Finned copper tube gas boilers & water heaters – Boiler Manual
32
Controls
Use the “GENERAL OPERATION” and “CHECKING AND AD-
JUSTMENTS” sections of this manual for reference.
1. Check the 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 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. 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. 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
250°F
,
121°C
, for
boilers and
210°F
,
99°C
for water heaters. 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 24.
A yellow, floating flame indicates a lack of combustion
air. Do not operate the boiler/water heater until the
problem is solved or severe personal injury or death
may occur!
Figure 24
Main Burner Flame
