page no. 17 of 48
LNVx Range Users, Installation & Servicing Instructions Doc Ref M104 issue 1.0 Sep 2018.
Type B
22
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 C
32
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.
LNVx
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
15.5
31.0
62.0
31.0
155.0
77.5
n/a
155.0
155.0
77.5
77.5
20
20.5
41.0
82.0
41.0
205.0
102.5
n/a
205.0
205.0
102.5
102.5
25
26.0
52.0
104.0
52.0
260.0
130.0
n/a
260.0
260.0
130.0
130.0
35
36.5
73.0
146.0
73.0
365.0
182.5
n/a
365.0
365.0
182.5
182.5
40
40.5
81.0
162.0
81.0
405.0
202.5
n/a
405.0
405.0
202.5
202.5
45
47.0
94.0
188.0
94.0
470.0
235.0
n/a
470.0
470.0
235.0
235.0
50
54.5
109.0
218.0
109.0
545.0
272.5
n/a
545.0
545.0
272.5
272.5
60
65.0
130.0
260.0
130.0
650.0
325.0
n/a
650.0
650.0
325.0
325.0
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
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 LNVx 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 LNVx 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
.