Starting The Appliance; Commissioning; Checking The Gas Inlet Pressure - Worcester GREENSTAR 24i Junior Installation, Commissioning And Servicing Instructions

COMMISSIONING

5.4

STARTING THE APPLIANCE

CAUTION: RUNNING THE APPLIANCE
▶ Never run the appliance when the appliance/system is
empty or partially filled.
1 2 3
4
Fig. 65 Control panel
1 Central heating temperature
control
2 Burner indicator (Green)
3 Service button
4 Cover or optional Programmer 8 DHW temperature control
9 System pressure gauge
Switching the appliance on/off:
▶ Turn on mains power, the power on indicator (5) illuminates BLUE.
▶ Turn on any external controls
▶ Set the thermostatic radiator controls to maximum temperature
▶ Set the clock/programmer to continuously ON and the room
thermostat to maximum temperature
Turn the boiler CH temperature control (1) to maximum. The burner on
indicator (2) illuminates GREEN when the burner has lit.
If the boiler fails to light, the BLUE power indicator (5) and reset button
(7) will flash.
NOTICE: RESET
▶ Do not press the blue power indicator to reset the
boiler.
To reset press and hold the reset button (7) for more than two seconds.
The boiler will be reset.
5.5 COMMISSIONING
NOTICE: The combustion settings on this gas-fired
boiler have been checked, adjusted and preset at the
factory for operation on the gas type defined on the data
plate.
No measurement of the combustion values are
necessary provided there is a meter installed allowing
the gas rate to be checked.
DO NOT ADJUST THE AIR/GAS RATIO VALVE.
When running in the service mode, the boiler will operate
both the central heating and the domestic hot water
circuits. This is to allow sufficient time for this part of the
commissioning procedure. It will be necessary to run
water through the domestic hot water circuit to ensure
that the boiler will not cycle on low heating demands.
32
5
6 7 8 9
6720643895-52.2Wo
5 Power ON and fault indicator
(Blue)
6 ECO button
7 Reset button
Having checked:
▶ That the boiler has been installed in accordance with the installation
instructions.
▶ The integrity of the flue system and flue seals, as described in
section 6.3 of this manual.
▶ The integrity of the boiler combustion circuit and relevant seals.

5.5.1 CHECKING THE GAS INLET PRESSURE

The inlet pressure to the appliance must be checked using the following
procedure:
MEASURING THE INLET PRESSURE
1
Fig. 66 Inlet pressure test point
▶ Close gas isolation valve.
▶ Slacken the screw in the inlet pressure test point (1) and connect a
manometer.
▶ Open gas isolation valve.
▶ Measure the pressure with the boiler running at maximum.
– Press service button for more than ten seconds and set Central
Heating temperature to maximum.
– The service button will lit continually and the blue power indicator
will pulse five times, quickly.
▶ Check the gas supply working pressure at the gas valve inlet point is
no less than the values shown in figures 67 or 68.
Ensure inlet pressure is satisfactory with all other gas
appliances working.
GAS PRESSURE WITHIN THE SYSTEM
The boiler must be running at maximum output rate
when performing the gas rate check.
Refer to the figures below for natural gas or L.P.G gas pressures.
The pressure at the boiler must not be less than the pressure read at the
meter minus:
• 1 mbar for Natural Gas
• 2.5 mbar for L.P.G.
The pressure drop from the meter to the gas valve must not be more
than:
• 2.5 mbar for Natural Gas
• 4 mbar for L.P.G.
If the pressure drops are greater than shown below, then this would
indicate a problem with the pipe work or connections within the system.
6 720 802 047 (2013/05)