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16 -CHECKING
GAS INPUT
RATE TO BOILER
Adjust gas input to boiler by removing protective cap on
pressure regulator, and turning screw_clockwise _
to
increase input and counterclockwise
_
]b to decrease
input.
Manifold pressures are taken at outlet side of gas
valve,
To check for proper flow of natural gas to boiler, divide
input rate shown on rating plate by heating value of
gas obtained from local gas company, This determines
number of cubic feet of gas required per hour,
With all other gas appliances off, determine flow of gas
through meter for two minutes and multiply by 30 to
get hourly rate,
Make minor adjustments
to gas input as described
above.
Change
burner
orifices
if final
manifold
pressure
varies
more than
plus or minus 0.3 inches water
column
from specified
pressure.
Primary
air adjustment
is not necessary,
therefore
air shutters
are not furnished
as standard
equipment.
Air shutters
can be furnished
on request
where
required
by local codes or conditions.
Figure
21
Burner Access
Door
- High
Limit
Control
Location
High Limit and
Operating
Control
_--_ocated
Inside
Boiler
CHECK
SAFETY
CONTROL
CIRCUIT.
Test ignition
system
safety
shutoff
device after
placing
boiler
in
operation.
Pilot" With main burner operating,
turn pilot gas
adjusting
screw clockwise _
until pilot gas is
turned off. Within 90 seconds' "main gas control closes,
shutting
off gas to main burner.
--
Gas Valve
2_
High Limit Control:
Remove cover and note
temperature
setting. Decrease this setting to minimum
and operate boiler. When the boiler water temperature
exceeds the control temperature
setting, the control
will open the circuit, closing the automatic main gas
valve. See Figure 21.
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