Glow-worm BBU 45/4 - Manual (Page 18)

18 2000225023C
6 Commissioning
6.1 Commissioning the Back Boiler
Before commissioning the back boiler, the whole of the system
should be thoroughly flushed out with cold water with the
circulation pump removed. Replace the pump, fill the system
and examine for water soundness. Vent air from the system and
pump.
The back boiler unit is fitted with a flue blockage safety device,
which will shut it down if there is a lack of oxygen. The principle
by which this operates is that when there is a depletion of
oxygen resulting from a build up of combustion products, the
flame on the pilot light will become unstable and lift up off the
sensing device, this will deactivate the gas valve via the p.c.b.,
cutting off the gas supply.
If the back boiler unit shuts down frequently for no apparent
reason the first things to be checked are the chimney and air
inlets into the room. Any problems found must be put right, by
a competent person, and a full operational test carried out
before the back boiler unit is used again.
The flue blockage safety device incorporates the electrode and
pilot assembly.
The flue blockage safety device MUST NOT be adjusted or
disconnected. It must be serviced strictly in accordance
with the instructions in this book. Any unauthorised
interference could result in the device failing to operate,
creating a potentially dangerous situation. If replacing,
use only the correct and approved parts.
CAUTION: The following work should be carried out by a
competent person.
Identify the back boiler controls by reference to diagram 6.1.
Open all windows and put out any naked lights, cigarettes etc.
Test the gas supply for soundness. Purge air in accordance with
the current issue of BS6891.
Check that the electrical supply to the back boiler is switched off.
Set the control thermistor knob “A” to “O” position, see diagram
6.1.
NOTE: Firelite 4, Contour 4, Miami 4, Heartbeat 4 and Black
Beauty 4 only.
Take care when handling the boiler user control so that the
extension lead is not strained.
continued -
Make sure the thermistor phial is fitted correctly, see diagram
5.4.
Loosen the back boiler burner pressure test screw “B” and
connect a suitable pressure gauge.
Turn gas service cock “C” to the “On” position making sure that
the fire front service cock “D” is in the “Off” position, restrictor
fully screwed in, see diagram 6.2.
Diagram 6.1
9396
CONTROL
BOX
CONTROL
THERMISTOR
KNOB “A”
PRESSURE TEST
POINT “B”
GAS
CONTROL
VALVE
GAS SERVICE
COCK “C”
ADJUSTER “G”
ELECTRICAL
PLUG
BOILER
USER
CONTROL