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7.0 Commissioning the Appliance
18
7.1
Commissioning the Appliance
1. Reference should be made to BS 5449 section 5
when commissioning the boiler and system.
2. Flush the whole system in accordance with
BS7593:1992. (See Treatment of Water Circulating
Systems section 3.2). Check the system for leaks.
3. Turn the gas service cock
1
/
4
turn from the off
position (Fig. 27). This will supply gas to the boiler
only. Purge the air from the gas service pipe in
accordance with BS 6891 and test for gas
soundness.
4. Turn the boiler thermostat to the off position
(Fig. 26).
5. Ensure that all external controls e.g. room stat,
timer etc are calling for heat and turn on the mains
electrical supply.
6. Slacken the test point sealing screw and connect
a pressure gauge (Fig. 26).
The pilot is intermittent and lights when the boiler
thermostat is calling for heat.
To operate the pilot turn the thermostat to HIGH.
The burner will also light shortly after the pilot has
been established.
The boiler is fitted with a series of diagnostic
indicator lights that indicate the status of the boiler.
Three of these are visible through the top of the
control box cover and two through the front of the
control box. Their sequence of operation is as
follows:-
a)
No power-no lights.
b)
Permanent live supplied-orange light illuminates.
c)
Permanent live & switched live supplied-second
orange light illuminates.
d)
Boiler thermostat turned on-third orange light
illuminates and spark generator operates.
e)
Pilot established-green light illuminates and power
supplied to main burner solenoid.
f)
Boiler fault-orange light illuminates and boiler goes to
lockout.
The pilot flame should be without a yellow tip and
be approximately 20mm long. No adjustment is
possible.
Operate the burner and allow the system to reach
normal operating temperature. Make further checks
for leaks and check the burner setting pressure,
adjusting if necessary.
This is done by removing the governor cover screw
(Fig. 28) and adjusting the governor in either
direction as required:- clockwise to increase,
anticlockwise to decrease (Fig. 29).
Remove the pressure gauge and tighten the
pressure test point sealing screw.
The boiler and system should be run and then
flushed and treated in accordance with BS5793:
1992 and the flushing agent/inhibitor
manufacturers instructions. When all the air has
been removed from the water circuit, the pump and
radiators should be balanced to achieve the design
temperature drop across the system.
Carefully read and complete all sections of the
“
Benchmark
”
Installation, Commissioning and
Service Record Log Book that are relevant to the
appliance and installation. The details of the Log
Book will be required in the event of any warranty
work. The Log Book must be handed to the user
for safe keeping and each subsequent regular
service visit recorded.
Governer Cover Screw
Adjust Governer
in either direction
Fig. 28
Fig. 29
Test Point
Sealing Screw
Viewing
Window
Boiler Thermostat
Knob
Green Pilot
Indicator Light
Off Position
Boiler Lockout
Light
Gas Cock
Fig. 25
Fig. 26
Fig. 27
