Adjusting Central Heating Output (Range Rating) - Vaillant TURBOmax VUW 242 E Instructions For Installation And Servicing

5.9 Adjusting the central
heating output
(range rating)
The TURBOmax is fully modulating for
central heating, and it is therefore not
necessary to range rate the central
heating. However, if desired, it is
possible to range rate the boiler, as
follows:
•
Remove screw (1, fig. 38) and
lower control panel.
•
Slacken the sealing screw and
attach one arm of a U gauge to
the burner pressure test point (1,
fig.37). Remove plastic sealing
plug and connect the other arm to
the combustion chamber sensing
tube (2, fig.37).
•
Remove screw (1, fig. 39) and
remove terminal box cover to
access the range rating
potentiometer (2, fig. 40) beneath.
•
Operate the central heating by
turning the central heating control
to the 'Heating and Hot Water'
position ( ) ensuring that the
external controls are calling for
heat and the maximum radiator
temperature control is set to 9.
•
The central heating output can now
be altered by inserting an
electricians screwdriver into the
potentiometer (2, fig. 40)
•
Turn the potentiometer fully
anticlockwise to the stop.
•
Slowly turn the potentiometer
clockwise, whilst observing the U
gauge.
•
Stop turning the potentiometer when
the burner pressure is at the correct
setting for the output required (see
table 5).
•
Turn the boiler off.
•
Remove U gauge. Tighten the
sealing screw, (1, fig. 36) and test
for soundness.
•
Refit plastic plug in chamber
sensing tube.
•
After setting, refit cover screw (1,
fig. 39) and re-secure control panel
(1, fig. 38).
26
Supplied By www.heating spares.co Tel. 0161 620 6677
fig. 38
T a b l e 5 : C e n t r a l
Output to
central Heating
mbar
28.0 (95,560)
24.0 (81,900)
21.0 (71,700)
18.0 (61,500)
15.0 (51,200)
12.0 (41,000)
min. 9,6 (32,800)
min. 11,2 (38,240)
fig. 39
fig. 40
H e a
Range rating mbar
VUW 242
-
10,0
8,0
6,1
4,5
3,1
2,0
-
VUW 282
10,6
8,0
6,3
4,8
3,4
2,2
-
2,0