Williamson-Thermoflo GWC-070 Manual page 78

GWC -
gas fired water boiler
Troubleshooting
Common causes and possible corrections, part 2
Figure 91
Symptom
Popping or percolating
noise heard in boiler
Metal flakes found in vent
outlet or recuperator —
flueway corrosion
Some radiators or
baseboard units do not
heat or are noisy
78
— Boiler Manual
(continued)
Common Causes
Mineral deposits in sections due
to constant use of makeup water
Incorrect pH of boiler water
Insufficient water flow through
boiler
Contaminated combustion air
supply — See manual page 13.
Condensation of combustion
gases in boiler sections
Air in system
Low system pressure
High limit set too low
Possible Corrections
Call qualified service technician to de-
lime boiler, if necessary. In some cases,
deposits will be too heavy to remove with
de-liming procedures.
Have qualified service technician repair
leaks to eliminate need for constant
makeup water.
Call qualified service technician to check
pH level and correct. pH should be
maintained between 7.0 to 8.5.
Check all valves to and from boiler. Return
to proper setting.
Confirm circulator size.
Remove any contaminating products, see
manual page 13.
Provide outside air for combustion. Have
qualified service technician pipe-up kit.
Have qualified service technician check
operation of mixing system. Repair/replace
if necessary.
Bleed air from system through air vents in
radiators or baseboard units.
Fill to correct pressure.
Check for leaks in boiler or piping. Have
qualified service technician repair at once.
Adjust high limit to higher setting.
Part number 550-142-056/0411