32
RPB-IOM (06-22) 131782-B
OPERATION—CONTINUED
Post-Startup Checklist
Observe burner flame at full fire. Natural gas flame should be about 1-1/2 inches in height with blue coloring.
Propane gas flame should be approximately same height with blue coloring. Yellow tipping may appear on propane
gas. If yellow extends beyond 1/2- to 3/4-inch, adjust air shutters (refer to Burner Air Shutter Adjustment
section). If shutter adjustment does not reduce yellowing, check for gas leaks at control manifold or orifice fitting.
Turn unit OFF and ON, pausing 2 minutes between each cycle. Observe to verify smooth ignition. On two-stage or
modulating burner systems, manipulate temperature adjustment slowly up and down to see if control is sequencing
or modulating properly. Raising temperature setting drives burner on or to full fire.
Using manometer or slant gauge readable up to 14 IN WC, check orifice manifold for operating pressure on full
fire. Natural gas should be 3.5 IN WC at this point. Propane gas should be 10 IN WC at this point. Variations
from these pressures are not recommended as ignition and efficiency performance can be adversely affected by
improper pressure adjustment (refer to Measure and Adjust Manifold (Outlet) Gas Pressure section).
Close all panels tightly. With heater ON, check limit control by completely blocking off distribution air. Limit control
should open within few minutes to shut OFF gas supply to main burners.
Place owner’s envelope containing Limited Warranty Card, this manual, and any optional information in accessible
location near heater. Follow instructions on envelope.
⚠ DANGER ⚠
• The gas burner in this gas-fired equipment is designed and equipped to provide safe, controlled,
complete combustion. However, if the installation does not permit the burner to receive the
proper supply of combustion air, complete combustion may not occur. The result is incomplete
combustion, which produces carbon monoxide, a poisonous gas that can cause death.
• Safe operation of indirect-fired gas burning equipment requires a properly-operating vent system
that vents all flue products to the outside atmosphere. FAILURE TO PROVIDE PROPER VENTING
WILL RESULT IN A HEALTH HAZARD THAT COULD CAUSE SERIOUS PERSONAL INJURY OR
DEATH.
• Always comply with the combustion air requirements in the installation codes and instructions.
• Combustion air at the burner should be regulated only by manufacturer-provided equipment.
NEVER RESTRICT OR OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR TO ANY HEATER.
ADJUSTMENTS
Belts, Blowers, and Drives
Checking and Adjusting Belt Tension
• Proper belt tension is important to the long life of the belt and motor. A loose belt will cause wear and slippage.
Too much tension will cause excessive motor and blower bearing wear. Check belt tension as shown in Figure 18.
• If the belt cannot be depressed 3/4 inches (19 mm), as shown in Figure 18, adjust the belt tension as follows:
a. Ensure that belt is aligned in pulley grooves properly and is not angled from pulley to pulley.
b. Loosen adjusting screw locknut on motor base and turn adjusting screw until belt can be depressed 3/4 inches
(19 mm).
c. When correct belt tension is achieved, retighten adjusting screw locknut.
To Next Page
Loading...
