Supplied By www.heating spares.co Tel. 0161 620 6677
36
GAS SUPPLY ADJUSTMENTS
(COMMISSIONING PART II)
Adjusting the central
heating output
(range rating)
The TURBOmax Pro is fully
modulating for central heating, and it
is therefore not necessary to range
rate the boiler. However, if desired, it
is possible to range rate the boiler, as
follows:
●
Connect the U-gauge to check
burner pressure (
1
and
2
).
●
Use Table G.2 on page 37 to
determine the central heating
output required.
●
Identify required range rating
setting and note main burner
pressure in mbar for that output.
●
Turn on the central heating.
●
Turn the central heating maximum
radiator temperature control to its
highest setting.
●
Ensure that any thermostatic
radiator valves are open and set to
high.
●
Wait for approx. 2 minutes until
the burner pressure switches to full
load.
●
The central heating output can now
be altered by inserting an
electricans screwdriver into the
potentiometer (
3
).
●
Turn the potentiometer fully
anticlockwise.
●
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.
●
Turn off the hot tap.
●
Remove U-gauge, tighten test point
sealing screw (
1
).
●
Reassemble the boiler.
●
Refit plastic plug in chamber
sensing tube.
●
Carry out all safety checks as
detailed in these instructions.
●
Record central heating operating
pressure in the Benchmark log
book along with the heat input
(kW) and temperature difference
between flow and return.
DO NOT open any hot water tap
whilst carrying out this procedure.
This illustration shows the U-tube pressure gauge connected to a system
configured to run on natural gas. When connecting the U-tube pressure
gauge to a system running on LPG, please refer to Fig. G.2 on page 35.
1
2
+
-
3
