RBI LCD Series Installation & Operation Manual page 33

Vent System
Thoroughly inspect the vent system for any signs of
blockage, corrosion or leakage. Immediately replace any
unsound vent system piping.
Figure 21- Heat Exchanger Upper Rail
Controls
Use the "BOILER/WATER HEATER OPERATION" and
"CHECKING AND ADJUSTMENT" sections of this
manual for reference.
1. Check the thermostat or operating controls for
proper operation.
2. A float type low water cutoff device must be flushed
out per the manufacturers' instructions. The probe
on a probe low water cut off must be cleaned and
inspected per the manufacturers' instructions.
Ensure that the low water cutoffs operate properly.
If not, replace them.
3. The flow switch contacts must be open when water
flow is not present.
4. The relief valve should not weep or discharge water
at normal system pressure. If it does contact a
qualified service technician to have it inspected.
NEVER try to clean or repair the relief valve! If the
valve fails to operate properly, have it replaced!
LCD INSTALLATION AND OPERATION INSTRUCTIONS
5. The aquastat high limit controls the maximum water
temperature in the boiler. It should be set at least
20°F, 11°C above the operater setpoint. If the water
temperature reaches the set temperature before
the demand for heat has been met, the aquastat
high limit should shut the boiler off. The water
temperature should never exceed the maximum set
point of 240°F, 116°C . The aquastat high limit
cannot be repaired. If it fails to function properly
replace it.
6. Visually check the pilot and main burner flames to
ensure proper operation, see Figure 22.
WARNING: A yellow, floating flame indicates a
lack of combustion air. A lifting flame indicates
too much combustion air. Do not operate the
boiler/water heater until the problem is solved
or severe personal injury or death may occur!
Figure 22 - Pilot & Main Burner Flame
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