CleaverBrooks ProFire Q Series, Installation Operation & Maintenance

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Installation
2-8
750-437
Q Series Full Modulation
2.10 — Combustion Air Inlet Orifice Plate Installation
The Q burner size 6 and 8 use air-inlet-orifice plates to limit combustion air to the maximum firing rate needed
with respect to an application. The Q6 has a maximum rating of 1,500,000 BTU/HR. When used for the
maximum rate an air-inlet-orifice plate is not used. The same is true of the Q8 when used at its maximum rating
of 2,500,000 BTU/HR. For other firing rates, the chart below identifies the air-inlet orifice plate required:
If an orifice plate is required, Install the provided plate to the blower assembly as shown in Figure 2-8 below.
Remove the existing (6) bolts from the fan-assembly inlet collar and air-pressure sensing line. Align the plate and
air-inlet sensing line then replace the (6) bolts. Use a medium thread locker such as Loctite Blue to assure
secure retention.
TABLE 2- 1.
Air Inlet Orifice Plate Application
Model Burner BTU/HR rating Air inlet Plate Part Number Orifice Diameter (in)
Q6
550,000 059-11448-000 1.50
750,000 059-11449-000 1.80
1,000,000 059-11450-000 2.25
1,300,000 059-11452-000 2.95
1,500,000 no orifice plate used -
Q8
1,750,000 059-11457-000 3.45
2,000,000 059-11458-000 3.80
2,500,000 no orifice plate used -
FIGURE 2-8.
Inlet Orifice Plate Installation