Ambirad VISION COMPACT VC12 Manuel d'utilisation, de maintenance et d'entretien - Page 9

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11 Fresh air ducted inlet (all

models)

When the Vision Compact heater is to be

installed in locations where there is airborne

dust or where there is a polluted atmos-

phere e.g. chlorinated vapours, process dust

etc., a ducted fresh air supply must be pro-

vided to the burner. Where a fresh air duct-

ed inlet is to be fitted to the burner assem-

bly the aluminised steel air intake grill must

be removed from the burner casing and the

D/A fitting attached over the burner orifice

plate.

These models incorporate a 100mm (4in)

fresh air duct connection (Pt. No.

M201601-SUB). A fresh air duct of

minimum 100mm (4in) diameter should be

connected to the D/A duct. A flexible joining

piece should be used, available from the

manufacturer (Pt. No. 7531), fixed with hose

clips to facilitate disconnection when

servicing the burner.

The maximum length of fresh air inlet duct

is 7 m of 100mm (4in) diameter duct, the

maximum number of bends is two. The fresh

air inlet duct can be installed either

vertically or horizontally. A position should

be selected for the inlet of the fresh air duct

so that it will receive dust free clean air. A

cowl of the British Gas tested and certified

type, such as the GCI or GLC terminal,

should be fitted at the inlet of the duct. If

the duct inlet is located on a roof the

underside of the inlet cowl must be at least

600mm (2ft) above roof level and at least

250mm (10in) higher than any projection on

the roof within a 2m radius of the cowl.

12 Commissioning for

individually flued and unflued

heaters

Figure 5

Inspect installation and ensure that it has

been carried out in accordance with these

instructions. Ensure that electrical and gas

supplies are isolated. The gas supply should

be purged and tested for soundness in

accordance with the BS6891:1988, BGIM/16,

IGE Report 1M/2 and any other British

Standard and Codes of Practice. Open

isolating valve.

Figure 6

Remove the combustion chamber cover

plate by unscrewing 6 fixing screws. Take

care not to damage the sealing gasket.

Open the control housing cover by

unscrewing the securing screws. Ensure all

internal components are securely fixed and

all connections securely made.

Switch on the electrical supply to the heater

and observe the correct start up sequence as

follows:

The mains lamp (red) will illuminate. The ID

fan will start to run and the vacuum switch

checking relay (inside flame electronic

sequence control box) will pull in. Safe start

checks are carried out automatically and a

purge period of approximately 9 seconds will

commence.

At the end of the purge period the ignition

sequence will commence. The spark ignition

will be energised producing a spark at the

ignition electrode. The gas shut off valve

will at the same time be energised. If

ignition is successful the flame is detected

by the flame sensing probe and the ignition

spark will be switched off. The 'burner on'

(amber) lamp indicates that the gas safety

control valves are energised.

If the ignition is unsuccessful the gas safety

control valve is closed and the spark ignition

de-energised after approximately 5 - 7

seconds.

After an unsuccessful ignition attempt the

electronic sequence controller will 'lock out' .

The 'power lamp' (red) only will remain

illuminated and the fan will continue to run.

To reset this 'lock out' condition, switch the

power supply to the heater, wait 5 seconds

then restore it. If repeated lock out occurs

investigate cause.

In the event of an electrical fault after

installation of the appliance preliminary

electrical systems checks should be carried

out (re earth continuity polarity and

resistance to earth).

To shut down the heater, switch off the

power supply to the heater. Automatic

control of the heater or a series of heaters

may be achieved by incorporating

thermostats, time switches, frost

thermostats, manual over-ride switches etc,

in the electrical supply to the heater(s). It is

essential to allow a delay of 15 seconds

after switching off a heater before

attempting to restart.

If at any time after completion of the start

up sequences, loss of flame should occur,

the electronic sequence controller will

attempt to re-ignite. If this is unsuccessful

lock out will occur.

Set burner gas pressure as follows:

Isolate gas supply. Unplug mains input

connector to heater.

Figure 7