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.
2.3.6INITIAL 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
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).
2.3.7ADJUSTING 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
37
Date: 8-4-2010
Revision: 0
Form: 2396
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.
2.3.8ADJUSTING 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 oF.
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| Boiler Model |
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| TF300 | TF250 | TF200 | TF150 |
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Pilot | Gas | 3.5 - 4 | 3.5 - 4 | 3.5 - 4 | 3.5 - 4 |
Pressure | |||||
(IWC) |
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Light | Off | 1800 | 1800 | 1200 | 1200 |
RPM |
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High Fire |
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