Lochinvar ECOKNIGHT EKW116CE Guide

1
Models
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
ECOKNIGHT™
FLOOR STANDING GAS FIRED CONDENSING
CIRCULATING TYPE WATER HEATER
Installation, Commissioning, Maintenance
and User instructions

2
Article
Language
Version
EcoKnight condensing water heater models 116-236 ICM
English
October 2022

3
Table of Contents
1.0 INTRODUCTION...................................................................................................................................................................................................................... 5
2.0 SAFETY GUIDELINES............................................................................................................................................................................................................. 6
GENERAL DESCRIPTION OF SAFETY SYMBOLS USED ................................................................................................................................................ 6
WHAT TO DO IF YOU SMELL GAS .................................................................................................................................................................................. 7
3.0PRINCIPAL PARTS................................................................................................................................................................................................................. 8
4.0 TECHNICAL DATA................................................................................................................................................................................................................ 11
5.0 DIMENSIONS AND CLEARANCE ......................................................................................................................................................................................... 13
DIMENSIONAL DRAWINGS ........................................................................................................................................................................................... 13
CLEARANCES................................................................................................................................................................................................................ 15
6.0 GENERAL REQUIREMENTS................................................................................................................................................................................................. 16
RELATED DOCUMENTS ................................................................................................................................................................................................ 16
7.0 WATER QUALITY ................................................................................................................................................................................................................. 17
8.0 LOCATION............................................................................................................................................................................................................................ 17
PLANT ROOM REQUIREMENTS.................................................................................................................................................................................... 17
GENERAL REQUIREMENTS .......................................................................................................................................................................................... 17
CLEARANCES................................................................................................................................................................................................................ 18
CONDENSATE DRAIN ................................................................................................................................................................................................... 18
9.0 GAS SUPPLY........................................................................................................................................................................................................................ 18
SERVICE PIPES............................................................................................................................................................................................................. 18
METERS ........................................................................................................................................................................................................................ 18
GAS SUPPLY PIPES ...................................................................................................................................................................................................... 18
BOOSTED SUPPLIES .................................................................................................................................................................................................... 18
PLANT-ROOM CONTROL VALVE .................................................................................................................................................................................. 18
EQUIPMENT GAS SYSTEM LEAK CHECK..................................................................................................................................................................... 18
10.0 FLUE SYSTEM...................................................................................................................................................................................................................... 19
FLUE SYSTEM GENERAL REQUIREMENTS ................................................................................................................................................................. 19
FLUE SYSTEM TECHNICAL DETAILS AND MAXIMUM FLUE LENGTH ......................................................................................................................... 20
FLUE DISCHARGE......................................................................................................................................................................................................... 21
CONDENSATE DRAIN ................................................................................................................................................................................................... 21
APPROVED FLUE SYSTEM ........................................................................................................................................................................................... 22
INSTALLATION PRECAUTIONS..................................................................................................................................................................................... 22
ROOM SEALED (TYPE C) FLUE ASSEMBLY ................................................................................................................................................................. 23
INSTALLATION OF TRANSITION KIT TO EKW116CE WATER HEATERS...................................................................................................................... 23
INSTALLATION OF FLUE CONNECTION KIT TO EKW146CE-EKW176CE..................................................................................................................... 25
INSTALLATION OF FLUE CONNECTION KIT TO EKW206CE –EKW236CE........................................................................................................... 27
C13 CONCENTRIC HORIZONTAL FLUE SYSTEMS................................................................................................................................................ 29
HORIZONTAL FLUE TERMINAL INSTALLATION .................................................................................................................................................... 30
FLUE TERMINAL GUARDING ................................................................................................................................................................................. 31
C33 CONCENTRIC VERTICAL FLUE SYSTEMS ..................................................................................................................................................... 31
VERTICAL FLUE TERMINAL INSTALLATION.......................................................................................................................................................... 33
ROOM SEALED (TYPE C) FLUE ASSEMBLY.......................................................................................................................................................... 34
TYPE C43 COMMON VENTED FLUE SYSTEMS IN MULTI FLOOR BUILDINGS ....................................................................................................... 38
C53 (TWIN PIPE) FLUE SYSTEMS ........................................................................................................................................................................... 38
TYPE B23 (CONVENTIONAL FLUE WITH FAN ASSISTANCE) ................................................................................................................................. 43
C63 CERTIFIED FLUE SYSTEMS ........................................................................................................................................................................... 45
11.0 AIR SUPPLY ......................................................................................................................................................................................................................... 46
COMBUSTION VENTILATION ........................................................................................................................................................................................ 46
COOLING VENTILATION................................................................................................................................................................................................ 46
12.0 WATER CONNECTIONS ....................................................................................................................................................................................................... 47
GENERAL ...................................................................................................................................................................................................................... 47
OPEN VENTED SYSTEM ARRANGEMENT.................................................................................................................................................................... 48
UN-VENTED SYSTEM ARRANGEMENT ........................................................................................................................................................................ 48
DE-STRATIFICATION..................................................................................................................................................................................................... 49
CIRCULATING PUMPS .................................................................................................................................................................................................. 49
PRIMARY PIPEWORK HEADER SIZING ........................................................................................................................................................................ 50
13.0 CONTROL OPTIONS/INSTALLATION................................................................................................................................................................................... 51
VESSEL TEMPERATURE SENSOR SINGLE WATER HEATER INSTALLATION ............................................................................................................ 51
1.1 VESSEL TEMPERATURE SENSOR MULTIPLE WATER HEATER INSTALLATION ........................................................................................................ 52
SENSOR WIRING........................................................................................................................................................................................................... 52
14.0 SCHEMATICS ....................................................................................................................................................................................................................... 52
1.1 KEY FOR SCHEMATICS ................................................................................................................................................................................................ 52
STANDALONE INSTALLATION, SINGLE WATER HEATER............................................................................................................................................ 53
1.1 BMS INSTALLATION, SINGLE WATER HEATER............................................................................................................................................................ 54
INSTALLATION, TWO WATER HEATERS WITH SINGLE VESSEL –ALTERNATE LEAD WITH STRAP-ON SENSOR ................................................... 55
MULTIPLE WATER HEATERS WITH SINGLE VESSEL .................................................................................................................................................. 56
MULTIPLE WATER HEATERS WITH MULTIPLE LST DIRECT STORAGE VESSELS ..................................................................................................... 57
15.0 ELECTRICAL SUPPLY.......................................................................................................................................................................................................... 58
EXTERNAL CONTROLS................................................................................................................................................................................................. 58
BUILDING MANAGEMENT SYSTEM (BMS).................................................................................................................................................................... 59
HIGH VOLTAGE CONNECTOR STRIP ........................................................................................................................................................................... 60
LOW VOLTAGE CONNECTOR STRIP............................................................................................................................................................................ 60
ELECTRICAL CONNECTIONS ....................................................................................................................................................................................... 62
FUSES ........................................................................................................................................................................................................................... 62
ARC WELDING PRECAUTIONS ..................................................................................................................................................................................... 62
WIRING DIAGRAM ......................................................................................................................................................................................................... 63
LADDER DIAGRAM................................................................................................................................................................................................. 64
16.0 SMART SYSTEM CONTROL................................................................................................................................................................................................. 65
GENERAL ...................................................................................................................................................................................................................... 65
SMART SYSTEM CONTROL PANEL.............................................................................................................................................................................. 65
ACCESS MODES ........................................................................................................................................................................................................... 65
SAVING PARAMETERS ................................................................................................................................................................................................. 66
STATUS DISPLAY SCREENS ........................................................................................................................................................................................ 68
17.0 COMMISSIONING AND TESTING ......................................................................................................................................................................................... 70
ELECTRICAL INSTALLATION ........................................................................................................................................................................................ 70
GAS INSTALLATION ...................................................................................................................................................................................................... 70

4
WATER CONNECTIONS ................................................................................................................................................................................................ 70
COMMISSIONING THE EQUIPMENT ............................................................................................................................................................................. 70
TEMPERATURE ADJUSTMENT PROCEDURE .............................................................................................................................................................. 71
LEGIONELLA PREVENTION .......................................................................................................................................................................................... 72
PASTEURISATION ......................................................................................................................................................................................................... 72
PASTEURISATION USING THE NIGHT SET BACK FACILITY ........................................................................................................................................ 72
INSTALLATION NOISE ................................................................................................................................................................................................... 72
18.0 LPG FUEL ............................................................................................................................................................................................................................. 73
RELATED DOCUMENTS ................................................................................................................................................................................................ 73
CONVERSION TO LPG .................................................................................................................................................................................................. 73
LPG COMMISSIONING AND TESTING........................................................................................................................................................................... 77
19.0 MAINTENANCE..................................................................................................................................................................................................................... 77
GENERAL ...................................................................................................................................................................................................................... 77
MAINTENANCE SCHEDULE .......................................................................................................................................................................................... 77
BURNER INSPECTION .................................................................................................................................................................................................. 78
BURNER REMOVAL....................................................................................................................................................................................................... 78
CLEANING THE HEAT EXCHANGER............................................................................................................................................................................. 78
DRAINING WATER HEATER SYSTEM........................................................................................................................................................................... 79
REFILLING THE SYSTEM .............................................................................................................................................................................................. 79
OTHER CHECKS............................................................................................................................................................................................................ 79
20.0 SMART SYSTEM CONTROL SETTINGS............................................................................................................................................................................... 81
DISPLAY PANEL ACCESS MENU .................................................................................................................................................................................. 81
PARAMETER SETTING.................................................................................................................................................................................................. 82
21.0 VIEWABLE AND CHANGEABLE CONTROL PARAMETERS................................................................................................................................................ 85
GENERAL ...................................................................................................................................................................................................................... 85
DATA LOGGING............................................................................................................................................................................................................. 86
FUNCTIONS................................................................................................................................................................................................................... 86
DHW SETTINGS............................................................................................................................................................................................................. 87
ANTI-CYCLING............................................................................................................................................................................................................... 87
CONTROL MODES......................................................................................................................................................................................................... 88
BUILDING MANAGEMENT SYSTEM (BMS).................................................................................................................................................................... 89
CIRCULATION PUMPS .................................................................................................................................................................................................. 91
SERVICE NOTIFICATION............................................................................................................................................................................................... 91
BASIC SETUP ......................................................................................................................................................................................................... 92
22.0 ErP DATA TABLE ................................................................................................................................................................................................................. 93
23.0 USER INSTRUCTIONS.......................................................................................................................................................................................................... 94
GENERAL REQUIREMENTS .......................................................................................................................................................................................... 94
PROCEDURE FOR LIGHTING........................................................................................................................................................................................ 94
PROCEDURE FOR SHUTTING DOWN........................................................................................................................................................................... 94
SMART SYSTEM CONTROL .......................................................................................................................................................................................... 95
TEMPERATURE ADJUSTMENT PROCEDURE .............................................................................................................................................................. 95
MAINTENANCE.............................................................................................................................................................................................................. 96
AIR SUPPLY................................................................................................................................................................................................................... 96
SMART SYSTEM CONTROL .......................................................................................................................................................................................... 96
PARAMETER SETTINGS ............................................................................................................................................................................................... 96

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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 (EKW116CE EKW146CE & EKW176CE) LM900140A
Primary Circulating Pump (EKW206CE & EKW236CE) LM900149A
LST Direct Storage Vessel (From 297 litre to 2820 litre) See www.lochinvar.ltd.uk
Unvented/Boosted Water System Kits See www.lochinvar.ltd.uk
De-stratification Pump Kit WH9
Condensate Neutralisation Kit KIT2000
Flue System Components See Section 10.0
ModBus Interface Module LL100297842
BACnet Interface Module LL100297828

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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.
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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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 boiler if the flue gas temperature gets too hot. This protects the flue pipe from overheating.
7
Boiler outlet temperature sensor
This sensor monitors boiler outlet water temperature.
8
Boiler 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 boiler.
11
Burner
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 boiler.
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 boiler.
18
Mains voltage junction box
The junction box contains the connection points for the mains voltage power and all pumps.
19
Boiler 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 boiler 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 boiler.
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

9
3.1.2 PRINCIPLE PARTS SHOWN, TO BE USED WITH 3.1.1
REAR VIEW EKW116CE
LEFT SIDE VIEW EKW116CE
REAR VIEW EKW146CE
RIGHT SIDE VIEW EKW146CE

10
REAR VIEW EKW176CE-EKW236CE
SIDE VIEW EKW176CE-EKW236CE

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4.0 TECHNICAL DATA
Model Number
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
GENERAL DATA
Product I.D. Number
CE 0063CQ3351
Classification
II2H3B/P
Input (gross) –kW
kW
116.9
146.5
175.8
205.2
234.5
Input (net) –kW
kW
105.3
132
158.4
184.9
211.3
Output (PMMin-PNMax)
kW
22.1 - 110.6
28.2 - 141.2
32.4 - 162.1
37.5 - 187.4
45.4 - 227.2
Recovery Rate (44° ΔT) – l/hr
l/hr
2164
2768
3302
3865
4338
Recovery Rate (50° ΔT) – l/hr
l/hr
1904
2436
2905
3401
3819
Heat generator seasonal efficiency –%
%
93.2
96.7
95
95.1
95.3
Shipping Weight –kg
kg
129
138
154
168
184
NOX @0%o2 According to EU regulation 813/2013
mg/kw
40
38
37
34
32.5
NOX Class According to EU regulation EN15502
6
Maximum allowable temperature of the combustion air
°C
40
GAS DATA –G20
Nominal gas inlet pressure –mbar
mbar
20
Maximum gas inlet pressure –mbar
mbar
25
Minimum gas inlet pressure –mbar
mbar
17.5
Gas flow rate –m3/hr
m3/hr
11.1
14
16.8
19.6
22.3
Flue gas mass rate –g/sec (@ 10.5% CO2)
g/sec
42.5
53.2
63.9
74.6
85.2
Gas inlet connection size –“ BSP
“ BSP
1
3/4
1
1
1
GAS DATA –G31
Nominal gas inlet pressure –mbar
mbar
37
Maximum gas inlet pressure –mbar
mbar
45
Minimum gas inlet pressure –mbar
mbar
27
Gas flow rate –m3/hr
m3/hr
4.4
5.5
6.6
7.7
8.8
Flue gas mass rate –g/sec (@ 10.5% CO2)
g/sec
44.2
55.4
66.6
77.6
88.8
Gas inlet connection size –“ BSP
“ BSP
1
3/4
1
1
1
ELECTRICAL DATA
Power consumption -W
W
180
204
322
322
322
Power supply
Single phase 230v/50Hz
Protection class
IP00
WATER DATA
Water content –litres
litres
12.9
15.9
15.9
18.9
21.6
Water connections (F & R)
“ BSP
2
Max. water pressure (PMS) –bar
bar
11
Min. water pressure –bar
bar
0.5
Maximum water temperature –C
°C
80
Model Number
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
GENERAL DATA
Product I.D. Number
CE 0063CQ3351
Classification
II2H3B/P
Input (gross)
kW
116.9
146.5
175.8
205.2
244.2
Input (net)
kW
105.3
132
158.4
184.9
211.3
Output (PmMin-PnMax)
kW
22.1-110.6
28.2-141.2
32.4-162.1
37.5-187.4
45.4-227.2
Recovery Rate (44° ΔT)
l/hr
2164
2768
3302
3865
4338

12
Recovery Rate (50° ΔT)
l/hr
1904
2436
2905
3401
3819
Heat generator seasonal efficiency
%
94.6
96.4
92.2
91.3
93
Shipping Weight
kg
129
138
154
168
184
NOX @ 0% o2 According to EU regulation 812/2013
mg/kw
40
38
37
34
32.5
NOX Class According to EU regulation EN15502
6
Maximum allowable temperature of the combustion air
°C
40
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
11.1
14
16.8
19.6
22.3
Flue gas mass rate (@9.0% CO2)
g/sec
42.5
53.2
63.9
74.6
85.2
Gas inlet connection size
"BSP
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
4.4
5.5
6.6
7.7
8.8
Flue gas mass rate (@10.5% CO2)
g/sec
44.2
55.4
66.6
77.6
88.8
Gas inlet connection size
"BSP
1
1
1
1
1
ELECTRICAL DATA
Power consumption
W
180
204
322
322
322
Power supply
Single phase 230v/50Hz
Protection class
IP00
WATER DATA
Water content
litres
12.9
15.9
15.9
18.9
21.6
Water connections (F & R)
"BSP
2
Max. water pressure (PMS)
bar
11
Min. water pressure
bar
0.5
Maximum water temperature
°C
88
EcoKnight water heater_product data table_August 2019
Model Number
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
GENERAL DATA
Product I.D. Number
CE 0063CQ3351
Classification
II2H3B/P
Input (gross) –kW
kW
116.9
146.5
175.8
205.2
234.5
Input (net) –kW
kW
105.3
132
158.4
184.9
211.3
Output (PMMin-PNMax)
kW
22.1 - 110.6
28.2 - 141.2
32.4 - 162.1
37.5 - 187.4
45.4 - 227.2
Recovery Rate (44° ΔT) – l/hr
l/hr
2164
2768
3302
3865
4338
Recovery Rate (50° ΔT) – l/hr
l/hr
1904
2436
2905
3401
3819
Heat generator seasonal efficiency –%
%
93.2
96.7
95
95.1
95.3
Shipping Weight –kg
kg
129
138
154
168
184
NOX @0%o2 According to EU regulation 813/2013
mg/kw
40
38
37
34
32.5
NOX Class According to EU regulation EN15502
6
Maximum allowable temperature of the combustion air
°C
40
GAS DATA –G20
Nominal gas inlet pressure –mbar
mbar
20
Maximum gas inlet pressure –mbar
mbar
25
Minimum gas inlet pressure –mbar
mbar
17.5

13
Gas flow rate –m3/hr
m3/hr
11.1
14
16.8
19.6
22.3
Flue gas mass rate –g/sec (@ 10.5% CO2)
g/sec
42.5
53.2
63.9
74.6
85.2
Gas inlet connection size –“ BSP
“ BSP
1
3/4
1
1
1
GAS DATA –G31
Nominal gas inlet pressure –mbar
mbar
37
Maximum gas inlet pressure –mbar
mbar
45
Minimum gas inlet pressure –mbar
mbar
27
Gas flow rate –m3/hr
m3/hr
4.4
5.5
6.6
7.7
8.8
Flue gas mass rate –g/sec (@ 10.5% CO2)
g/sec
44.2
55.4
66.6
77.6
88.8
Gas inlet connection size –“ BSP
“ BSP
1
3/4
1
1
1
ELECTRICAL DATA
Power consumption -W
W
180
204
322
322
322
Power supply
Single phase 230v/50Hz
Protection class
IP00
WATER DATA
Water content –litres
litres
12.9
15.9
15.9
18.9
21.6
Water connections (F & R)
“ BSP
2
5.0 DIMENSIONS AND CLEARANCE
DIMENSIONAL DRAWINGS
Note full dimensional drawings showing connection sizes and positions are available from Lochinvar Technical Support
5.1.1 DIMENSIONAL DRAWING

14
Dimension
Unit
Model
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
A
mm
1080
1080
1080
1080
1080
B
mm
686
800
921
1022
1149
C
mm
824
916
1059
1153
1153
D
mm
394
394
394
394
394
5.1.2 DIMENSIONS TABLE

15
CLEARANCES
5.2.1 ENCLOSURE INSTALLATION CLEARANCES (MM)
5.2.2 PLANT-ROOM INSTALLATION CLEARANCES (MM)
400
400

16
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.
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 EN 806 1-5
Specifications for installations inside buildings conveying water for human consumption.
BS 7671 :2008 + A3:2015
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 3
Gas installation pipework, boosters and compressors on industrial and commercial premises.
IGE/UP/4 - Edition 4
Commissioning of gas-fired plant on industrial and commercial premises.
IGE/UP/10 - Edition 4
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.

17
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.
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
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 10.20.2 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 10.20.2 or to
BS5440-2 or BS6644 as appropriate.
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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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.
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.
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.
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.
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 18.0.LPG FUEL for information on
LPG pipework installation guidance.
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 15.5.2
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.
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.

19
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. Only C13,C33,C53 Flue systems are covered in any detail within this document, further information
can be found in the EcoKnight Flue assemblies and ancillaries guide available at www.lochinvar.ltd.uk See the relevant section for
details of each flue type and requirements.
FLUE SYSTEM GENERAL REQUIREMENTS
Install the horizontal flue components with an angle of 3° back in the direction of the boiler (roughly equal
to five centimetres for every linear meter). Failure to install the flue correctly will result in a build-up of
condense within the flue pipework that will cause early component failure.
When using a wall terminal, there is the possible risk of ice building-up on surrounding parts/structures,
because the condensate will freeze. This risk should be taken into account during the design phase of the
heating installation.
EcoKnight Water heaters will produce large condense clouds especially during cold weather, consideration
must be taken as to whether this will cause a nuisance to neighbouring properties and if so alternative flue
arrangements used.
EcoKnight Water heaters can operate with very low flue temperatures; as such the flue system used must
be suitable for use with condensing appliances made from either Polypropylene or stainless steel and have
a temperature class of T120.
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.
Before installation of any flue system read the installation manual carefully for both the appliance and flue
system to be used. Information on the flue system Supplied by Lochinvar can be found within this manual.

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FLUE SYSTEM TECHNICAL DETAILS AND MAXIMUM FLUE LENGTH
Model Number
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
FLUE DATA TYPE B23
Nominal flue diameter
mm
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
100/150
N/A see note below ‡
Minimum flue gas temp
°C
35
Average flue gas temp (80/60 Flow/Return)
°C
70
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
100
150
Minimum flue gas temp
°C
35
Average flue gas temp (80/60 Flow/Return)
°C
70
Maximum flue gas temp
°C
120
Nominal Flue gas mass rate (@ 10.5% CO2)
g/sec
42.5
53.2
63.9
74.6
85.2
Minimum Flue gas mass rate (@ 10.5% CO2)
g/sec
8.5
10.64
12.78
14.92
17
Maximum equivalent length
m
60*
Model Number
EKW116CE
EKW146CE
EKW176CE
EKW206CE
EKW236CE
FLUE DATA TYPE B23
Nominal flue diameter
mm
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
100/150
N/A see note below ‡
Minimum flue gas temp
°C
35
Average flue gas temp (80/60 Flow/Return)
°C
70
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
100
150