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FUNCTIONAL CHECKS
(COMMISSIONING PART III)
Adjusting pump speed
The unit is fitted with a two-speed
pump.
The pump is delivered with the switch
(1) set to position II.
1
Important note:
The boiler should only be operated at
pump setting II because the heating
capacity for hot water is reduced
when operated at pump setting I!
It is possible, however, to change the
pump setting from Level II to Level I
manually when there is noise coming
from the heating system.
Final system flush („HOT")
Turn on the boiler for central heating
and allow the boiler and system to
reach operating temperature. Check
that the heating system is watertight.
Turn the boiler off and rapidly drain
both boiler and system while still hot:
Refill the system and release all air.
Release water from the system until
the system design pressure of 1.0 bar
Fig. F.4: Pump speed
is attained.
(The actual reading on the pressure
gauge should ideally be 0.5 bar plus
an additional pressure corresponding
to the highest point of the system
above the base of the boiler - 10 m
head equals an additional 1 bar
reading on the pressure gauge. The
minimum pressure should not be less
than 1 bar in any installation.)
If the system is to be treated with an
inhibitor it should be applied at this
stage. Sentinel X100 is suitable for
this purpose and it should be applied
in accordance with the manufacturers
instructions.
Further information can be obtained
from Sentinel, Betz Dearborn Ltd.,
Tel: 0151 4951861.
Disconnect the temporary filling
connection.
Refit the boiler casing
Attach the bottom cover to the boiler
by securing with the four screws
provided. It may be necessary to
apapt the bottom cover by removing
the easy break sections.
41
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