CleaverBrooks ProFire Q Series, Installation Operation & Maintenance

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Operation
3-6
750-437
Q Series Full Modulation
Reference the “LMV Troubleshooting” section duplicated in this manual for additional “{Loc. C}” error code and
“{Loc.d}” diagnostic information.
3.3 — Gas Pressure Regulator Setup
To determine the initial pressure setting of the gas pressure regulator
(for gas trains consisting of a regulator and two safety shut off valves) a
good rule of thumb is to adjust the regulator set point to twice the high
fire manifold pressure. If using a Siemens gas train, with the regulator
being the last component before the gas metering butterfly valve, set
the regulator set point to 1.5 times the high fire manifold pressure.
Fuel/air ratio curve setup may then proceed.
3.3.1 — Regulator Spring Selection
After determining the pressure setting as described above, use Table
3.3 to select the appropriate regulator spring.
Where possible, spring selection should be made so that the pressure setpoint falls within the upper 50% of the
spring range. For example, for a setpoint of 5.0”, the Plated spring (3-6” range) is preferable to the Pink spring
(3-8” range).
3.4 — Gas Train Leak Test
Note: In this section, AZL display text is shown in brackets, e.g. “{OFF}.”
A gas safety shutoff valve leak test (Bubble Test) must be performed prior to any initial commissioning or
subsequent maintenance of the burner and gas train system. This test should be performed periodically to ensure
no leakage of valves in their closed or de-energized position (refer to the valve manufacturer's procedures). The
unit should be taken out of service if the unit fails any part of the gas valve leak test. Any defective part must be
replaced prior to putting the equipment back into service.
Refer to Figure 3-2 when following this procedure:
TABLE 3- 3.
Regulator Spring Selection
SPRING COLOR
PRESSURE
RANGE (“WC)
Brown 1.0 - 3.5
Plated 3.0 - 6.0
Pink 3.0 - 8.0
Blue 5.0 - 12
Red 10 - 22
*Excludes furnace pressure. Add furnace
pressure to determine total manifold
pressure for your specific application.
TABLE 3- 2.
Burner Manifold Pressure*
Burner MBH
Manifold
Pressure
(“WC)*
Q6
550 0.65
750 1.00
1,000 1.70
1,300 2.25
1,500 3.10
Q8
1,750 2.30
2,000 2.50
2,500 3.50