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Date: 8-4-2010
Revision: 0
Form: 2396
WARNING:
During pilot adjustment leave the
manual main gas cock (Figure 7 item
4) closed.
NOTE:
Pilot gas pressures in excess of the
recommended will lead to the formation of
carbon hairs that will ground out the pilot igniter
causing a safety shutdown.
2.3.6 INITIAL LIGHT OFF
Open the manual main gas cock (Figure 7 item
4). Clear the lockout fault (paragraph 2.2.10)
and allow the burner to cycle and attempt to light
off. If the main flame fails to light, the low fire
displacement of the pressure regulating actuator
(Figure 7 item 2) may need to be increased.
WARNING:
Do not adjust the low fire displacement
more than 1/4 to 1/2 turn for each main
flame-establishing period.
The boiler will light off at approximately 1.5 times
the minimum firing rate rpm. The boiler will hold
in this position for no less than 5 minutes to
establish a stable flame before releasing the
boiler to full modulation. Observe combustion
readings and make small adjustments to the low
fire displacement of the pressure regulating
actuator (Figure 7 item 2) when the O2 is not
within 6% to 10%. Allow sufficient time for
combustion to stabilize after each ¼ to ½ turn of
the low fire displacement (Figure 7 item 2).
2.3.7 ADJUSTING BOILER MAXIMUM
INPUT
After the flame stabilization period increase the
firing rate in 500 rpm increments until the
maximum modulation rate (paragraph 2.2.13) is
reached. For each 500 rpm increment observe
combustion readings and make adjustments to
the gas limiting orifice (Figure 7 item 26) if the
O2 is not within 6% to 10%. Final adjustments
for NOx, O2, and CO should be made at the
maximum firing rate. No further adjustments are
required of the gas limiting orifice valve. Return
to the minimum low fire rate (paragraph 2.2.13)
in increments of 500 rpm. For each increment
verify combustion readings. Refer to trouble
shooting (paragraph 0) for further help.
NOTE:
Use rpm values that fall between the rpm values
used going to high fire. This will give more
points to verify on the modulation curve.
2.3.8 ADJUSTING BOILER MINIMUM
INPUT
NOTE:
The boiler maximum input must be adjusted
before final adjustments can be made for
minimum input.
Decrease the boiler firing rate to the minimum
modulation rate (paragraph 2.2.13). Adjust the
O2 level to obtain Nox levels desired by
adjusting the low fire displacement on the gas
pressure regulating actuator to obtain
appropriate NOx, O2, and CO levels. Allow
sufficient time for combustion to stabilize after
each ¼ to ½ turn of the low fire displacement
(Figure 7 item 2).
WARNING:
O2 levels below 6% will overheat the
metal fiber burner and cause the fuel /
air mixture to ignite inside the burner.
An internal temperature fuse is
provided to open when the internal
burner temperature reaches 425
o
F.
37
Boiler Model
TF300 TF250 TF200 TF150
Pilot Gas
Pressure
(IWC)
3.5 - 4 3.5 - 4 3.5 - 4 3.5 - 4
Light Off
RPM
1800 1800 1200 1200
High Fire