Lochinvar EKW85CE Guide

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The EcoKnight™ range
High Efficiency Gas Fired Condensing Water Heaters
Installation, Commissioning and Maintenance
Instructions
Models:
EKW45CE
EKW60CE
EKW85CE
EKW115CE
EKW145CE
EKW175CE
EKW205CE
EKW235CE
INS0011 Issue No 9 | October 2013

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Table of Contents
1.0 INTRODUCTION ................................................................................................................................................................................................... 4
2.0 PRINCIPAL PARTS............................................................................................................................................................................................... 5
3.0 TECHNICAL DATA................................................................................................................................................................................................ 9
4.0 GENERAL REQUIREMENTS ............................................................................................................................................................................. 11
4.1 RELATED DOCUMENTS ............................................................................................................................................................................. 11
5.0 WATER QUALITY ............................................................................................................................................................................................... 12
6.0 LOCATION........................................................................................................................................................................................................... 12
6.1 PLANT ROOM REQUIREMENTS ................................................................................................................................................................ 12
6.2 GENERAL REQUIREMENTS....................................................................................................................................................................... 12
6.3 CLEARANCES.............................................................................................................................................................................................. 13
6.4 CONDENSATE DRAIN................................................................................................................................................................................. 13
7.0 GAS SUPPLY ...................................................................................................................................................................................................... 13
7.1 SERVICE PIPES........................................................................................................................................................................................... 13
7.2 METERS ....................................................................................................................................................................................................... 13
7.3 GAS SUPPLY PIPES.................................................................................................................................................................................... 13
7.4 BOOSTED SUPPLIES.................................................................................................................................................................................. 13
7.5 PLANT-ROOM CONTROL VALVE............................................................................................................................................................... 13
7.6 EQUIPMENT GAS SYSTEM LEAK CHECK................................................................................................................................................ 14
8.0 FLUE SYSTEM.................................................................................................................................................................................................... 14
8.1 FLUE SYSTEM GENERAL REQUIREMENTS............................................................................................................................................. 15
8.2 APPROVED FLUE SYSTEM........................................................................................................................................................................ 15
8.3 INSTALLATION PRECAUTIONS ................................................................................................................................................................. 15
8.4 MAXIMUM LENGTH ..................................................................................................................................................................................... 15
8.5 FLUE DISCHARGE....................................................................................................................................................................................... 15
8.6 CONDENSATE DRAIN................................................................................................................................................................................. 15
8.7 WATER HEATER CONNECTION ASSEMBLY ........................................................................................................................................... 16
8.7.1 EKW45CE –EKW60CE......................................................................................................................................................................... 16
8.7.2 EKW85CE –EKW145CE....................................................................................................................................................................... 18
8.7.3 EKW175CE ............................................................................................................................................................................................ 19
8.7.4 EKW205CE –EKW235CE..................................................................................................................................................................... 20
8.8 FLUE TERMINAL INSTALLATION............................................................................................................................................................... 21
8.8.1 TYPE B23 ................................................................................................................................................................................................ 21
8.8.2 TYPE C13 ................................................................................................................................................................................................ 21
8.8.3 TYPE C33 ................................................................................................................................................................................................ 22
8.8.4 TYPE C43 ................................................................................................................................................................................................ 23
8.8.5 TYPE C53 ................................................................................................................................................................................................ 23
8.9 FLUE TERMINAL GUARDING ..................................................................................................................................................................... 23
9.0 AIR SUPPLY........................................................................................................................................................................................................ 24
9.1 COMBUSTION VENTILATION..................................................................................................................................................................... 24
9.2 COOLING VENTILATION............................................................................................................................................................................. 24
10.0 WATER CONNECTIONS .................................................................................................................................................................................... 25
10.1 GENERAL ..................................................................................................................................................................................................... 25
10.2 OPEN VENTED SYSTEM ARRANGEMENT ............................................................................................................................................... 25
10.3 UNVENTED SYSTEM ARRANGEMENT ..................................................................................................................................................... 25
10.3.1 EXPANSION VESSEL SIZING........................................................................................................................................................ 26
10.4 DE-STRATIFICATION .................................................................................................................................................................................. 26
10.5 CIRCULATING PUMPS................................................................................................................................................................................ 26
10.6 FLOW TEMPERATURE SENSOR............................................................................................................................................................... 27
10.6.1 DRY-POCKET SENSOR................................................................................................................................................................. 27
10.6.2 STRAP-ON SENSOR...................................................................................................................................................................... 27
10.6.3 SENSOR WIRING ........................................................................................................................................................................... 27
11.0 ELECTRICAL SUPPLY ....................................................................................................................................................................................... 28
11.1 EXTERNAL CONTROLS .............................................................................................................................................................................. 28
11.1.1 REMOTE ENABLING ...................................................................................................................................................................... 28
11.2 HIGH VOLTAGE CONNECTOR STRIP....................................................................................................................................................... 29
11.3 LOW VOLTAGE CONNECTOR STRIP........................................................................................................................................................ 29
11.4 ELECTRICAL CONNECTIONS .................................................................................................................................................................... 31
11.5 FUSES .......................................................................................................................................................................................................... 31
11.6 ARC WELDING PRECAUTIONS.................................................................................................................................................................. 31
11.7 WIRING DIAGRAM....................................................................................................................................................................................... 32
11.8 LADDER DIAGRAM...................................................................................................................................................................................... 33
12.0 SMART SYSTEM CONTROL.............................................................................................................................................................................. 34
12.1 GENERAL ..................................................................................................................................................................................................... 34
12.2 SMART SYSTEM CONTROL PANEL .......................................................................................................................................................... 34
12.3 SEQUENCE OF OPERATION...................................................................................................................................................................... 35
12.4 STATUS DISPLAY SCREENS ..................................................................................................................................................................... 36
13.0 COMMISSIONING AND TESTING ..................................................................................................................................................................... 38
13.1 ELECTRICAL INSTALLATION ..................................................................................................................................................................... 38
13.2 GAS INSTALLATION.................................................................................................................................................................................... 38
13.3 WATER CONNECTIONS.............................................................................................................................................................................. 38
13.4 COMMISSIONING THE EQUIPMENT ......................................................................................................................................................... 38
13.4.1 GENERAL CHECKS PRIOR TO LIGHTING................................................................................................................................... 38
13.4.2 EQUIPMENT CHECKS PRIOR TO LIGHTING............................................................................................................................... 38
13.4.3 PROCEDURE FOR INITIAL LIGHTING.......................................................................................................................................... 39
13.4.4 GAS PRESSURE ADJUSTMENT AND COMBUSTION CHECKS ................................................................................................ 39

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13.5 TEMPERATURE ADJUSTMENT PROCEDURE ......................................................................................................................................... 39
13.6 INSTALLATION NOISE ................................................................................................................................................................................ 40
14.0 LPG FUEL............................................................................................................................................................................................................ 40
14.1 RELATED DOCUMENTS ............................................................................................................................................................................. 40
14.2 CONVERSION TO LPG................................................................................................................................................................................ 40
14.2.1 EKW45CE –EKW85CE .................................................................................................................................................................. 41
14.2.2 EKW115CE...................................................................................................................................................................................... 42
14.2.3 EKW145CE (BEFORE SERIAL NUMBER L09H10120786)........................................................................................................... 43
14.2.4 EKW145CE (FROM SERIAL NUMBER L09H10120786)............................................................................................................... 44
14.2.5 EKW175CE –EKW235CE .............................................................................................................................................................. 45
14.3 LPG COMMISSIONING AND TESTING ...................................................................................................................................................... 46
14.3.1 LPG PRESSURE ADJUSTMENT AND COMBUSTION CHECKS................................................................................................. 46
15.0 MAINTENANCE................................................................................................................................................................................................... 46
15.1 GENERAL ..................................................................................................................................................................................................... 46
15.2 MAINTENANCE SCHEDULE ....................................................................................................................................................................... 46
15.3 BURNER INSPECTION................................................................................................................................................................................ 47
15.4 BURNER REMOVAL .................................................................................................................................................................................... 47
15.5 CLEANING THE HEAT EXCHANGER......................................................................................................................................................... 47
15.6 DRAINING WATER HEATER SYSTEM....................................................................................................................................................... 48
15.7 REMOVING SCALE AND SEDIMENT FROM THE STORAGE VESSEL ................................................................................................... 48
15.8 SACRIFICIAL ANODES: INSPECTION AND REPLACEMENT (STORAGE VESSELS)............................................................................ 48
15.9 REFILLING THE SYSTEM ........................................................................................................................................................................... 48
15.10 OTHER CHECKS................................................................................................................................................................................... 49
15.10.1 RELIEF VALVE................................................................................................................................................................................ 49
15.10.2 FLUE SYSTEM................................................................................................................................................................................ 49
15.10.3 CONDENSATE NEUTRALISATION KIT......................................................................................................................................... 49
16.0 SMART SYSTEM CONTROL SETTINGS .......................................................................................................................................................... 49
16.1 ENTERING THE INSTALLER CODE........................................................................................................................................................... 49
16.2 MENU SET D FUNCTIONS.......................................................................................................................................................................... 50
16.2.1 RESET LAST 10 ERRORS ............................................................................................................................................................. 50
16.2.2 SERVICE MODE DELAY ................................................................................................................................................................ 50
16.3 MENU SET E WHR SETTINGS ................................................................................................................................................................... 50
16.3.1 TANK SETPOINT ............................................................................................................................................................................ 50
16.4 MENU SET H CONTROL MODES............................................................................................................................................................... 50
16.4.1 CONTROL SOURCE....................................................................................................................................................................... 50
16.4.2 CASCADE ADDRESS..................................................................................................................................................................... 50
16.4.3 MAX CASCADE SETPOINT............................................................................................................................................................ 51
16.4.4 CASCADE OFFSET ........................................................................................................................................................................ 51
16.4.5 CASCADE OFF-ON DIFFERENTIAL.............................................................................................................................................. 51
16.5 MENU SET I CIRCULATION PUMPS .......................................................................................................................................................... 51
16.5.1 DHW PUMP DELAY ........................................................................................................................................................................ 51
16.6 MENU SET J SERVICE NOTIFICATION ..................................................................................................................................................... 51
16.6.1 SERVICE NOTIFICATION IN MONTHS ......................................................................................................................................... 51
16.6.2 SERVICE NOTIFICATION RUNNING HOURS .............................................................................................................................. 51
16.6.3 SERVICE NOTIFICATION BOILER CYCLES................................................................................................................................. 51
16.6.4 RESET SERVICE NOTIFICATION COUNTER .............................................................................................................................. 51
17.0 USER INSTRUCTIONS....................................................................................................................................................................................... 51

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1.0 INTRODUCTION
The Lochinvar EcoKnight™range is a floor standing direct gas fired condensing water heater. The
equipment comprises of stainless steel radial burner assembly and heat exchanger that permits fully
condensing operation. EcoKnight™ water heaters should be used in conjunction with an appropriately sized
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, glanded construction pump
is utilised to maintain a constant water flow rate through the heat exchanger.
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 14: 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 (EKW45CE & EKW60CE) Omega 3-80-2ZS
Primary Circulating Pump (EKW85CE) Omega 4-90-2ZS
Primary Circulating Pump (EKW115CE EKW145CE & EKW175CE) Omega 4-100-2ZS
Primary Circulating Pump (EKW205CE & EKW235CE) Omega 5-110-2ZS
Direct Storage Cylinder (297 litre) LST66
Direct Storage Cylinder (450 litre) LST100
Direct Storage Cylinder (747 litre) LST166
Direct Storage Cylinder (1155 litre) LST250
Unvented/Boosted Water System Kits Contact Lochinvar Limited
De-stratification Pump Kit WH9
Condensate Neutralisation Kit KIT2000
Pre-Fabricated Interconnecting Pipework Contact Lochinvar Limited
Flue System Components Contact Lochinvar Limited

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2.0 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 (heater return). If selected as the controlling
sensor, the control module adjusts the water heater firing rate so the inlet temperature is correct.
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 direct storage vessel, either 1-1/4" or 2",
depending on the model.
13
Water inlet
BSP water connection that returns water from the direct storage vessel 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
Automatic air vent
Designed to remove trapped air from the heat exchanger coils.
17
Air intake adapter
Allows for the connection of the PVC 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
TABLE 1.1 THE ECOKNIGHT WATER HEATER - HOW IT WORKS...

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FRONT VIEW
MODELS EKW45CE –EKW60CE
LEFT SIDE (INSIDE UNIT)
MODELS EKW45CE –EKW60CE
REAR VIEW
MODELS EKW45CE –EKW60CE
RIGHT SIDE (INSIDE UNIT)
MODELS EKW45CE –EKW60CE

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REAR VIEW
MODEL EKW85CE –EKW115CE
REAR VIEW
MODEL EKW145CE
LEFT SIDE (INSIDE UNIT)
MODEL EKW85CE –EKW115CE
LEFT SIDE (INSIDE UNIT)
MODEL EKW145CE

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REAR VIEW
MODEL EKW175CE –EKW235CE
LEFT SIDE (INSIDE UNIT)
MODEL EKW175CE –EKW235CE

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3.0 TECHNICAL DATA
Model Number
EKW45CE
EKW60CE
EKW85CE
EKW115CE
EKW145CE
EKW175CE
EKW205CE
EKW235CE
GENERAL DATA
Input (gross) –kW
44.0
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
132.0
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 –%
93.8
95.9
96.1
94.7
97.8
96.1
96.4
94.7
Shipping Weight –kg
75
79
102
129
138
154
168
184
NOXClass
5
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
8.0
11.1
14.0
16.8
19.6
22.3
Flue gas mass rate –g/sec
(@ 9.0% CO2)
16.0
22.3
30.4
42.5
53.2
63.9
74.6
85.2
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
(@ 10.5% CO2)
16.7
23.2
31.6
44.2
55.4
66.6
77.6
88.8
Gas inlet connection size –“ BSP
½
½
¾
1
1
1
1
1
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
11.0
Min. water pressure –bar
0.5
Test pressure –bar
16.5
Maximum water temperature –C
80
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
150/220
Maximum flue gas temp. –C
120
Maximum equivalent length –m
30
13
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
(80/60 Flow/Return)
70
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
TABLE 3.1 TECHNICAL DATA
‡EKW175CE, EKW205 and EKW235CE use a concentric terminal only. The remainder of the flue system is to
be constructed from 150mm single wall components.
* On twin pipe systems, the maximum equivalent length is the sum the air inlet components and the exhaust
components.

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FIGURE 3.1 ENCLOSURE INSTALLATION CLEARANCES (mm)
FIGURE 3.2 PLANT-ROOM INSTALLATION CLEARANCES (mm)
400
400

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4.0 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.
PLEASE read the instructions fully before installing or using the appliance.
4.1 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:
BS EN 1858: 2003 Chimneys. Components. Concrete flue blocks
BS 5440-1: 2008 Installation and maintenance of flues and ventilation for gas appliances of rated input
not exceeding 70kW net (1st, 2nd and 3rd family gases)
Part 1: Specification for installation and maintenance of flues
BS 5440-2: 2009 Installation and maintenance of flues and ventilation for gas appliances of rated input
not exceeding 70kW net (1st, 2nd and 3rd family gases)
Part 2: Specification for installation and maintenance of ventilation for gas appliances
BS 6644: 2005 Specification for Installation of gas fired hot water boilers of rated inputs between 70kW
+ A1: 2008 (net) and 1.8MW (net) (2nd and 3rd family gasses)
BS 6700: 1997 Design, installation, testing and maintenance of services supplying water for domestic
use within buildings and their curtilages
BS 6880: 1988 Code of practice for low temperature hot water systems of output greater than 45kW
Parts 1, 2 and 3
BS 7074: 1989 Application, selection and installation of expansion vessels and ancillary equipment for
Parts 1and 2 sealed systems
BS 7671: 2008 Requirements for electrical installations, I.E.E. wiring regulations seventeenth edition
CP 342: Code of practice for centralised hot water supply-buildings other than dwellings
Part 2 1974
IGE/UP/1: Installation pipework on industrial and commercial premises
Edition 2
IGE/UP/2: Gas installation pipework, boosters and compressors on industrial and commercial
Edition 2 premises
IGE/UP/4: Commissioning of gas fired plant on industrial and commercial premises
Edition 2
IGE/UP/10: Installation of flued gas appliances in industrial and commercial premises
Edition 3
Gas Safety (Installation and Use) Regulations 1998 (England, Scotland & Wales)

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CIBSE: Guide parts A, B and C
H.S.E. guidance Automatically controlled steam and hot water boilers
note PM5:
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.
5.0 WATER QUALITY
Water supply quality may adversely affect the efficiency and performance of water heaters and hot water systems.
The situation can intensify where higher temperatures or demands exist.
Water hardness should not exceed 205ppm CaCO3 and TDS (Total Dissolved Solids) of untreated water should not
exceed 350ppm. If these values are exceeded, contact Lochinvar Limited for further guidance.
6.0 LOCATION
6.1 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 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 Figure 3.2 are observed. If the appliance is to be installed in a compartment or a hot
environment, the minimum clearances detailed in Figure 3.1 should be observed. In addition to this, ventilation for
cooling purposes must be fitted. For further guidance, please refer to Section 9: AIR SUPPLY or to BS5440-2 or
BS6644 as appropriate.
The Lochinvar EcoKnight™ can also be used as a type B23 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 9:
AIR SUPPLY or to BS5440-2 or BS6644 as appropriate.
6.2 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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6.3 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 Figure 3.1 & Figure 3.2 for dimensions/clearances. Further details regarding locations are given in BS5440 or
BS6644 as appropriate.
6.4 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.
7.0 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 14: LPG FUEL.
7.1 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.
7.2 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.
7.3 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 14:
LPG FUEL for information on LPG pipework installation guidance.
7.4 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 11: ELECTRICAL SUPPLY
7.5 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.

14
7.6 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.
8.0 FLUE SYSTEM
FIGURE 8.1: FLUE TERMINAL POSITIONS
Location
Description
EKW45CE –EKW60CE
EKW85CE –EKW235CE
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
TABLE 8.1 FLUE TERMINAL MINIMUM DISTANCES

15
8.1 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.
8.2 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 appliance, the approved, purpose designed adaptive flue system should be used. For further
details, please contact Lochinvar Limited.
When used as a Type B 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.
8.3 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 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.
8.4 MAXIMUM LENGTH
Details of maximum flue lengths can be found in Table 3.1
8.5 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.
Under certain operating and weather conditions, the EcoKnight™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 Figure 8.1 and Table 8.1.
8.6 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.

16
8.7 WATER HEATER CONNECTION ASSEMBLY
8.7.1 EKW45CE –EKW60CE
FIGURE 8.2 FLUE CONNECTION DETAILS EKW45CE –EKW60CE
ITEM
DESCRIPTION
1
Flue Gas Test Point
2
Concentric Adaptor
3
80mm Dia x 500mm Length
4
90Elbow
5
Air Intake Transition
6
Intake Connection Reducer
7
Exhaust Transition
TABLE 8.2 FLUE CONNECTION DETAILS EKW45CE –EKW60CE

17
FIGURE 8.3 CUTTING ITEM 5 TO LENGTH
To install the flue connection to the EKW45CE –EKW60CE water heaters the following procedure should be
followed:
1. Insert the exhaust transition (Item 7 in Figure 8.2) into the exhaust port on the heater.
2. Insert the flue temperature sensor (supplied with the water heater) into the location hole on the exhaust
transition.
NOTE: IF THE FLUE TEMPERATURE SENSOR IS NOT FITTED, THE FLUE GAS MAY EXCEED THE
MAXIMUM TEMPERATURE RATING OF THE FLUE AND CAN LEAD TO SEVERE PERSONAL INJURY, DEATH
OR SUBSTANTIAL PROPERTY DAMAGE.
3. Insert the air intake transition (Item 5 in Figure 8.2) into the intake connection reducer (Item 6) and tighten
the worm drive clip.
4. To the bottom (exhaust) connection of the concentric adaptor (Item 2 in Figure 8.2) fit the 80mm dia. x
500mm length then fit one 90° elbow to the 500mm length.
5. To the side (intake) connection of the concentric adaptor, fit the remaining 90elbows.
6. Fit the exhaust section of the assembly to the heater, ensuring the concentric adaptor is vertical, and
measure the distance between the centre of the air intake transition and the 90elbow. (See Figure 8.3)
7. Remove the 80mm dia. x 500mm length and cut the measured distance from the plain end. (See Figure
8.3)
8. Reassemble and fit to the heater.
9. Fit the flue gas test point (Item 1 in Figure 8.2) and clamp using its locking band.
"X"
"X"

18
8.7.2 EKW85CE –EKW145CE
FIGURE 8.4 FLUE CONNECTION DETAILS EKW85CE –EKW145CE
ITEM
DESCRIPTION
1
Flue Gas Test Point
2
Concentric Adaptor
3
100mm Dia x 500mm Length
4
90Elbow
5
Exhaust Transition
6
Intake Connection
7
Air Intake Transition
TABLE 8.3 FLUE CONNECTION DETAILS EKW85CE –EKW145CE
FIGURE 8.5 CUTTING ITEM 3 (1) TO LENGTH
"X"
"X"

19
To install the flue connection to the EKW85CE –EKW145CE water heaters the following procedure should be
followed:
1. Insert the exhaust transition (Item 6 in Figure 8.4) into the exhaust port on the heater.
2. Insert the flue temperature sensor (supplied with the water heater) into the location hole on the exhaust
transition.
NOTE: IF THE FLUE TEMPERATURE SENSOR IS NOT FITTED, THE FLUE GAS MAY EXCEED THE
MAXIMUM TEMPERATURE RATING OF THE FLUE AND CAN LEAD TO SEVERE PERSONAL INJURY, DEATH
OR SUBSTANTIAL PROPERTY DAMAGE.
3. To the bottom (exhaust) connection of the concentric adaptor (Item 2 in Figure 8.4) fit one of the 100mm
dia. x 500 lengths (Item 3) followed by one of the 90elbows (Item 4).
4. Offer the assembly to the heater, ensuring the concentric adaptor is vertical, and measure the distance
between the centre of the air intake connection and the concentric adaptor. (See Figure 8.5)
5. Remove the 100mm dia. x 500mm length and cut the measured distance from the plain end. (See Figure
8.5)
6. Insert the air intake transition (Item 7 in Figure 8.4) into the intake connection (Item 6) and tighten the worm
drive clip.
7. To the side (intake) connection of the concentric adaptor, fit one of the 100mm dia. x 500mm length
followed by one of the 90elbows.
8. To the air intake transition, fit the final 90elbow followed by the final 100mm dia. x 500mm length.
Measure and cut the 100mm dia. x 500mm lengths to suit the installation.
9. Reassemble and fit to the heater.
10. Fit the flue gas test point (Item 1 in Figure 8.4) and clamp using its locking band.
8.7.3 EKW175CE
FIGURE 8.6 FLUE CONNECTION DETAILS EKW175CE
ITEM
DESCRIPTION
1
Intake Connection
2
Air Intake Transition
3
130mm to 150mm Expander
4
100mm to 130mm Expander
5
90Elbow
6
Exhaust Transition
TABLE 8.4 FLUE CONNECTION DETAILS EKW175CE
6
3
21
4
5

20
To install the flue connection to the EKW175CE water heater the following procedure should be followed:
1. Insert the exhaust transition (Item 6 in Figure 8.6) into the exhaust port on the heater.
2. Insert the flue temperature sensor (supplied with the water heater) into the location hole on the exhaust
transition.
NOTE: IF THE FLUE TEMPERATURE SENSOR IS NOT FITTED, THE FLUE GAS MAY EXCEED THE
MAXIMUM TEMPERATURE RATING OF THE FLUE AND CAN LEAD TO SEVERE PERSONAL INJURY, DEATH
OR SUBSTANTIAL PROPERTY DAMAGE.
3. Insert the 90° elbow (Item 5 in Figure 8.6) in to the exhaust transition ensuring the socket is pointing
upwards.
4. Insert the 100mm to 130mm expander (Item 4 in Figure 8.6) in to the 90° elbow.
5. Insert the 130mm to 150mm expander (Item 3 in Figure 8.6) in to the 100mm to 130mm expander.
6. Insert the air intake transition (Item 2 in Figure 8.6) into the intake connection (Item 1) and tighten the worm
drive clip.
8.7.4 EKW205CE –EKW235CE
FIGURE 8.7 FLUE CONNECTION DETAILS EKW205CE –EKW235CE
ITEM
DESCRIPTION
1
Intake Connection
2
Air Intake Transition
3
Exhaust Transition
4
Flue Collar
TABLE 8.5 FLUE CONNECTION DETAILS EKW205CE –EKW235CE
To install the flue connection to the EKW205CE –EKW235CE water heaters the following procedure should be
followed:
1. Ensure that the flue collar (Item 4 in Figure 8.7) is correctly located in the appliance and that the flue
temperature sensor (supplied with the water heater) is located in the grommet in the collar.
NOTE: IF THE FLUE TEMPERATURE SENSOR IS NOT FITTED, THE FLUE GAS MAY EXCEED THE
MAXIMUM TEMPERATURE RATING OF THE FLUE AND CAN LEAD TO SEVERE PERSONAL INJURY, DEATH
OR SUBSTANTIAL PROPERTY DAMAGE.
2. Insert the air intake transition (Item 2 in Figure 8.7) into the intake connection (Item 1) and tighten the worm
drive clip.
3. Insert the exhaust transition (Item 3 in Figure 8.7) into the flue collar (Item 4) and secure with the worm
drive clip.
2 3 41