34
10.3
SEALED SYSTEM ARRANGEMENT
If a sealed system arrangement is required, a suitable pressurisation unit is available from Lochinvar Limited on request. Sealed
systems should incorporate a safety valve with a lift pressure no greater than the maximum pressure rating of any component in
the heating system. The maximum working pressure of the boiler is 6.0 bar. A suitably sized expansion vessel should also be
fitted to the system in accordance with
BS4814
.
The appliance is fitted with a water pressure sensor and requires a nominal system pressure of 1.0 bar. The burner control will
block the boiler from operating if the system pressure drops below a pressure of 0.8 bar; once the system pressure rises above
1.0 bar, the block will be lifted. The maximum system pressure with the standard pressure sensor is 4.0 bar however, a pressure
switch may be used if the static head exceeds this. For further details on the connection of a water pressure switch, please refer
to
Section 11.0: ELECTRICAL SUPPLY
.
10.3.1
EXPANSION VESSEL SIZING
The following information is based on a static head of 3.5 bar. If a different cold fill pressure is to be used, please consult
BS4814.
V V = S V * e
0.45
Where:
V V
=
Vessel Volume
S V
=
System Volume
e
=
Coefficient of Expansion
(See
Table 10.1
)
Stored
Temp.
C
30
35
40
45
50
55
60
e
0.005
0.006
0.008
0.010
0.012
0.015
0.017
Stored
Temp.
C
65
70
75
80
82
85
90
e
0.020
0.023
0.026
0.030
0.031
0.033
0.037
TABLE 10.1
COEFFICIENT OF EXPANSION OF WATER AT 3.5 BAR COLD FILL PRESSURE
10.4
CIRCULATING PUMPS
The CP-M+ boiler has a built in circulating pump. This pump has a speed regulator which has been adjusted to the maximum
setting.
To prevent operational issues, this setting must not be altered
.
When there is a call for heat, the pump is energised, once the call for heat expires, the pump overruns for a period of 3 minutes.
The pump is also activated for one minute every 24 hours after the boiler power supply is connected in order to prevent the pump
seizing.
Содержание CP-M Series
Страница 5: ...5 2 0 PRINCIPAL PARTS FIGURE 2 1 REMOVABLE COMPONENTS CP M 60...
Страница 6: ...6 FIGURE 2 2 REMOVABLE COMPONENTS CP M 60 CONTINUED...
Страница 8: ...8 FIGURE 2 3 REMOVABLE COMPONENTS CP M 80 CP M 100...
Страница 9: ...9 FIGURE 2 4 REMOVABLE COMPONENTS CP M 80 CP M 100 CONTINUED...
Страница 11: ...11 FIGURE 2 5 REMOVABLE COMPONENTS CP M 120...
Страница 12: ...12 FIGURE 2 6 REMOVABLE COMPONENTS CP M 120 CONTINUED...
Страница 14: ...14 FIGURE 2 7 REMOVABLE COMPONENTS CP M 150 CP M 180...
Страница 15: ...15 FIGURE 2 8 REMOVABLE COMPONENTS CP M 150 CP M 180 CONTINUED...
Страница 94: ...94...
