6
®
c) Gas part assembly and air tube should be fastened by the mounting ring thread joint. Ensure that the ring
gasket is correctly fitted in the gas head seat (see Fig. 4).
d) The complete pilot (air tube) can be inserted into the mounting tube. In order to make the air tube slide-in
easier, apply a small amount of high temperature resistant grease.
e) The insertion depth of
SP-48-FD
pilot is determined by the design of the main burner. If an existing pilot
has to be replaced, the insertion length and pilot tip position should be the same. In case of any doubts, the
position of the pilot should be consulted with the pilot and burner manufacturer.
f)
After determining the position of the complete pilot relative to the mounting tube, the mounting tube
clamping screws should be tightened to prevent the device from moving.
FIGURE 4.
Gas head with ring gasket and swirler-stabilizer assembly with bleed and main gas orifices
7.3 GAS AND AIR SUPPLY INSTALLATION
a) The pilot must be set in the mounting tube such that the air and gas connections are in the desired
positions.
b) Connect the air and gas hoses to the appropriate pilot inputs. Hoses cannot be tangled or twisted.
If necessary, additional connectors may be used.
c) To ensure a long and trouble-free operation of the pilot it should be kept clean. Check the condition of the
gas pipe and if the orifices are not blocked. Remove all buildups. Hoses should be dry and not cracked.
d) During maintenance or service works, secure the disconnected ends of the hoses by closing the ends with
a plug or a tape.
e) Use the automatic shutoff valves of the
appropriate size and the respective closing rate and pilot gas pressure
measurement with safety interlocks (compliant with the requirements of relevant standards concerning the
shut-off safety fuel valves and burner safety) to be sure that the gas delivered to the pilot is of an adequate
pressure and can be quickly and
effectively shut off.
f) Use manual shut-off valves on air and gas lines for each pilot in case of maintenance or replacement and
for adjustment of pressure and flow on each pilot separately.
REMARK
: AT THE DESIGN STAGE DETERMINE LENGTH OF CABLES AND
FLEXIBLE AIR AND GAS CONNECTIONS TO ACCOMMODATE ANY EXPECTED
HEATER OR BOILER CONSTRUCTION MOVEMENT
7.4 CABLING
Wiring and electrical connections design and layout should be in accordance with the requirements for burner
installation devices specified in their instructions and the relevant regulations.
Ring gasket
HTI rod tip
Bracket
Gas divider with main orifice
Main orifice gas tube
Bleed gas orifice
Swirler- stabilizer plate
