HW timer ..............................38
26.6 Setting MR03 times ................................38
26.7 Night-time lower 0oc. ..............................38
26.8 Holiday function ......................................38
26.9 Installer...................................................38
27. Installer Programming ..............................39
28. Outside Temperature Control...................40
28.1 Flow Temperature at + 20°C ..................40
28.2 Outside Temp. Control at - 1°C ..............41
EC 16~38 Installation Manual page 3

28.3 Minimum pump speed ............................41
28.4 Maximum pump speed ...........................41
28.5 Flow temperature secondary circuit........ 41
28.6 Service counter ......................................41
28.7 Pump continuous.................................... 41
28.8 Eco/eco+ ................................................41
28.9 Post running of pump after HW .............. 41
28.10 Post running of pump after CH ............... 41
28.11 Minimum DHW Capacity ........................ 42
28.12 Maximum DHW Capacity ....................... 42
28.13 Maximum CH capacity ........................... 42
28.14 Function Setting .....................................43
29. Commissioning ........................................47
29.1 Electrical Checks.................................... 47
29.2 Gas Supply.............................................47
29.3 Connection to Pipe-work ........................ 47
29.4 Water Treatment .................................... 47
29.5 Flushing System Pipe-work .................... 47
29.6 Filling and Venting the System ............... 47
30. Combustion Ratio ....................................48
30.1 Commissioning NG and LPG .................48
31. Setting the Maximum CO2 Value .............48
31.1 Flue System Check ................................49
31.2 STB Test Button (Green)........................ 49
32. Diagnostics ..............................................49
32.1 Control panel ..........................................49
33. Fault Finding. ...........................................50
34. Handing the boiler over............................ 54
34.1 Customer Familiarisation........................ 54
35. Annual Servicing.....................................54
35.1 Service Inspection ..................................54
35.2 Pre-preventative Maintenance................ 55
35.3 Service records ......................................55
36. Decommissioning the boiler..................... 55
37. User Instructions ......................................56
37.1 Annual Servicing. ..................................56
37.2 Decommissioning the boiler. ..................56
37.3 Built-in clock ...........................................56
37.4 Boiler Control Panel ...............................57
37.5 System water pressure........................... 57
37.6 On / off switch.........................................57
37.7 Lcd control display.................................. 57
37.8 Menu - reset button ................................57
37.9 Summer winter button ............................57
37.10 Engineers button ....................................57
37.11 Test button .............................................57
37.12 General ..................................................57
38. Programming Menu options.....................58
38.1 Party....................................................... 58
38.2 Hot Water Temperature..........................58
38.3 Day temperature function .......................58
38.4 Time/day function ...................................58
38.5 Setting the ch timer ................................58
38.6 Setting the hw timer................................59
38.7 Setting MR03 times ................................60
38.8 Night-time lower 0oc ...............................60
38.9 Holiday function......................................60
38.10 Installer...................................................60
Figure 1 Overall Dimensions mm. .................... 12
Figure 2 Bottom View Dimensions mm. ...........12
Figure 3 Top View Dimensions mm .................13
Figure 4 Pump Head Height.............................13
Figure 5 Air Fan Curve..................................... 13
Figure 6 Gas Valve ..........................................13
Figure 7 Pipe-work Layouts ............................16
Figure 8 Minimum Clearances .........................17
Figure 9 Removing the Casing.........................17
Figure 10 Fixing Dimensions.............................. 18
Figure 11 Flue Design........................................19
Figure 12 Thermal Lift ........................................ 20
Figure 13 Flue Preparation ................................21
Figure 14 Dimensions for cutting flue hole .........22
Figure 15 Wall Terminal .....................................22
Figure 16 Vertical Wall Terminal ........................23
Figure 17 Vertical Flue Application.....................23
Figure 18 Modular Installation............................23
Figure 19 Vertical Roof Terminals......................24
Figure 20 Concentric flue fittings........................ 25
Figure 21 Concentric 80mm adaptor..................25
Figure 22 80mm Flue Tubes ..............................25
Figure 23 Fan Flued Terminal Positions ............26
Figure 24 H Type Hydraulic system design........31
Figure 25 HS Type Hydraulic system design ..... 31
Figure 26 S Type Combi Hydraulic system design
32
Figure 27 Electrical Connections........................32
Figure 28 Connecting to the Mains ....................33
Figure 29 Boiler Control panel ...........................34
Figure 30 Weather Compensation .....................40
Figure 31 O/T Ctrl Flow temp 85oC. ...................40
Figure 32 O/T Ctrl Flow temp 70oC ....................40
Figure 33 O/T Ctrl Flow temp 50oC ....................40
Figure 34 Internal Wiring.................................... 46
Figure 35 Gas valve adjustments.......................49
Figure 36 Boiler Control panel ...........................56
Table 1 Dimensions & Connections ....................11
Table 2 Heating Specifications ............................ 11
Table 3 Capacities & Weights .............................11
Table 4 Hot Water Specifications ........................12
Table 5 Connection Values .................................12
Table 6 Minimum Clearances.............................. 17
Table 7 Flue Resistance......................................19
Table 8 Flue Terminal Positions. .........................26
Table 9 Ventilation...............................................28
Table 10 Expansion Vessel Req.......................29
Table 11 System Contents................................30
Table 12 Programming Functions .....................39
Table 13 Installer Functions..............................39
Table 14 Minimum & Maximum fan speeds ......48
Table 15 CO2Outputs ......................................49
Table 16 LCD Display ‘NON FLASHING’.........50
Table 17 LCD ‘NON FLASHING’ burner off .....50
Table 18 Fault Display FLASHING ...................51
Table 19 Non Display Faults and Errors ...........51
Table 20 Reasons For Error Display.................52
Page 4 eco hometec (uk) ltd.

HEALTH & SAFETY
INFORMATION FOR THE INSTALLER AND SERVICE
ENGINEER
Under the current issue of the Consumer Protection Act and the Health and Safety at Work Act
it is a requirement to provide information on substances hazardous to health (COSSH
Regulations).
eco hometec takes every reasonable care to ensure that these products are designed and
constructed to meet these general safety requirements, when properly used and installed. To
fulfil this requirement each boiler is comprehensively tested before despatch.
When working on the appliance it is the Users/Installers responsibility to ensure that any
necessary personal protective clothing or equipment is worn appropriate to parts that could be
considered as being hazardous to health and Safety.
This appliance may contain some of the items below.
INSULATION AND SEALS
Glass Rope, Mineral Wool, Insulation Pads, Ceramic Fibre, Glass Insulation.
may be harmful if inhaled
may be irritating to the skin, eyes, nose or throat
When handling avoid inhalation and contact with eyes.
Use (disposable) gloves, face masks and eye protection.
After handling, wash hands and other exposed parts.
When disposing, reduce dust with water spray, ensure parts are securely wrapped.
GLUES, SEALANTS & PAINT
Glues, Sealant and Paints used in the product present no known hazards when used in the
manner for which they are intended.
EC 16~38 Installation Manual page 5

1. Why choose eco hometec?
Features and Benefits at a glance
Wall mounted ultra high efficiency gas boilers
Suitable for installation into existing systems, new radiator and/or
underfloor installations, can also be used with solar heating systems
Emissions levels are 90% lower than the “Blue Angel” standards and
significantly less than the levels specified in the “Swiss Clean Air Act”
and the “Hamburg Development Program" the World’s most
stringent regulations. (NOx 20mg\kWh CO 14mg\kWh)
Long life Austenitic stainless steel heat exchanger
Energy saving modulating fan
Energy saving modulating burner
Energy saving modulating pump
Energy saving modulating system water temperature
Plug in components for fast and cost effective servicing
Corrosion free PPS plastic flue tubes and fittings offering ease of
siting
Data logging via PC for analysing, performance, operating times,
temperatures and for fine-tuning
Built in digital Weather Compensating comfort controller
Built in digital central heating and hot water time clock controller
HS specification with dual flow temperatures for under floor heating
systems
The most complete energy efficient home heating appliance available
Guarantee periods Heat Exchanger 5 years other components 2
years
Free help with technical, design and installation issues
Page 6 eco hometec (uk) ltd.

2. Safety Considerations
The installation of this appliance must be
carried out by a competent person in
accordance with the relevant Gas Safety
Regulations (as amended), Building
Regulations, Model Water Bylaws and the
Building Standards (Scotland) Regulations.
eco hometec shall not be responsible for
any damage or loss resulting from failure to
carefully observe the instructions given.
The boiler, except for commissioning
purposes, should not be left operating
without the casing being attached and
firmly secured
3. Symbols
In this manual the following symbols are
used.
This symbol is used to indicate points
that are important, to ensure compliance
with safety regulations or to facilitate
installation or operation.
This symbol !is used to highlight points
that must be observed for the safety of
yourself and others.
3.1 Gas Safety
All gas appliances must, by law, be installed
by competent persons, e.g. members of
CORGI, in accordance with the Gas Safety
Regulations. Failure to install appliances
correctly could lead to prosecution
!It is in your own interest and that of safety
to ensure that the law is complied with.
Installer training courses are available for
CORGI registered installers. Please contact
eco hometec for more information.
This installation manual contains all the
necessary information required to install and
commission the EC VCO 16, 23, 31 and
38kW range of boilers.
Please read this manual thoroughly before
commencing installation. The installation
must be carried out in accordance with the
manual otherwise the warranty will be void.
Use only original parts for service and
maintenance.
After installation ensure the manual is kept
close to the boiler and available for
reference purposes.
The installation should also be in
accordance with current editions and
comply with the recommendations of the
following British Standard Codes of
Practice.
CP.331.3 Low pressure installation pipes.
BS.6798 Boilers of rated output not
exceeding 60kW.
BS.5546 Installation of gas hot water
supplies for domestic purposes.
BS. 5449.1 Forced circulation hot water
systems.
BS.5440.1 Flues (for gas appliances of
rated input not exceeding 60kW).
BS.5440.2 Air supply (for gas appliances
of rated input not exceeding 60kW).
4. Electrical Supply
The wiring must comply with the current
I.E.E. Wiring Regulations.
The Health and Safety Document No. 635
and the Electricity at Work Regulations
1989 must be followed where applicable.
The boilers are supplied for 230V +10/-15%
50Hz operation. The method of connection
to the mains electrical supply MUST
facilitate complete electrical isolation of the
boiler. This may be achieved using a readily
accessible 3 amp fused double pole switch
clearly labelled.
THESE APPLIANCES MUST BE
EARTHED.
IMPORTANT This boiler is an EC
Certified Appliance and must not be
modified or installed in any way contrary to
these ‘Installation and Servicing
Instructions’.
EC 16~38 Installation Manual page 7

The manufacturers instructions must NOT
be taken in any way as over-riding statutory
obligations.
5. Terms of Warranty
Damages to the appliance resulting from the
following causes will invalidate the
warranty:
incorrect or unsuitable use of the boiler
Please ring the eco hometec technical
department for advice on suitability
faulty installation or servicing by the
purchaser or third parties
normal wear and tear
failure to maintain or service appliance in
compliance with this manual
in the case of chemical, electrochemical or
electric influences in as much as the fault
cannot be attributed to the manufacturer
failure to observe installation and/or
operating instructions
effects of fitting, servicing or repairing parts
with non-genuine origin parts (e.g. non-
genuine boiler circuit control)
damage as a result of dust or other foreign
matter being sucked into the burner
influence of noxious vapours
installation and operation in inappropriate
rooms (e.g. in washrooms, launderettes,
swimming pools or hobby rooms)
continued use when apparatus is defective
or requires servicing
in the case of inappropriate alterations or
renovation work by the purchaser or by third
parties
oxygen corrosion, particularly when not
using diffusion-tight plastic pipes in floor
heating systems
corrosion as a result of inadequate system
water treatment.
interim building conditions with unregulated
heating operation (manual operation without
boiler protection)
interim building conditions with dust-polluted
combustion air
6. Commissioning Certificate
The warranty is only recognised if a
completed commissioning certificate
(operational test form) is at hand (send in by
fax or post), as well as an
acknowledgement by eco hometec (u.k.) ltd.
6.1 Requirements for the system
quality
Before commissioning the appliance it is
essential to clean the installation in
accordance with BS 7593: 1992
Installation of in-line strainers is obligatory.
As a protection from corrosion and
impurities the water additive Fernox MB1
has to be used and maintained (4%).
7. Existing Installations
7.1 Considerations prior to Connection.
IMPORTANT 
All eco hometec boilers are low water
content units. In order to protect and
prolong the working life of the appliance,
it is important the general condition of
older systems is carefully considered.
When connecting to an existing
installation it is important that system
deposits are removed and are not
allowed to contaminate boiler.
This involves the application of a cleanser
and allowing it to circulate around the whole
system for a specified time, then flushing to
drain.
 Consider high pressure flushing to
remove all debris in badly contaminated
systems.
It is important to select the cleanser
appropriate to the installation i.e. for a new
installation, or for an existing installation.
It is good practice to clean the system prior
to the installation of the new boiler.
The removal of debris, flux residue, grease,
metal swarf etc. from new systems and any
black magnetic iron oxide sludge and lime
scale from old systems is essential.
In-line strainers must be fitted to the
return water connections for full protection.
All installations must be treated with Fernox
MB1 at a concentration of 4%.
Page 8 eco hometec (uk) ltd.

If plastic pipes are used to connect the
boiler to radiators or under floor heating,
it is essential that only those types of
plastic pipe that incorporate an oxygen
diffusion barrier be used. If such pipes
are not used, the eco hometec guarantee
will become null and void.
7.2 Expansion Vessels
The EC VCO models are designed for
connection to a fully pumped sealed heating
circuit only.
Depending on specification chosen the
appliance may be fitted with a 10 litre
expansion vessel
An additional suitable sized expansion
vessel may be required to accommodate
volume change (expansion of water) when
heated up to maximum operational
temperature on larger capacity systems.
Select an expansion vessel that matches
the volume of the CH system and the static
pressure. Expansion vessels should be
connected to the system at a point close to
the pump inlet in order to maintain positive
pressure throughout the system.
Installation should comply with BS7074 part
1 and BS5449.
8. Introduction
The boiler features the very latest in
technology. Developed around an
innovative back panel the boiler uses laser
welded waterways to interconnect the
boilers main components.
To facilitate ease of servicing the high grade
austenitic stainless steel coiled heat
exchanger and other major components are
simply plugged into the panel.
The boilers incorporate the unique eco
hometec premixing, fully modulating, radiant
gas burner, 3 bar pressure relief valve,
manometer and circulating pump.
8.1 Variable Controlled Output
Unlike most boilers that simply switch on
and off the boiler incorporates an integral
compensating and modulating digital
controller that automatically adjusts the
boilers output depending on system load
requirements.
This feature, Variable Controlled Output,
(VCO) is the very latest from eco hometec
in condensing technology and ensures the
boiler maintains optimum efficiencies even
when operating at part load.
8.2 Emissions.
A further benefit of this very accurate
combustion process is the dramatic
reduction of the harmful emissions NOx and
CO.
The emissions exceed the “BlueAngel”
standards by more than 90% and are also
significantly less than the standards
specified in the “Swiss Clean Air Act” and
the “Hamburg Development Program" the
World’s most stringent regulations. (NOx
20mg\kWh CO 14mg\kWh).
8.3 PPS Plastic Flue System
Due to the extremely low temperature flue
gases the boiler may be flued using the
lightweight and corrosion resistant eco
hometec PPS plastic flue system.
8.4 Approvals
The unit has been approved according to
the European standards (CE) and the
requirements for cleaner combustion (RAL
UZ61)
8.5 Additional Features
A unique SPIRANOX corrosion resistant
stainless steel condensate heat exchanger.
Integral sensors (PTC) for monitoring flow
and return water temperatures.
3 way switching valve and facilities for
connection to an eco hometec DHW storage
module or similar.
Computer controlled combustion analysis
with built in fault diagnosis facility. These
readings can be down loaded onto a PC by
using the RS 2323 interface cable and
software available from eco hometec.
EC 16~38 Installation Manual page 9

9. Description of Appliances
9.1 EC 16,23,31 and 38 H
The ‘H’ model is suitable for a central
heating system with hot water output
controlled using a 3 way divertor valve
(spring return to heating).
The appliance produces a low temperature
output for under-floor heating or a
fixed/variable temperature output for
connection to radiators. Flow temperature
to hot water cylinder can be set as required
(max. 85OC)
Hot water cylinders must be double feed
indirect and to aid efficiency and fast
recovery times (all appliances are hot water
priority) should be of the high recovery type.
Recommended minimum coil capacity
25kW.
The unit has a variable capacity of 20 to
100%, while the maximum capacity can be
set and adapted to the capacity of the CH
system.
9.2 EC 16,23,31 and 38 HS
The ‘HS’ range are higher specification.
With its 4 x 22mm connections it offers a
low temperature output, typically 55OC, for
under-floor heating or a fixed/variable
temperature output for connection to
radiators.
Dsspite the low boiler flow
temperatures feature ALL low temperature
under floor installations require an
obligatory mixing valve installing as part of
the system controls.
Flow temperature to hot water cylinder can
be set as required (max. 85OC)
The unit has a variable capacity of 20 to
100%, while the maximum capacity can be
set and adapted to the capacity of the CH
system.
Hot water cylinders must be double feed
indirect and to aid efficiency and fast
recovery times (all appliances are hot water
priority) should be of the high recovery type.
Recommended minimum coil capacity
25kW.
9.3 EC 16,23,31 and 38 S
This unit has a built-in heat primary heat
exchanger and Hot water production is
continuous.
The unit has a variable capacity of 20 to
100%, while the maximum capacity can be
set and adapted to the capacity of the CH
system.
EC38S Combi with integral 10Litre store
This appliance requires an expansion
vessel and a 3 bar pressure relied valve
fitting to the system
Page 10 eco hometec (uk) ltd.

10. Technical Information
T
Ta ab bl le e 1 1 D Di im me en ns si io on ns s & & C Co on nn ne ec ct ti io on ns s
Product Identification Number CE ~ 0085AR0057
Appliance Category 2ELL3B/P
Dimensions (H x W x D) 950mm x 458mm x 355mm
Heating Circuit Connections 22mm
Gas Connection 15mm
Condense Drain Connection ¾ BSP
Air Supply/Flue Connections 125/80mm
T
Ta ab bl le e 2 2 H He ea at ti in ng g S Sp pe ec ci if fi ic ca at ti io on ns s
Models H, HS and S EC16 EC23 EC31 EC38
Maximum Rated Input kW 15 22 28 36
Nominal Output To Heating 80/600C kW 14.3 21.4 28.4 35.1
Minimum Output To Heating 80/600C kW 2.5 3.1 4.5 6.0
Nominal Output To Heating 50/300C kW 15.8 23.1 30.7 38.0
Minimum Output To Heating 50/300C kW 3.1 3.6 5.1 6.8
CO2 %content at max/min load CO2 % 9 9 9 9
Dew Point of Flue Gases 00C 52 52 52 52
Flue Gas Temp @ 80/600C (Amb 200C) 00C 75 75 75 75
* Maximum Flue Resistance Pa 100 100 100 100
pH value of condensate water PH 4-5.5 4-5.5 4-5.5 4-5.5
Pump Pressure @ 30kW and 20K Bar 0.2 0.15 0.1 0.075
Maximum Flow Temperature 00C 85 85 85 85
Min/Max filling pressure bar 0.5 - 3.0 0.5 - 3.0 0.5 - 3.0 0.5 –3.0
**Efficiency @ 75/600C % 104 104 104 104
**Efficiency @ 40/300C % 108.5 108.5 108.5 108.5
* At this resistance, the load will remain within the limits indicated on the data plate.
** European calculation methods are based on efficiency of 100% in units that do not
condense the flue gases, and of 110% in condensing units.
T
Ta ab bl le e 3 3 C Ca ap pa ac ci it ti ie es s & & W We ei ig gh ht ts s
Model EC16 EC23 EC31 EC38
Heating Water Capacity litres 1.5 1.8 2.1 2.4
Heating Water Coil Capacity (S models) Litres 1 1.3 1.5 10
Weight (empty) Kg 35 37 39 50
EC 16~38 Installation Manual page 11

T
Ta ab bl le e 4 4 H Ho ot t W Wa at te er r S Sp pe ec ci if fi ic ca at ti io on ns s
Model EC16 EC23 EC31 EC38
Maximum Rated Input kW 22.0 28.0 36.0 46.0
Modulating Output kW 2.9-22.0 3.4-28 4.8-36.0 6.4-46.0
Hot Water Flow rates at ∆τ 30K (S type) L/min 10.5 13.4 17.2 22
Maximum Tap Water Pressure bar 10 10 10 10
T
Ta ab bl le e 5 5 C Co on nn ne ec ct ti io on n V Va al lu ue es s
Min/Max Gas Pressure mbar 15/50 15/50 15/50 15/50
Minimum Input Rate Natural Gas m/h30.31 0.36 0.5 0.68
Maximum Input Rate Natural Gas m/h32.10 2.67 3.44 4.77
Electrical Supply VAC 230 230 230 230
Power Consumption Average W 60 60 60 60
Figure 1 Overall Dimensions mm. Figure 2 Bottom View Dimensions
mm.
Page 12 eco hometec (uk) ltd.

Figure 3 Top View Dimensions mm
11. Main Component
Specification
11.1 Head Height of the Central
Heating Circuit.
Figure 4 Pump Head Height
Volume of Water in Cu. Mts/ph. (m3/h.)
Grundfoss 240 Volt ~ 50Hz
Wattage 59 ~ 115 W
11.2 Air Fan Details.
Type. EBM GIG128~13~13
Figure 5 Air Fan Curve
11.3 Gas Control Valve.
Figure 6 Gas Valve
EC 16~38 Installation Manual page 13

12. Unpacking & Items Supplied
The following items are supplied with the
Boiler.
Installation manual (to be left with the
boiler).
Replacement fuses (located top left of
control panel).
Vent key.
Mounting bracket.
Outside air temperature sensor
13. Accessories
The following items are also available from
eco hometec at extra cost.
Colour coded 1/4 Turn Isolating Valves.
Stainless Steel Flexible Pipe Connections.
In line Filter/Strainers.
Condensate sump pump for below ground
installations. N.B. LPG installations must
not be installed below ground level.
eco hometec servicing software and RS
2323 interface cable for connection to a PC.
eco hometec RE2132 modulating room
sensor.
eco hometec EC30H Cable for connecting
three way diverter valve (external to boiler).
eco hometec cascade manager for
controlling multiple boiler installations
supplying heat to the same system. A
maximum of five boilers can be connected.
eco hometec PRO1 wall mounted pump
control box to control one or more pumps in
serial with the built in boiler pump.
eco hometec MR 03 mixing valve control
unit
For more details please contact the
eco hometec technical department.
eco hometec comprehensive range of PPS flue kits, fittings and accessories.
80/125 Concentric 500 mm Fanned Flue Kit
80/125 1000mm length PPS/White Galvanised Concentric Flue
80/125 500mm length PPS/White Galvanised Concentric Flue
80/125 PPS/White Galvanised 90 degree elbow
80/125 PPS/White Galvanised 45 degree elbow
80mm 1000mm PPS flue pipe
80mm PPS 45 degree PPS Elbow
80mm PPS 45 degree connector
80/125 Roof Terminal
Pitched roof tile flashing
Aluminium flat roof terminal/chimney top flashing
80mm Wall Fixing Clamp
125mm Wall Fixing Clamp
80mm PPS flexible flue liner (per metre)
80mm PPS flexible flue liner 360 degree spacers
80mm PPS flexible flue liner chimney terminal
80mm PPS flexible flue liner chimney terminal clamp
80mm PPS flexible flue liner boiler flue connector
Page 14 eco hometec (uk) ltd.

14. Operation
A key component of the boiler is the
ECONOX premixing, radiant, gas burner,
which is capable of producing a Variable
Controlled Output (20% to 100% ratio).
A unique feature of the ECONOX burner I
s its radiation cylinder, which has been
specially designed to suit the geometry of
the combustion chamber. It is composed of
a perforated sheet of stainless steel with a
metal fleece on its surface. On the surface
of this burner, accurate quantities of
premixed gas and air are burnt almost
without a visible flame
As a result of the extremely low combustion
temperatures produced during this process,
emissions of harmful atmospheric pollutants
are dramatically reduced, (NOx 20mg\kWh
CO 14mg\kWh).
14.1 Variable Controlled Output
The eco hometec on-board computerised
V.C.O. system with integral fault diagnostic
facility, ensures that optimum efficiency is
maintained when operating in both heating
and DHW modes.
According to the required flow temperature,
the premixing radiant burner modulates.
To save electricity, a 24-Volt, high efficiency
fan is used with a variable speed and power
capacity; if the heat demand decreases, the
fan will turn at a lower speed, which results
in a lower power consumption.
The fan is programmed to supply given
amounts of air for specific burner outputs.
This air pressure then controls the gas valve
which in turn, matches the gas pressure to
the required gas to air ratio (1:1).
The combustion gases are then passed
down through the SPIRANOX stainless
steel heat exchanger to atmosphere.
During their passage these hot gases are
used to preheat both the return water to the
boiler and the incoming combustion air, thus
ensuring that all of the available energy is
used as efficiently as possible.
14.2 Variable pump
A variable speed integral circulating pump is
supplied, which operates at different speeds
and results in a lower power consumption
(between 30 and 119 Watts).
This feature is to help maintain a
temperature difference of 20OC between the
flow and return temperatures on systems
using radiators.
14.3 Frost Protection
If the flow temperature falls below 80C, in
order to provide frost protection, the pump
will run even though there may be no
demand for heat. If the temperature
continues to fall, at 50C, the burner will also
ignite. At 100C the appliance will return to
standby mode.
14.4 Year Long Protection
During summer months, the pump and
mixer valve (if fitted) are exercised daily.
This prevents seizure of internal
components thus reducing maintenance
costs.
Remember when handing over the
appliance to advise the end user on the
precautions necessary to prevent frost
damage to the system during frosty
conditions. Stress the importance of leaving
the system turned on e.g continuous low
temperature setting in extremely cold
weather.
15. Siting the Appliance
In siting the boiler, the following
limitations MUST be observed
The boiler is not suitable for external use.
The position selected for installation MUST
allow adequate space for servicing in front
and below the boiler and for the circulation
of ventilation air around the boiler. Figure 8
shows the minimum clearances required for
safety and subsequent service. The position
must allow for the correct routing of a flue
system.
EC 16~38 Installation Manual page 15

The room must be dry and protected from
frost.
All eco hometec appliances are condensing
and pluming at the flue is a normal
occurrence. Flue terminal positions where
this, or the noise of flue gases discharging
from the flue could be a nuisance must be
avoided.
Normally no part of the appliance, other
than the water pipe-work (850C) and flue
pipe (750C), will exceed 650C. However, any
combustible material near to the boiler or its
flue system and water pipe-work must be
protected to ensure it does not exceed
650C.
In certain locations the flue outlet may
be susceptible to high winds or air
turbulence. Sudden gusts may create a
negative flue pressure. Flue terminal
outlets in such exposed conditions should
be avoided. When operating at low fan
speeds flame lift may occur. This can be
overcome by raising the minimum fan
speed.
It is advisable when installing
the boiler to use an eco hometec P.P.S.
plastic concentric flue system. This not only
ensures that there is sufficient combustion
air, but also reduces room ventilation
requirements thus increasing the number of
possible suitable locations.
The EC VCO MODELS may be installed on
the inner face of an external wall and some
internal walls providing they are flat, vertical,
of a non-combustible material and are
capable of supporting the weight of the
boiler and any other ancillary equipment.
Where installation will be in an unusual
location, special procedures may be
necessary. Detailed guidance on this
subject can be found in BS. 6798.
15.1 Timber Framed Dwellings
When installing the EC VCO
MODELS into a timber framed dwelling, it
must be fitted in accordance with the British
Gas publication ‘Guide for Gas Installations
in Timber Framed Housing’ ref. DM2.
For further advice contact the eco hometec
Technical Helpline.
16. Hydraulic Connections
16.1 First Fixing Pipe-work
All the pipe-work and wiring connections
enter at the bottom of the unit. To ensure a
tidy installation it is important to consider at
the first fixing stage the order you arrange
the pipe-work and if applicable any cable
trunking. Figure 7 shows the order in which
to fix the pipe-work.
Figure 7 Pipe-work Layouts
16.2 Type ‘H’ Connections
1) Cable Gland
2) Syphon Flush (No permanent
connection required)
3) Heating Flow ~ 22mm
4) Additional Cable Entry Point
5) Not applicable to H model
6) Gas Inlet ~ 15mm.
7) Not applicable to H model
8) Heating Return ~ 22mm.
9) Condensate Discharge ~ ¾ M.I.
16.3 Type ’HS’ Connections.
1) Cable Gland
2) Syphon Flush (No permanent
connection required)
3) Heating Flow ~ 22mm
4) Additional Cable Entry Point
5) Flow Domestic Hot Water 22mm
6) Gas Inlet ~ 15mm
7) Return Domestic Hot Water 22mm
8) Heating Return ~ 22mm
9) Condensate Discharge ~ ¾ M.I.
Page 16 eco hometec (uk) ltd.

16.4 ‘S’ Connections.
1) Cable Gland
2) Syphon Flush (No permanent
connection required)
16.7 Fixing the boiler.
3) Heating Flow ~ 22mm.
4) Additional Cable Entry Point
5) Flow Domestic Hot Water 22mm
6) Gas Inlet ~ 15mm
7) Cold Mains Water ~ 22mm
8) Heating Return ~ 22mm
9) Condensate Discharge ~ ¾ M.I.
16.5 Clearances
For ease of installation, necessary
inspection and commissioning, the following
clearances are recommended.
T
Ta ab bl le e 6 6 M Mi in ni im mu um m C Cl le ea ar ra an nc ce es s
Sides 50mm
Above 250mm
Below 150mm
Front 455mm
Figure 8 Minimum Clearances
16.6 Checks Before Siting
Before commencing to install this appliance
ensure the design specification complies
with all of the requirements contained in
these installation and servicing instructions
and any statutory documents which may
apply.

The manufacturers instructions must
not be allowed to override statutory
requirements. More than one person may
be required to install the appliance.
When unpacking the unit for the first time,
take adequate precautions to protect the
surrounding floor coverings. The boilers
are factory tested and contain residues of
water that could cause dampness and
possible staining if contact with carpets and
floor coverings is not prevented.
Unpack the appliance and ensure that the
items listed on page 14 have been supplied.
16.8 Removing The Casing
To remove the casing lay the unit down on
the floor with the casing facing upper most.
Loosen the centre screw and undo the two
toggle casing clips located on the bottom of
the unit. Pull the casing upwards, lifting up
and off the internal locating lugs. Place the
casing to one side taking care not to scratch
the casing or control panel cover. (see
figure 9.)
Figure 9 Removing the Casing
Take any necessary precautions to protect
the surrounding working area and
decorations from dust and damage.
Make one final check on the location pay
particular attention to the flue outlet
(consider pluming) and the condensate
discharge pipe route.
EC 16~38 Installation Manual page 17

 Install the combi model as close
as possible to the hot water taps to avoid
the hot water pipes from becoming too long.
This prevents long delays and unnecessary
waste of water.
When you are satisfied the location meets
all the required criteria mark out the wall for
required fixing points. Use the fixing
bracket as a template.
Figure 10 Fixing Dimensions
Check for horizontal and vertical alignment
and drill 4 holes as marked using a No.14
masonry drill.
Clear the surrounding area of any dust and
debris and secure the mounting frame to the
wall using suitable screws and plugs.
Locate the boiler on the mounting frame.
 The appliance should be 10mm
off the wall measured at the base of the
panel. Failure to observe this will result in
condensate becoming trapped inside the
heat exchanger. Component failures as a
result of incorrect installation will not be
covered by the boilers normal warranty.
Please remember when using power tools
to take all necessary safety precautions and
always wear safety goggles.
17. Flues and Ventilation
The internal boiler flue system is
manufactured in P.P.S plastic and the flue
outlet may be connected to an external
P.P.S plastic or stainless steel flue system.
17.1 Maximum Flue Lengths
The flue materials, flue insulation, the
amount of vertical and horizontal pipe and
the amount of bends incorporated
determine the maximum permissible flue
length. The excess fan pressure available
for overcoming the frictional resistance of
the flue system is 100 p.a.
Page 18 eco hometec (uk) ltd.

Figure 11 Flue Design
Boiler output in relation to available flue Pa
lower outputs = more Pa and longer flue lengths
0
50
100
150
200
250
300
350
400
450
500
25 26 27 28 29 30 31 32 33
Boiler output ~kW
Available flue ~ Pa
For the purposes of flue design when using the eco hometec PPS 125mm/80mm concentric flue
system then refer to the table below for component resistances.
T
Ta ab bl le e 7 7 F Fl lu ue e R Re es si is st ta an nc ce e
COMPONENT RESISTANCE
80/125 Concentric 500 mm Fanned Flue Kit
80/125 1000mm length PPS/White Galvanised Concentric Flue
80/125 500mm length PPS/White Galvanised Concentric Flue
80/125 PPS/White Galvanised 900elbow
80/125 PPS/White Galvanised 450elbow
80mm 1000mm PPS flue pipe
80mm PPS 900elbow
80mm PPS 450elbow
80/125 Roof Terminal
Open terminal with stainless steel mesh
P.a
5.0
4.5
2.25
4.0
2.0
2.5
1.0
.5
7.5
2.5
For vertical external and internal flues there is a further gain from thermal lift.
This can be calculated from the graph below.
EC 16~38 Installation Manual page 19

Figure 12 Thermal Lift
Thermal lift when
flue gas temp 80C and outside temp 10C
0
20
40
60
80
100
120
140
160
180
02468101214161820222426283032343638404244464850
Flue lengths ~ metres
Draught ~ Pa
Uninsulated Flue
Insulated Flue
Thermal lift is generated naturally in the vertical part of a flue system, reducing the overall
resistance of the system.
The available lift may be calculated from the Thermal lift graph and deducted from the total
calculated flue resistance.
17.2 Available Flue Components
80/125 Concentric 500 mm Fanned Flue Kit
80/125 1000mm length PPS/White Galvanised Concentric Flue
80/125 500mm length PPS/White Galvanised Concentric Flue
80/125 PPS/White Galvanised 90 degree elbow
80/125 PPS/White Galvanised 45 degree elbow
80mm 1000mm PPS flue pipe
80mm PPS 45 degree PPS Elbow
80mm PPS 45 degree connector
80/125 Roof Terminal
Pitched roof tile flashing
Aluminium flat roof terminal/chimney top flashing
80mm Wall Fixing Clamp
125mm Wall Fixing Clamp
80mm PPS flexible flue liner (per metre)
80mm PPS flexible flue liner 360-degree spacers
80mm PPS flexible flue liner chimney terminal
80mm PPS flexible flue liner chimney terminal clamp
80mm PPS flexible flue liner boiler flue connector
Page 20 eco hometec (uk) ltd.