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See Figure 14 in Section 6 (Electrical) for locations of
these devices,
1. FLAME ROLL OUT SAFETY SHUTOFF SWITCH
(FLAME ROLL-OUT SWITCH) A thermally
activated switch located between the first burner
from the left and the manifold bracket. The flame
roll out safety shut-off switch will sense excessive
temperature caused by continued flame roll-out and
shut down main burner gas This is a non recycling
switch that must be replaced once it has been
activated and the cause of the roll out eliminated
2.
fD]q _: I :[_ [4I_,_[c_I:Ill :,iL'_1:1"| Ih,_l"-.]Ii
3.
4.
DIFFERENTIAL PRESSURE SWITCH - This device
senses a negative or suction pressure in the blower
housing and air box when the blower is energized. If
there is not excessive blockage in the venting system
or air inlet vent the switch will close, allowing power
to energize the ignition system
LIMIT - A thermally activated, manually adjustable
switch located on the right side of the boiler. The
temperature sensing element is placed in the supply
and will shut down main burner gas if the supply
water exceeds the preset temperature limit. This is a
recycling switch that will automatically reset when
the supply water falls below the preset temperature.
LOW WATER CUYOFF (FOR GRAVITY SYSTEMS
OR HOT WATER BOILERS INSTALLED ABOVE
RADIATION LEVEL) - A level-sensing device (float
or probe) located in supply piping near the boiler If
water level in the system drops below the control's
position, it will shut down main burner gas. The
control will automatically reset once the water level
rises above its position
2
3.
4.
To adiust gas pressure, turn adiustin9 screw of _as
pressu1_regulator counterclockwise to decrease
pressure, clockwise to increase pressure Refer to
Figure 20 for location of gas pressure regulator
Replace the cap screw when adjustment is complete
In 11ocase should the final manifold pressure vary
more than _+03 inches water column from the
above specified pressures. Any necessary major
changes in the flow should be made by changing the
size of the burner orifice spuds.
When adiustment is complete, turn off boiler, gas
flow and electricity to boiler. Remove manometer
connection from valve and plug tapping with plug
provided Turn utilities back on and resume
checkout.
I. Refer to rating label mounted on the jacket top panel
to obtain the rated BTU per hour input. In no case
shall the input to the boiler exceed the value shown
on the rating label
2 Check input by use of the following formula
(Poedess suggests reading meter for 2 Cu.Ft.):
3.
BTU/Hr. Input=3600 x F x H
T
3600 - Seconds per hour
F Cubic Feet of Gas Registered on Meter
H Heat Value of Gas in BTU/Cubic Feet
T Time in Seconds the Meter is Read
As an alternative, use Table 6. Use the heating value
provided by gas supplier, Use a stopwatch to record
the time it takes for 2 cubic feet of gas to pass
through the meter Read across and down to
determine rate.
1. Using the manometer setup installed in part 7A, set
manifold pressure as follows for various gases.
a. Natural Gas .......... 3.5" Water Column
b. LP Gas ............ 10.0" Water Column
22
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