Lochinvar EFW85 EcoForce Water Heater

Product Information

The EFW Water heater range Flue Guide provides information on the flue systems compatible with the following models: EFW85, EFW105, EFW125, EFW155.

Twin-Pipe Flue Systems Type C53
This section of the guide provides information and calculations for twin- pipe flue systems. It includes sizing calculations for the flue.

Conventional (Exhaust Only) Flue Systems Type B23
This section of the guide provides information and calculations for conventional flue systems. It includes sizing calculations for the flue.

Common Flue Systems
This section of the guide provides information on common flue systems, which are designed for multiple appliances. It includes an order form and notes for reference.

Product Usage Instructions

The Lochinvar EFW Water heaters are certified for use on different flue categories. The installation type categories are as follows

• B23: Open flue – The appliance is connected to a flue that evacuates the products of combustion to the outside of the room. The combustion air is drawn directly from the room.
• C13: Closed Flue – The appliance is connected to a concentric or twin-pipe flue system with a horizontal flue terminal. The air inlet and flue exhaust must be in the same pressure zone.
• C33: Closed Flue – The appliance is connected to a concentric or twin-pipe flue system with a vertical flue terminal. The air inlet and flue exhaust must be in the same pressure zone.
• C43: Closed Flue – The appliance is connected to a common air inlet and flue exhaust system designed for multiple appliances. The common system has a single air inlet and flue exhaust and is part of the building, not the appliance.
• C53: Closed Flue – The appliance is connected to a twin-pipe flue system with a horizontal or vertical flue  terminal. The air inlet and flue exhaust may be in different pressure zones.
• C63: Closed Flue – The appliance is intended to be connected to a separately approved and marketed system for the supply of combustion air and discharge of combustion products.
• C83: Closed Flue – The appliance is connected to a duct system. One duct evacuates the products of combustion, while the other supplies air to the appliance from outside the building.

All installations should comply with the requirements of BS5440-1:2008 for appliances up to 70kW net input. Refer to drawing 1 and table 1 in the guide for details of terminal locations.

DOCUMENT CONTROL

GENERAL
Lochinvar EFW Water heaters are certified for use on the following flue categories

evacuates the products of combustion to the outside of the room containing the appliance. The combustion air is drawn directly from the room.
C13| Closed Flue| An appliance connected to either a concentric or twin- pipe flue system with a Horizontal flue terminal. Both the air inlet and flue exhaust must be in the same pressure zone.
C33| Closed Flue| An appliance connected to either a concentric or twin- pipe flue system with a Vertical flue terminal. Both the air inlet and flue exhaust must be in the same pressure zone.
C43| Closed Flue| An appliance connected to a common air inlet and flue exhaust system, which is designed for more than one appliance. This common system has a single air inlet and flue exhaust and is part of the building not the appliance.
C53| Closed Flue| An appliance connected to a twin-pipe flue system with a Horizontal or Vertical flue terminal. Both air inlet and flue exhaust may be in different pressure zones.
C63| Closed Flue| An appliance intended to be connected to a separately approved and marketed system for the supply of combustion air and discharge of combustion products (i.e. other than that supplied by the water heater manufacturer).
C83| Closed Flue| An appliance connected via one of its ducts to a single or common duct system. This duct system consists of a single natural draught duct (i.e. not incorporating a fan) that evacuates the products of combustion. The appliance is connected via a second of its ducts to a terminal, which supplies air to the appliance

from outside the building.

All installations should comply with the requirements of

1. For appliances up to 70kW net input- BS5440-1:2008- 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.
   • Refer to drawing 1 and table 1 for details of terminal locations.
2. For appliances over 70kW net input- IGEM/UP/10 Edition 4 +A: 2016 – Installation of flued gas appliances in industrial and commercial premises, specific attention should be paid to the following sections.
   • Refer to drawing 1 and table 1 for details of terminal locations.
   • Horizontal terminations shall be located according to the minimum distances given in table 1, and subject to the risk assessment criteria shown in table 2.
   • Horizontal flue terminations (other than for fan dilution systems) must not be installed for any single appliance or group of appliances with a total nett input exceeding 333kW net heat input.
   • For any single appliance or group of appliances with a total net heat input exceeding 333 kW, the general requirements of IGEM/UP/10 Edition 4 +A: 2016 shall apply and approval must be sought from the Local Authority prior to commencement of the installation.
3. The Clean Air Act for installations exceeding 333kW nets input.

DRAWING 1 WATER HEATER TERMINAL LOCATIONS

TABLE 1 WATER HEATER TERMINAL LOCATIONS

assessment
G| From a vertical drain or soil pipe| mm| 150| 150| 150| 150
H| From an internal or external corner| mm| 1210| 1560| 2057| 2640
I| Above ground, roof, or balcony level| mm| 300| 300| 300| 300
J| From a surface facing the terminal| mm| 1211| 1560| 2057| 2640
K| From a terminal facing the terminal| mm| 2176| 2468| 2883| 3370
L| From an opening in the car port (e.g., door, window) into the dwelling| mm| Not recommended see UP10 risk assessment
M| Vertically from a terminal on the same wall| mm| 2500| 2500| 2500| 2500
N| Horizontally from a terminal on the same wall*| mm| 600| 600| 900| 900
N+| Vertically from a terminal on the same roof| mm| 600| 600| 900| 900
P| From a vertical structure on the roof| mm| 1500| 1500| 1500| 1500
Q| Above intersection with the roof| mm| 324| 364| 422| 489

• *distances shown ensure the Water heaters will operate without problems under most conditions, these distances can be reduced in certain circumstances contact Lochinvar Technical support for assistance if required.
• **multiple Water heater installation of model CPM175 are covered by the clean air act and must comply with its requirements # see UP10 figure 7 for full clarification

TABLE 2 RISK ASSESMENT
The table below is an excerpt from IGEMUP10 and should be used in conjunction with that document

Further to the requirements in IGEM/UP/10 Edition 4 +A: 2016 Section 8 under clause 8.7.3.3 and Figure 7 the following risk assessment gives guidance for the positioning of horizontal flues. This form should be completed before work commences and undertaken by a person who is competent to undertake the risk assessment.

Type C appliances with net heat input exceeding 70 kW and not exceeding 333 kW low level flue discharge risk assessment (including net heat input for groups of appliances)

No.| Regarding the flue position| No| Yes
1| Is the proposed flue termination within the distance in Figure K of a road, path, track, thoroughfare, walkway, property boundary or area, which is used for general public access other than for maintenance purposes?| No| Yes
2| Is the proposed flue termination within the distance in Figure K to a playground, school, yard, seating area, or area where there may be a public gathering| No| Yes
3| If the proposed flue termination enclosed on more than two sides, then does it comply with the requirements of Figure 11B?| No| Yes
4| Is the proposed flue termination within the distance in Figure K of a surface or building element that may be affected by corrosion or deterioration from plume

condensate?

| No| Yes
5| Is the proposed flue position in an area where vehicles could be parked within distances from Figure 12 Line G to the flue?| No| Yes
6| Are there shrubs or trees within minimum distances shown on Figure K of the proposed terminal position?| No| Yes
7| Is the proposed flue termination within a light well?| No| Yes
8| Are the products of combustion from the proposed flue position likely to build up under unfavourable atmospheric conditions, due to poor cross flow of air caused by enclosures or adjacent structures and/or likely to cause nuisance?| No| Yes
9| Is the flue termination position likely to cause a nuisance to adjoining properties?| No| Yes
Building Regulations part J
10| Is the proposed flue termination less than 300 mm from the boundary of the property, as measured from the side of the terminal to the boundary?| No| Yes
Regarding the Clean Air Act
11| Is the total output of the individual, or group of flue terminals (if within 5U (see A3.7)), greater than 333 kW net heat input?| No| Yes
General
12| Are there any other considerations that are required for this risk assessment, see separate sheet.| No| Yes
13| Comments:| |
| | | | | | | | |
If all answers are Blue, then the flue position should be suitable
If any answer is Orange, then the flue position is unsuitable, consider revising the position or type of flue outlet or contact the local Environmental Health officer for assistance and/or approval

WATER HEATER FLUE INFORMATION

FLUE DATA TYPE B 23
Nominal flue diameter| mm| 100| 150
Maximum flue gas temp| °C| 90
Flue gas temperature| °C| 60-90
Flue draught requirements| mbar| -0.03 to -0.1
Available pressure for the flue system| Pa| 200
Maximum flue gas volume| g/s| 28.9| 38.6| 71.7| 86.2
FLUE DATA TYPE C 13 & C 33
Nominal flue diameter| mm| 100/150| N/A
Flue gas temperature| °C| 60-90
FLUE DATA TYPE C 43 & C 53
Nominal flue diameter| mm| 100| 150
Flue gas temperature| °C| 60-90

CONCENTRIC FLUE SYSTEMS
HORIZONTAL TYPE C13

CPMH003 CONCENTRIC HORIZONTAL FLUE ASSEMBLY

MODELS – EFW85, EFW105, EFW125

COMPONENTS INCLUDED
Item No.| Description| Included
LV310758B| CONCENTRIC HORIZONTAL TERMINAL Ø100/150mm PP| 1
M84410B| CONCENTRIC BEND 90° Ø100/150mm PP SHORT RADIUS| 1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items
Item No.| Description
M84405B| CONCENTRIC EXTENSION Ø100/150mm Cuttable
M84402B| CONCENTRIC EXTENSION Ø100/150mm PP FIXED
M84412B| CONCENTRIC BEND 90° Ø100/150mm PP (A=223mm B=208mm)
M84413B| CONCENTRIC BEND 45° Ø100/150mm PP (A=128mm B=128mm)
M84421B| SAMPLING POINT Ø100/150mm PP
M87196B| WALL CLAMP Ø150mm

EFW Models 155 are not suitable for Concentric flue installations

PLUME MANAGEMENT KITS
For installations where the flue exhaust may present a nuisance pluming problem but is installed as per IGEM/UP/10 then Lochinvar can offer a plume management kit as below.

LG800009B CONCENTRIC HORIZONTAL PLUME ASSEMBLY

MODELS – EFW85, EFW105

COMPONENTS INCLUDED
Item No.| Description| Included
1| CONCENTRIC BEND 90° Ø100/150mm PP SHORT RADIUS| 1
2| CONCENTRIC EXTENSION Ø100/150mm WITH TERMINAL BEND| 1
3| EXTENSION Ø100mm (1000mm) PP (black for external use)| 1
4| BEND 90° Ø100mm PP (black for external use)| 1
5| SPRING| 1
6| FLUE EXHAUST Ø100mm (black for external use)| 1
7| WALL BAND Ø100mm (black for external use)| 1

The flue terminal location before the Plume kit is fitted must comply with the guidance shown  within the EFW Installation manual and the requirements of IGEM/UP/10.
The plume kit cannot be used with models EFW125-EFW155 due to the high resistance within the kit
Due to the high resistance within the plume kit, no further extensions or bends are allowed

VERTICAL TYPE C33

CPMV003 CONCENTRIC VERTICAL FLUE ASSEMBLY MODELS – EFW85, EFW105, EFW125

COMPONENTS INCLUDED
Item No.| Description| Included
LV310754B| CONCENTRIC VERTICAL TERMINAL Ø100/150mm PP| 1
M84405B| CONCENTRIC EXTENSION Ø100/150mm (500mm) Cuttable| 1
M84402B| CONCENTRIC EXTENSION Ø100/150mm (1000mm) PP FIXED| 1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items

Item No.| Description
M84405B| CONCENTRIC EXTENSION Ø100/150mm Cuttable 500mm
M84402B| CONCENTRIC EXTENSION Ø100/150mm PP FIXED 1000mm
M84412B| CONCENTRIC BEND 90° Ø100/150mm PP (A=223mm B=208mm)
M84413B| CONCENTRIC BEND 45° Ø100/150mm PP (A=128mm B=128mm)
M84421B| SAMPLING POINT Ø100/150mm PP
M87196B| WALL CLAMP Ø150mm
LV306017B| SLOPING ROOF FLASHING Ø100/150mm (25°-45°) LEAD
LV302509B| FLAT ROOF FLASHING (170mm) ALU

EFW Models 155 are not suitable for Concentric flue installations

CONCENTRIC FLUE SIZING CALCULATIONS
Maximum Length – Concentric Flue The resistance of the components within the flue determines the maximum length of the flue system.

• The resistance must not exceed 200 Pa.
• The information shown in table below is for the Lochinvar supplied flue system only; other flue system suppliers may have different values.

Resistance in the flue system components

Concentric| Water heater| EFW 85| EFW 105| EFW 125| EFW 155
---|---|---|---|---|---
Item| resistance [Pa]
flue gas| 100/150| Straight tube/m| 2.9| 4.1| 6.2| –
45° bend| 6.4| 9.0| 13.6| –
90° bend| 10.2| 14.5| 21.9| –
roof terminal| 31.2| 44.3| 66.7| –
wall terminal| 10.8| 15.3| 23.0| –
adaptor| 0.4| 0.6| 0.9| –
air supply| 100/150| Straight tube/m| 9.2| 13.1| 19.7| –
45° bend| 8.1| 11.4| 17.2| –
90° bend| 11.7| 16.6| 25.1| –
roof terminal| 43.3| 61.4| 92.4| –
wall terminal| 43.3| 61.4| 92.4| –
adaptor| 39.2| 55.6| 83.8| –

• • Never reduce pipe diameters relative to Water heater connections
• Example : Concentric Horizontal flue system

Calculation example with given lengths: checking resistance.

total
Straight tube m| total| 9| 2.9| 26.1
Bend| 90°| 1| 10.2| 10.2
Concentric terminal| wall| 1| 10.8| 10.8
resistance flue gas outlet| 47.1
AIR SUPPLY| Diameter:  100/150 mm.| quantity| Pa| Pa total
Straight tube m| total| 9| 9.2| 82.8
Bend| 90°| 1| 11.7| 11.7
Concentric terminal| wall| 1| 43.3| 43.3
resistance air supply| 137.8
| Total resistance flue gas outlet and air supply| 184.9**

The total resistance is less than 200 Pa. This flue gas / air supply system is OK.

TWIN-PIPE FLUE SYSTEMS TYPE C53

Introduction Twin-Pipe and Conventional Flue Systems
Due to the varying and sometimes complex nature of twin-pipe and conventional flue systems Lochinvar do not offer a standard flue kit for these flue types. The following pages show the flue components available including the items that MUST BE ORDERED to start and terminate the system.

TWIN-PIPE FLUE SYSTEMS MODELS – EFW85, EFW105, EFW125

COMPONENTS REQUIRED TO START INSTALLATION
VERTICAL FLUE
Item No.| Description| Number

Required

LE04018220| CONCENTRIC TO TWIN PIPE ADAPTER Ø100/150-2X 100| 1
LM410084006| VERTICAL TERMINAL – 130MM PP| 1
LM410084992| EXPANDER Ø100mm – Ø130mm PP| 1
LV305039| HORIZONTAL AIR INLET Ø100mm ALU| 1
HORIZONTAL FLUE
Item No.| Description| Number Required
LE04018220| CONCENTRIC TO TWIN PIPE ADAPTER Ø100/150-2X 100| 1
LV310758| CONCENTRIC HORIZONTAL TERMINAL Ø100/150mm PP| 1
LV305039| HORIZONTAL AIR INLET Ø100mm ALU| 1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items

Item No.| Description
M85176| EXTENSION Ø100mm (500mm) PP
M85177| EXTENSION Ø100mm (1000mm) PP
M85181| BEND 90° Ø100mm PP (A=115mm B=115mm)
M85182| BEND 45° Ø100mm PP (A=78mm B=65mm)
M87193| WALL BAND Ø100mm

EFW Models 155 are not suitable for Twin-pipe flue installations

TWIN-PIPE FLUE SIZING CALCULATIONS
Maximum Length – Twin-Pipe Flue The resistance of the components within the flue determines the maximum length of the flue system.

• The resistance must not exceed 200 Pa.
• The information shown in table below is for the Lochinvar supplied flue system only; other flue system suppliers may have different values.

Twin- pipe| WATER HEATER| EFW 85| EFW 105| EFW 125| EFW 155
---|---|---|---|---|---
Item| resistance [Pa]
flue gas| 100| straight tube/m| 2.8| 4| 6| –
45° bend| 6.4| 9| 13.6| –
90° bend| 10.2| 14.5| 21.9| –
Flue outlet zeta=0.05| 0.5| 0.8| 1.2| –
Flue outlet zeta=1.0| 10.8| 15.3| 23| –
Flue outlet zeta=1.5| 16.2| 22.9| 34.5| –
130| straight tube/m| 0.7| 1| 1.5| 2.2
45° bend| 1.3| 1.8| 2.7| 4
90° bend| 3| 4.3| 6.4| 9.5
Flue outlet zeta=0.05| 0.2| 0.3| 0.4| 0.6
Flue outlet zeta=1.0| 3.6| 5.1| 7.7| 11.4
Flue outlet zeta=1.5| 5.4| 7.7| 11.6| 17.2
150| straight tube/m| 0.4| 0.6| 0.9| 1.3
45° bend| 0.7| 0.9| 1.4| 2.1
90° bend| 1.6| 2.2| 3.3| 4.9
Flue outlet zeta=0.05| 0.1| 0.1| 0.2| 0.3
Flue outlet zeta=1.0| 2| 2.8| 4.3| 6.3
Flue outlet zeta=1.5| 3| 4.3| 6.4| 9.5
Roof terminal| 3.4| 4.8| 7.3| 10.8
reducer 150 to 130| 2.1| 3| 4.5| 6.6
air supply| 100| straight tube/m| 3.2| 4.6| 6.9| –
45° bend| 7.4| 10.5| 15.7| –
90° bend| 11.9| 16.8| 25.3| –
air inlet zeta=1.0| 12.5| 17.7| 26.7| –
130| straight tube/m| 0.8| 1.1| 1.7| 2.5
45° bend| 1.5| 2.1| 3.1| 4.6
90° bend| 3.5| 4.9| 7.4| 11
air inlet zeta=1.0| 4.2| 5.9| 9| 13.3
150| straight tube/m| 0.5| 0.7| 1| 1.5
45° bend| 0.8| 1.1| 1.6| 2.4
90° bend| 1.8| 2.6| 3.9| 5.7
air inlet zeta=1.0| 2.3| 3.3| 5| 7.3

• • Never reduce pipe diameters relative to Water heater connections

This table may only be used for a single flue/air system for one Water heater
Do NOT use this table for common flue systems with cascade Water heaters.

Example: Twin-Pipe flue system

Calculation example with given lengths: checking resistance.

The total resistance is > than 200 Pa.
This flue gas/ air supply system is UNSUITABLE. Consider using 150mm flue pipe or altering the flue and air supply route.

CONVENTIONAL (EXHAUST ONLY) FLUE SYSTEMS TYPE B23

CONVENTIONAL FLUE SYSTEMS MODELS – EFW85, EFW105, EFW125

COMPONENTS REQUIRED TO START INSTALLATION
VERTICAL FLUE
Item No.| Description| Number Required
LE022500019| AIR INLET GUARD| 1
LV310754B| CONCENTRIC VERTICAL TERMINAL Ø100/150mm PP| 1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items

Item No.| Description
M85176B| EXTENSION Ø100mm (500mm) PP
M85177B| EXTENSION Ø100mm (1000mm) PP
M85181B| BEND 90° Ø100mm PP (A=115mm B=115mm)
M85182B| BEND 45° Ø100mm PP (A=78mm B=65mm)
M87193B| WALL BAND Ø100mm
LV306017B| SLOPING ROOF FLASHING Ø100/150mm (25°-45°) LEAD
LV302509B| FLAT ROOF FLASHING (170mm) ALU

CONVENTIONAL FLUE SYSTEMS MODELS – EFW155

COMPONENTS REQUIRED TO START INSTALLATION
VERTICAL FLUE
Item No.| Description| Number Required
M70359B| ROOF TERMINAL – 150MM| 1
LE022500018| AIR INLET GUARD| 1
Maximum resistance in the flue system ≤200pa
Additional Flue Ancillary Items

Item No.| Description
LV310694B| EXTENSION Ø150mm (1000mm) PP Cutable
LV310695B| EXTENSION Ø150mm (2000mm) PP Cutable
LV310664B| BEND 45° Ø150mm PP (A=98mm B=103mm)
LV310665B| BEND 90° Ø150mm PP (A=183mm B=166mm)
M87196B| WALL CLAMP Ø150mm

CONVENTIONAL FLUE SIZING CALCULATIONS
Maximum Length – Conventional Flue The resistance of the components within the flue determines the maximum length of the flue system.

• The resistance must not exceed 200 Pa.
• The information shown in table below is for the Lochinvar supplied flue system only; other flue

Twin- pipe| WATER HEATER| EFW 85| EFW 105| EFW 125| EFW 155
---|---|---|---|---|---
Item| resistance [Pa]
flue gas| 100| straight tube/m| 2.8| 4| 6| –
45° bend| 6.4| 9| 13.6| –
90° bend| 10.2| 14.5| 21.9| –
Flue outlet zeta=0.05| 0.5| 0.8| 1.2| –
Flue outlet zeta=1.0| 10.8| 15.3| 23| –
Flue outlet zeta=1.5| 16.2| 22.9| 34.5| –
130| straight tube/m| 0.7| 1| 1.5| 2.2
45° bend| 1.3| 1.8| 2.7| 4
90° bend| 3| 4.3| 6.4| 9.5
Flue outlet zeta=0.05| 0.2| 0.3| 0.4| 0.6
Flue outlet zeta=1.0| 3.6| 5.1| 7.7| 11.4
Flue outlet zeta=1.5| 5.4| 7.7| 11.6| 17.2
150| straight tube/m| 0.4| 0.6| 0.9| 1.3
45° bend| 0.7| 0.9| 1.4| 2.1
90° bend| 1.6| 2.2| 3.3| 4.9
Flue outlet zeta=0.05| 0.1| 0.1| 0.2| 0.3
Flue outlet zeta=1.0| 2| 2.8| 4.3| 6.3
Flue outlet zeta=1.5| 3| 4.3| 6.4| 9.5
Roof terminal| 3.4| 4.8| 7.3| 10.8
reducer 150 to 130| 2.1| 3| 4.5| 6.6
air supply| 100| straight tube/m| 3.2| 4.6| 6.9| –
45° bend| 7.4| 10.5| 15.7| –
90° bend| 11.9| 16.8| 25.3| –
air inlet zeta=1.0| 12.5| 17.7| 26.7| –
130| straight tube/m| 0.8| 1.1| 1.7| 2.5
45° bend| 1.5| 2.1| 3.1| 4.6
90° bend| 3.5| 4.9| 7.4| 11
air inlet zeta=1.0| 4.2| 5.9| 9| 13.3
150| straight tube/m| 0.5| 0.7| 1| 1.5
45° bend| 0.8| 1.1| 1.6| 2.4
90° bend| 1.8| 2.6| 3.9| 5.7
air inlet zeta=1.0| 2.3| 3.3| 5| 7.3

Example: Single flue gas outlet. Air supply from Water heater room

Calculation example with given lengths: checking resistance.

The total resistance is less than 200 Pa. This flue gas system is OK.

Calculation example with given lengths: checking resistance.

The total resistance is less than 200 Pa. This flue gas system is OK.

COMMON FLUE SYSTEMS
Applicable only when installer not using the Lochinvar supplied flue system.
EFW Water heaters are certified for use on common (over pressure) flue systems of the following type

1. C10 (3) Flue gas discharge through individual or shared flue ducting built into the building.
   • Air supply inlet and flue gas outlet
   • Condensate is not allowed to enter the Water heater.
   • Closed or open-air supply from outside or room
2. C12 (3) Flue gas discharge through individual or shared flue ducting built into the building.
   • Air supply inlet and flue gas outlet
   • Condensate is not allowed to enter the Water heater.
   • Closed air supply from outside.

Technical data

measured at the flue outlet of a non-firing Water heater

Flue specification

CE string flue gas material| European standard| Temperature class| Pressure class| Resistance to condensate| Corrosion resistance class| Metal: liner specifications| Soot fire resistance class| Distance to combustible| Plastics: location| Plastics: fire behaviour| Plastics: enclosure
---|---|---|---|---|---|---|---|---|---|---|---
Min. req. PP| EN 14471| T120| P1| W| 1| | O| 30| I of E| C/E| L
Min. req. SS| EN 1856-1| T120| P1| W| 1| L20040| O| 40| | |

Safety measures Common Flue Systems
When installing EFW Water heaters with a common flue system and the combustion air is drawn directly from the room, additional safety measures must be taken.

Potential hazard
EFW Water heaters are equipped with a non-return valve to prevent recirculation of flue gases from a firing Water heater through one or more Water heaters which are not running and are connected with a common flue system. This Non-return valve might leak over time due to pollution, incorrect maintenance, or other unexpected cause. When combustion air is drawn from the room, flue gas might enter the room, which could lead to Carbon Monoxide (CO) poisoning.

Safety measures
To cover this risk additional checks/safety measures should be considered

1. Combustion and cooling air must be provided as per the requirements shown within the EFW Installation manual and the requirements of IGEM UP10 and BS6644 and the Gas safety regulations.
2. Always use the standard built in EFW cascade manager and ensure power mode 2 is switched on. Power mode 2 is selected at parameter 148.

Additional Safety Advice

1. Consider the use of a CO detector for alarm and as a switching module to switch off all the Water heaters. The CO alarm system must be in according with national and local standards. See EFW Installation manual for further details.
2. Consider combining all air intake terminals to the Water heaters; this does not have to be piped to outside air.

ORDER FORM AND NOTES

Notes-Items to order

Item No.| No required| Notes
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Contact Lochinvar customer service to order additional flue items on 01295 269981.

8 Lombard Way, The MXL Centre, Banbury, Oxon, 0X16 4T]

• Tel : +44(0) 1295 269 981,
• Fax : +44(0) 1295 271 640,
• Email : [email protected]
• www.lochinvar.Itd.uk

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