DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONS
Page 36
Figure 21 - Heat Exchanger Upper Rail Screws
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 "BOILER/WATER HEATER 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
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. 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 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 Figure 22.
WARNING: A yellow, fl oating fl ame indicates a
lack of combustion air. A lifting fl 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 & Main Burner Flame
