78
Preoperational Checks
Functional Flow
Gas Start-up
Preoperational checks
Check the following prior to the initial
operation of the boiler system:
• Take care to observe the operating
instructions supplied by the boiler
manufacturer.
• Check the complete system for correct
wiring of all of its items inclusive of the
valves and instruments.
• Check the air fan motor for correct
direction of rotation.
• Check for the proper setting of the
temperature and pressure controllers,
limiters and safety switches.
• Check for adequate fuel supply, suf-
ficient gas connection pressure, and
sufficient oil contained in tank.
• Make a leak test of the fuel-carrying
lines (ensure no air is contained).
• Check that the exhaust gas ports are
opened and fresh air is supplied at the
required rate.
• Make sure the burner is in starting
position.
• Check that automatic furnace control-
ler is unlocked.
A leak test should be made with the
complete gas valves and instruments
group using the 1.1-fold operating pres-
sure but minimum 60 mbar above the
operating pressure level. Joints like
flanges, screwed unions, etc. must be
sprayed with foaming agents and chek-
ked for absence of leaks. Take care to
observe the maximum operating pres-
sure of the valves and instruments.
After the temperature has been allowed
to equalize make sure the test pressure
does not drop for the subsequent test
period of 10 minutes.
Gas line venting:
The gas line and valves/instruments
must be vented before taking the burner
into operation. If an inflammable gas
mixture is detected make sure to
discharge it into the open atmosphere
through a vent line and make a check
with a test burner in the outlet area of
the burner.
Functional test without fuel
Check the burner for proper functional
order without using a fuel. In gas opera-
ting mode make sure to close the gas
stop valve. In oil operating mode the
test is made with closed stop valve in
the feed line to the burner.
Start-up
For taking the duoblock burner type
RPD into operation, it will be required to
carefully adjust the burner system by
duly following the adjusting instructions
and procedures. After the burner and
boiler have been tested in the way des-
cribed above, the burner may be taken
into operation.
Gas start-up
• Set the emergency and main switches
to their „ON“ positions.
• Open the ball stop valve upstream of
the gas valve and check the gas pres-
sure on the pressure gauge mounted
upstream of the gas pressure control-
ler.
• Set the fuel selector switch to its „Gas“
position.
• Set the control switch to its position
„1“.
• Set the output selector switch to its
position „0“ = Partial Load or „1“ =
Regulating Load, as required. For
adjusting the burner make sure the
switch is in its „Regulating Load“ posi-
tion.
• Set the service switch also to its posi-
tion „1“.
• The „Manual-Automatic“ selector
switch is in its „Automatic“ position
during start-up and operation.
• When adjusting the burner be sure the
switch is changed over to its „Manual“
position.
• Unlock the automatic furnace control-
ler.
If a leak test is made with the valves
the automatic furnace controller
should not be unlocked until the leak
test has been successfully completed.
The burner will start according to the
program flow preset by the automatic
furnace controller. The burner will now
be in operation. In case a leak is
detected with the valves the program
will not proceed to the automatic fur-
nace controller.
