EHC ECOSAVE 21K User manual

GAS FIRED WALL MOUNTED CONDENSING
COMBINATION BOILER
FOR SEALED CENTRAL HEATING SYSTEMS AND MAINS FED DOMESTIC HOTWATER
THE APPLIANCE IS FOR USE
WITH NATURAL GAS OR L.P.G
EHC ECOSAVE 21K
EHC ECOSAVE 25K
EHC ECOSAVE 32K
EHC ECOSAVE 37K
INSTRUCTION MANUAL
INSTALLATION, COMMISSIONING
& SERVICING

EHC
Preface
2
Preface
About the instructions
The instructions contain important information for the safe,
professional installation and start-up of the EHC Ecosave gas-
Readers of the instructions need to be professional installers,
who have been trained and have experience for working on
heating and gas systems.
Subject to technical changes
The contents of the instructions are subject to changes due to
our policy of continuous improvement.
Choose
Building
Regulations
Route
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
LABC will record the data
of compliance
Gas Safe will record the data
of compliance to the
property
You must ensure that the
by Gas Safe is written onto
the Benchmark Checklist
Scheme Members only
Contact Gas Safe or visit
www.gassaferegister.co.uk
If you notify via Gas
Scheme, Gas Safe will then
notify the relevant Local
Authority Building Control
Scheme on member's
behalf
Complete the Benchmark
Checklist
Install and Commission
this appliance to
manufacturer's instructions
Complete the Benchmark
Checklist
Install and Commission this
appliance to manufacturer's
instructions
Building Control
Competent Person's

3Contents
EHC
1. Safety Considerations 4
1.1 Safety Denitions
1.2 Symbols Used in the Instructions
1.3 Important Safety Precautions
1.4 Legislation
1.5 CE Marking Information
2. Product Description 6
2.1 Description
2.2 Layout and Key Components
2.3 Control Panel
3. Technical Data 8
3.1 General Specications
3.2 Hydraulic Data
4. Dimensions 10
5. System Details 11
5.1 Operation Modes
5.2 Safety Functions
6. Installation Requirements 13
6.1 Location
6.2 Required Minimum Clearances
6.3 Ventilation
6.4 Gas Supply
6.5 Electrical Supply
6.6 Water Supply
6.7 Condensate Drain
6.8 Flue
7. Flue Options 18
7.1 Calculating the Overall Length of the Flue System
7.2 Fitting the Concentric Flue System
7.3 Fitting the Separate Flue System
8. Installation Procedure 21
9. Transporting and Unpacking 22
9.1 Transporting the Appliance
9.2 Unpacking and Checking the Accessories
10. Mounting the Appliance on the Wall 23
11. Making the Gas Connection 24
11.1 Gas Piping Materials
11.2 When using LPG
11.3 Gas Supply Pipe Installation Procedures
12. Fitting the Water Pipes and Condensate Pipe 26
12.1 Water Pipes and Condensate Pipe Connection Procedures
12.2 General Pipework Connections
12.3 Water Pipe Size and Water Pressure
12.4 Pressure Relief Valve
12.5 Frost Protection
Contents
13. Connecting the Flue 28
13.1 For a concentric ue system
13.2 For a separate ue system
14. Electrical Connections and Settings 29
14.1 Accessing the Controller Assembly
14.2 Accessing All the Electrical Connections
14.3 Connecting to Mains Power 230V
14.4 Connecting the Controller, Accessories and External Controls
14.5 Ensuring the DIP Switch Settings
15. Final Check and Commissioning 33
15.1 Connecting the Power Cable and Turning the Power ON/OFF
15.2 Checking the Gas Settings
15.3 Checking the Gas Equipment for Soundness
15.4 Checking and Adjusting the CO2 Value
15.5 Installing the Front Cover
15.6 System Filling and Pressurising
15.7 Operational Checks
15.8 Final Commissioning Check
16. Instructing the End User 41
16.1 Handing over the Instructions
16.2 Showing How to Operate
17. Error Code List 41
18. Electrical 42
Appendix 'C' Commissioning Check List
Appendix 'B' Warranty Conditions
Appendix 'A' Gas Conversion
20. Appendix 47
18.1 Wiring diagram
19. Parts List 43
19.1 Base Parts
19.2 Burner Parts
19.3 Water Way Parts

Safety Considerations
4EHC
Safety Considerations1.
Important Safety Precautions1.3
DANGER
If you smell gas
Gas Leaks can cause explosions, which may
lead to serious injury..
Do not smoke. Prevent open ames and sparks.
Do not operate light switches or electrical equipment
switches.
Open the windows and doors.
Close the gas shuto valve.
Shut down the heating system.
Keep people away from the danger zone.
Observe the safety regulations of your local gas supplier,
found on the gas meter.
Notify your heating contractor from the outside of the
building.
Flue gas may lead to life-threatening poisoning.
Shut down the heating system.
Ventilate the location.
Close all doors leading to living spaces.
Do not operate electrical switches.
CAUTION
Working on the heating system
Isolate the system from the main electrical power supply, e.g.
by removing a separate fuse or by means of a main electrical
isolator, and check that it is no longer “live”.
Isolate the gas supply and safeguard it from unauthorized
reopening.
For propane appliances
Purging the liquid gas tank when installing the system:
Before installing the appliance make sure that the gas tank
has been purged. The liquid gas supplier is responsible for
properly purging the tank. Ignition ploblems may occur
if the tank is not bled properly. In such cases, frst contact the
person responsible for filling the tank.
Safety Definitions1.1
All safety messages will refer to potential hazards. Precisely
follow the instructions to avoid the risk of injury.
This is the safety alert symbol. It is used to alert
you of potential personal injury hazards.
Adhere to all safety messages that follow this
Symbol to avoid possible injury or death.
List of safety symbols in the instructions
DANGER 
Indicates an imminently hazardous situation which, if not
avoided, could result in severe injury or death.
WARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in severe injury or death.
CAUTION
Indicates an imminently hazardous situation which, if not
avoided, could result in minor or moderate injury.
CAUTION
Used without the safety alert symbol indicates a potential
hazardous situation which, if not avoided, could result in
property damage.
Symbols Used in the Instructions1.2
The following symbols are used throughout the instructions to
bring attention to the important information concerning the
appliance.
Important Warns of a risk of material loss and
environmental pollution.
Note
Indicates additional information that is
important but not related to personal injury
or property damage.

5Safety Considerations
EHC
Legislation1.4
EHC Declares that this appliance is free of any harmful
substances, and no harmful substances are used during
appliance manufacturing.
The appliance is suitable only for installation in GB and should
be installed in accordance with the rules in force, and only used
in a suitably ventilated location.
GAS SAFE Registered Installer.
The appliance must be installed also in accordance with the
relevant requirements of the:
Gas Safety (Installation & Use) Regulations.
The appropriate Building Regulations : either one of The
Building Regulations, The Building Regulations (Scotland) , or
The Building Regulations (Northern Ireland).
The Water Fittings Regulations or Water Byelaws in Scotland.
The Current I.E.E. Wiring Regulations.
For detailed information on the installation of condensing
boilers, reference should be made to the ODPM Guide to the
Condensing Boiler Assessment Procedure for Dwellings.
C.O.S.H.H.
Materials used in the manufacture of this appliance are
Non hazardous and no special precautions are required when
servicing.
Codes of Practice - refer to the most
recent version
Installation should also comply with the following British
Standards Codes of Practice:
Standard Scope
BS 1212-1:1990 Float operated valves
BS 4814:1990 Specication for expansion vessels using
an internal diaphragm
BS 5440 Part 1 Flues
BS 5440 Part 2 Ventilation
BS 5546 Installation of hot water supplies for
domestic purposes
BS 5449 Forced circulation hot water systems
BS 5482-2:1977 Domestic butane- and propane-gas-
burning installations
BS 6281-1:1992 Devices without moving parts for the
prevention of contamination of water
BS 6282-2:1992 Devices with moving parts for the
prevention of contamination of water
BS 6283-4:1991 Safety and control devices for use in hot
water systems
BS 6798 Installation of gas red hot water boilers
BS 6880-1:1988 Title code of practice for low
temperature hot water heating systems
BS 6891:2005 Gas Installation
Standard Scope
BS 7074 Expansion vessels and ancillary
equipment for sealed water systems
BS 7593 Treatment of water in domestic hot
water central heating systems
BS 7671:2008 Requirements for electrical installations
BS EN 303-7:2006 Heating boilers
BS EN 483 Type C Boiler of nominal heat input not
exceeding 70 kW
CE Marking Information1.5
0051
The appliance complies with the basic requirements of the
relevant European directives.
Gas appliances directive (90/396/EEC)
Electromagnetic compatibility directive with threshold class B
(89/336/EEC)
Low voltage directive (73/23/EEC)
directive (92/42/EEC) as condensing boilers.
The Gas Appliance (Safety) Regulations 1992
As a result of our policy of constant development, there may
be small diferences between illustrations, functional steps and
technical data.
In GB, the appliance must be installed and commisioned by a

Product Description
6EHC
Product Description2.
Description2.1
EHC Ecosave condensing gas boiler is a fully automatic, wall
hung, fan assisted balanced ue condensing boiler for use with
Natural Gas and Propane Gas. For gas type conversions see the
Appendix on Page 39.
This appliance is fully modulating and provides central heating
and domestic hot water. The following four models are available
according to their maximum outputs.
Model Maximum
Heating Output
Maximum
DHW Output
EHC Ecosave-21K(A) 19.3 kW 23.1 kW
EHC Ecosave-25K(A) 23.1 kW 23.1 kW
EHC Ecosave-32K(A) 29.5 kW 34.2 kW
EHC Ecosave-37K(A) 34.2 kW 34.2 kW
The appliance always gives priority to DHW supply.
The appliance is designed to be used with a circulation pump,
a divert valve assembly, a ow sensor, a DHW plate heat
exchanger, a safety valve, and a CH expansion vessel. A separate
DHW expansion vessel is not required.
Internal frost protection and an electronic control unit are
incorporated within the boiler. Any volt free room thermostat
can be used with the boiler.
Cold water
Central
Heating
(CH)
Domestic
Hot Water
(DHW)
Domestic
hot water
Hot water tap
CH
ow
Floor Heating Circuit or
Heating Circuit (Radiator)
CH
return

29
21
7Product Description
EHC
Layout and Key Components2.2
1 Expansion vessel
1
2
3
4
5
6
7
11 15
14
13 17
16 18
30
26
12
28
27
25
24
23
22
20
19
8
9
10
2 Heat exchanger & latent heat exchanger pipe
3 Heat exchanger outlet
4 Water pressure sensor
5 Air inlet
6 DHW
7 Gas control valve
8 Heat exchanger inlet
9 Magnetic Filter
10 Circulation pump
11 Flow
12 burner
13 Return
14 Pressure Relief
15 Gas Inlet
16 DHW outlet
17 Mains Water In
18 Cable Entry
19 DHW Flow
20 Condensate Syphon
21 Air Pressure Sensor
22 Gas
23 Gas/Air Mix
24 Latent Heat
25 Primary Heat
26 Mixing Flow
27 Exhaust
28 Electronic Ignition
29 Burner Mixing
30 Ignition
Control Panel2.3
ow
temperature, the pressure in the heating
system, the operating mode and additional
functions.
3 654
12
2 CH temperature control knob
3 DHW temperature control knob
4 [MODE] button
5 [main ON/OFF] button
6 [RESET] button

Technical Data
8EHC
l/min 7.8 11.7
Electrical Supply V/Hz 230 / 50
Nominal Absorption A 0.6 0.62
Power Consumption W 130
Electrical Protection IPX5D
Installation Type Wall Mounting Type
Intake/Exhaust Flue System Type B23-B33-B53-C13-C33-C43-C53-C63-C83
Intake/Exhaust Flue Diameter mm Concentric 60/100 – Separate 80/80
Max. Flue System Resistance Pa 167 294
Max. Horizontal Coaxial Ø60/100 Flue length (EHC System) m 20
Max. Vertical Coaxial Ø60/100 Flue length (EHC System) m 21
Equivalent Length of Ø60/100 Bend 90° m 1.3
Equivalent Length of Ø60/100 Bend 45° m 1
Max. Horizontal Coaxial Ø80/125 Flue length (EHC System) m 68
Max. Vertical Coaxial Ø80/125 Flue length (EHC System) m 70
Equivalent Length of Ø80/125 Bend 90° m 2.2
Equivalent Length of Ø80/125 Bend 45° m 1
Equivalent Length of Ø60/100 => Ø80/125 Adapter m 0.5
Max. Horizontal Separate Ø80-Ø80 Flue length (EHC System) m 110
Equivalent Length of Ø80 Bend 90° m 2.2
Equivalent Length of Ø80 Bend 45° m 1.4
Gas Inlet Connection mm 22
Physical dimensions (Width × Depth × Height) mm 440 × 370 × 695
gkWeight 35 38
0.5
Heating Water Connection mm 22
Connecting Diameter Domestic Hot and cold Water Connection mm 15
Technical Data3.
Unit Ecosave
21K(A)
Ecosave
25K(A)
Ecosave
32K(A)
Ecosave
37K(A)
Heat Input (Max/Min) kW 19.6/4.9 23.5/4.9 30.0/7.0 34.9/7.0
Domestic Hot Water Input (Max/Min) kW 23.5/4.9 34.9/7.0
Heating Output (Max/Min) - Flow/Return (50/30°C) kW 19.3/4.8 23.1/4.8 29.5/6.8 34.2/6.8
Domestic Hot Water Output (Max/Min) kW 23.1/4.8 34.2/6.8
Condensing Heating Output (Max/Min) - Flow/Return (50/30°C) kW 21.1/5.2 25.2/5.2 32.6/7.5 37.6/7.5
% 100.7 101.6 101.8 101.9
% 109.6 108.4 108.4 108.3
Heat Loss through the Case with Burner On % 0.1 0.1 0.1 0.1
Heat Loss through the Chimney with Burner On % 1.6 1.8 1.5 1.9
A
NOx Class 5
Category II2H3P
Purpose Heating and Domestic Hot Water Production
Heating Adjustability Range Rated
Heating Water Circulation Method Air Close Type
Max Heating Water Pressure bar 3
Max Heating Temperature °C 85
Adjustable Temperature Heating Setting °C 30 - 85
Total Volume Expansion Vessel L 6.5
Expansion Vessel Pre-charge bar 1
DHW Output kW 23.1 - 4.8 34.2 - 6.8
Min. Dynamic DHW Pressure bar 0.3
Min. DHW Flow Rate l/min 2.5
Max. DHW Pressure bar 10
Adjustable DHW Temperature °C 30 - 65
l/min 11.7 17.6
l/min 10.0 15.1

9Technical Data
EHC
Hydraulic Data3.2
The following graph shows the development of the Available Head Pump to the System
0
100
200
300
400
500
600
0 200 400 600 800 1000 1200 1400 1600 1800
Heating Flow Rate(l/h)
Head (mbar)

D
Dimensions
10 EHC
Dimensions4.
698.8
745.7
Front view
110.4 10
376.3
37 366
255
Overhead view
55
49.2
39.1
122.5 75
60
60.4
25.5
6.1
366.3
440
67.5
Bottom view
All dimensions in mm
A: Heating outlet 22mm
ABC E
B: Heating inlet 22mm
C: Gas inlet 22mm
D: DHW outlet 15mm
E: Main water inlet 15mm

11System Details
EHC
System Details5.
Operation Modes5.1
Circuit for CH (central heating) mode
When central heating is in demand, the three-way valve1.
is set to CH mode position.
When the burner has ignited and the flame is detected,2.
the control starts heating up the CH water to the set
temperature. This control regulates the gas input rate by
changing the fan speed.
The pump runs from 0 to 600 seconds depending on the
set temperature.
Blow Fan
Circulation
Pump
Gas Valve
Ignition
Electrode
Flame Sensing
Electrode Metal Fibre
Burner
Expansion
Vessel
Three-way
Valve
Heat
Exchanger
Gas
Inlet
Mixing Flow
Guide
CH
Flow
CH
Return
Note Low water pressure error
cancelling function
If the water pressure falls below 0.4 bar, the low
water pressure error occurs on the control panel.
Note Weather Compensation
If an outdoor temperature probe is connected,
the weather compensation function can be used.
With this function, the target primary temperature
is automatically set according to the outdoor
temperature (K-factor).
Note - The control panel enables you to adjust
the parameters by resetting the K-factor.
K=0.5
K=1
K=1.5K=6 K=4 K=3 K=2
20
20.0
30.0
40.0
50.0
60.0
70.0
80.0
15 10 5 0 -5 -10 -15 -20 -25
Outdoor Temperature (°C)
Target primary temperature
3.
Relationship between primary and outdoor temperature: K-factor
In this event re-pressurise the boiler to 1.5 bar
Note The minimum operating
pressure can be adjusted in the
service menu.

System Details
12 EHC
Circuit for DHW (Domestic Hot Water) mode
1.
in demand by a tap or shower, the three-way valve
is set to DHW mode position as priority is given to the
DHW mode.
The primary water circulates through the DHW Heat2.
Exchanger, and the water coming from the inlet is
heated.
The heating control function controls the burner until the3.
DHW reaches the set temperature.
After DHW is used, the burner is extinguished and the4.
three-way valve remains in the DHW mode position. The
mode.
When CH is demanded, the position of the three-way5.
valve is changed to the CH mode position, and the system
returns to the CH mode.
Blow Fan
Circulation
Pump
Gas Valve
Heat
Exchanger
outlet Inlet
DHW Water
Inlet
Gas
Water
Sensor
Flow
DHW Heat
Exchanger
Ignition
Electrode
Flame Sensing
Electrode Metal Fibre
Burner
Expansion
Vessel
Three-way
Valve
Mixing Flow
Guide
DHW Pre-heating mode
If the CH mode is not used and the service setting for the DHW
pre-heating mode is set to ON, the DHW pre-heating mode
can be used.
The primary water circulates through the DHW Heat1.
Exchanger. This pre-heats the unit in preparation for
DHW demand.
The burner is ON or OFF depending on the return2.
temperature so that the set temperature is maintained.
Return Temp (°C)
on
T-
off
Burner operation
DHW
pre-heating
mode
MIN
MAX
Time
ONOFF
Blow Fan
Circulation
Pump
Heat
Exchanger
Inlet
Gas
DHW Heat
Exchanger
Gas Valve
Ignition
Electrode
Flame Sensing
Electrode Metal Fibre
Burner
Expansion
Vessel
Three-way
Valve
Mixing Flow
Guide
T-

13Installation Requirements
EHC
Safety Functions5.2
Frost Protection
In CH, DHW, and Weather Compensation modes, frost protection
is an integral function for protecting the appliance. This function
is the highest priority among the operation modes and this
There are two kinds of processes depending on the primary
water temperature.
6 -10°C
If the primary water temperature falls below 10°C, the control
system runs the pump for 10 minutes and stops the pump for
1 minute. This process is continued while the primary water
temperature is in the above mentioned range.
Below 6°C
The appliance ignites the burner in the CH mode until the
primary water temperature reaches 21°C.
High Temperature Protection (HTP)
In stand-by and while the burner is operating, if the High
pump and the fan start in order to reduce the temperature of
the appliance. The pump and the fan continue to run in the CH
mode until the primary water temperature falls below 80°C.
While the burner is operating, the safety shut-down process
takes place. At this point the pump and the fan re-start.
Actuator Protection
If the appliance is not operated for 24 hours, the fan and pump
automatically operate for 30 seconds to prevent seizing.
Air Flow Checking
During the start-up sequence, the “no air check” function
supply.
Installation Requirements6.
Location6.1
DANGER
The appliance must be tted to a suitable wall to prevent re
and explosion. At the installation site, the ue that passes
through the outside wall or roof must be routed properly
in order to satisfactorily remove flue products. Also, an
adequate air supply must be provided, and combustible
products need to be removed.
Do not t the appliance near paper, newspapers, magazines,
or any other combustible objects.
Do not t the appliance where rubbish is located.
WARNING
If the appliance is tted in a room with high humidity (e.g.
a room containing a bath or a shower), the appliance and
any electrical switch or appliance controller, etc. should
be situated specically in accordance with the current IEE
Wiring Regulations and Building Regulations.
If the appliance is tted into a building made of timber
frames, refer to the latest edition of the Institute of Gas
Engineers Publication IGE/UP/7 (Gas Installations in Timber
Framed Housing) or British Gas Document DM2 and DM3.
The appliance should not be ftted in the building unless it is
protected by an appropriate enclosure, such as a garage or
outbuilding. (The appliance may be tted inside a cupboard).
For other unusual locations, refer to BS 6798:2000 for
detailed guidance.
Note Fit the appliance at an appropriate height.

around local obstructions.
Installation Requirements
14 EHC
Required Minimum Clearances6.2
appliance. The following minimum clearances (mm) must be
maintained for installing and servicing.
440 mm
5 mm
200 mm
698.8 mm
5 mm
600 mm min
These dimensions include the necessary clearances around the
appliance for case removal, spanner access and air movement.
Additional clearances may be required for the passage of pipes
Ventilation6.3
the appliance is installed. If it is installed in a cupboard or
compartment, permanent ventilation for cooling purposes is
not required. Detailed recommendations are given in BS 5440
Part 2.
Gas Supply6.4
Gas installation must comply with the requirements in BS
6891.
Check for leaks at every joint as described in BS 6891 to
check the soundness.
Ensure that the pipe sizes, including the ones for other gas
appliances on the same supply, are adequate for demand.
Electrical Supply6.5
Main supply : 230 V~/50 Hz with 3 Amp fuse certied BSI or
VDE.
Cable : PVC insulated 0.75 mm2(24 × 0.2 mm) temperature
rated to 90°C.
The appliance must be earthed.
All pipes to the appliance must be cross-bonded.
Wiring must comply with IEE Wiring Regulations and any
local regulations which may apply to a xed wired
stationary appliance.
External wiring must be correctly earthed, polarized and
must comply with related regulations/rules.
Note The way the electricity supply is connected must
facilitate the complete electrical isolation of the
appliance. It may be connected via a fused double-
pole isolator with a contact separation of at least
3 mm for all the poles for servicing the appliance
and system controls only.
Water Supply6.6
CAUTION
(ensure the appliance is not connected) to remove any sediment
and prevent the heat exchanger from being damaged by
build-up or corrosion due to any sediment.
Do not use petroleum-based cleaning and seals because
the system may be damaged and may result in substantial
property loss.
Immediately repair leaks in the appliance or piping in order
to prevent the build-up of mineral and corrosion in system
components due to the continuous water make up.
The build-up of minerals and corrosion will reduce the life
of the appliance.
Case
Removal
Purposes
250 mm

15Installation Requirements
EHC
Condensate Drain6.7
General instructions
Important The condensate must be drained from the
appliance in accordance with applicable
rules and regulations.
Note Reliable operation of the appliance will
be afected by an improperly connected
condensate piping.
The condensate pipe must retain a
downward slope of at least 2.5 degrees
throughout.
This appliance is a high eciency gas appliance that
creates condensate when operating. The condensate must
be discharged in accordance with any national or local
regulations in force since the condensate has an acidity (pH)
of approximately 3 - 4 (BS 6798:2000 & Part H1 of the Building
Regulations give further guidance).
A condensate trap is built into the appliance as standard.
Options for the condensate drain (see the gures on the
next page).
From the appliance to the drain/gully via a sink waste1.
(the bottom of the appliance must be above the top of the
sink and must be downward-sloping to properly discharge
condensate)
From the appliance to the internal soil and vent stack2.
From the appliance to a soakaway hole surrounded by3.
limestone chipping
From the a4. ppliance to the drain/gully
Of the above options, EHC recommends option 1 as the soap
from the sink neutralizes the acidic condensate.
If a sink waste is not abilable, EHC recommends options 2, 3, or
4. If permitted by local regulations, the condensate may
be drained directly into the drain/gully.
Note If a soakaway hole is installed, periodical
replacement of the limestone chipping (or
neutralizing agent) is required. The rate of depletion
of the limestone varies depending on the usage
of the appliance. Occasionally check the depletion
of the neutralizer, and replace the limestone if any
depletion is observed.
CAUTION
Requirements for the condensate piping are as follows.
So that condensate can be properly drained thet
diameter of the plastic piping should be a minimum of
22 mm.
The condensate pipe should be made of a non-corrosivet
material, such as PVC, PVC-U, ABS, PVC-C or PP. Metal
materials are NOT suitable.
For safety reasons the ends of the pipes should extendt
as close as possible to the ground or drain/gully.
To reduced the risk of the condensate becoming trapped
as few elbows and fttings as possible should be used.
When draining the condensate into an internal soil andt
vent stack, the plumbing eect must be considered.
If the pipes are easily aected by internal pressure
uctuations, when WC's are ushed or sinks are emptied,
back-pressure may force water out of the appliance trap
and a lockout may occur.
The length of the external pipework should be kept tot
a minimum and routed as vertically as possible. Where
the pipework is subjected to extreme cold or windchill,
weatherproof insulation should be used. If insulation is
not used then the condensate pipework should have a
minimum diameter of 32 mm.
For 22 mm diameter condensate drainage pipe, thet
maximum length is 3 metres.
If the appliance is tted in an unheated location, thet
entire pipe system should be treated as an external run.
In order to prevent sagging, any external runs need tot
be propped up with supporting clips.

Installation Requirements
16 EHC
Examples of available options for
condensate drain
1. From the appliance to the drain/gully via a sink
2.5º minimum drop
22 mm plastic
condensate
pipe
Frost proof insulation
(if necessary)
The end of the pipe must be above water level
but below the surrounding surface.
*
2. From the appliance to the external rain water pipe into
foul water
43 mm 90°
M &F bend
Internal soil
and vent stack
22 mm plastic
condensate pipe
running through
the external wall
External rain water
pipe into foul water
68 mmΦ PVC-u
strap on fitting
Extarnal air break
Air gap
3. From the appliance to a soakaway hole surrounded by
limestone chipping
2.5º minimum drop
100 mm Φmin.
sealed plastic tube
Limestone
chippings
500 mm min.
Ground
level
Drainage
holes
22 mm plastic condensate
drainage pipe, max extarnal
length 3 metres
Holes in the soakaway must face away from the
building.
*
Hole depth
400 mm min.
(by 300 mmΦ)
25 mm
4. From the appliance to the gully
22 mm plastic
condensate pipe
The end of the pipe must be above water level
but below the surrounding surface.
*
75 mm
min.
100mm
Visible air break
at pulg hole
Sink with
integral
overow
75 mm sink
waste trap
Frost proof
insulation
(if necessary)
Condensate drain termination
Outside wall
Condensate
pipe
External
drain
Drain/Gully
sink
Drain/Gully
PRV

Standard conditions are experimental values for the
17Installation Requirements
EHC
8.6eulF
The minimum distances between the terminals and elements of
the building are as per the following.
A
G
J
F
H, I
A
A
A
E
BCD
FF
F
B
GM
G
Use of terminal guards needs to be considered.
KL
L
KN
Description
Minimum
Distance
(cm)
A From openings (e.g. doors, windows, ventilation tiles)
30(*1)
B Below gullies, down-pipes, or drain pipes
7.5
C Below gutters
20
D Below balconies
20
E From down pipes
2.5
F From external and internal corners
30
G Above the ground, a roof or balconies
30
H
From the opposite wall of a carport (when another
ue is not installed)
60
I
From a terminal, that is facing the terminal, on the
opposite wall of a carport
120
J
Next to openings (e.g. doors, windows) within a
carport
120
K Vertically away from a terminal on the same wall
150
L Horizontally away from a terminal on the same wall
30
M From an adjacent vertical ue pipe
50
N From openings in a directly opposing building
200(*2)
*1 The terminal should not be located within 15 cm from openings
in the building material made for a built-in object (e.g. window
frame)
*2 This length is according to BS 5440-1.
CAUTION
Terminal guards must be provided for any terminals which are
located less than 2 metres above a balcony, above a at roof, or
above ground which people can access.
Note For vertical ue pipes, the terminal must not bet
within 60 cm of any openings
Formula of Length Equivalency
This is the formula for sizing the pipes for the intake of the
combustible air and the discharge of the combustion products.
The Length equivalency (L eq) in these instructions are for the
lengths of the pipes which share the same cross-sectional
dimensions.
Resistance of the component
under standard condition
Resistance of a 1-metre-long pipe
(with pre-established diameter)
under standard condition
capacities, fume temperature and air temperature for various
thermal power values. They represent dierent operating
conditions.
Example of coaxial system calculations
Planning the system run.1.
Measuring the length of the system run.2.
Determining the values of the length equivalency for all3.
components.
Calculating the value of the total length.4.
Comparing the values with the maximum permissible5.
length.
CAUTION
The wall on which the intake/exhaust ue is set must be
made of incombustible interior materials and must connect
to the outside. Dangerous materials or obstructions must
not be near the intake/exhaust ue.
The exhaust ue should be covered with over 20 mm of
incombustible material when it passes through a wall made
of combustible material and must be kept at least 50 mm
away from any combustible materials.
Connection parts of the exhaust ue must be properly
connected by proper sealing gasket. Check for any exhaust
gas leaks.
Before cleaning the intake/exhaust ue, turn o the
appliance and wait until the pipes have cooled down.
Safeguard the ue terminals from snow buildup.

Flue Options
18 EHC
Flue Options7.
Fitting the Concentric Flue System7.2
Concentric Horizontal Flue
a) Standard ue system (Φ60/100 mm)
A
B 500 or 1,000
851 140 min
Wall
Standard ue system: A = 20 m
“B” is the ue outlet/ventilation pipe
(can be shortened as necessary).
”A” is the combined length of the ue outlet/
ventilation pipe maximum 20 m.
b) Extended ue system (Φ60/100 mm)
B
A
Total ue length: A + B – (1 x 90° elbow)
= 20 – 1.3 =18.7 m
Calculating the Overall Length of the7.1
Flue System
These ue systems may be oriented in all the various directions
of the compass, north, south, west and east. Some special
components such as concentric bends are used so that
certain positions can be reached. Each concentric ue system
kit includes an adapter, which allows the appliance to be
connected to the ue system.
However, the total ue length cannot exceed the prescribed
maximum ue length. If concentric bends are required, please
bear in mind that each of them has resistance that corresponds
to its specic linear length.
There are 2 separate connections (horizontal and vertical) for
the concentric ue system and separate ue system.
Study the following connection depictions to determine which
ue system is the most suitable.
Maximum Flue Length
Diameter of
Pipe [mm] Orientation Maximum Flue Length [m]
Concentric
Flue
System
Φ 60/100
Horizontal 20
Vertical 21
Φ 80/125
Horizontal 68
Vertical 70
Separate
Flue
System
Φ 80/80
Horizontal
110
Vertical
Reduced Flue Length
Diameter of
Pipe [mm] Angle Reduced Flue Length [m]
Concentric
Flue
System
Φ 60/100 - >
Φ 80/125 - 0.5
Φ 60/100
45° 1.0
90° 1.3
Φ 80/125
45° 1.0
90° 2.2
Separate
Flue
System
Φ 80/80
45° 1.4
90° 2.2
Note The adapter for Φ 60/100 mm ues or Φ 80/125 mm
ues is 0.5 m.

19Flue Options
EHC
Concentric Vertical Flue
Φ60/100 mm)
A
B
Standard ue system : A = 21 m
b) Extended vertical ue system (Φ 60/100 mm)
A
B
Minimum 350 mm
Total ue length :
A + B – (2 x 45° elbow) = 21 – 2 x 1 = 19.0 m
Diameter of
Pipe [mm]
Max Flue
Length [m]
Reduced Flue
Length [m]
Φ 60/100 21
(a/b)
45° 1.0
(b)
90° 1.3
Φ 80/125 70 45° 1.0
90° 2.2
Grey coloured numbers are used in the calculation of
this sample.

Flue Options
20 EHC
Fitting the Separate Flue System7.3
Separate Horizontal Flue
Extended separate horizontal fue system
(Φ80/80 mm)
D
E
B
A
C
F
Total ue length:
A + B + C + D + E + F – (4 x 90° elbow)
= 110 – 4 x 2.2 = 101.2 m
Diameter of
Pipe [mm]
Max Flue
Length [m] Reduced Flue Length [m]
Φ 80/80 110
(a/b)
45° 1.4(a)
90° 2.2
Grey coloured numbers are used in the calculation of this
sample.
Separate Vertical Flue
D
C
AB
Total ue length:
A + B + C + D – (2 x 45° elbow) = 110 – 2 x 1.4 = 107.2 m
Diameter of
Pipe [mm]
Max Flue
Length [m] Reduced Flue Length [m]
Φ 80/80 110
(a)
45° 1.4
90° 2.2
(a)
Grey coloured numbers are used in the calculation of this
sample.
Minimum 350 mm
1
.
4