RBI DOMINATOR Series - Page 35

Finned copper tube gas boilers & water heaters – Boiler Manual
35
Figure 21 Heat Exchanger Upper Rail Screws
Vent System
oroughly inspect the vent system for any signs of blockage,
corrosion or leakage. Immediately replace any unsound vent system
piping.
Controls
Use the "BOILER/WATER HEATER OPETION" and
"CHECKING AND ADJUSTMENTS" sections of this manual
for reference.
1. Check the thermostat or operating controls for proper operation.
2. oat type low water cuto device must be ushed out per the
manufacturers' instructions. e probe on a probe low water
cut o must be removed, cleaned and inspected at least once
a year. Ensure that the low water cutos operate properly. If not,
replace them.
3. e ow switch contacts must be open when water ow is not
present.
4. e relief valve should not weep or discharge water at normal
system pressure. If it does, contact a quali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. e aquastat high limit controls the maximum water
temperature in the boiler. It should be set at least 20°F, 11°C
above the operator 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 o. e water
temperature should never exceed the maximum set point of
240°F, 116 °C. e aquastat high limit cannot be repaired. If
it fails to function properly replace it.
6. Visually check the pilot and main burner ames to ensure proper
operation, see Figure 22.
A yellow, oating ame indicates a lack of combus-
tion air. A liing ame 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 and Main Burner Flame