32
9.2
COOLING VENTILATION
When used as a type C appliance, installed in a compartment or an enclosure, cooling ventilation should be provided as follows:
Model
Input
(Gross)
kW
Input
(Net)
kW
Enclosure/Compartment
Enclosure/Compartment
Boiler Room
(Direct to Outside)
(To Internal Space)
High
(cm
2
)
Low
(cm
2
)
High
(cm
2
)
Low
(cm
2
)
High
(cm
2
)
Low
(cm
2
)
CP-M+60
62.2
56.0
280
280
560
560
N/A
N/A
CP-M+80
82.2
74.0
370
370
740
740
148
148
CP-M+100
102.2
92.0
460
460
920
920
184
184
CP-M+120
123.3
111.0
555
555
1110
1110
222
222
CP-M+150
153.3
138.0
690
690
1380
1380
276
276
CP-M+180
184.3
166.0
830
830
1660
1660
332
332
TABLE 9.3
COOLING VENTILATION REQUIREMENTS
When used as a type B appliance, provision for cooling ventilation is included in the combustion ventilation allowance.
9.3
MECHANICAL VENTILATION
In situations where combustion air cannot be provided by the means of ventilation grilles, it can be supplied by a fan. The
minimum flow rate for the fan should be in accordance with
Table 9.4
.
If required, extract air can also be through the use of a fan. When sizing the extract fan, the extract flow rate should be calculated
by subtracting the difference volume (from
Table 9.4
) from the actual supplied volume of inlet air. If therefore, a larger than
required inlet volume is provided, the extract flow rate will need to be increased accordingly.
If the ventilation discharge from the plant room is through the means of simple openings relying on thermal effects, the minimum
free areas of the openings and any associated grilles should be as specified for natural ventilation (see
Section 9.1:
COMBUSTION VENTILATION
). The ventilation openings shall be at high level and the air supply shall be at low level.
NOTE: VENTILATION MUST NOT BE PROVIDED THROUGH NATURAL INLET AND MECHANICAL EXTRACT AS THIS
WILL CAUSE A NEGATIVE PRESSURE WITHIN THE PLANT ROOM AND MAY LEAD TO THE PRODUCTS OF
COMBUSTION BEING DRAWN INTO THE PLANT ROOM.
Appliance Type
Flow rate per kW total rated net input
(m
3
/h)
Minimum Inlet Air
(Combustion, Ventilation)
Difference between Inlet and Extract
Air
(Inlet minus Extract Ventilation)
Without draught diverters.
(with or without draught stabilisers)
2.60
1.35 ± 0.18
TABLE 9.4
MECHANICAL VENTILATION FLOW RATES
9.3.1
WORKED EXAMPLE – MECHANICAL INLET/NATURAL DISCHARGE
Lochinvar CP-M+100
Heat input (net):
=
92.0 kW
Minimum combustion air flow rate:
=
92.0 x 2.6 m
3
/h
=
239.2 m
3
/h
Ventilation grille size (high level):
=
184 cm
2
Summary of Contents for CP-M Series
Page 5: ...5 2 0 PRINCIPAL PARTS FIGURE 2 1 REMOVABLE COMPONENTS CP M 60...
Page 6: ...6 FIGURE 2 2 REMOVABLE COMPONENTS CP M 60 CONTINUED...
Page 8: ...8 FIGURE 2 3 REMOVABLE COMPONENTS CP M 80 CP M 100...
Page 9: ...9 FIGURE 2 4 REMOVABLE COMPONENTS CP M 80 CP M 100 CONTINUED...
Page 11: ...11 FIGURE 2 5 REMOVABLE COMPONENTS CP M 120...
Page 12: ...12 FIGURE 2 6 REMOVABLE COMPONENTS CP M 120 CONTINUED...
Page 14: ...14 FIGURE 2 7 REMOVABLE COMPONENTS CP M 150 CP M 180...
Page 15: ...15 FIGURE 2 8 REMOVABLE COMPONENTS CP M 150 CP M 180 CONTINUED...
Page 94: ...94...
