page no. 25 of 68
CPx Range Users, Installation & Servicing Instructions Doc Ref M201 issue 2.9 Nov 2018.
Ideally the return pipe should terminate within the oil tank
at the same level as the suction line, both being below the
minimum oil level.
It is recommended that the fire valves should be installed
as follows:
1. Main storage to service tank supply (if applicable)
2. Main storage to burner supply
3. Service tank to burner supply (if applicable)
Fire valves should be installed generally in accordance
with the requirements of BS799: Part 5. The fire valve
should be situated in an easily accessible position as near
the tank as possible and where practicable within the
boundary of the tank chamber or catchpit retaining wall.
Type B flued installations.
Where CPx 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 CPx heaters are
installed in a plant room or
an enclosure (ie 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 B
23
Installation
(these refer to section 1.4.3 of these instructions)
Air vents shall be permanently open.
Figures in column 1 are for heaters installed in the space they are heating.
Figures in column 2 are for heaters installed in a plant room, ventilation to outside air.
Figures in column 3 are for heaters installed in a enclosures, ventilation to outside air.
In all cases figures are per heater installed.
For multi heaters installations the appropriate values for each heater must be added together.
CPx
Input
kW
In the heated
space
In a plant room, ventilation to
outside
In an enclosure, ventilation to
outside
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
30
32.29
64.6
129.2
64.6
322.9
161.5
45
48.97
97.9
195.9
97.9
489.7
244.8
60
64.62
129.2
258.5
129.2
646.2
323.1
90
98.31
196.6
393.2
196.6
983.1
491.5
120
127.43
254.9
509.7
254.9
1274.3
637.1
150
162.90
325.8
651.6
325.8
1629.0
814.5
175
190.07
380.1
760.3
380.1
1900.7
950.4
200
215.87
431.7
863.5
431.7
2158.7
1079.3
250
269.86
539.7
1079.4
539.7
2698.6
1349.3
300
316.25
632.5
1265.0
632.5
3162.5
1581.2
