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COMMISSIONING
The commissioning and first firing of the boiler must
only be done by a competent person.
Gas installation
It is recommended that any air is purged from the
supply at the gas inlet test point on the lower right
hand side of the gas valve, see diagram 15.
Filling the system
• Open shut off valves, see diagram 5 (slot of screw
corresponds to flow direction), and caps on auto-
matic air vents on top of pump and top right hand
side of boiler.
• Bleed each radiator until a continuos jet of wa-
ter is obtained.
• Do not close automatic air vent caps on boiler.
• Open various hot water taps to bleed system.
• Make sure that pressure gauge reads between
1 and 2 bar. Re-pressurise system as necessary.
Important:
- If this procedure is not carried out properly, the
boiler will go into safety lock-out until all of the air
has been purged.
- When venting air from boiler, do not touch the
schrader valve on the expansion vessel, it is NOT a
vent.
Starting the boiler
Before starting the boiler check that:
- The gas meter tap is open.
- The boiler gas service cock is open.
- The boiler is connected to the electrical supply.
First starting up
• Following the instructions given in the 'Controls
and Lighting' section, set boiler to run in central
heating mode.
• Set boiler thermostat for maximum temperature
and check that any external controls, if fitted, are
calling for heat.
• Allow the temperature to rise to the maximum
value, with all radiator valves open.
The temperature rise will cause release of the gases
contained in the water of central heating system.
- Gases driven towards the boiler will be automati-
cally released through the automatic air vents.
- The gases trapped at the highest point of the sys-
tem must be released by bleeding the radiators.
On reaching maximum temperature, the boiler
should be turned off and the system drained as
rapidly as possible whilst still hot.
• Refill system to a pressure of 1 bar and vent as
before.
• Restart boiler and operate until a maximum tem-
perature is reached. Shut down boiler and vent
heating system. If necessary, top up heating sys-
tem and make sure that a pressure of 1 bar is indi-
cated on the pressure gauge when system is COLD.
Gas pressures
The main burner pressure should be checked dur-
ing commissioning to make sure the correct input
is obtained. Proceed as follows:
• Shut down boiler.
Diagram 15
Gas inlet
test point
Diagram 16
Connect the pressure gauge to MP and
RMP
MP = measuring point
RMP = reference measuring point
• Undo screws on burner pressure test points RMP
and MP below sealed combustion chamber, see
diagram 16.
• Connect a suitable pressure gauge.
• Gain access to the rear of the control panel and
locate the range rating adjuster screw, see dia-
gram 17.
• Start boiler as described in 'Instruction for Use'.
• Set OFF/Summer/Winter switch to 'Winter' (Heat-
ing and hot water ) position.
pressure gauge
13
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