LCD Series Finned Copper Tube Gas Boilers & Water Heaters – Boiler Manual
36
Figure 21
Heat exchanger upper rail screws
Vent System
Thoroughly inspect the vent system for any signs of blockage,
corrosion or leakage and periodically clean screen in vent terminal
(where applicable). 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 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 - this may be due to thermal expansion in
a closed water supply system. 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
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.
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
