Ambirad COBRA CB40 설치, 작동, 유지보수 및 서비스 매뉴얼 - 페이지 9

{카테고리_이름} Ambirad COBRA CB40에 대한 설치, 작동, 유지보수 및 서비스 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Ambirad COBRA CB40 19 페이지. Gas fired radiant tube heaters

페이지 인쇄

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