18
L.
Check low water cut-off
(if used). Drain boiler water
below LWCO set point. Burners should extinguish.
M.
Check limit.
1. Adjust thermostat to highest setting.
2. Observe temperature gauge. When temperature is
indicated, adjust limit to setting below observed
temperature. Main burners and pilot burner should
extinguish and blower stop.
3. Adjust limit to setting above observed temperature.
Ignition sequence should begin.
4. Adjust thermostat to lowest setting. Adjust limit to
desired setting.
N.
Adjust gas input rate to boiler (Natural Gas).
1. Adjust thermostat to highest setting.
2. Check manifold gas pressure. Manifold pressure is
listed on rating label. Adjust gas valve pressure
regulator as necessary (turn adjustment screw
counterclockwise to decrease manifold pressure, or
clockwise to increase manifold pressure). If pressure
can not be attained, check gas valve inlet pressure. If
less than minimum gas supply pressure listed on
rating label, contact gas supplier for assistance.
3. Clock gas meter for at least 30 seconds. Use Table 6
to determine gas fl ow rate in Cubic Feet per Hour.
4. Determine Input Rate. Multiply gas fl ow rate by gas
heating value.
Table 6: Gas Flow Rate in Cubic Feet per Hour
s
d
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c
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S
e
n
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o
f
n
o
i
t
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l
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e
R
l
a
i
D
r
e
t
e
M
s
a
G
f
o
e
z
i
S
f
l
a
H
-
e
n
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.
t
F
.
u
C
e
n
O
.
t
F
.
u
C
o
w
T
.
t
F
.
u
C
0
3
0
6
0
2
1
0
4
2
2
3
6
5
3
1
1
5
2
2
4
3
3
5
6
0
1
2
1
2
6
3
0
5
0
0
1
0
0
2
8
3
7
4
5
9
9
8
1
0
4
5
4
0
9
0
8
1
2
4
3
4
6
8
2
7
1
4
4
1
4
2
8
4
6
1
6
4
9
3
8
7
7
5
1
8
4
7
3
5
7
0
5
1
0
5
6
3
2
7
4
4
1
2
5
5
3
9
6
8
3
1
4
5
3
3
7
6
3
3
1
6
5
2
3
4
6
9
2
1
8
5
1
3
2
6
4
2
1
0
6
0
3
0
6
0
2
1
5. Compare measured input rate to input rate listed on
rating label.
a. Boiler must not be overfi red. Reduce input rate
by decreasing manifold pressure. Do not reduce
more than 0.3 inch w.c. If boiler is still overfi red,
contact your Burnham distributor or Regional
Offi ce for replacement Gas Orifi ce.
b. Increase input rate if less than 98% of rating
label input. Increase manifold gas pressure no
more than 0.3 inch w.c. If measured input rate is
still less than 98% of rated input:
i.
Remove Main Burners per procedure in
Section VIII: Service.
ii.
Remove gas orifi ces. Drill one (1) drill size
larger (drill size is stamped on orifi ce, or see
Key No. 4D).
iii.
Reinstall gas orifi ces and main burners.
Measure input rate.
6. Recheck Main Burner Flame.
7. Adjust thermostat to normal setting.
8. Return other gas-fi red appliances to previous
conditions of use.
O.
Adjust gas input rate to boiler (LP/Propane).
1. Adjust thermostat to highest setting.
2. Check manifold pressure. Adjust gas valve pressure
regulator to obtain 10 inches w.c. manifold pressure.
Adjust gas valve pressure regulator as necessary
(turn adjustment screw counterclockwise to decrease
manifold pressure, or clockwise to increase
manifold pressure). If pressure can not be attained,
check gas valve inlet pressure. If less than minimum
gas supply pressure listed on rating label, contact
gas supplier for assistance.
3. Recheck Main Burner Flame
4. Adjust thermostat to normal setting.
P.
COMBUSTION CHAMBER BURN-OFF
1. The mineral wool combustion chamber panels
contain a cornstarch based binder that must be
burned out at installation to prevent odors during
subsequent boiler operation.
2. Ventilate the boiler room, set the high limit to its
maximum setting, set the thermostat to call for heat.
Allow the boiler to fi re for at least an hour or until
the odor from the cornstarch has dissipated.
3. Return the high limit and thermostat to their desired
settings.
Q.
Review User's Information Manual
and system
operation with owner or operator.
R.
Post instructions
near boiler for reference by owner
and service personnel. Maintain instructions in legible
condition.
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