22
221657C
6 Commissioning
6.1 All Systems
Commissioning should be carried out by a competent person in
accordance with the current issue of BS6798.
Make sure that the system has been thoroughly flushed out with
cold water without the pump in place.
Refit the pump, fill the system with water, ensuring that all the
air is properly vented from the system and pump.
Before operating the boiler check that all external controls are
calling for heat.
6.2 Sealed Water Systems Only
Flush the whole system with cold water without the pump in
place. Refit the pump and fill until the pressure gauge registers
2.7bar (40lbf/in
2
). Clear any air locks and check for water
soundness.
Check the operation of the safety valve, by allowing the water
pressure to rise until the valve opens. The valve should open
/- 0.3bar (+/- 4.3lbf/in
2
) of the preset pressure. Where
this is not possible conduct a manual check and test.
Release cold water to initial system design pressure.
The set pointer on the pressure gauge should be set to coincide
with the indicating pointer.
6.3 Initial Lighting and Testing
CAUTION. This work must be carried out by a competent
person, in accordance with the current issue of BS6798.
Make sure that all naked lights and cigarettes are out.
Identify the controls by reference to diagram 6.1.
Check that the boiler is isolated from the electrical supply.
Makes sure that the control thermostat is turned to “O” the “Off”
position.
Turn the gas service cock “On”, see diagram 6.1.
Test the pilot supply tube and its connections for gas soundness
as follows:
Disconnect the ignition lead from the PCB, see diagram 5.9.
Remove the combustion chamber front, see diagram 6.3.
WARNING. The fan operates on mains voltage, terminals will
become live.
Turn the electrical supply on and check that all remote controls
are calling for heat.
Check that the pump is circulating water through the system.
To complete the test it is necessary to operate the boiler without
its case, but UNDER ALL OTHER CIRCUMSTANCES the case
must be correctly fitted and sealed.
Turn the control thermostat knob fully clockwise and the fan will
work.
Note. There will be no sparks at the pilot. Take care and light
the pilot with a match.
Test the pilot supply and connections for gas soundness, using
a suitable leak detection fluid.
Very cold weather may delay the operating sequence.
The pilot rate is preset and must not be adjusted.The step
adjustment screw must not be touched.
The pilot flame length should be as shown in diagram 6.4.
Turn the control thermostat knob to “O” and isolate the boiler
from the electrical supply.
Diagram 6.2
COVER
SCREW
MAIN
BURNER
PRESSURE
TEST POINT
NOTE: Do not adjust any
other setting screws
4085
4108
CONTROL
THERMOSTAT
KNOB
SETTING
POINT
Diagram 6.1
OVERHEAT
RESET
BUTTON
GAS SERVICE
COCK
(SHOWN OFF)
GAS
PRESSURE
ADJUSTMENT
SCREW
MULTIFUNCTIONAL
CONTROL
