Functional checks (Commissioning Part III) 8
Instructions for installation and servicing aquaPLUS VUI 362-7
33
8.4 Heating mode
• Activate the system and ensure the tank is fully
charged.
• Ensure that the heating system is calling for heat.
• Press the ”i“ key.
Status code “S.4” appears on the display to indicate
that heating is functioning correctly.
Fig. 8.4: Display indication during heating
8.5 Adjusting pump speed
The unit is fitted with a two-speed pump.
The pump is delivered with the switch (1) set to position
III.
Important note!
The boiler should only be operated at pump
setting III because the heating capacity for hot
water is reduced when operated at pump setting
II!
It is possible, however, to change the pump setting from
Level III to Level II manually when there is noise coming
from the heating system.
Fig. 8.5: Pump speed
8.6 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 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 in accordance with the
manufacturers instructions.
Further information can be obtained from Sentinel, Betz
Dearborn Ltd.,
Tel: 0151 4951861
or
Fernox, Alpha-Fry Technologies,
Tel: 0870 6015000.
Disconnect the temporary filling connection.
Refit the boiler casing.
Attach the bottom cover to the boiler by securing with
the two screws provided. It may be necessary to apapt
the bottom cover by removing the easy break sections.
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