20
10.2.5
EXPANSION VESSEL SIZING
The following information is based on a static head of 35 metres and a cold fill pressure of 3.8 bar:
V V =
0.45
S V * e
Where:
V V
=
Vessel Volume
S V
=
System Volume
e
=
Coefficient of Expansion
(See Table 10.1)
10.2.6
PRIMARY CIRCULATING PUMPS
The Lochinvar Mini Copper-Fin boiler may need a primary pump to ensure correct flow through the boiler and a
secondary pump to circulate water around the heating system. Pump selection must ensure that the flow rate
through the unit is in accordance with that stated in Table 10.4. The pump should be sited to facilitate servicing. It
is important that the existing pump size is checked when the boiler is being used for a refurbishment project, to
ensure that the minimum flow rate can be achieved.
Model
Differential - K
Flow – l/s
Total System Pressure
Loss - Metre H
2
0
MCB91CE
20
0.12
0.06
MCB136CE
20
0.20
0.06
MCB181CE
20
0.24
0.06
MCB226CE
20
0.36
0.09
MCB271CE
20
0.48
0.12
MCB316CE
20
0.58
0.12
MCB361CE
20
0.70
0.15
MCB401CE
20
0.85
0.40
MCB501CE
20
0.97
0.46
TABLE 10.4
SYSTEM HEAD LOSS
Primary circulating pumps are available as ancillary items; please contact Lochinvar Limited for details
FIGURE 10.1
BOILER PRIMARY/SECONDARY ARRANGEMENT
Summary of Contents for Mini Copper-Fin MCB136CE
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