SPECTRUM INSTALLATION AND OPERATING INSTRUCTIONSPage 24
Figure 12 - Burner Drawer Assembly
Combustion Chamber Inspection
1. Remove the burner drawer following the instructions
above.
2. Inspect the combustion chamber panels using a
mirror and light. If any of the combustion chamber
panels are damaged or show signs of deterioration
replace them.
3. Replacement of the combustion chamber panels
requires that the heat exchanger be removed as
outlined below.
4. Reinstall the burner drawer as outlined above.
Heat Exchanger Inspection & Cleaning
1. Close the manual shutoff valve in the gas supply
line and turn off electrical power to the boiler/water
heater.
2. Close the shut off valves in the inlet and outlet pip-
ing. Relieve the system pressure from the boiler/
water heater by carefully opening the drain valve.
3. Disconnect the boiler/water heater from the system
piping.
4. Remove the left and right headers and mounting
studs.
5. Disconnect the fl ue pipe at the boiler/water heater.
6. Remove the top jacket panel.
7. On indoor units remove the draft hood from the back
of the unit. On outdoor units remove the rear jacket
panel.
8. Remove the fl ue collector.
9. Carefully lift the heat exchanger out of the unit and
thoroughly inspect it.
10. The outside surfaces of the copper tubes should be
free of any soot deposits. A slight black smudge is
normal with some types of gases. Black soot
indicates poor combustion. Green deposits indicate
condensation due to low return water temperatures.
In either case the heat exchanger must be cleaned
thoroughly with water and the problem resolved
before the boiler/water heater is returned to service.
11. Replace the cleaned heat exchanger and other
components in the reverse order of their removal.
Heat Exchanger Replacement
1. Sagging or distorted heat exchanger tubes are an
indication of low water fl ow 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 fl oat type low water cutoff device must be fl ushed
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 cutoffs operate properly. If not,
replace them.
3. The fl ow switch contacts must be open when water
fl ow is not present.
4. The relief valve should not weep or discharge water
at normal system pressure. If it does contact a quali-
fi ed 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. It should be set at least
20°F, 11°C above the operator set point. 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 fl ames to
ensure proper operation, see Figures 11 & 13.
WARNING: Yellow, fl oating fl ames indicate a lack
of combustion air. A lifting fl ame indicates too
much combustion air. Do not operate the boiler
until the problem is solved or severe personal
injury or death may occur!
Figure 13 - Main Burner Flames
NORMAL
(HARD FLAME)
LIFTING
(TOO MUCH AIR)
YELLOW TIPPING
(MARGINAL)
YELLOW FLAME
(TOO LITTLE AIR)
RIOM-55
RIOM-49
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