Glow-worm Ultrapower sxi - Manual (Page 29)

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11 Commissioning
11.7 Range Rating
The boilers are 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 between 9 and
24kW in 1kW increments, refer to diagram 11.4, then:
a) Press and hold the ‘MODE’ button for 5 seconds.
The display will change to flashing ‘0’.
b) Use the ‘+’ or ‘-’ button to scroll to 96.
c) Press ‘MODE’ to confirm.
d) The display now shows a flashing ‘d. 0’. The part
load setting is displayed above in kW
e) Press ‘MODE’ to change, use the ‘+’ or ‘-’ button
to change this value to the desired setting.
h) Press ‘MODE’ to confirm, the new setting has been
saved.
i) Press and hold ‘MODE’ to exit.
NOTE: For approximate gas rates at part load, refer to table
opposite.
11.8 Water Systems
Check that all external controls are calling for heat, the boiler
will fire automatically. Fully open all radiator valves and the
flow control valve, if fitted, see diagram 4.1.
Balance the radiators as required and if fitted, adjust the flow
control valve to give the required system differential. Turn off
all radiators that can be shut off by the user and check to see
if less than the maximum differential allowed of 20 o C can be
achieved across flow and return.
The pump has two speeds and can be adjusted depending on
the requirements of the central heating system, see diagram
4.2.
The boiler has an inbuilt automatic adjustable bypass valve.
The pressure can be adjusted between approx 1.5 and
3.5mH
2
O but is factory pre-set to approx 2.5mH
2
O. The
pressure changes by approx 0.1mH
2
O for each full turn
of the bypass screw, see diagram 12.5. Turning clockwise
increases the pressure and turning anti-clockwise decreases
the pressure.
Allow the system to reach maximum temperature then switch
off the boiler by isolating from the electrical supply.
Lock or remove the flow control valve handle (if fitted).
Adjust the boiler temperature controls and any system
controls to their required settings.
We recommend that the domestic hot water should be run for
a short period until clear.
11.5 Re-pressurising System (if required)
1. Ensure that the filling loop flexible hose is securely
connected to the double check inlet valve, see diagram
11.3.
2. Fully open tap”A”, then gradually open tap “B” to fill the
heating system to a pressure of 1.0bar. When completed
close the filling taps.
3. Vent all air from the system - repeat step 2 as necessary
until the system is full and all the air has been removed.
4.
IMPORTANT: To comply with the water regulations the
flexible hose must be disconnected from the double check
inlet valve - undo the nut and pull the flexible hose from
the valve.
11.6 Gas Inlet Pressure and Gas Rate
The supply from the governed meter must be of adequate size
to provide a steady inlet working pressure of 20mbar (8in wg) at
the boiler. On completion, test the gas installation for tightness
using the pressure drop method and suitable leak detection
fluid, purge as necessary.
NOTE: Due to the modulating operation of the boiler and the
need to check the gas inlet pressure and measure the gas rate
at maximum rate, it will be necessary to force it to maximum.
Press the “reset” button on the controls fascia, release
and immediately press and hold in the “+” button. After
approximately 5 seconds “Hi” will be displayed. Pressing
the mode button when “Hi” is selected will force the boiler
to maximum rate, the display will flash between “Hi” and the
“default display” this will indicate the boiler has been forced to
maximum.
Operational Gas Inlet Pressure
With ALL other gas appliances operating, check the operational
supply pressure at the gas service isolation valve test point, see
diagram 11.1.
The nominal supply pressure for Natural Gas (G20) is 20mbar.
The nominal supply pressure for LPG (G31) is 37mbar.
Turn the taps and appliances off, then disconnect the pressure
gauge.
NOTE: If you require to measure the gas inlet pressure at the
gas valve there will be a pressure drop over the gas service
isolation valve, this is normal and the inlet pressure can be up
to 2mbar less.
Additionally the safe nominal maximum heat input of the
appliance can be achieved at an inlet pressure down to 15mbar.
NOTE: The BURNER PRESSURE cannot be measured.
Gas Rate
Make sure that ALL other gas burning appliances and pilot
lights are off.
Check the gas rate using the gas meter test dial and stop
watch, at least 10 minutes after the burner has lit, see table
opposite for approximate rates.
In communal or LPG installations where the gas rate cannot be
measured it is acceptable to measure the combustion rate as
described in the servicing section.
On completion, press the “mode” and “+” buttons
simultaneously, this will reset the boiler.
kW m3/hr ft3/hr kW m3/hr ft3/hr
24 2.5 88.6 16 1.7 58.9
23 2.4 84.7 15 1.6 55.4
22 2.3 81.2 14 1.5 51.5
21 2.2 77.3 13 1.4 48.0
20 2.1 73.8 12 1.3 44.1
19 1.1 69.9 11 1.2 40.6
18 1.9 66.4 10 1.0 36.7
17 1.8 62.9 9 0.9 33.2