Lochinvar EFW 85 Guide

EFW
Wall mounted gas fired condensing water
heater.
Installation, Commissioning, User and
Maintenance instructions
MODELS:
EFW 85
EFW 105
EFW 125
EFW 155

Document Control
Article
Language
Version
Date
Modified by
EcoForce Installation Instructions
English
V1
12-Oct-23
S Hunt

E93.1804.014
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TABLE OF CONTENTS
1INTRODUCTION.......................................................................................................................... 7
REGULATIONS .................................................................................................................... 7
2SAFETY GUIDELINES ................................................................................................................... 8
GENERAL DESCRIPTION OF SAFETY SYMBOLS USED........................................................................ 9
WHAT TO DO IF YOU SMELL GAS:............................................................................................ 10
IMPORTANT TECHNICAL WARNINGS AND GUIDELINES .................................................................... 10
3Water quality (also see § 8.1).................................................................................................... 10
WATER FLOW VELOCITY AND PUMP SELECTION ........................................................................... 11
SAFETY VALVE................................................................................................................... 12
4TECHNICAL DATA EFW WATER HEATERS ................................................................................... 13
FUNCTIONAL INTRODUCTION................................................................................................. 13
LOCATION OF VERSION NUMBERS ........................................................................................... 13
TECHNICAL SPECIFICATIONS DATASHEET.................................................................................... 14
TABLE TECHNICAL SPECIFICATIONS ERP .................................................................................... 15
5DIMENSIONS & CONNECTIONS ................................................................................................. 16
EFW 85 &EFW 105 ........................................................................................................ 16
EFW 125....................................................................................................................... 17
EFW 155....................................................................................................................... 18
EFW 85 –125 FLUE SPIGOT DIMENSIONS ............................................................................... 19
5.4.1 100 / 150 MM Coaxial flue spigot ...................................................................... 19
5.4.2 2 X 100 MM Twin flue spigots ........................................................................... 19
EFW 155 FLUE SPIGOT DIMENSIONS...................................................................................... 20
5.5.1 2 X 150 MM Twin flue spigots ........................................................................... 20
CASCADE FRAMES.............................................................................................................. 21
5.6.1 Cascade frame dimensions................................................................................ 22
6ACCESSORIES AND UNPACKING ................................................................................................ 23
ACCESSORIES ................................................................................................................... 23
UNPACKING..................................................................................................................... 23
7INSTALLATION LOCATION OF THE EFW...................................................................................... 24
INSTALLATION CLEARANCES .................................................................................................. 24
WATER HEATER INSTALLATION LOCATION REQUIREMENTS:............................................................ 25
MOUNTING THE WATER HEATER............................................................................................. 25
8CONNECTIONS ......................................................................................................................... 27
TANK POSITIONING ............................................................................................................ 27
WATER HEATER CONNECTIONS .............................................................................................. 27
CONDENSATE DRAIN CONNECTION .......................................................................................... 27
NON-RETURN VALVE .......................................................................................................... 28
PUMP FUNCTIONALITY ........................................................................................................ 28
FROST PROTECTION............................................................................................................ 28
WATER QUALITY ............................................................................................................... 29
FLUSH THE SYSTEM WITH FRESH WATER.................................................................................... 29
DE-AIR SEQUENCE............................................................................................................. 29
WATER PRESSURE.............................................................................................................. 30
9THE EFW SANITAIRY SYSTEM: INSTALLATION INSTRUCTIONS ..................................................... 31
STAND-ALONE SET-UP......................................................................................................... 31
STAND-ALONE CONFIGURATION ............................................................................................. 32
CASCADE SET-UP ............................................................................................................... 33
9.3.1 Cascade calculations ........................................................................................ 34
10 HEAT EXCHANGER RESISTANCE GRAPHS ................................................................................... 37
RESISTANCE GRAPH EFW 85 ................................................................................................ 37
RESISTANCE GRAPH EFW 105 .............................................................................................. 37
RESISTANCE GRAPH EFW 125 .............................................................................................. 38
RESISTANCE GRAPH EFW 155 .............................................................................................. 38

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MINIMUM REQUIRED PUMP HEAD.......................................................................................... 39
PUMP:MAXIMUM ELECTRIC POWER ........................................................................................ 39
11 FLUE GAS AND AIR SUPPLY SYSTEM .......................................................................................... 40
GENERAL ........................................................................................................................ 40
POLYPROPYLENE ............................................................................................................... 41
11.2.1 Flexible polypropylene ...................................................................................... 41
STAINLESS STEEL VENT......................................................................................................... 42
AIR SUPPLY...................................................................................................................... 42
11.4.1 Combustion air quality...................................................................................... 42
11.4.2 Air supply through humid areas......................................................................... 42
11.4.3 Air inlet pipe materials...................................................................................... 42
ROOM AIR....................................................................................................................... 42
11.5.1 Air contamination ............................................................................................ 43
CORROSIVE CONTAMINANTS AND SOURCES............................................................................... 43
FLUE TERMINAL LOCATIONS........................................................................................... 44
WATER HEATER CATEGORIES -TYPES OF FLUE GAS SYSTEMS............................................................ 45
C63 CERTIFIED.................................................................................................................. 52
PIPE HEIGHTS AND MUTUAL DISTANCES ON A FLAT ROOF................................................................ 52
FLUE GAS AND AIR SUPPLY RESISTANCE TABLE ............................................................................. 53
TYPICAL EXAMPLES....................................................................................................... 54
11.12.1 Example A: Twin pipe system with separate pipes for flue outlet and air supply .... 54
11.12.2 Example B: Twin pipe system with concentric roof terminal ................................. 55
11.12.3 Example C: Single flue gas outlet. Air supply from water heater room................... 57
11.12.4 Example D: Concentric flue gas/air supply pipe (roof-mounted)............................ 58
11.12.5 Example E: Concentric system Wall outlet C13 (wall-mounted) ............................ 58
11.12.6 Example F: Separate air supply duct & flue duct in different pressure zone (C53) ... 60
12 COMMON FLUE CASCADING ..................................................................................................... 61
SAFETY MEASURES COMMON FLUE SYSTEMS ............................................................................. 61
EXISTING COMMON VENTING GUIDELINES ................................................................................. 63
13 ELECTRICAL INSTALLATION ....................................................................................................... 64
GENERAL ........................................................................................................................ 64
CONNECTION MAINS SUPPLY ................................................................................................. 64
ELECTRICAL CONNECTIONS ................................................................................................... 64
EXPLANATION OF THE LOW VOLTAGE CONNECTIONS..................................................................... 66
EXPLANATION OF THE MAINS VOLTAGE CONNECTIONS................................................................... 67
ELECTRICAL SCHEMATICS...................................................................................................... 68
LADDER /LOGIC DIAGRAM ................................................................................................... 70
SENSOR AVAILABILITY.......................................................................................................... 71
NTC SENSOR CURVE........................................................................................................... 71
PROGRAMMABLE IN-AND OUTPUTS ........................................................................................ 71
14 DISPLAY AND BUTTONS............................................................................................................ 73
DISPLAY AND BUTTONS........................................................................................................ 73
73
DISPLAY CONFIGURATION..................................................................................................... 74
STARTING THE WATER HEATER ............................................................................................... 75
14.3.1 Set Actual setpoint/DHW setpoint directly via the Status overview ....................... 75
14.3.2 Set Actual setpoint/DHW setpoint by the menu .................................................. 75
14.3.3 Protected menu items....................................................................................... 76
14.3.4 De-aeration Sequence....................................................................................... 76
14.3.5 Language settings ............................................................................................ 76
14.3.6 Change language via the menu ......................................................................... 77
14.3.7 Change the language via the menu Icons ........................................................... 77
WATER HEATER HISTORY...................................................................................................... 77
ERROR LOGGING............................................................................................................... 78
SERVICE REMINDER ............................................................................................................ 79
14.6.1 Service overdue logging .................................................................................... 79
14.6.2 Reset the service reminder ................................................................................ 79

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14.6.3 Menu’s and parameters.................................................................................... 79
GENERAL ........................................................................................................................ 80
14.7.1 Pump start every 24 hours................................................................................ 80
14.7.2 Frost protection ............................................................................................... 80
IGNITION CYCLE................................................................................................................. 80
14.8.1 Control functions.............................................................................................. 82
14.8.2 On board HMI and LED colors............................................................................ 83
14.8.3 Flame detection ............................................................................................... 83
14.8.4 Flame recovery................................................................................................. 83
DEMAND FOR DOMESTIC HOT WATER ..................................................................................... 84
14.9.1 DHW Storage with bulb and strap-on sensor; DHW mode 1 ................................. 84
14.9.2 Anti-legionella protection.................................................................................. 85
DISPLAY MENU STRUCTURE SUMMARY..................................................................................... 87
15 TEMPERATURE PROTECTION .................................................................................................... 95
16 ERROR INFORMATION.............................................................................................................. 95
WATER HEATER HISTORY...................................................................................................... 95
LOCKOUT CODES ............................................................................................................... 96
BLOCKING CODES .............................................................................................................. 98
WARNINGS.................................................................................................................... 100
17 CASCADING ........................................................................................................................... 101
SYSTEM SETUP ............................................................................................................... 101
QUICK-GUIDE CASCADE SET-UP............................................................................................ 102
WATER HEATER CASCADE COMMUNICATION SETUP.................................................................... 103
17.3.1 Setting the water heater address..................................................................... 103
17.3.2 Setting of the cascade parameters................................................................... 104
17.3.3 Cascade –Managing water heater .................................................................. 104
17.3.4 Cascade –Depending Water heater ................................................................. 105
17.3.5 Cascade –Power balance mode....................................................................... 105
CASCADE –WATER HEATER ROTATION................................................................................... 105
17.4.1 Next module to start selection......................................................................... 106
CASCADE ERROR HANDLING ............................................................................................... 106
17.5.1 Cascade Frost protection................................................................................. 106
17.5.2 Emergency mode............................................................................................ 106
17.5.3 Loss of cascade communication....................................................................... 107
17.5.4 Managing water heater error.......................................................................... 107
18 SYSTEM TEST. ........................................................................................................................ 107
19 COMMISSIONING THE WATER HEATER.................................................................................... 108
FIRST:FLUSHING THE WATER HEATER WITH WATER .................................................................... 108
SECOND:FILLING &VENTING THE WATER HEATER AND THE SYSTEM................................................. 108
THIRD:CHECK THE WATER FLOW .......................................................................................... 108
MOUNTING CONDENSATE TRAP........................................................................................... 108
CHECKING GAS PRESSURE................................................................................................... 109
FIRING FOR THE FIRST TIME................................................................................................. 109
20 ADJUSTING AND SETTING THE WATER HEATER........................................................................ 110
INTRODUCTION............................................................................................................... 110
20.1.1 Combustion table ........................................................................................... 110
20.1.2 Setting screws venturi- and gas valves: drawings .............................................. 111
ADJUSTMENT PROCEDURES................................................................................................. 112
VENTURI REPLACEMENT ADJUSTMENT ................................................................................... 113
CONVERSION FROM NATURAL GAS TO PROPANE........................................................................ 113
START UP CHECKLIST ........................................................................................................ 116
117
21 INSPECTION, MAINTENANCE AND SERVICE.............................................................................. 119
GENERAL ...................................................................................................................... 119
INSPECTION,MAINTENANCE AND SERVICE............................................................................... 119
21.2.1 Decalcifying of the Heat exchanger.................................................................. 125

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21.2.2 Mounting the burner door............................................................................... 126
INSTRUCTIONS FOR THE USER.................................................................................................. 3
RECYCLING ........................................................................................................................ 3
22 MAINTENANCE CHECKLIST.......................................................................................................... 4
23 Spare parts ............................................................................................................................. 5
24 USER’S PART .............................................................................................................................. 6
ABBREVIATIONS.................................................................................................................. 6
SAFETY GUIDELINES.............................................................................................................. 6
TO TURN OFF GAS TO THE APPLIANCE......................................................................................... 7
MAINTENANCE AND INSPECTION .............................................................................................. 7
DISPLAY AND BUTTONS.......................................................................................................... 8
24.5.1 Explanation of the buttons.................................................................................. 8
24.5.2 Display configuration.......................................................................................... 9
STARTING THE WATER HEATER............................................................................................... 10
24.6.1 Entering the menu............................................................................................ 10
CHANGING THE SETPOINT DHW............................................................................................ 11
24.7.1 Set Actual setpoint/DHW setpoint directly via the Status overview ....................... 11
24.7.2 Changing the DHW setpoint directly. ................................................................. 11
PASSWORD...................................................................................................................... 11
AVAILABLE MENU ITEMS...................................................................................................... 12
24.9.1 Central Heating (CH), Do not use or change these settings .................................. 12
24.9.2 Domestic Hot Water (DHW) .............................................................................. 12
24.9.3 Information ..................................................................................................... 12
24.9.4 Software Versions ............................................................................................ 12
24.9.5 Water heater Status ......................................................................................... 12
24.9.6 Water heater History........................................................................................ 13
24.9.7 Error log .......................................................................................................... 13
24.9.8 Service............................................................................................................. 13
24.9.9 Settings ........................................................................................................... 13
24.9.10 General Settings............................................................................................... 13
24.9.11 Language ........................................................................................................ 13
24.9.12 Unit Type......................................................................................................... 13
24.9.13 Date & Time..................................................................................................... 13
24.9.14 Time zone settings............................................................................................ 14
24.9.15 Display settings................................................................................................ 14
24.9.16 Cascade mode.................................................................................................. 14
24.9.17 Other Settings.................................................................................................. 14
24.9.18 Boiler settings .................................................................................................. 14
WATER HEATER HISTORY ..................................................................................................... 14
ERROR LOGGING ............................................................................................................... 15
SERVICE REMINDER ............................................................................................................ 15
25 Appendix............................................................................................................................... 16
WARRANTY TERMS AND CONDITIONS.............................................................................. 16

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1INTRODUCTION
This manual has been written for:
•The installer
•System design engineers
•Service engineers
•End User
READ AND UNDERSTAND THE INSTRUCTIONS
Read and fully understand all instructions before attempting to operate maintain or install the unit.
Regulations
It is the law in the UK that a competent person registered with the HSE approved body and in accordance with
the Gas Safety regulations installs all Gas appliances.
Failure to install the appliance correctly could lead to prosecution. It is in your own interest and that of safety to
ensure the appliance is installed correctly.
The installation of the water heater 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 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 Water heaters of rated inputs between 70 kW (net)
and 1.8 MW (net) (2nd and 3rd family gases).
BS 6700: 2006 +A1: 2009
Design, installation, testing and maintenance of services supplying water for domestic use within
buildings and their curtilages.
BS 6880: 1988 Parts 1, 2 and 3
Code of practice for low temperature hot water systems of output greater than 45 kW.
BS 7074: 1989 Parts 1 and 2
Application, selection and installation of expansion vessels and ancillary equipment for sealed systems.
BS 7671: 2008 + A3: 2015
Requirements for electrical installations, I.E.E. wiring regulations seventeenth edition.
BS 7671: Amendment 2:
August 2013
Requirements for electrical installations, I.E.E. wiring regulations seventeenth edition.
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.
IGE/UP/1 - Edition 2:
Installation pipework on industrial and commercial premises.
IGEM/UP/2: - Edition 3:
Gas installation pipework, boosters and compressors on industrial and commercial premises.
IGEM/UP/4 - Edition 4:
Commissioning of gas-fired plant on industrial and commercial premises.
IGEM/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

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Third edition of the 1956 Clean Air Act Memorandum on Chimney Heights
2SAFETY GUIDELINES
Improper installation, adjustment, alteration, service or maintenance can cause property damage or
personal injury. Installation and service must be performed by a qualified installer or service agency
(who must read and follow the supplied instructions before installing, servicing, or removing this water
heater).
“A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the
burner. Do not try to light the burner by hand.”
“B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell close to the floor because
some gas is heavier than air and will settle on the floor.”
“C. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the control system and any gas control which has been un-
der water.”
Without written approval of the manufacturer the internals of the water heater may not be changed. When
these changes are executed without approval, the water heater certification is invalid.
WARNING: Water temperatures over 52 °C can cause severe burns instantly from scalding. The water tempera-
ture is factory set at 60 °C because of legionella prevention. Before bathing or showering always check the water
temperature.
When this heater is supplying general purpose hot water requirements for use by individuals, a thermo-
statically controlled mixing valve for reducing point of use water temperature is recommended to reduce the
risk of scald injury. Contact a licensed plumber or the local plumbing authority for further information.
This water heater is equipped with a air pressure switch in the event of a blocked vent the water heater will lock-
out. No attempt by the user/owner should be made to put the water heater back into operation. A qualified ser-
vice technician should be notified of the issue. The water heater should only be reset by a qualified service tech-
nician after they have diagnosed and corrected the issue that caused the safety lockout of the water heater.
Lochinvar Ltd recommends the installation of a carbon monoxide detector in the water heater room for all instal-
lations.

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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 mounting 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.
Important technical warnings and guidelines
Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.
Maintenance and inspection of the water heater should be carried out at the following conditions:
•When a number of similar error codes and/or lockouts appear.
•At least every 12 moths’ maintenance must be done to ensure safe and efficient operation.
Damage caused by lack of maintenance will not be covered under warranty.
3Water quality (also see § 8.1)
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 lime scale which will reduce operating efficiency and may
cause early product failure. Please note the following:-
•Hardness should not exceed 196 PPM CaCO3(11 °dH or 14 °Clark). If the waterflow is enlarged, a water
hardness up to 250 PPM (14 °dH or 17.5 °Clark) is acceptable.
•Water hardness leads to scale formation and may affect/damage the water heater. Hard water scaling
must be avoided or controlled by proper water treatment.
•TDS (Total Dissolved Solids) should not exceed 450 PPM
•Hardness and TDS together should not exceed 450 PPM
•pH value should be between 6.5 and 7.5, measured cold.
The actual values can be retrieved at your local water supplier.
If these values are exceeded a water treatment specialist should be consulted. Water Softeners and Water Condi-
tioners 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.
The formation of lime scale 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 cov-
ered under the product warranty.

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Water flow velocity and pump selection
For a given combination of water heaters and tanks, pump selection is very important with respect to the
required flow velocity. Use the water heater exchanger resistance graphs to calculate the pump needed
- Water flow velocity and pipe diameters and lengths
The arguments that hold for pump selection, hold for piping design as well: all piping components added up
are giving a certain total resistance which should not exceed a critical value at which the pump cannot realize
the required flow velocity anymore.
Following the instructions and recommendations given in the referred paragraphs will highly improve the func-
tioning and considerably lengthen the life time of your HW system.
Furthermore, for all Lochinvar Ltd appliances the next instructions and recommendations apply:
•Never use aluminium or aluminium containing flue gas outlet parts.
•Always fill the siphon before commissioning the water heater
•Always set the gas valve during commissioning of the water heater, for the first time and af-
ter maintenance and/or installation changes
•Never place a (ball) valve between the safety valve and the water heater
•In a log, keep track of all situations regarding the appliance:
what, when, by whom, what actions and/or changes, what communication has been per-
formed
Lochinvar Ltd is not liable for any damage caused by inaccurately following these instructions. Only Lochinvar Ltd
parts may be used when carrying out any repair or service works.
Do not use chlorine based products for brazing. When commissioning the water heater, the running of the water
heater pump must be checked before leaving the installation.
Firing the water heater without water flow (but filled with water) will cause a boiling noise and can damage the
heat exchanger.
The Outlet and Inlet temperature are checked continuously. The temperature difference may not exceed the pro-
grammed value belonging to the actual power mode. If it does, the water heater will go in a lock-out.
The applied DHW pump must be controlled only by the EFW water heater control. If, for any reason an
external pump control is applied without written approval of Lochinvar Ltd, the complete warranty on the
EFW water heater and all supplied parts will become invalid.
Minimum water pressure 1.0 bar.
Fuel used should have sulphur rates that comply with the next values: a maximum annual peak over a short pe-
riod of time of 150 mg/m3and an annual average of 30 mg/m3 maximum.
Combustion air must be free of contents of chlorine, ammonia and alkali agents. The air near a swimming pool, a
washing machine or a laundry is containing these ammonia contents.
If the water heater is used in combination with a hot water tank without any other heat exchanger; the water
heater should be equipped with a safety relief valve. The tank must be equipped with a T&P relief valve. Always
apply all applicable installation standards and regulations.
At first installation, the built-in automatic air vent should be open.

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LEGIONNAIRES’ DISEASE
An anti-Legionella function is present in the software but is default turned OFF. See this manual for the program-
ming options.
Safety valve
Hot water could be released when the safety valve is opened. This can result in severe personal injury.
Before operating the safety valve manually, check that it will discharge in a safe place. If water does not
flow freely from the end of the discharge pipe, turn the gas supply and power off and a call a qualified
person to determine the cause. Refer to the safety valve manufacturer’s instructions for inspection and
maintenance requirements.
DO NOT apply a closing valve or any other form of narrowing between the water heater and the safety valve, be-
cause this might disturb the correct functioning of the safety valve.
Lochinvar will supply a correctly sized safety valve with the unvented kit for the complete system based on indi-
vidual project requirements.
Water heater
Safety valves
All models
1” Safety Valve rated @ 7 bar
The EFW water heater and tank should be installed by a skilled installer according to all applicable standards and
regulations for tap water installations. Use the next scheme as guideline. When multiple water heaters and tanks
are applied, every combination has to be equipped with its own safety valve.
Typical system layout

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4TECHNICAL DATA EFW WATER HEATERS
Functional introduction
The EFW water heaters are water heaters with a maximum high efficiency. Such a performance can be reached
by, amongst other things, using a special heat exchanger made of stainless steel. This allows the flue gases to cool
down below the condensation point, and so release extra heat. This has an immediate positive impact on the effi-
ciency.
The water heater is set for Natural gas. (G20)
Fuel used should have Sulphur rates with a maximum annual peak over a short period of time of 150 mg/m3(110
ppm average) and an annual average of 30 mg/m3 . (22 ppm average)
Water heater control includes:
▪Cascade control for up to sixteen water heaters
▪Remote operation and heat demand indication from each water heater
▪Anti-Legionnaires’ disease function.
Connections for:
▪Water heater pump
▪PWM control for external water heater pump.
▪External flow switch or external safety device.
▪Modbus
▪External system sensor
▪Tank sensor.
▪External Ignition coil
Location of version numbers
Parameter Version
- To be found on the small sticker on the side of the
burner controller.
Burner Controller Hardware Version
–To be found on the second line of the white sticker
on the side of the burner controller.
v.B = “Version B” e.g.
E.g. 957MN25_3Ri4n
Burner Controller Software Versions
–Press the menu button , go to Information and then to Software Versions.
Information
Software Versions
Boiler Status
Boiler History
Error Log
i
Software Versions
Display [63EF 83BC]
Boiler [5C79 14A9]
Device Group 900MN

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Technical specifications datasheet
GENERAL
Product identification number:
0063CT3633
Gas Appliance Type
-
B23(P), C13, C33, C43,C53, C63,C83, C93
C(10)3, C(11)3, C(12)3, C(13)3, C(14)3 ,C(15)3
Type boiler
EFW 85
EFW 105
EFW 125
EFW 155
Classification UK
II2H3P
II2H3P
II2H3P
II2H3P
Dimensions (h x w x d)
mm
845 x 440 x 539
Water content estimated
litre
5.0
6.5
8.3
10.4
Weight (empty)
Kg
77
79
83
86
Flow/return connection (boiler)
Inch
R 1”
R 1”
R 1”
R 1¼”
Gas connection
Inch
R ¾”
R ¾”
R ¾”
R 1”
Flue connection twin pipe
mm
100
100
100
150
Flue connection concentric pipe
mm
100/150
100/150
100/150
N.A.
HEATING
Values min-max:
Nominal input (gross) (G20)
kW
17.1 - 90.7
20.7 - 108.1
26.2 - 132.6
38.9 - 161.4
Nominal input (net) (G20)
kW
15.4 - 81.7
18.6 - 97.3
23.6 - 119.4
35.0 - 145.3
Nominal input (gross) (G31)
kW
17.4 - 87.4
20.6 - 103.4
26.2 - 131.2
42.7 - 154.4
Nominal input (net) (G31)
kW
16.0 - 80.5
19.0 - 95.2
24.1 - 120.8
39.3 - 142.2
Nominal output 60/40 °C (G20)
kW
15.7 - 83.4
19.0 - 99.2
24.0 - 121.7
35.6 –147.5
Nominal output 50/30 °C (G20)
kW
16.0 - 85.1
19.5 - 101.8
24.7 - 124.7
36.4 - 151.0
Nominal output 37/30 °C (G20)
kW
16.6 - 88.4
20.2 - 105.5
25.6 - 129.4
38.0 - 157.8
Seasonal Efficiency (Part L2)
(BS EN 26) (60/40°C)
%
96.5%
96.5%
96.5%
96.6%
GAS CONSUMPTION Values min-max:
Natural gas (G20)
m3/h
1.6 –8.5
1.9 –10.2
2.5 –12.5
3.7 –15.3
Propane (G31) 1
m3/h
0.6 –3.2
0.8 –3.9
1.0 –4.8
1.6 –5.7
Gas supply pressure
nominal 2
G20
mbar
20
G31
mbar
37
EMISSION Values min-max:
O2flue gas 3
G20
%
6.9 - 6.0
6.9 - 6.0
6.9 - 6.0
6.9 - 6.0
G31
%
6.7 –4.9
6.7 –5.2
6.4 –5.2
6.4 –5.2
CO2flue gas 3
G20
%
7.9 –8.4
7.9 –8.4
7.9 –8.4
7.9 –8.4
G31
%
9.3 –10.5
9.3 –10.3
9.5 –10.3
9.5 –10.3
NOx class
-
6
Flue gas temperature at combustion air
temperature = 20 °C
°C
60 - 90
Mass flow flue gas (min/max)
g/s
8.0 - 42
10 - 51
12 - 62
15 - 76
Available pressure for the flue system 4
Pa
200
INSTALLATION
Resistance water heater
T = 12.5 K
m.W.C
9.00
9.50
9.56
8.53
T = 16.5 K
5.45
5.65
5.54
5.14
Pressure water heater max.
bar
8.0
Max. water temperature
°C
85
Pressure relief valve max. pressure
bar
10

E93.1804.014
15
Type boiler
EFW 85
EFW 105
EFW 125
EFW 155
ELECTRIC
Maximum power consumption 5
W
190
280
280
280
Power supply
V/Hz
230 / 50
Protection class 6
-
IPX4D
NOTES
1Using propane, a restriction needs to be placed and the maximum fan speed needs to be reduced
2Min. and max. gas supply pressures:
p nom [mbar]
p min [mbar]
p max [mbar]
G20
20
17
25
G31
37
25
45
3O2/ CO2of the unit measured/set without the water heater front panel in place
4Maximum allowed combined resistance of flue gas and air supply piping at high fire
5Power consumption is measured without circulation pump
6For gas appliance type B23(P) only class IPX4D with special air inlet (see § 5.1 "Accessories"), otherwise the protec-
tion class is IP20.
Table technical specifications ERP
Type water heater:
EFW 85
EFW 105
EFW 125
EFW 155
Load profile
Unit
XXL
XXL
3XL
3XL
Water heating energy efficiency (ηwh)
%
85.9
85.6
89.6
89.1
Daily fuel consumption (Qfuel)
kWh
27.84
27.8
51.54
51.73
Daily electricity consumption (Qelec)
kWh
0.292
0.346
0.26
0.289
Emissions of nitrogen oxides
mg/kWh
23.1
21.3
23.9
20.1
(EN15502-1:2012+A1:2015)
Sound power level, indoors (LWA)
dB(A)
65.8
68
67.8
73
(EN 15036-1:2006)
A water tank is needed when applying a EFW water heater appliance.
The efficiency of the complete installation depends on:
• type of water tank.
• volume of the water tank.
• number of tanks
• number of water heaters
• type of circulation pump.
• length of the connecting pipes.
• insulation of the connecting pipes.
The load profile might be higher depending on the applied tank volume.
Boiler is IP20 applying a dust filter or
bird screen only
Boiler is IPX4D applying a dust fil-
ter or bird screen with two elbows
and if necessary, a short straight
pipe.

E93.1804.014
16
5DIMENSIONS & CONNECTIONS
EFW 85 & EFW 105
Twin Pipe Concentric
Connections
Twin Pipe
Concentric
A
Hot water Outlet
BSP 1”
B
Cold water Inlet
BSP 1”
C
Condensate
Flexible hose Ø 25 / 21 mm
D
Gas
BSP ¾”
E / F
Flue gas / Air inlet
100 / 100 mm
100 / 150 mm

E93.1804.014
17
EFW 125
Twin pipe Concentric
Connections
Twin Pipe
Concentric
A
Hot water Outlet
BSP 1”
B
Cold water Inlet
BSP 1”
C
Condensate
Flexible hose Ø 25 / 21 mm
D
Gas
BSP ¾”
E / F
Flue gas / Air inlet
100 / 100 mm
100 / 150 mm

E93.1804.014
18
EFW 155
Twin pipe
Connections
Twin Pipe
A
Hot water Outlet
BSP 1¼”
B
Cold water Inlet
BSP 1¼”
C
Condensate
Flexible hose Ø 25 / 21 mm
D
Gas
BSP 1”
E / F
Flue gas / Air inlet
150 / 150 mm

E93.1804.014
19
EFW 85 –125 Flue Spigot Dimensions
5.4.1 100 /150 MM COAXIAL FLUE SPIGOT
Mat
Unit
dnom
[mm]
Doutside
[mm]
dinside
[mm]
Linsert
[mm]
SS
EFW 85, 105, 125
100
100 + 0.3 / - 0.7
101 + 0.3 / - 0.3
50 + 2 / - 2
SS
EFW 85, 105, 125
150
150 + 0.3 / - 0.7
151 + 0.5 / - 0.5
50 + 2 / - 2
PP
EFW 85, 105, 125
100
100 + 0.6 / - 0.6
50 + 2 / - 2
PP
EFW 85, 105, 125
150
150 + 0.9 / - 0.9
50 + 2 / - 2
5.4.2 2X100 MM TWIN FLUE SPIGOTS
Mat
Unit
dnom
[mm]
Doutside
[mm]
dinside
[mm]
Linsert
[mm]
SS
EFW 85, 105, 125
100
100 + 0.3 / - 0.7
101 + 0.3 / - 0.3
83
PP
EFW 85, 105, 125
100
100 + 0.6 / - 0.6
114

E93.1804.014
20
EFW 155 Flue Spigot Dimensions
5.5.1 2X150 MM TWIN FLUE SPIGOTS
Mat
Unit
dnom
[mm]
Doutside
[mm]
dinside
[mm]
Linsert
[mm]
SS
EFW 155
150
150 + 0.3 / - 0.7
151 + 0.5 / - 0.5
102
PP
EFW 155
150
150 + 0.9 / - 0.9
153