RBI SERIES 8800 Installation & Operation Manual page 27

SERIES 8800 & 8900 INSTALLATION AND OPERATING INSTRUCTIONS
Heat Exchanger Replacement
1. Sagging or distorted heat exchanger tubes are an
indication of low water flow through the system.
2. A damaged heat exchanger must be replaced and
the condition that caused the damage resolved
before the boiler/water heater is returned to service.
Vent System
Thoroughly inspect the vent system for any signs of
blockage, corrosion or leakage. Immediately replace any
unsound vent system piping.
Controls
Use the "GENERAL OPERATION" and "CHECKING
AND ADJUSTMENTS" 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 removed,
cleaned and inspected at least once a year. Ensure
that the low water cutoff 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!
5. The aquastat high limit controls the maximum
water temperature in the boiler and should be 20°F,
11 ° C above set point temperature. 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 Figures 13 & 14.
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 14 - Main Burner Flames
NORMAL
(HARD FLAME)
YELLOW TIPPING
(MARGINAL)
Page 27
LIFTING
(TOO MUCH AIR)
YELLOW FLAME
(TOO LITTLE AIR)
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