page no. 21 of 68
LX Range Users, Installation & Servicing Instructions Doc Ref M110 issue 1.0 Dec 2020.
1.3 General Requirements
• Mechanical Ventilation:
Must ensure that the space air change rate is at least
0.5/h, must be of the ‘input’ type and interlocked to
ensure the heaters cannot work if the input system is not
working.
Type B flued installations.
Where heaters are installed in a plant room or an
enclosure (i.e. not within the heated space) having
combustion air drawn directly from the room and
connected to a flue that evacuates the products of
combustion directly from the room additional provision
for natural or mechanical ventilation is required.
These being:
• Natural Ventilation:
There must be permanent air vents communicating
directly with the outside air, at high level and at low level.
Plant Rooms
Low level (inlet) 4cm²/kw of total rated net heat input
High level (outlet) 2cm²/kw of total rated net heat input
Enclosures
Low level (inlet) 10cm²/kw of total rated net heat input
High level (outlet) 5cm²/kw of total rated net heat input
• Mechanical Ventilation:
The minimum flow rate of ventilation shall be 4.14m³/h
per kilowatt of total rated heat input.
Type C flued installations.
Where heaters are Installed within the heated space (i.e.
not in a plant room or an enclosure) having combustion
air ducted to the appliance and combustion products
ducted to the outside air, NO additional provision for
the supply of either combustion air or for combustion
products dilution or additional provision for the supply of
air is necessary.
Type C flued installations.
Where LX heaters are installed in a plant room or an
enclosure (i.e. not within the heated space) having
combustion air ducted to the appliance and combustion
products ducted to the outside, air vents shall be
provided and be permanently open.
To room or internal space
Low level (inlet) 10cm²/kw of total rated net heat input
High level (outlet) 10cm²/kw of total rated net heat input.
Type B22 Installation (these refer to section 2.2 of
these instructions)
Air vents shall be permanently open.
In all cases figures are per heater installed.
For multi heater installations the appropriate
values for each heater must be added together
Type C12 or C32 Installation (these refer to section 2.2
of these instructions)
Air vents shall be permanently open.
Figures are for heaters in plant rooms or
enclosures ONLY
In all cases figures are per heater installed.
For multi heater installations the appropriate
values for each heater must be added together.
LX
Input
kW
In the
heated
space
In a plant room,
ventilation to
outside
In an enclosure,
ventilation to
outside
In the
heated
space
Ventilation is to a
room or internal
space
Ventilation is to a
outside air
Low level
grille.
Free area
cm²
Low level
grille.
Free area
cm²
High level
grille.
Free area
cm²
Low level
grille.
Free area
cm²
High level
grille.
Free area
cm²
Free area
grille cm²
Low level
grille.
Free area
cm²
High level
grille.
Free area
cm²
Low level
grille.
Free area
cm²
High level
grille.
Free area
cm²
15 16.2 32.4 64.8 32.4 162.0 81.0 n/a 162.0 162.0 81.0 81.0
20 22.2 44.4 88.8 44.4 222.0 111.0 n/a 222.0 222.0 111.0 111.0
25 17.4 34.8 69.6 34.8 174.0 87.0 n/a 174.0 174.0 87.0 87.0
30 32.1 64.2 128.4 64.2 321.0 160.5 n/a 321.0 321.0 160.5 160.5
35 35.8 71.6 143.2 71.6 358.0 179.0 n/a 358.0 358.0 179.0 179.0
40 43.1 86.2 172.4 86.2 431.0 215.5 n/a 431.0 431.0 215.5 215.5
50 53.6 107.2 214.4 107.2 536.0 256.0 n/a 536.0 536.0 256.0 256.0
60 64.2 128.4 256.8 128.4 642.0 321.0 n/a 642.0 642.0 321.0 321.0
70 75.3 150.6 301.2 150.6 753.0 376.5 n/a 753.0 753.0 376.5 376.5
90 94.9 189.8 379.6 189.8 949.0 474.5 n/a 949.0 949.0 474.5 474.5
120 127.0 254.0 508.0 254.0 1270.0 635.0 n/a 1270.0 1270.0 635.0 635.0
140 147.5 295.0 590.0 295.0 1475.0 737.5 n/a 1475.0 1475.0 737.5 737.5
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