page no. 12 of 40
VPx Range Users, Installation & Servicing Instructions Doc Ref M205 issue 1.2 Nov 2018.
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 C
12 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.
VPx
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
35 36.5 73.0 146.0 73.0 365.0 182.5 n/a 365.0 365.0 182.5 182.5
50 54.5 109.0 218.0 109.0 545.0 272.5 n/a 545.0 545.0 272.5 272.5
70 76.5 153.0 306.0 153.0 765.0 382.5 n/a 765.0 765.0 382.5 382.5
90 97.5 195.0 390.0 195.0 975.0 487.5 n/a 975.0
975.0 487.5 487.5
120 127.0 254.0 508.0 254.0 1270.0 635.0 n/a 1270.0 1270.0 635.0 635.0
140 146.0 292.0 584.0 292.0 1460.0 730.0 n/a 1460.0 1460.0 730.0 730.0
1.3.6 Ventilation Requirements
Type B flued installations.
Where VPx heaters are installed within the heated space
(ie not in a plant room or an enclosure) and having a
building design air change rate of greater than 0.5/h,
additional provision for ventilation is not required.
If the building design air change rate is less than 0.5/h,
additional provision for natural or mechanical ventilation
is required. These being:
• Natural Ventilation:
Grilles having a free area of at least 2cm² per kW of rated
heat input shall be provided at low level i.e. below the level
of the heater flue connection.
• 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 VPx 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 VPx 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 VPx 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
• Direct to outside air
Low level (inlet) 5cm²/kw of total rated net heat input
High level (outlet) 5cm²/kw of total rated net heat input.
1.3 General Requirements
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