Lochinvar LBF81 Guide

The LBF range
High Efficiency Gas Fired Water Heaters
Installation, Commissioning & Maintenance
Instructions
Models:
LBF81
LBF121
LBF151
LBF171
LBF221
LBF301
LBF401
INS0044 Issue No 2 | July 2013

Table of Contents
1.0 INTRODUCTION ......................................................................................................................................................................................................................................5
2.0 PRINCIPAL PARTS..................................................................................................................................................................................................................................6
2.1 DIMENSIONAL DRAWINGS ............................................................................................................................................................................................................9
3.0 TECHNICAL DATA.................................................................................................................................................................................................................................11
4.0 GENERAL REQUIREMENTS ................................................................................................................................................................................................................12
4.1 RELATED DOCUMENTS ...............................................................................................................................................................................................................12
5.0 WATER QUALITY ..................................................................................................................................................................................................................................13
5.1 ELECTRICAL ANODE PROTECTION SYSTEM...........................................................................................................................................................................13
6.0 LOCATION..............................................................................................................................................................................................................................................13
6.1 PLANT ROOM REQUIREMENTS ..................................................................................................................................................................................................13
6.2 GENERAL REQUIREMENTS.........................................................................................................................................................................................................13
6.3 CLEARANCES................................................................................................................................................................................................................................14
7.0 GAS SUPPLY .........................................................................................................................................................................................................................................14
7.1 SERVICE PIPES.............................................................................................................................................................................................................................14
7.2 METERS..........................................................................................................................................................................................................................................14
7.3 GAS SUPPLY PIPES......................................................................................................................................................................................................................14
7.4 BOOSTED SUPPLIES ....................................................................................................................................................................................................................14
7.5 PLANT-ROOM CONTROL VALVE ................................................................................................................................................................................................14
7.6 EQUIPMENT GAS SYSTEM LEAK CHECK..................................................................................................................................................................................14
8.0 FLUE HOOD ASSEMBLY LBF151 - LBF401 ........................................................................................................................................................................................15
8.1 UNPACKING THE FLUE HOOD ....................................................................................................................................................................................................15
8.2 FLUE HOOD INSTALLATION ........................................................................................................................................................................................................15
9.0 FLUE SYSTEM.......................................................................................................................................................................................................................................21
9.1 FLUE SYSTEM GENERAL REQUIREMENTS ..............................................................................................................................................................................21
9.2 APPROVED FLUE SYSTEM..........................................................................................................................................................................................................21
9.3 CONCENTRIC FLUE SYSTEM......................................................................................................................................................................................................22
9.3.1 HORIZONTAL CONCENTRIC FLUE FITTING DETAILS LBF81/121...................................................................................................................................22
9.3.2 VERTICAL CONCENTRIC FLUE FITTING DETAILS LBF81/121 ........................................................................................................................................23
9.3.3 HORIZONTAL CONCENTRIC FLUE FITTING DETAILS LBF151 –401..............................................................................................................................24
9.3.4 VERTICAL CONCENTRIC FLUE FITTING DETAILS LBF151 –401 ...................................................................................................................................25
9.4 TWIN PIPE FLUE SYTEM ..............................................................................................................................................................................................................26
9.4.1 HORIZONTAL TWIN PIPE FLUE FITTING DETAILS LBF81/121 ........................................................................................................................................26
9.4.2 VERTICAL TWIN PIPE FLUE FITTING DETAILS LBF81/121 ..............................................................................................................................................27
9.4.3 HORIZONTAL TWIN PIPE FLUE FITTING DETAILS LBF151 –401 ...................................................................................................................................28
9.4.4 VERTICAL TWIN PIPE FLUE FITTING DETAILS LBF151 –401 .........................................................................................................................................29
9.5 MAXIMUM FLUE LENGTH - CONCENTRIC.................................................................................................................................................................................30
9.6 MAXIMUM FLUE LENGTH –TWIN-PIPE......................................................................................................................................................................................30
9.6.1 AIR RESTRICTION PLATE ....................................................................................................................................................................................................30
9.7 FLUE DISCHARGE.........................................................................................................................................................................................................................31
9.8 FLUE HOOD POSITION.................................................................................................................................................................................................................31
9.9 FLUE TERMINAL GUARDING .......................................................................................................................................................................................................31
10.0 AIR SUPPLY...........................................................................................................................................................................................................................................31
10.1 COMBUSTION VENTILATION.......................................................................................................................................................................................................31
10.2 COOLING VENTILATION...............................................................................................................................................................................................................31
11.0 WATER CONNECTIONS .......................................................................................................................................................................................................................32
11.1 GENERAL .......................................................................................................................................................................................................................................32
11.1.1 SYSTEM DE-STRATIFICATION.....................................................................................................................................................................................32
11.2 OPEN VENTED SYSTEM ARRANGEMENT.................................................................................................................................................................................32
11.3 UNVENTED SYSTEM ARRANGEMENT .......................................................................................................................................................................................32
11.3.1 EXPANSION VESSEL SIZING .......................................................................................................................................................................................35
12.0 ELECTRICAL SUPPLY ..........................................................................................................................................................................................................................35
12.1 ELECTRICAL CONNECTION ........................................................................................................................................................................................................35
12.2 EXTERNAL CONTROLS ................................................................................................................................................................................................................36
12.3 ARC WELDING PRECAUTIONS ...................................................................................................................................................................................................36
12.4 ANCILLARY EQUIPMENT..............................................................................................................................................................................................................36
12.5 WIRING DIAGRAMS.......................................................................................................................................................................................................................37
13.0 COMMISSIONING AND TESTING ........................................................................................................................................................................................................39
13.1 ELECTRICAL INSTALLATION.......................................................................................................................................................................................................39
13.2 GAS INSTALLATION......................................................................................................................................................................................................................39
13.3 WATER CONNECTIONS ...............................................................................................................................................................................................................39
13.4 COMMISSIONING THE EQUIPMENT ...........................................................................................................................................................................................39
13.4.1 GENERAL CHECKS PRIOR TO LIGHTING ..................................................................................................................................................................39
13.4.2 EQUIPMENT CHECKS PRIOR TO LIGHTING ..............................................................................................................................................................39
13.4.3 CONTROL PANEL ..........................................................................................................................................................................................................40
13.4.4 PROCEDURE FOR INITIAL LIGHTING .........................................................................................................................................................................40
13.4.5 GAS PRESSURE ADJUSTMENT...................................................................................................................................................................................41
13.5 TEMPERATURE ADJUSTMENT PROCEDURE...........................................................................................................................................................................42
14.0 LPG FUEL...............................................................................................................................................................................................................................................42
14.1 RELATED DOCUMENTS ...............................................................................................................................................................................................................42
14.2 GAS PRESSURE GOVERNOR .....................................................................................................................................................................................................42
14.3 CONVERSION TO LPG..................................................................................................................................................................................................................43
14.3.1 LBF81 –121 ....................................................................................................................................................................................................................43
14.3.2 LBF151 –401 ..................................................................................................................................................................................................................44
14.4 LPG COMMISSIONING AND TESTING ........................................................................................................................................................................................44
15.0 MAINTENANCE......................................................................................................................................................................................................................................45
15.1 GENERAL .......................................................................................................................................................................................................................................45
15.2 MAINTENANCE SCHEDULE .........................................................................................................................................................................................................45
15.3 DRAINING WATER HEATER SYSTEM ........................................................................................................................................................................................45
15.4 REMOVING SCALE AND SEDIMENT ...........................................................................................................................................................................................46
15.5 SACRIFICIAL MAGNESIUM ANODES ..........................................................................................................................................................................................46
15.5.1 ANODE REMOVAL LBF81/121 ......................................................................................................................................................................................46
15.5.2 ANODE REMOVAL LBF151/171 ....................................................................................................................................................................................47
15.5.3 ANODE REMOVAL LBF221 –401 .................................................................................................................................................................................47
15.6 REFILLING THE WATER HEATER ...............................................................................................................................................................................................48
15.7 BURNER REMOVAL AND CLEANING..........................................................................................................................................................................................48
15.7.1 LBF81 & LBF121 .............................................................................................................................................................................................................48
15.7.2 LBF151 –LBF401............................................................................................................................................................................................................48
15.8 OTHER CHECKS............................................................................................................................................................................................................................49
15.8.1 RELIEF VALVE................................................................................................................................................................................................................49
15.9 FLUE SYSTEM ...............................................................................................................................................................................................................................49
15.9.1 CORREX ELECTRICAL ANODE PROTECTION SYSTEM...........................................................................................................................................49
16.0 USER INSTRUCTIONS..........................................................................................................................................................................................................................49
17.0 WARRANTY ...........................................................................................................................................................................................................................................49

1.0 INTRODUCTION
The Lochinvar LBF range is a wall mounted or floor standing (dependent upon model) direct gas-fired high
efficiency water heater.
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.
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 12: 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:
Item Description Part Number
Unvented Water System Kit –LBF-81/121 WH11
Unvented Water System Kit –LBF-151/171 WH10
Unvented Water System Kit –LBF-221/301 WH15
Unvented Water System Kit –LBF-401 WH16
De-stratification Pump Kit WH9
Relay for Flame Failure/High Temperature Indication RLY2716
Correx Electrical Anode Protection –LBF-151/171 CKT9005
Correx Electrical Anode Protection –LBF-221/301/401 CKT9005
Flue System Components Refer to Section 8.0: FLUE SYSTEM
LPG Conversion Kit Refer to Section 13.0: LPG FUEL

2.0 PRINCIPAL PARTS
FIGURE 2.1 LBF81/121 PRINCIPAL PARTS
1
Flue hood cable
2
Storage vessel
3
Flue hood
4
Upper casing
5
Flue baffle
6
Hot outlet tube
7
Front casing
8
Gas inlet pipe
9
Control panel
10
Gas valve
11
Power connection PCB
12
Ignition sequence controller
13
Burner assembly
14
Lower casing
15
Side casing
TABLE 2.1 LBF81/121 PRINCIPAL PARTS

FIGURE 2.2 LBF151/171 PRINCIPAL PARTS
1
Fan assembly
12
Power connection PCB
2
Inspection door cover
13
Gas valve
3
Burner door gasket
14
Electrode grommets
4
Control panel
15
Burner door
5
Ignition electrode cable (white)
16
Gas pipe
6
Upper cover
17
Gas pipe gaskets
7
Flame sense electrode (red)
18
Burner assembly
8
Ignition sequence controller
19
Combustion chamber casing
9
Ignition sequence controller cable
20
Storage vessel
10
Power supply cable
21
Flue baffle
11
Lower cover
22
Flue hood
TABLE 2.2 LBF151/171 PRINCIPAL PARTS

8
FIGURE 2.3 LBF221 - 401 PRINCIPAL PARTS
1
Storage vessel
13
Outer jacket finish
2
Power connection PCB
14
Gas valve
3
Inspection door cover
15
Ignition sequence controller cable
4
Combustion chamber casing
16
Ignition sequence controller
5
Ignition electrode cable (white)
17
Lower cover
6
Burner door gasket
18
Power supply cable
7
Burner door
19
Upper cover
8
Electrode grommets
20
Control panel
9
Gas pipe
21
Flue Baffles
10
Gas pipe gaskets
22
Fan Assembly
11
Flame sense electrode cable (red)
23
Flue Hood
12
Burner assembly
TABLE 2.3 LBF221 –401 PRINCIPAL PARTS
A replacement parts list is available to download from Lochinvar’s website; please visit www.lochinvar.ltd.uk

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2.1 DIMENSIONAL DRAWINGS
FIGURE 2.4 DIMENSIONS LBF81/121
LBF81
LBF121
A
Overall Height Of Heater
1040
1400
B
Height without Flue Hood
850
1210
C
Width
450
450
D
Depth
460
460
E
Centre Line Of Flue Outlet
895
1255
F
Diameter Of Outer Flue
100
100
G
Diameter Of Inner Flue
60
60
H
Service Clearance From Front
500
500
I
Service Clearance From Above
200
200
J
Service Clearance From Sides
50
50
K
Service Clearance From Below
200
200
TABLE 2.4 DIMENSIONS LBF81/121
C
J
J
B
A
I
F
G
E
K
H
TOP VIEW
FRONT VIEW
LBF81/121
D

10
FIGURE 2.5 DIMENSIONS LBF151/171
FIGURE 2.6 DIMENSIONS LBF-221/301/401
LBF151
LBF171
LBF221
LBF301
LBF401
A
Overall Height
1905
2105
1560
1912
2275
B
Height Without Flue Hood
1680
1880
1335
1687
2035
C
Depth
520
520
720
720
720
D
Width
520
520
720
720
720
E
Center Line of Flue Outlet
1790
1990
1445
1795
2145
F
Cold Water Inlet
395
395
570
570
570
G
Hot Water Outlet
1625
1825
1285
1640
1985
H
Gas Supply
432
432
475
475
475
I
Inspection Flange
460
465
570
570
570
J
HWS Return
720
720
960
960
1135
K
Relief Valve Tapping
1470
1670
1485
1835
1835
L
Drain Valve
N/A
N/A
405
405
403
TABLE 2.5 DIMENSIONS LBF151/171/221/301/401
A
B
F
J
K
B
300
D
H I
A
L
F
J
K
G
E500
50
50
200
500
200
50
300
E
I
D
300
G
C
C
H
SIDE VIEW
RIGHT FRONT VIEW
TOP VIEW
TOP VIEW
FRONT VIEW
SIDE VIEW
RIGHT
A
B
F
J
K
B
300
D
H I
A
L
F
J
K
G
E500
50
50
200
500
200
50
300
E
I
D
300
G
C
C
H
SIDE VIEW
RIGHT FRONT VIEW
TOP VIEW
TOP VIEW
FRONT VIEW
SIDE VIEW
RIGHT

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3.0 TECHNICAL DATA
Model Number
LBF81
LBF121
LBF151
LBF171
LBF221
LBF301
LBF401
GENERAL DATA
Input (gross) –kW
5.6
5.6
20.0
21.1
27.8
32.2
32.2
Input (net) –kW
5.0
5.0
18.0
19.0
25.0
29.0
29.0
Recovery Rate (44° ΔT) – l/hr
88
88
314
325
474
535
520
Recovery Rate (50° ΔT) – l/hr
77
77
276
286
417
471
458
Heat generator seasonal efficiency –%
80.4
80.4
80.4
78.7
87.4
85.0
82.7
Weight (Empty) –kg
49
74
128
141
220
265
309
NOX(corrected to 0% O2) PPM
84
84
108
77
89
109
128
NOX(corrected to 0% O2) mg/KWh
148
148
190
136
157
192
225
GAS DATA-G20
Nominal gas inlet pressure-mbar
21
Maximum gas inlet pressure- mbar
25
Minimum gas inlet pressure-mbar
17.5
Burner pressure mbar
11
11
10.3
10.5
10.0
12.2
12.2
Injector Size mm
2.0
2.0
1.20
1.25
1.25
1.25
1.25
Gas flow rate- m3/hr
0.52
0.52
1.85
1.96
2.58
2.99
2.99
Gas Inlet connection size- “BSP
3/8
3/8
1/2
1/2
1/2
1/2
1/2
GAS DATA-G31
Nominal gas inlet pressure-mbar
37
Maximum gas inlet pressure- mbar
45
Minimum gas inlet pressure-mbar
30
Burner pressure mbar
28.0
28.0
28.0
28.0
28.0
28.0
28.0
Injector Size mm
1.15
1.15
0.70
0.70
0.65
0.72
0.75
Gas flow rate- m3/hr
0.39
0.39
0.75
0.79
1.05
1.21
1.21
Gas Inlet connection size- “BSP
3/8
3/8
1/2
1/2
1/2
1/2
1/2
WATER DATA
Storage capacity- litres
75
115
145
160
220
300
390
Water connections “BSP
½
½
¾
¾
1 ¼
1 ¼
1 ¼
System return connection - “BSP
N/A
N/A
¾
¾
1
1
1
Maximum water pressure (PMS) - bar
6
Maximum water temp- oC
74
FLUE DATA TYPE C12,C32 (concentric)
Nominal flue diameter-mm
38/60
38/60
60/100
60/100
60/100
60/100
60/100
Maximum flue gas temp- oC
99
88
109
95
109
115
97
Maximum equivalent length-m (Horizontal)
3.0
Maximum equivalent length-m (Vertical)
2.0
Equivalent length 90° bend –m
1.0
Equivalent length 45° bend –m
0.5
FLUE DATA TYPE C52 (twin-pipe)
Nominal flue diameter-mm
38/60
38/60
80/80
80/80
80/80
80/80
80/80
Maximum flue gas temp- oC
99
88
109
95
109
115
97
Maximum equivalent length-m (air duct)
6.0
Maximum equivalent length-m (exhaust)
6.0
Equivalent length 90° bend –m
1.0
Equivalent length 45° bend –m
0.5
TABLE 3.1 TECHNICAL DATA

12
4.0 GENERAL REQUIREMENTS
The Lochinvar LBF range 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 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 (2nd and 3rd family gases)
Part 2: Specification for installation and maintenance of ventilation for gas
appliances
BS 6700: 2006 Design, installation, testing and maintenance of services supplying water for
domestic use within buildings and their curtilages
BS 7074: 1989 Application, selection and installation of expansion vessels and ancillary equipment
Parts 1 and 2 for 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
Gas Safety (Installation and Use) Regulations 1998 (England, Scotland & Wales)
CIBSE: Guide parts A, B and C
H.S.E. guidance Automatically controlled steam and hot water boilers
Note PM5:
HSE Approved Code of Practice L8

13
Department of Health memorandum HTM 04-01
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.
When installing the Lochinvar LBF in hard water areas, it is recommended that a water treatment specialist be
consulted.
5.1 ELECTRICAL ANODE PROTECTION SYSTEM
The Lochinvar LBF151 - 401can be factory fitted with a Correx electrical anode protection system. The purpose
of this system is to protect the water tank from electrolytic attack by passing a small current from an electrode
immersed in the water to the internal surface of the vessel.
Whilst this system protects the unit from electrolytic attack, it should be noted that this is not a scale inhibiting or
reducing device.
When the protection system is working correctly, a green light should be visible on the control panel situated on
the front of the appliance. If an error occurs, this lamp will flash red. Remedial action should be taken as a matter
of urgency if such a situation arises.
It is a requirement of the Correx system that the unit is connected to a PERMANENT UNINTERRUPTIBLE
230V POWER SUPPLY. There must be no switches, including time controllers in the electrical system
other than the main isolator. Incorrect installation of the electrical supply will invalidate the warranty of
the appliance.
6.0 LOCATION
6.1 PLANT ROOM REQUIREMENTS
The Lochinvar LBF range may only be installed in a room that complies with the appropriate ventilation
requirements.
The Lochinvar LBF range can be used as a type C12, C32, C52 appliance. Due to its room sealed design,
ventilation allowances for combustion air are not necessary. If the appliance is to be installed in a compartment or
a hot environment, ventilation for cooling purposes must be fitted. For further guidance, please refer to Section 9:
AIR SUPPLY or to BS5440-2.
6.2 GENERAL REQUIREMENTS
Corrosion of the flue ways 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. 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, non-combustible 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 ventilation airflow.

14
6.3 CLEARANCES
The location chosen for the equipment must permit the provision of 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 Table 2.4 and 2.5for clearances. See Table 8.1 for details on flue terminal locations.
7.0 GAS SUPPLY
The Lochinvar LBF 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 13: 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
13: 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.
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.
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.

15
8.0 FLUE HOOD ASSEMBLY LBF151 - LBF401
8.1 UNPACKING THE FLUE HOOD
The flue hood is delivered with the water heater in a separate box that contains:
A. Flue hood casing in black painted aluminium
B. fan assembly
C. Ø 60/100 Transition piece with flue sampling point,
Plastic bag with fixing screws
8.2 FLUE HOOD INSTALLATION
Place the fan assembly on the top of the water heater, pointing the Ø 60 flue outlet in the desired direction

16
Fix the fan in position with the screws contained in the box.
Fix the bracket with the hole for cables vertically.

17
Feed the air pressure switch hoses through the bracket.
Connect the motor supply cable, pos. 2 and 3. Connect the earth cable, pos. 1

18
Connect the two tubes to the pressure points.
IMPORTANT:
Pink tube pressure point 1 (the metal one)
Clear tube pressure point 2 (the plastic one)
Place the black flue hood casing on the heater.

19
Centre the Flue hood casing by means of the 4 spacers on the top of the heater:
Connect the Transition piece with sampling point

20
Fix the black flue hood casing to the heater using the screws supplied in the box.