EHC ECOSAVE 21K, ECOSAVE 25K, ECOSAVE 32K, ECOSAVE 37K Instruction 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
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.
Regulations
Competent Person's
Install and Commission
this appliance to
manufacturer's instructions
Complete the Benchmark
Checklist
If you notify via Gas
Scheme, Gas Safe will then
notify the relevant Local
Authority Building Control
Scheme on member's
behalf
Choose
Building
Route
Building Control
Contact your relevant Local
Authority Building Control
(LABC) who will arrange
an inspection or contact
a government approved
inspector
Install and Commission this
appliance to manufacturer's
instructions
Complete the Benchmark
Checklist
Scheme Members only
Contact Gas Safe or visit
www.gassaferegister.co.uk
You must ensure that the
by Gas Safe is written onto
the Benchmark Checklist
Gas Safe will record the data
of compliance to the
property
LABC will record the data
of compliance
2
Preface
EHC
Contents
1. Safety Considerations 4
1.1 Saf et y Denition s
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 Specications
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
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 CO
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
18.1 Wiring diagram
19. Parts List 43
19.1 Base Parts
19.2 Burner Parts
19.3 Water Way Parts
20. Appendix 47
Appendix 'A' Gas Conversion
Appendix 'B' Warranty Conditions
Appendix 'C' Commissioning Check List
Value
2
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 R elief Valve
12.5 Frost Protection
EHC
3Contents
Safety Considerations1.
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.
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
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
Note
Warns of a risk of material loss and
environmental pollution.
Indicates additional information that is
important but not related to personal injury
or property damage.
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 Considerations
4
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.
In GB, the appliance must be installed and commisioned by a
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.
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)
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 Specication 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
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.
EHC
5Safety Considerations
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
EHC Ecosave-21K(A)
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.
Maximum
Heating Output
19.3 kW 23.1 kW
Maximum
DHW Output
Central
Heating
(CH)
CH
ow
CH
return
Cold water
Domestic
hot water
Hot water tap
Domestic
Hot Water
(DHW)
Floor Heating Circuit or
Heating Circuit (Radiator)
Product Description
6
EHC
Layout and Key Components2.2
27
1
2
3
4
5
6
7
8
9
29
30
28
12
26
25
24
23
22
21
20
1 Expansion vessel
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
10
11
13
14
Control Panel2.3
temperature, the pressure in the heating
system, the operating mode and additional
functions.
2 CH temperature control knob
3 DHW temperature control knob
4 [MODE] button
5 [main ON/OFF] button
6 [RESET ] button
15
ow
16
17
19
18
12
3 654
EHC
7Product Description
Technical Data3.
Unit
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
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
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
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
Heating Water Connection mm 22
Connecting Diameter Domestic Hot and cold Water Connection mm 15
Gas Inlet Connection mm 22
Physical dimensions (Width × Depth × Height) mm 440 × 370 × 695
Technical Data
8
Ecosave
21K(A)
% 100.7 101.6 101.8 101.9
% 109.6 108.4 108.4 108.3
gkWeight 35 38
Ecosave
25K(A)
A
Ecosave
32K(A)
Ecosave
37K(A)
0.5
EHC
Hydraulic Data3.2
The following graph shows the development of the
Available Head Pump to the System
600
500
400
300
Head (mbar)
200
100
0
0 200 400 600 800 1000 1200 1400 1600 1800
Heating Flow Rate(l/h)
EHC
9Technical Data
Dimensions4.
698.8
745.7
Front view
110.4
376.3
10
Overhead view
37
255
Bottom view
366
All dimensions in mm
366.3
67.5
25.5
60
49.2
55
39.1
ABC E
6.1
122.5
440
D
60.4
75
10
Dimensions
A: Heating outlet 22mm
B: Heating inlet 22mm
C: Gas inlet 22mm
D: DHW outlet 15mm
E: Main water inlet 15mm
EHC
System Details5.
Operation Modes5.1
Circuit for CH (central heating) mode
Expansion
Vessel
Three-way
Valve
Ignition
Electrode
CH
Flow
CH
Return
Flame Sensing
Electrode
Heat
Exchanger
Circulation
Pump
Metal Fibre
Burner
Mixing Flow
Guide
Gas
Inlet
Blow Fan
Gas Valve
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
3.
set temperature.
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.
In this event re-pressurise the boiler to 1.5 bar
Note
The minimum operating
pressure can be adjusted in the
service menu.
80.0
70.0
60.0
50.0
40.0
30.0
Target primary temperature
20.0
20
15 10 5 0 -5 -10 -15 -20 -25
Outdoor Temperature (°C)
Relationship between primary and outdoor
K=1.5K=6 K=4 K=3 K=2
K=1
K=0.5
temperature: K-factor
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.
EHC
11System Details
Circuit for DHW (Domestic Hot Water) mode
Expansion
Vessel
Ignition
Electrode
Flame Sensing
Electrode
Heat
Exchanger
Circulation
Pump
Metal Fibre
Burner
Mixing Flow
Guide
Blow Fan
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 Heat 2.
Exchanger, and the water coming from the inlet is
heated.
The heating control function controls the burner until the 3.
DHW reaches the set temperature.
After DHW is used, the burner is extinguished and the 4.
three-way valve remains in the DHW mode position. The
mode.
When CH is demanded, the position of the three-way 5.
valve is changed to the CH mode position, and the system
returns to the CH mode.
Three-way
Valve
DHW Pre-heating mode
Ignition
Electrode
Expansion
Vessel
Heat
Exchanger
Three-way
Valve
DHW Heat
Exchanger
Flame Sensing
Electrode
Circulation
Pump
DHW Heat
Exchanger
Gas Valve
Gas
Inlet
Metal Fibre
Burner
Mixing Flow
Guide
Blow Fan
Gas Valve
DHW Water
outlet Inlet
Water
Flow
Sensor
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 Heat 1.
Exchanger. This pre-heats the unit in preparation for
DHW demand.
The burner is ON or OFF depending on the return 2.
temperature so that the set temperature is maintained.
Return Temp (°C)
Toff
Ton
Burner operation
MAX
MIN
DHW
pre-heating
mode
ONOFF
Time
System Details
12
Gas
Inlet
EHC
Installation Requirements6.
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.
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 specically 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.
Air Flow Checking
During the start-up sequence, the “no air check” function
supply.
EHC
13Installation Requirements
Required Minimum Clearances6.2
Ventilation6.3
appliance. The following minimum clearances (mm) must be
maintained for installing and servicing.
5 mm
440 mm
5 mm
250 mm
698.8 mm
200 mm
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 certied BSI or
VDE.
Cable : PVC insulated 0.75 mm
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 doublepole isolator with a contact separation of at least
3 mm for all the poles for servicing the appliance
and system controls only.
2
(24 × 0.2 mm) temperature
600 mm min
Case
Removal
Purposes
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
around local obstructions.
Installation Requirements
14
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.
EHC
Condensate Drain6.7
General instructions
Important
Note
This appliance is a high eciency 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 by 3.
limestone chipping
From the a4.
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.
The condensate must be drained from the
appliance in accordance with applicable
rules and regulations.
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.
ppliance to the drain/gully
CAUTION
Requirements for the condensate piping are as follows.
So that condensate can be properly drained the t
diameter of the plastic piping should be a minimum of
22 mm.
The condensate pipe should be made of a non-corrosive t
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 extend t
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 and t
vent stack, the plumbing eect must be considered.
If the pipes are easily aected 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 to t
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, the t
maximum length is 3 metres.
If the appliance is tted in an unheated location, the t
entire pipe system should be treated as an external run.
In order to prevent sagging, any external runs need to t
be propped up with supporting clips.
EHC
15Installation Requirements
Examples of available options for
condensate drain
1. From the appliance to the drain/gully via a sink
22 mm plastic
condensate
pipe
sink
2.5º minimum drop
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
External rain water
pipe into foul water
Internal soil
and vent stack
Drain/Gully
4. From the appliance to the gully
Visible air break
at pulg hole
Sink with
integral
100mm
overow
22 mm plastic
condensate pipe
75 mm
min.
75 mm sink
waste trap
The end of the pipe must be above water level
*
but below the surrounding surface.
Condensate drain termination
PRV
Frost proof
insulation
(if necessary)
Drain/Gully
Extarnal air break
22 mm plastic
condensate pipe
running through
the external wall
43 mm 90°
M &F bend
3. From the appliance to a soakaway hole surrounded by
limestone chipping
22 mm plastic condensate
drainage pipe, max extarnal
length 3 metres
500 mm min.
2.5º minimum drop
Hole depth
400 mm min.
(by 300 mmΦ)
Holes in the soakaway must face away from the
*
building.
Ground
level
Air gap
68 mmΦ PVC-u
strap on fitting
100 mm Φmin.
sealed plastic tube
Limestone
chippings
25 mm
Drainage
holes
Outside wall
Condensate
pipe
External
drain
Installation Requirements
16
EHC
8.6eulF
The minimum distances between the terminals and elements of
the building are as per the following.
A
G
BCD
F
J
H, I
A
A
A
E
G
L
K
N
L
K
Use of terminal guards needs to be considered.
Description
A
From openings (e.g. doors, windows, ventilation tiles)
B
Below gullies, down-pipes, or drain pipes
C
Below gutters
D
Below balconies
E
From down pipes
F
From external and internal corners
G
Above the ground, a roof or balconies
From the opposite wall of a carport (when another
H
ue is not installed)
From a terminal, that is facing the terminal, on the
I
opposite wall of a carport
Next to openings (e.g. doors, windows) within a
J
carport
K
Vertically away from a terminal on the same wall
L
Horizontally away from a terminal on the same wall
M
From an adjacent vertical ue pipe
N
From openings in a directly opposing building
*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.
B
F
M
G
F
F
Minimum
Distance
(cm)
30(*1)
7.5
20
20
2.5
30
30
60
120
120
150
30
50
200(*2)
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
Standard conditions are experimental values for the
capacities, fume temperature and air temperature for various
thermal power values. They represent dierent 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 all 3.
components.
Calculating the value of the total length.4.
Comparing the values with the maximum permissible 5.
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.
Note
EHC
For vertical ue pipes, the terminal must not be t
within 60 cm of any openings
17Installation Requirements
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