Lochinvar ECOKNIGHT EKW86CE Guide

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Models
EKW46CE
EKW61CE
EKW86CE
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
EKW236CE
ECOKNIGHT™
FLOOR STANDING GAS FIRED CONDENSING
CIRCULATING TYPE WATER HEATER
Installation, Commissioning, Maintenance
and User instructions
installation manual_ecoknight_february 2017

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Table of Contents
1.0 INTRODUCTION...................................................................................................................................................................................................................... 4
2.0 SAFETY GUIDELINES............................................................................................................................................................................................................. 5
2.1 General description of safety symbols used ....................................................................................................................................................................... 5
2.2 What to do if you smell gas................................................................................................................................................................................................ 6
3.0 PRINCIPAL PARTS................................................................................................................................................................................................................. 7
4.0 TECHNICAL DATA................................................................................................................................................................................................................ 10
5.0 DIMENSIONS AND CLEARANCE ......................................................................................................................................................................................... 11
5.1 DIMENSIONAL DRAWINGS ........................................................................................................................................................................................... 11
5.2 CLEARANCES................................................................................................................................................................................................................ 12
6.0 GENERAL REQUIREMENTS................................................................................................................................................................................................. 13
6.1 RELATED DOCUMENTS ................................................................................................................................................................................................ 13
7.0 WATER QUALITY ................................................................................................................................................................................................................. 14
8.0 LOCATION............................................................................................................................................................................................................................ 14
8.1 PLANT ROOM REQUIREMENTS.................................................................................................................................................................................... 14
8.2 GENERAL REQUIREMENTS .......................................................................................................................................................................................... 14
8.3 CLEARANCES................................................................................................................................................................................................................ 15
8.4 CONDENSATE DRAIN ................................................................................................................................................................................................... 15
9.0 GAS SUPPLY........................................................................................................................................................................................................................ 15
9.1 SERVICE PIPES............................................................................................................................................................................................................. 15
9.2 METERS ........................................................................................................................................................................................................................ 15
9.3 GAS SUPPLY PIPES ...................................................................................................................................................................................................... 15
9.4 BOOSTED SUPPLIES .................................................................................................................................................................................................... 15
9.5 PLANT-ROOM CONTROL VALVE .................................................................................................................................................................................. 15
9.6 EQUIPMENT GAS SYSTEM LEAK CHECK..................................................................................................................................................................... 16
10.0 FLUE SYSTEM...................................................................................................................................................................................................................... 17
10.1 FLUE SYSTEM GENERAL REQUIREMENTS ................................................................................................................................................................. 17
10.2 APPROVED FLUE SYSTEM ........................................................................................................................................................................................... 17
10.3 INSTALLATION PRECAUTIONS..................................................................................................................................................................................... 17
10.4 FLUE SYSTEM TECHNICAL DETAILS AND MAXIMUM FLUE LENGTH ......................................................................................................................... 18
10.5 FLUE DISCHARGE......................................................................................................................................................................................................... 18
10.6 CONDENSATE DRAIN ................................................................................................................................................................................................... 18
10.7 ROOM SEALED (TYPE C) FLUE ASSEMBLY................................................................................................................................................................. 20
10.8 INSTALLATION OF FLUE TRANSITION KIT TO EKW46CE –EKW61CE WATER HEATERS.......................................................................................... 24
10.9 INSTALLATION OF TRANSITION KIT TO EKW86CE-EKW116CE WATER HEATERS .................................................................................................... 26
10.10 INSTALLATION OF FLUE CONNECTION KIT TO EKW146CE-EKW176CE ............................................................................................................. 28
10.11 INSTALLATION OF FLUE CONNECTION KIT TO EKW206CE –EKW236CE........................................................................................................... 30
10.12 HORIZONTAL FLUE TERMINAL INSTALLATION .................................................................................................................................................... 32
10.13 FLUE TERMINAL GUARDING ................................................................................................................................................................................. 33
10.14 VERTICAL FLUE TERMINAL INSTALLATION.......................................................................................................................................................... 33
10.15 TYPE C43 (U duct).................................................................................................................................................................................................... 35
10.16 TYPE C53 (Twin pipe) ............................................................................................................................................................................................... 36
10.17 TYPE B23 (Conventional flue with fan assistance)...................................................................................................................................................... 39
11.0 AIR SUPPLY ......................................................................................................................................................................................................................... 40
11.1 COMBUSTION VENTILATION ........................................................................................................................................................................................ 40
11.2 COOLING VENTILATION................................................................................................................................................................................................ 40
12.0 WATER CONNECTIONS ....................................................................................................................................................................................................... 41
12.1 GENERAL ...................................................................................................................................................................................................................... 41
12.2 OPEN VENTED SYSTEM ARRANGEMENT.................................................................................................................................................................... 42
12.3 UN-VENTED SYSTEM ARRANGEMENT ........................................................................................................................................................................ 42
12.4 DE-STRATIFICATION..................................................................................................................................................................................................... 43
12.5 CIRCULATING PUMPS .................................................................................................................................................................................................. 43
12.6 HARD WATER AREAS ................................................................................................................................................................................................... 44
12.7 PRIMARY PIPEWORK HEADER SIZING ........................................................................................................................................................................ 44
13.0 CONTROL OPTIONS/INSTALLATION................................................................................................................................................................................... 45
13.1 vessel temperature sensor single water heater installation................................................................................................................................................ 45
13.1 vessel temperature sensor MULTIPLE water heater installation ........................................................................................................................................ 46
13.2 SENSOR WIRING........................................................................................................................................................................................................... 46
14.0 SCHEMATICS ....................................................................................................................................................................................................................... 46
14.1 key for schematics .......................................................................................................................................................................................................... 46
14.2 STANDALONE INSTALLATION, SINGLE WATER HEATER............................................................................................................................................ 47
14.1 BMS INSTALLATION, SINGLE WATER HEATER............................................................................................................................................................ 48
14.2 INSTALLATION, two WATER HEATERs with single vessel –alternate lead with strap-on sensor.................................................................................. 49
14.3 MULTIPLE WATER HEATERS WITH single vessel ......................................................................................................................................................... 50
14.4 MULTIPLE WATER HEATERS WITH MULTIPLE LST DIRECT STORAGE VESSELS ..................................................................................................... 51
15.0 ELECTRICAL SUPPLY.......................................................................................................................................................................................................... 52
15.2 EXTERNAL CONTROLS................................................................................................................................................................................................. 52
15.3 HIGH VOLTAGE CONNECTOR STRIP ........................................................................................................................................................................... 54
15.4 low VOLTAGE CONNECTOR STRIP............................................................................................................................................................................... 54
15.5 ELECTRICAL CONNECTIONS ....................................................................................................................................................................................... 56
15.6 FUSES ........................................................................................................................................................................................................................... 56
15.7 ARC WELDING PRECAUTIONS ..................................................................................................................................................................................... 56
15.8 WIRING DIAGRAM ......................................................................................................................................................................................................... 57
15.9 LADDER DIAGRAM ........................................................................................................................................................................................................ 58
16.0 SMART SYSTEM CONTROL................................................................................................................................................................................................. 59
16.1 GENERAL ...................................................................................................................................................................................................................... 59
16.2 SMART SYSTEM CONTROL PANEL.............................................................................................................................................................................. 59
16.3 ACCESS MODES ........................................................................................................................................................................................................... 59
16.4 SAVING PARAMETERS ................................................................................................................................................................................................. 60
16.5 STATUS DISPLAY SCREENS ........................................................................................................................................................................................ 62
17.0 COMMISSIONING AND TESTING ......................................................................................................................................................................................... 64
17.1 ELECTRICAL INSTALLATION ........................................................................................................................................................................................ 64
17.2 GAS INSTALLATION ...................................................................................................................................................................................................... 64

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17.3 WATER CONNECTIONS ................................................................................................................................................................................................ 64
17.4 COMMISSIONING THE EQUIPMENT ............................................................................................................................................................................. 64
17.5 TEMPERATURE ADJUSTMENT PROCEDURE .............................................................................................................................................................. 65
17.6 LEGIONELLA PREVENTION .......................................................................................................................................................................................... 66
17.7 PASTEURISATION ......................................................................................................................................................................................................... 66
17.8 PASTEURISATION USING THE NIGHT SET BACK FACILITY ........................................................................................................................................ 66
17.9 INSTALLATION NOISE ................................................................................................................................................................................................... 66
18.0 LPG FUEL ............................................................................................................................................................................................................................. 67
18.1 RELATED DOCUMENTS ................................................................................................................................................................................................ 67
18.2 CONVERSION TO LPG .................................................................................................................................................................................................. 67
18.3 LPG COMMISSIONING AND TESTING........................................................................................................................................................................... 72
19.0 MAINTENANCE..................................................................................................................................................................................................................... 73
19.1 GENERAL ...................................................................................................................................................................................................................... 73
19.2 MAINTENANCE SCHEDULE .......................................................................................................................................................................................... 73
19.3 BURNER INSPECTION .................................................................................................................................................................................................. 73
19.4 BURNER REMOVAL....................................................................................................................................................................................................... 74
19.5 CLEANING THE HEAT EXCHANGER............................................................................................................................................................................. 74
19.6 DRAINING WATER HEATER SYSTEM........................................................................................................................................................................... 74
19.7 REFILLING THE SYSTEM .............................................................................................................................................................................................. 75
19.8 OTHER CHECKS............................................................................................................................................................................................................ 75
20.0 SMART SYSTEM CONTROL SETTINGS............................................................................................................................................................................... 76
20.1 DISPLAY PANEL ACCESS MENU .................................................................................................................................................................................. 76
20.2 PARAMETER SETTING.................................................................................................................................................................................................. 77
21.0 VIEWABLE AND CHANGEABLE CONTROL PARAMETERS................................................................................................................................................ 80
21.1 GENERAL ...................................................................................................................................................................................................................... 80
21.2 DATA LOGGING............................................................................................................................................................................................................. 81
21.3 FUNCTIONS................................................................................................................................................................................................................... 81
21.4 DHW SETTINGS............................................................................................................................................................................................................. 82
21.5 ANTI-CYCLING............................................................................................................................................................................................................... 83
21.6 CONTROL MODES......................................................................................................................................................................................................... 83
21.7 BUILDING MANAGEMENT SYSTEM (BMS).................................................................................................................................................................... 85
21.8 CIRCULATION PUMPS .................................................................................................................................................................................................. 87
21.9 SERVICE NOTIFICATION............................................................................................................................................................................................... 87
21.10 BASIC SETUP ......................................................................................................................................................................................................... 88
22.0 ErP DATA TABLE ................................................................................................................................................................................................................. 89
23.0 USER INSTRUCTIONS.......................................................................................................................................................................................................... 90
23.1 GENERAL REQUIREMENTS .......................................................................................................................................................................................... 90
23.2 PROCEDURE FOR LIGHTING........................................................................................................................................................................................ 90
23.3 PROCEDURE FOR SHUTTING DOWN........................................................................................................................................................................... 90
23.4 SMART SYSTEM CONTROL .......................................................................................................................................................................................... 91
23.5 TEMPERATURE ADJUSTMENT PROCEDURE .............................................................................................................................................................. 91
23.6 MAINTENANCE.............................................................................................................................................................................................................. 92
23.7 AIR SUPPLY................................................................................................................................................................................................................... 92
23.8 SMART SYSTEM CONTROL .......................................................................................................................................................................................... 92
23.9 PARAMETER SETTINGS ............................................................................................................................................................................................... 92

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1.0 INTRODUCTION
The Lochinvar EcoKnight™ range is a floor standing direct gas fired circulating type condensing water
heater. The equipment comprises of stainless steel radial burner assembly and heat exchanger that permits
fully condensing operation. EcoKnight™ water heaters must be used in conjunction with an appropriately
sized LST direct storage vessel (available from Lochinvar Limited as an ancillary option)
The burner is initiated by a full electronic ignition sequence control that incorporates a spark ignition and a
flame rectification device for supervision of the flame.
The output from the water heater is regulated by a variable speed combustion fan and gas/air ratio controls
to maintain the correct combustion at all levels of modulation. This configuration allows modulation down to
20% of the rated output.
For the correct operation of the water heater, it is essential that a suitably sized pump is utilised to maintain a
constant water flow rate through the heat exchanger. A suitable shunt pump is supplied as an ancillary with
the water heater.
This equipment is intended for use on Group H Natural Gas (2nd Family) and LPG propane (3rd Family). The
information relating to propane firing is to be found in Section 18.0 LPG FUEL.
This equipment MUST NOT use gas other than that for which it has been designed and
adjusted.
This equipment must be installed by a competent person, registered with a H.S.E. approved body. All
installations must conform to the relevant Gas Safety and Building Regulations. Health & Safety
requirements must also be taken into account when installing any equipment. Failure to comply with the
above may lead to prosecution.
If the equipment is to be connected to an unvented (pressurised) system, care must be taken to ensure all
extra safety requirements are satisfied should a high or low-pressure condition occur in the system.
The equipment is designed for direct connection to a flue system.
Ancillary Options:
Primary Circulating Pump (EKW46CE & EKW61CE) Omega 3-80-2ZS
Primary Circulating Pump (EKW86CE) Omega 4-90-2ZS
Primary Circulating Pump (EKW116CE EKW146CE & EKW176CE) Omega 4-100-2ZS
Primary Circulating Pump (EKW206CE & EKW236CE) Omega 5-110-2ZS
LST Direct Storage Vessel (From 297 litre to 2820 litre) Contact Lochinvar Limited
Unvented/Boosted Water System Kits Contact Lochinvar Limited
De-stratification Pump Kit WH9
Condensate Neutralisation Kit KIT2000
Flue System Components See Section 10.0

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2.0 SAFETY GUIDELINES
READ AND UNDERSTAND THE INSTRUCTIONS
Read and fully understand all instructions before attempting to operate maintain or install the
unit.
Keep these instructions near the water heater for quick reference.
This equipment must be installed by a competent person, registered with the H.S.E. approved body. All installations
must conform to the relevant Gas Safety and Building Regulations. Health & Safety requirements must also be
taken into account when installing any equipment. Failure to comply with the above may lead to prosecution
Without written approval of the manufacturer the internals of the water heater may not be changed. When changes are
executed without approval, the water heater certification becomes invalid.
Commissioning, maintenance and repair must be done by a skilled installer/engineer, according to all applicable
standards and regulations.
2.1 GENERAL DESCRIPTION OF SAFETY SYMBOLS USED
BANNED
A black symbol inside a red circle with a red diagonal indicates an action that should not be
performed
WARNING
A black symbol added to a yellow triangle with black edges indicates danger
ACTION REQUIRED
A white symbol inserted in a blue circle indicates an action that must be taken to avoid risk
ELECTRICAL HAZARD
Observe all signs placed next to the pictogram. the symbol indicates components of the unit
and actions described in this manual that could create an electrical hazard.
HOT SURFACES
The symbol indicates those components with a high surface temperature that could create a
risk.
This symbol shows essential information which is not safety related
Recover or recycle material

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2.2 WHAT TO DO IF YOU SMELL GAS
Warning if you smell gas
No naked flames, no smoking!
Avoid causing sparks, do not switch on or off electrical equipment or lights
Open windows and doors
Shut off the main gas supply
Warn occupants and leave the building
After leaving the building alert the local gas supply company
Do not re-enter the building until it is safe to do so
Lochinvar Limited is not liable for any damage caused by inaccurately following these
installation instructions. Only original parts may be used when carrying out any repair or
service work.
This appliance is not intended for use by persons (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been
given supervision or instruction concerning use of the appliance by a person responsible for
their safety. Children should be supervised to ensure that they do not play with the appliance.

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3.0 PRINCIPAL PARTS
ITEM
DESCRIPTION
FUNCTION
1
Stainless steel heat exchanger
Allows water to flow through specially designed coils for maximum heat transfer, while providing
protection against flue gas corrosion. The coils are encased in a jacket that contains the
combustion process.
2
Heat exchanger access cover
Allows access to the combustion side of the heat exchanger coils.
3
Fan
The fan pulls in air and gas through the venturi (item 5). Air and gas mix inside the fan and are
pushed into the burner, where they burn inside the combustion chamber.
4
Gas valve
The gas valve senses the negative pressure created by the fan, allowing gas to flow only if the gas
valve is powered and combustion air is flowing.
5
Venturi
The venturi controls air and gas flow into the burner.
6
Flue gas sensor
This sensor monitors the flue gas exit temperature. The control module will modulate and shut
down the water heater if the flue gas temperature gets too hot. This protects the flue pipe from
overheating.
7
Water heater outlet temperature
sensor
This sensor monitors water heater outlet water temperature.
8
Water heater inlet temperature
sensor
This sensor monitors return water temperature.
9
Electronic display
The electronic display consists of 7 buttons and a dual line 32-character liquid crystal display.
10
Flue pipe adapter
Allows for the connection of the flue system to the water heater.
11
Burner (not shown)
Made with metal fibre and stainless steel construction, the burner uses pre-mixed air and gas and
provides a wide range of firing rates.
12
Water outlet
BSP water connection that supplies hot water to the system, either 1-1/4" or 2", depending on the
model.
13
Water inlet
BSP water connection that returns water from the system to the heat exchanger, either 1-1/4" or
2", depending on the model.
14
Gas connection pipe
Threaded pipe connection, 1/2 “, 3/4", or 1", depending on the model. This pipe should be
connected to the incoming gas supply for the purpose of delivering gas to the water heater.
15
SMART Control Module
The SMART Control responds to internal and external signals and controls the fan, gas valve, and
pumps to meet the demand.
16
Manual air vent
Designed to remove trapped air from the heat exchanger coils.
17
Air intake adapter
Allows for the connection of the air intake pipe to the water heater.
18
Mains voltage junction box
The junction box contains the connection points for the mains voltage power and all pumps.
19
Water heater drain port
Location from which the heat exchanger can be drained.
20
Low voltage connection board
The connection board is used to connect external low voltage devices.
21
Low voltage wiring connections
(knockouts)
Conduit connection points for the low voltage connection board.
22
Condensate drain connection
Connects the condensate drain line to a 1/2" PVC union.
23
Access cover - front
Provides access to the gas train and the heat exchanger.
24
Ignition electrode
Provides direct spark for igniting the burner.
25
Flame inspection window
The quartz glass window provides a view of the burner surface and flame.
26
Gas shutoff valve
Manual valve used to isolate the gas valve from the gas supply.
27
High limit sensor
Device that monitors the outlet water temperature. If the temperature exceeds its setting, it will
break the control circuit, shutting the water heater down.
28
Flame sense electrode
Used by the control module to detect the presence of burner flame.
29
Mains voltage wiring connections
(knockouts)
Conduit connection points for the mains voltage junction box
30
Top panel
Removable panel to gain access to the internal components.
31
Power switch
Turns 230 VAC ON/OFF to the water heater.
32
Levelling legs
Used to allow the heat exchanger to be levelled. This is needed for the proper draining of the
condensate from the combustion chamber
3.1.1 PRINCIPLE PARTS LIST TO BE USED IN CONJUNCTION WITH 3.1.2

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3.1.2 PRINCIPLE PARTS SHOWN, TO BE USED WITH 3.1.1
FRONT VIEW ALL MODELS
REAR VIEW MODELS EKW46CE-EKW61CE
REAR VIEW MODELS EKW86CE-EKW116CE
LEFT SIDE VIEW MODELS EKW86CE-EKW116CE

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REAR VIEW MODEL EKW146CE
RIGHT SIDE VIEW MODEL EKW146CE
REAR VIEW MODELS EKW176CE-EKW236CE
SIDE VIEW MODELS EKW176CE-EKW236CE

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4.0 TECHNICAL DATA
Model Number
EKW46CE
EKW61CE
EKW86CE
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
GENERAL DATA
Product I.D. Number
CE 0063 CQ3351
Classification
112H31B/P
Input (gross) –kW
44
61.5
83.5
116.9
146.5
175.8
205.2
234.5
Input (net) –kW
39.6
55.4
75.2
105.3
132
158.4
184.9
211.3
Recovery Rate (44° ΔT)
–l/hr
806
1153
1567
2164
2768
3302
3865
4338
Recovery Rate (50° ΔT)
–l/hr
709
1014
1379
1904
2436
2905
3401
3819
Heat generator seasonal
efficiency –%
96.4
95.6
95.6
93.2
96.7
95
95.1
95.3
Shipping Weight –kg
75
79
102
129
138
154
168
184
NOX@0%O2- mg/kWh
39
39
39
39
39
39
39
39
GAS DATA –G20
Nominal gas inlet
pressure –mbar
20
Maximum gas inlet
pressure –mbar
25
Minimum gas inlet
pressure –mbar
17.5
Gas flow rate –m3/hr
4.2
5.9
8
11.1
14
16.8
19.6
22.3
Flue gas mass rate –
g/sec
16
22.3
30.4
42.5
53.2
63.9
74.6
85.2
(@ 9.0% CO2)
Gas inlet connection
size –“ BSP
½
½
¾
1
1
1
1
1
GAS DATA –G31
Nominal gas inlet
pressure –mbar
37
Maximum gas inlet
pressure –mbar
45
Minimum gas inlet
pressure –mbar
27
Gas flow rate –m3/hr
1.7
2.3
3.1
4.4
5.5
6.6
7.7
8.8
Flue gas mass rate –
g/sec
16.7
23.2
31.6
44.2
55.4
66.6
77.6
88.8
(@ 10.5% CO2)
Gas inlet connection
size –“ BSP
½
½
¾
1
1
1
1
1
ELECTRICAL DATA
Power consumption -W
120
144
180
180
204
322
322
322
Power supply
Single phase 230v/50Hz
Protection class
IP00
WATER DATA
Water content –litres
4.9
6.4
9.1
12.9
15.9
15.9
18.9
21.6
Water connections
(F & R) –“ BSP
1 ¼
2
Max. water pressure
(PMS) –bar
11
Min. water pressure –
bar
0.5
Test pressure –bar
16.5
Maximum water
temperature –C
80

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5.0 DIMENSIONS AND CLEARANCE
5.1 DIMENSIONAL DRAWINGS
Note full dimensional drawings showing connection sizes and positions are available from Lochinvar Technical
Support
5.1.1 DIMENSIONAL DRAWING MODEL EKW46CE-EKW61CE
5.1.2 DIMENSIONAL DRAWING MODELS,EKW86CE,EKW116CE,EKW146CE,EKW176CE,EKW206CE,EKW236CE
Model
Dimension
Unit
EKW46CE
EKW61CE
EKW86CE
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
A
mm
845
845
1080
1080
1080
1080
1080
1080
B
mm
457
565
502
686
794
921
1022
1149
C
mm
701
701
641
824
916
1059
1153
1153
D
mm
394
394
394
394
394
394
394
394

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5.2 CLEARANCES
5.2.1 ENCLOSURE INSTALLATION CLEARANCES (MM)
5.2.2 PLANT-ROOM INSTALLATION CLEARANCES (MM)
400
400

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6.0 GENERAL REQUIREMENTS
The Lochinvar EcoKnight™ condensing water heater has been designed to operate trouble free for many years.
These instructions should be followed closely to obtain the maximum usage and efficiency of the equipment.
READ AND UNDERSTAND THE INSTRUCTIONS
Read and fully understand all instructions before attempting to operate maintain or install the unit.
6.1 RELATED DOCUMENTS
It is law that all gas appliances are installed by competent persons, in accordance with The Gas Safety (Installation
and Use) Regulations 1998. Failure to install appliances correctly could lead to prosecution. It is in your own interest,
and that of safety, to ensure that this law is complied with.
The installation of the equipment MUST be in accordance with the relevant requirements of the Gas Safety
Regulations, Building Regulations, I.E.E. Regulations and the bylaws of the local water undertaking. The installation
should also be in accordance with any relevant requirements of the local gas distributor and local authority.
In addition the installation should follow the relevant guidance offered in the following documents. It is not practical to
list all relevant information but emphasis is placed on the following documents, as failure to comply with the guidance
given will almost certainly result in an unsatisfactory installation:
Regulation
Description
BS EN 1858: 2008 + A1: 2011
Chimneys, Components. Concrete flue blocks.
BS 5440-1: 2008
Flueing and ventilation for gas appliances of rated input not exceeding 70 kW net (1st, 2nd and 3rd
family gases). Specification for installation of gas appliances to chimneys and for maintenance of
chimneys.
BS 5440-2: 2009
Installation and maintenance of flues and ventilation for gas appliances of rated input not exceeding
70 kW net (1st, 2nd and 3rd family gases). Specification for installation and maintenance of
ventilation for gas appliances.
BS 6644: 2011
Specification for Installation of gas-fired hot water Heaters of rated inputs between 70 kW (net) and
1.8 MW (net) (2nd and 3rd family gases).
BS 6700: 2006 +A1: 2009
Design, installation, testing and maintenance of services supplying water for domestic use within
buildings and their curtilages.
BS 6877: 1988 Parts 1, 2 and 3
Code of practice for low temperature hot water systems of output greater than 45 kW.
BS 7074: 1989 Parts 1 and 2
Application, selection and installation of expansion vessels and ancillary equipment for sealed
systems.
BS 7671: 2008 + A1: 2011
Requirements for electrical installations, I.E.E. wiring regulations seventeenth edition.
BS 7671: Amendment 2: August 2013
BS EN 12828:2012+A1:2014
Heating systems in buildings. Design for water-based heating systems.
CP 342 (Part 2 1974):
Code of practice for centralised hot water supply-buildings other than dwellings.
Institute of Gas Engineers and Managers (IGEM) Publications
IGE/UP/1 - Edition 2:
Installation pipework on industrial and commercial premises.
IGE/UP/2 –Edition 2
Gas installation pipework, boosters and compressors on industrial and commercial premises.
IGE/UP/4 - Edition 3:
Commissioning of gas-fired plant on industrial and commercial premises.
IGE/UP/10 - Edition 3:
Installation of flued gas appliances in industrial and commercial premises.
Gas Safety (Installation and Use) Regulations 1998
CIBSE: Guides
Part A Environmental Design
Part G Public health engineering
H.S.E. guidance
INDG 436 Safe management of industrial steam & hot water Water Heaters
SAFED BG01Guidance on safe operation of Water Heaters
Third edition of the 1956 Clean Air Act Memorandum on Chimney Heights
Manufacturer's notes must not be taken in any way as overriding statutory obligations.

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7.0 WATER QUALITY
Water Quality /Hard Water
Water supply quality may adversely affect the efficiency performance and longevity of Water Heaters and Hot Water
systems. Hard water may cause the formation of limescale which will reduce operating efficiency and may cause
early product failure. Please note the following:-
Water Hardness –should not exceed 205ppm CaCO3 and Total Dissolved Solids (TDS) of untreated water
should not exceed 350ppm.
If these values are exceeded a water treatment specialist should be consulted. Water Softeners and Water
Conditioners may be considered, but whichever method is selected, it should be suitable for installation
with Direct Gas-fired Water Heaters. A maintenance regime will also be required for such systems
High hot water temperature and high demand for hot water is likely to cause quicker limescale formation
The formation of limescale or other solids can cause a blockage within the heat exchanger,
which in turn may cause premature failure. Such instances are not regarded as defects in
manufacture and will not be covered under the product warranty.
Additional note:-
See also section 12.0 (pages 43 & 44) in this Instruction manual, for additional guidance on Primary Circulating
Pumps, Flow Rates and Pipework headers
8.0 LOCATION
8.1 PLANT ROOM REQUIREMENTS
The Lochinvar EcoKnight™ may only be installed in a room that complies with the appropriate ventilation
requirements.
The Lochinvar EcoKnight™ can be used as a type C13, C33, C43 or C53 (room sealed) appliance. Due to its room
sealed design, ventilation allowances for combustion air are not necessary, provided the minimum clearances and
service clearances as detailed in 5.2.2 are observed. If the appliance is to be installed in a compartment or a hot
environment, the minimum clearances detailed in 5.2.1 should be observed. In addition to this, ventilation for cooling
purposes must be fitted. For further guidance, please refer to Section 11.0 or to BS5440-2 or BS6644 as
appropriate.
The Lochinvar EcoKnight™ can also be used as a type B23 (open flue) appliance. If such a configuration is to be
used, then appropriate ventilation for cooling and combustion must be provided. For further details, please refer to
Section 11.0 or to BS5440-2 or BS6644 as appropriate.
8.2 GENERAL REQUIREMENTS
Corrosion of the heat exchanger coils and flue system may occur if air for combustion contains certain chemical
vapours. Such corrosion may result in poor combustion and create a risk of asphyxiation. Aerosol propellants,
cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool chemicals, calcium and sodium
chloride, waxes and process chemicals are corrosive. Products of this sort should not be stored near the water
heater or outside by the air intake (if applicable). The fitting of this equipment in a situation where aerosols or other
chemicals may be entrained into the combustion air will invalidate the warranty.
The equipment must be installed on a level surface that is capable of adequately supporting its weight (when filled
with water) and any ancillary equipment. The operation of the equipment must not cause the temperature of any
combustible material in the vicinity of the equipment and its flue to exceed 65°C. If such a situation is unavoidable,
appropriate insulation should be provided.
Locate the equipment so that if the appliance or any connecting pipework should leak, water damage will not occur.
When such locations cannot be avoided it is recommended that a suitable drain pan be installed under the
equipment. The pan should be adequately drained but must not restrict the combustion or ventilation airflow.

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8.3 CLEARANCES
The location chosen for the equipment must permit the provision for a satisfactory flue system and, where necessary,
an adequate air supply. The location must also provide adequate space for servicing and air circulation around each
unit. This includes any electrical trunking laid across the floor and to the appliance.
See Section 5.2.1 DIMENSIONS/CLEARANCES. Further details regarding locations are given in BS5440 or
BS6644 as appropriate.
8.4 CONDENSATE DRAIN
The condensate drain is located on the left hand side of the water heater. It is fitted with a ½” PVC tee and union, this
should be connected to an appropriate condensate drain, sloping continuously away from the water heater at an
angle of at least 3(50mm per metre).
The Water Resources Act requires that trade effluent is discharged to municipal sewers between pH 6.5 and 10.0. If
it is determined that these levels cannot be achieved, an in-line condensate neutralisation kit is available from
Lochinvar Limited. This unit is capable of neutralising 4000 litres of condensate to a pH of 7.0 before releasing it to a
drain.
9.0 GAS SUPPLY
The Lochinvar EcoKnight™ range is suitable for use on second and third family gasses 2H - G20 - 20mbar and 3P -
G31 - 37mbar. Details relating to Natural Gas (2H) appear below; for details relating to Propane (3P) please refer
to Section 18.0: LPG FUEL.
9.1 SERVICE PIPES
The local gas distributor must be consulted at the installation planning stage in order to establish the availability of an
adequate supply of gas. An existing service pipe must not be used without prior consultation with the local gas
distributor.
9.2 METERS
A new gas meter will be connected to the service pipe by the local gas distributor contractor. An existing gas meter
should be checked, preferably by the gas distributor, to ensure that it is adequate to deal with the rate of gas supply
required.
9.3 GAS SUPPLY PIPES
Supply pipes must be fitted in accordance with IGE/UP/2. Pipework from the meter to the equipment must be of
adequate size. The complete installation must be purged and tested as described in IGE/UP/1. Refer to Section
17.LPG FUEL for information on LPG pipework installation guidance.
9.4 BOOSTED SUPPLIES
Where it is necessary to employ a gas pressure booster, the controls must include a low-pressure cut-off switch at the
booster inlet. The local gas distributor must be consulted before a gas pressure booster is fitted. For details of how
to connect a low-pressure cut-off switch, please refer to Section 15.4.2
9.5 PLANT-ROOM CONTROL VALVE
A manual valve for plant-room isolation must be fitted in the gas supply line. It must be clearly identified and readily
accessible for operation, preferably by an exit.

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9.6 EQUIPMENT GAS SYSTEM LEAK CHECK
An approved gas-inlet appliance isolating valve and union should be installed for each unit in a convenient
and safe position and be clearly marked. Ensure that the gas-inlet appliance isolating valve is in the OFF position.
Although the equipment receives a gas leak check and gas train component integrity check prior to leaving the
factory, transit and installation may cause disturbance to unions, fittings and components. During commissioning a
further test for tightness should be carried out on the equipment gas pipework and components.
Care must be taken not to allow leak detection fluid on or near any electrical parts or
connections.

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10.0 FLUE SYSTEM
All versions of the EcoKnight™ Condensing water heater can be installed as either type B23 (fan assisted open flue)
or C13, C33, C53 (room sealed) appliances. See the relevant section for details of each flue type and requirements.
10.1 FLUE SYSTEM GENERAL REQUIREMENTS
Detailed recommendations for the flue system are given in BS5440-1 for equipment of rated input not exceeding
70kW net, BS6644 for equipment above 70kW net and IGE/UP/10 for equipment of rated input above 54kW net. The
following notes are intended to give general guidance only.
10.2 APPROVED FLUE SYSTEM
The approved flue system is not suitable for use external to the building. If external routes
cannot be avoided, a flue system manufacturer should be consulted to supply a suitable
alternative.
When used as a type C (room sealed) appliance, the approved, purpose designed adaptive flue system should be
used. For further details, please contact Lochinvar Limited.
When used as a Type B (open flued) appliance, a suitable flue system constructed of Stainless Steel or
Polypropylene with a temperature rating in excess of 120C should be used.
Aluminium flue pipe must not be used on this appliance as it may lead to premature failure of
the heat exchanger and will invalidate the warranty.
10.3 INSTALLATION PRECAUTIONS
The approved flue system is rated to 120C max. To prevent the exhaust temperature exceeding this, the
appliance is supplied with a flue gas temperature sensor.
This must be fitted during the installation of the flue system. Failure to do so may lead to severe
personal injury, death or substantial property damage.
The water heater must not be operated unless the complete flue system is installed. This includes the
water heater connections, concentric adaptor (if required) flue pipes, air ducts (if required) and terminals. If
discharging at low level, a suitable flue guard must be installed.
Due to the condensing nature of the water heater, long external runs should be avoided to prevent the
condensate freezing within the flue system.
During assembly precaution should be taken to ensure that the internal sealing ring is seated correctly.
Due to the close tolerances in the flue system, it may be necessary to use a twisting action to fit the joints
together. No lubrication other than water should be used.

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10.4 FLUE SYSTEM TECHNICAL DETAILS AND MAXIMUM FLUE LENGTH
Model Number
EKW46CE
EKW61CE
EKW86CE
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
FLUE DATA TYPE B23
Nominal flue diameter –mm
80
100
150
Maximum flue gas temp. –C
120
Maximum equivalent length –m
60
Equivalent length 90bend –mm
1000
1500
Equivalent length 45bend –mm
500
900
Flue gas temperature –C
70
Flue draught requirements –mbar
-0.03 to -0.1
FLUE DATA TYPE C13 & C33
Nominal flue diameter –mm
80/125
100/150
N/A see note below ‡
Maximum flue gas temp. –C
120
Maximum equivalent length –m
30
30‡
Equivalent length 90bend –mm
1000
1500
Equivalent length 45bend –mm
500
900
FLUE DATA TYPE C43 & C53
Nominal flue diameter –mm
80
100
150
Average flue gas temp. –C
70
(80/60 Flow/Return)
Maximum flue gas temp. –C
120
Maximum equivalent length –m
60*
Equivalent length 90bend –mm
1000
1500
Equivalent length 45bend –mm
500
900
10.4.1 FLUE SYSTEM TECHNICAL DATA TABLE
‡ EKW146CE, EKW176CE, EKW206CE and EKW236CE use a Twin pipe (Parallel) flue system
terminating at a concentric terminal. The flue system is to be constructed from 150mm single wall
components.
* On twin pipe systems, the maximum equivalent length is the sum of the air inlet components and the
exhaust components.
10.5 FLUE DISCHARGE
The flue system must ensure safe and efficient operation of the equipment to which it is attached, protect the
combustion process from wind effects and disperse the products of combustion to open external air.
The flue must terminate in a freely exposed position and be so situated as to prevent the products of combustion
entering any opening in a building. For installations with a total output above 200kW the clean air act should be
consulted and complied with.
Under certain operating and weather conditions, the EcoKnight™ water heater may generate a plume at the terminal.
Consideration should be given to the nuisance this may cause and the terminal should be sited accordingly.
For further information on terminal locations, please refer to Section 10.6.1 FLUE TERMINAL POSITIONS.
10.6 CONDENSATE DRAIN
If the flue system rises at an angle of at least 3(50mm per metre), no additional condensate drain will be required.
Failure to provide an adequate rise in the flue system may lead to pooling of condensate which may lead to
premature failure of the flue system.

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10.6.1 FLUE TERMINAL POSITIONS
Location
Description
EKW46CE –EKW61CE
EKW86CE –EKW236CE
A
Directly below an opening, air brick, opening windows etc.
300
2000
B
Above an opening, air brick, opening windows etc.
300
1000
C
Horizontally to an opening, air brick, opening windows etc.
300
1000
D
Below a gutter or sanitary pipework
75
75
E
Below the eaves
200
200
F
Below a balcony or car port roof
200
200
G
From a vertical drain or soil pipe
150
150
H
From an internal or external corner
300
300
I
Above ground, roof or balcony level
300
300
J
From a surface facing the terminal
600
1000
K
From a terminal facing the terminal
1200
2000
L
From an opening in the car port (e.g. door, window) into the
dwelling
1200
1200
M
Vertically from a terminal on the same wall
1500
1500
N
Horizontally from a terminal on the same wall
300
600
P
From a vertical structure on the roof
300
300
Q
Above intersection with the roof
300
300
10.6.2 FLUE TERMINAL MINIMUM DISTANCES

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10.7 ROOM SEALED (TYPE C) FLUE ASSEMBLY
10.7.1 GENERAL CONCENTRIC FLUE SYSTEM INSTALLATION GUIDELINES
Do not drill and screw
into flue system