Operation
3-10
750-437
Q Series Full Modulation
Stack heat loss can be reduced by (a) decreasing stack temperature through improved heat transfer or (b),
decreasing the flue gas volume by decreasing excess combustion air. A certain amount of excess air is necessary
to complete combustion. See Table 3- 4 for excess air guidance.
Stack temperatures vary by system type but in clean, well-tuned vessels you may expect the following:
Hot Water Vessels:
Stack temperature is typically 75-100° F above the water temperature.
Steam Pressure Vessels:
Consult saturated steam tables to determine approximate stack temperature. Stack
temperature is normally 75 to 100°F over the saturated steam temperature. As an example, a 10 psig low-
pressure steam system at 80° F ambient air, can indicate a stack temperature of approximately 320°F. A 125
psig system under the same conditions increases the stack temperature to approximately 453°F.
3.6 — LMV3 Settings
This section guides you through adjustment of the fan speed and gas valve setting for the LMV3’s ignition point,
P0, and the low to high-fire points P1 through P9. A combustion analyzer is required. A pen and paper should
be on hand to keep a written record of the settings. Final setting values should be recorded in the startup service
report found at the back of this manual.
The Q burner LMV3 has ignition point P0 and fuel-curve points P1 through P9 entered in the control. These points,
however, must be adjusted to the specific application the burner is being installed on. If reasonable care is not taken
to tune combustion points to the application, hazardous combustion conditions may result.
Note:
Read Section 3.6 in its entirety before making any adjustments.
cations are also indicated by the burner panel lights:
Display Representation -
In this section, text on the AZL display is shown either graphically OR as text enclosed in
French brackets (example below).
Button References
- The AZL panel has five buttons. This section uses parentheses to reference their single and combi-
national use as follows:
(F), (A), (-), (+), (
enter), (reset)
(ESC / - & +)
=
pressing
(-)
and
(+)
buttons simultaneously and,
(VSD / F
&
A)
=
pressing
(F)
and
(A)
buttons simultaneously.
Manual Lockout
- In the case of an emergency, the installer can manually lockout the LMV3 by simultaneously pressing
(
enter)
in combination with any other button. Following lockout, the AZL will display
{Loc:c: 167} {Loc:d: 2}
.
Press
(reset)
until
{rESET}
appears.
!
Warning
Summary of Contents for ProFire Q Series
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Page 18: ...Introduction 1 8 750 437 Q Series Full Modulation...
Page 28: ...Installation 2 10 750 437 Q Series Full Modulation...
Page 50: ...Operation 3 22 750 437 Q Series Full Modulation...
Page 82: ...Troubleshooting 6 24 750 437 Q Series Full Modulation...
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