33
fig. 44
GW 438/0
5.13 Final system flush (`hot')
Allow the boiler and system to reach
maximum temperature and 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 as
described in Section 5.4. Release
water from the system until the system
design pressure of 1.2 bar is attained.
(The actual reading on the pressure
gauge - 12, fig. 36 - should ideally be
0.5 Bar plus an additional pressure
corresponding to the highest point of
the system above the base of the boi-
ler - 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 should be applied in
accordance with the manufacturers
instructions.
Further information can be obtained
from Sentinel, Grace Dearbom Ltd,
Tel: 0151 495 1861.
(The boiler does not utilise aluminium
in the water system and it is therefore
not necessary to use any special
inhibitors in the system.)
Disconnect the temporary filling
connection.
5.14 Fitting case
Attach top door panel by slotting side
clips (1, fig. 44) into holes in side
panel and sliding panel down to
secure.
Attach bottom door panel by locating
onto top hinge pin (4, fig. 45) and
inserting bottom hinge screw (3, fig.
45) down so that it also locates into
the door.
fig. 45
GW 459/0
5.15 Hand over to user
Set the maximum hot water tempera-
ture control to the required setting.
(For normal circumstances the maxi-
mum hot water temperature should be
set between 7 and 9. In hard water
areas the formation of scale in the hot
water system may be minimized by
not tuning the control above the ”
t
”
symbol).
Set the maximum radiator temperature
control to the required setting.
Note:
Operating the boiler at a lower
setting will increase fuel saving. How-
ever, if the setting is too low then the
radiators may not reach the desired
temperature. For maximum fuel saving
under normal circumstances the follo-
wing settings may be used as a guide:
Spring and Autumn
5 – 6
Winter (normal)
6 – 7
Winter (severe)
7 – 9
Instruct the user in the safe and effi-
cient operation of the boiler, in parti-
cular the function of:-
•
the boiler on / off control
•
the maximum radiator temperature
control
•
the maximum hot water temperature
control
•
the pressure gauge.
Advise the user that the boiler has an
internal frost protection thermostat,
and in very cold weather may there-
fore operate automatically to prevent
damage to itself.
Show the user how to operate any
external controls.
Explain to the user the importance of
having the boiler regularly serviced
annually by a qualified servicing com-
pany. To ensure regular servicing, it is
strongly recommended that arrange-
ments are made for a Maintenance
Agreement. Please contact Vaillant
Service Department (FREEPHONE
0800 318076) for further details.
Leave the user instructions in the pur-
pose provided pocket on the front of
the control panel (5, fig 46).
Leave the installation and service
instructions with the user.
