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Unit Start-up
3.
Use a flue analyzer to measure the oxygen (O
carbon dioxide (CO
), and carbon monoxide (CO)
2
levels in the flue gas.Take several readings to ensure
burner operation is stable.
4. See
Table 58, p. 121
for the required oxygen level
during LOW fire operation. If the measured oxygen
level is not within the specified range, turn the
adjustment screw on the ratio regulato
Refer to the illustration in
adjustment screw location. For high O2, increase ½
turn (CW). For low O2, decrease ½ turn (CCW)
5. High Fire O2 Adjustment: Adjust the User interface to
operate the furnace at max firing rate (100%) or 2
Stage. Allow the system to operate for 10 minutes to
allow the burner to stabilize.
6. Use a flue analyzer to measure the oxygen (O
carbon dioxide (CO
), and carbon monoxide (CO)
2
levels in the flue gas. Take several readings to ensure
burner operation is stable.
7. See
Table 58, p. 121
for the required oxygen level
during HIGH fire operation. If the measured oxygen
level is within the specified range and the carbon
dioxide level is between 8.5 to 10% and the CO is less
than 100 PPM, no adjustment is necessary. If an
adjustment is needed, check the air damper on the
burner (closing will increase the CO2 level). See
105, p. 123
for air damper location. For high O2, close
½ notch. For low O2, open ½ notch.
8. If any adjustments were made during Low Fire O2
Adjustment and High Fire O2 Adjustment, repeat Steps
1 through 7 to confirm oxygen levels for both low and
high fire are within specified range on
9. Low Fire Manifold Pressure: Adjust the User interface
to operate the furnace at low firing rate (1%) and/or 1st
Stage. Allow the system to operate for 10 minutes to
allow the burner to stabilize. Check manifold pressure
at tap closest to where the valve train attaches to the
burner.
10. See
Table 58, p. 121
for the expected manifold
pressure during LOW fire operation. If manifold
pressure is not within the specified range, adjust P0
(ignition speed of blower) and P1 (low fire speed of
blower). See
"Adjusting P0, P1, and P2 via the
Siemens LME7 Built-in Display," p. 120
Important: P0 and P1 should always match each other.
11. High Fire Manifold Pressure: Adjust the User
interface to operate the furnace at max firing rate
nd
(100%) or 2
Stage. Allow the system to operate for
10 minutes to allow the burner to stabilize. Check
manifold pressure at tap closest to where the valve
train attaches to the burner.
12. See
Table 58, p. 121
for the expected manifold
pressure during HIGH fire operation. If manifold
pressure is not within the specified range, adjust P2
(high fire speed of blower). See
120
),
2
Figure 103, p. 122
for
nd
),
2
Figure
Table 58, p.
121.
for instructions.
"Adjusting P0, P1, and
P2 via the Siemens LME7 Built-in Display," p. 120
instructions.
13. If any adjustments were made during Low Fire
Manifold Pressure and High Fire Manifold Pressure,
repeat Steps 9 through 12 to confirm manifold
pressures for both low and high fire are within specified
range on
Table 58, p.
121.
14. Adjust the User interface to operate the furnace at low
firing rate (1%) and 1st Stage. Recheck O2 (or CO2)
and CO values.
15. Press the STOP key in the top right corner of the User
interface screen and remove manual overrides to stop
the system operation.
Adjusting P0, P1, and P2 via the Siemens
LME7 Built-in Display
1. While in standby (OFF), press and hold the A button
and either the + or - button for more than five seconds
until "OFF" starts blinking.
2. Give the LME7 a call for heat. The LME7 will proceed to
start the burner. After prepurge is complete, the LME7
will slow the blower down to the preset ignition speed
(P0).
3. At this point, the LME7 will alternately display P0 and a
three-digit number. The three-digit number is the
setting of the ignition speed P0 divided by 10. For
example, if the display alternately displays P0 and 200,
this means that the ignition speed is currently set for
2000 RPM.
4. To adjust the ignition speed, press and hold the A
button while simultaneously pressing the + or - button
to increase or decrease the speed respectively. The
speed of the blower will change in real time. Once the
desired ignition speed P0 has been set, press the info
button.
5. The startup of the burner will continue. The burner will
light off and establish flame. Once the burner has lit off,
it will drive to the preset low fire speed (P1).
6. The LME7 will then alternately display P1 and a three-
digit number that is representative of the low fire speed
divided by 10. To adjust the low fire speed, press and
hold the A button while simultaneously pressing the +
or - button to increase or decrease the speed
respectively. The speed of the blower will change in
real time. Once the desired low fire speed P1 has been
set, press the info button.
7. The LME7 will immediately drive to the preset high fire
speed P2.
8. The LME7 will then alternately display P2 and a three-
digit number that is representative of the high fire speed
divided by 10. To adjust the high fire speed, press and
hold the A button while simultaneously pressing the +
or - button to increase or decrease the speed
respectively. The speed of the blower will change in
real time. Once the desired high fire speed P2 has
been set, press the info button.
for
RT-SVX072D-EN
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