Beckett CG4 - Manual (Page 21)

21 CG4 Burner Manual
Section: START THE BURNER
4. Start the burner and use a stopwatch to measure
the number of timed seconds it takes for the
burner to fire 1 cubic foot of gas.
5. Calculate the firing rate in BTU/Hr. using the
following equation:
Firing rate BTU/Hr. = Heating value (BTU/Ft 3 ) x
3,600 ÷ Timed seconds
For example, if the heating value is 1,050 BTU/Ft 3
and you timed 1 cubic foot of gas at 42 seconds
then firing rate BTU/Hr = 1050 x 3,600 ÷ 42 which
calculates to 90,000 BTU/Hr.
If the burner is firing LP gas, a meter is usually
not available. Contact your LP supplier for
recommendations.
Figure 15 – Gas Valve Pressure Adjustment
Regulator
Cover Screw
Regulator
Adjust Screw
Outlet Pressure Tap Gas Valve
Check Operation and Safety Controls
Explosion, Fire and
Asphyxiation Hazard
Testing by Qualified Technician Required.
Failure to properly test and verify the
correct function of operation and safety
controls could lead to equipment malfunction and
result in asphyxiation, explosion or fire.
The testing of operating and safety controls requires
technical training and experience with power gas
burners and appliances.
Carefully follow the manufacturer’s instructions supplied
with the appliance and the controls.
Verify the correct function of all operating and safety
controls used in the installation.
If instructions are not available, use the following
recommended procedures and record all results in a
start-up log.
1. High limit/ Pressure Control – To check the High
Limit, raise the temperature or pressure of the
operating control to a higher level and lower the
limit to a setting less than the operating control. Run
the burner until the high limit opens and shuts the
burner off. Adjust the controls back to the desired
settings.
2. Operating control – Run the burner until the
operating control shuts it off. If necessary, make
adjustments to ensure the control cycles the burner
in the desired temperature or pressure range.
Operating controls should
be set to minimize the
number of firing cycles that the burner runs.
High cycling rates increase the possibility of
light-off lock outs.
3. Low water cutoff (LWCO) – With the burner firing,
open the blow down valve on the low water cutoff,
if applicable. As the water level drops, the LWCO
switch contacts open and shut the burner off. When
the water level rises, the LWCO contacts close
and restart the burner. Monitor the LWCO switch
operation in relation to the water level in the sight-
glass for synchronization.