Smith Cast Iron Boilers Series 28A - Manual (Page 23)

Page 23 SERIES 28A BOILER INSTALLATION AND OPERATION INSTRUCTIONS
BOILER CHECKING & ADJUSTMENT
CAUTION: Never increase the input to the boiler
above that for which it is rated. Doing so can cause
premature failure of the boiler!
Low Water Cutoff
Ensure that the low water cutoff device(s) function(s)
properly. Test in accordance with the manufacturer’s
instructions included with the device(s).
Hi Limit
The aquastat high limit controls the maximum water
temperature in the boiler. It is adjustable from 140
°
F,
60
°
C to 240
°
F, 116
°
C. 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.
Figure 24 - Recommended Overflow Trap Piping
Heat Exchanger Cleaning
A flue temperature over 550
°
F, 288
°
C, indicates that the
boiler needs to be cleaned.
1. Shut off the electrical power and the fuel supply to
the boiler.
2. Remove the left side jacket panels.
3. Remove the cleanout covers, Figure 7.
4. Clean each flue passage with a wire brush.
5. If heavy deposits are present, pull the burner and
vacuum out the combustion chamber.
BOILER MAINTENANCE
WARNING: Servicing, inspection and adjustment
of the boiler must be done by a trained
technician in accordance with all applicable
local and national codes. Improper servicing or
adjustment can result in property damage,
severe personal injury or death!
The boiler should be cleaned and inspected once a year,
before each heating season.