Ambirad COBRA CB40 Скачать руководство пользователя страница 9

7

10 Access to the burner gas/

flue/electrical connection

To gain access remove the six bolts 
securing the two sections of the ball
guard to the heater and remove.

Figure 6  

11 Fresh air ducted inlet 

(all models)

When the Cobra heater is to be installed in
locations where there is airborne dust or
where there is a polluted atmosphere e.g.
chlorinated vapours, process dust etc., a
ducted fresh air supply must be provided
to the burner.

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
fixed with hose clips to facilitate 
disconnection when servicing the burner.

The maximum length of fresh air inlet
duct is 7m 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. 

12Commissioning for 

individually flued and 
unflued heaters

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.

Remove the ball guard to heater 
(section 10) slacken screw securing burner
box access cover.  (See figure 7)

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
off the power supply to the heater, wait 5
seconds then restore it.  If repeated lock
out occurs investigate cause.  (See Fault
Finder section 16).

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.

Unscrew the fixing screw in the housing
lid and remove. Remove pressure test
point screw nearest the burner head and
connect a ‘U’ tube manometer to the 
pressure test nipple located on the body of
the gas valves. Remove the slotted cover
from the pressure test regulator revelaing
the adjustable screw. Replace mains input
connector and start the heater.

Figure 7  

Using a suitable screwdriver adjust and
slacken the securing screws to hinge
burner access cover.

Figure 8

Содержание COBRA CB40

Страница 1: ...Operation maintenance and servicing manual CB40 GAS FIRED RADIANT TUBE HEATERS COBRA...

Страница 2: ...s 8 Installation of Cobra heaters 9 Flue connection 10 Access to the burner gas flue electrical connection 11 Fresh air ducted inlet all models 12 Commissioning for individually flued and unflued heat...

Страница 3: ...addition the installation must be carried out in accordance with the current IEE 1992 BS 7671 BS 6896 1991 Industrial Commercial and any other relevant British Standards and Codes of Practice A gas m...

Страница 4: ...mmended by the institute of Gas Engineers the manufacturer and Ambi Rad Ltd These instructions must becarried out inaccordance withthe relevant provisions of the gas safety installation and use regula...

Страница 5: ...if required manual control switches and a frost thermostat Circuits and controls All such controls and switchgear must be rated to handle the total inductive load of the circuit they control Load per...

Страница 6: ...e case of drop rods a closed formed hook The hanging attachments to overhead steelwork etc must be purpose made to good sound engineering practice or of a proprietary type fixing They must be adequate...

Страница 7: ...onstruction Alternatively 10mm diameter mild steel drop rods can be used Figure 4 Mounting of Cobra heater Wall mounting brackets must support the heater at an angle of inclination between 30 and 45 a...

Страница 8: ...s an optional extra by the manufacturer must be fitted to the flue exit this kit connects from the flue outlet to a 5 adaptor The flue fitting is designed to accept either 5 single wall or 5 twin wall...

Страница 9: ...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 ig...

Страница 10: ...e section 10 Figure 10 Replace mains input connector and start the heater Using a suitable screwdriver adjust the pressure regulator if necessary set pressure as stated on data label Switch off the he...

Страница 11: ...emove the combustion fan disconnect the electrical connection from the burner control assembly and remove the fan securing screws to the side of the burner box Figure 14 Figure 15 Remove fan spigot by...

Страница 12: ...the product it is now possible to replace components as follows Injector Figure 18 Remove the four screws securing the burner spigot to the burner box Lift off the burner assembly and gasket checking...

Страница 13: ...eed as follows Figure 23 Figure 24 Disconnect gas fittings disconnect wiring harness from valve Remove rear panel of burner box Remove the two screws securing the gas valve to the panel and two screws...

Страница 14: ...ections Vacuum switch Figure 26 Disconnect the two silicon rubber tubes and the electrical connectors Noting correct orientation Figure 27 Remove the two screws securing the vacuum switch in position...

Страница 15: ...sure 2 Burner nozzle pressure 3 Check live and neutral polarity and a good earth is present Check 1 Check vacuum switch tubes 2 Check emitter tubes air inlet and the flue is not obstructed 3 Check ope...

Страница 16: ...ner head wiring assembly 900225 3 pin mains socket 2135 5 3 pin fan socket 3123 5 Silicone tube 2198 Fan air inlet 201125 Burner orifice plate 201063 08 Injector 201007 24 Vacuum switch 201013 17 Spar...

Страница 17: ...flue pipe 5 46 1 75 6 06 2 He 2 50 6 22 Note 1m of actual flue with two 90 bends gives the minimum equivalent flue height of 0 25m for 100mm diameter flue and 0 62m for 125mm diameter flue The maximu...

Страница 18: ...s again switch off heater and call out a service engineer Note U bend will glow but this is acceptable To switch off Cobra heater 1 Switch off electrical supply to the heater The burner will shut off...

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