Weil-McLain 550-141-830/1202 - Manual (Page 7)

7
The problems and corrections above represent common situations that can occur.
There may be others not listed above. It is important always to contact a qualified service techni-
cian if you have any questions about the operation of your boiler or system.
COMMON PROBLEMS COMMON CAUSES POSSIBLE CORRECTIONS
Rapid cycling - burner turns
on and off frequently. Thermostat installed where drafts or
heat affect reading. Locate thermostat on inner wall away from
heat sources or cool drafts.
Heat anticipator in thermostat
adjusted incorrectly.
Adjust heat anticipator to match current
draw. Refer to boiler wiring diagram.
Incorrect limit setting. Have qualified service technician increase
limit setting to decrease cycling. Normal
operation is usually less than 5 psig.
Need to frequently add
makeup water. Leaks in boiler or piping. Have qualified service technician repair leaks
at once to avoid constant use of makeup
water.
Popping or percolating noise
heard in boiler.
Mineral deposits in sections due to
constant use of makeup water. or
incorrect pH.
Have qualified service technician de-lime
boiler and repair leaks at once to avoid
constant use of makeup water and check
pH (7.0-8.5).
Metal flakes found in flueway. Contaminated combustion air supply. Remove sources of hydrocarbons in or
near boiler area. (Bleaches, cleaners,
chemicals, sprays, fabric softeners, paint
remover, etc.)
Condensation of combustion gases. Have qualified service technician check
boiler operation.
Isolated radiation does not
heat. Air vents or traps inoperative. Have qualified service technician repair,
clean or replace air vents or traps.
Water disappearing from
gauge glass and back into
system through return piping. Incorrect Hartford Loop piping. Have qualified service technician pipe boiler
exactly as shown in Boiler Manual.
Check-valve inoperative. Have qualified service technician clean or
replace check-valve.
Vacuum-breaker inoperative. Have qualified service technician clean or
replace vacuum breaker.
Violent waterline fluctuations
- surging.
OR
Water passing into steam
mains - priming.
Dirt, oil or other impurities in water. Have qualified service technician skim
boiler.
Waterline too high. Have qualified service technician adjust
waterline to normal height.
Incorrect piping. Have qualified service technician pipe boiler
exactly as shown in Boiler Manual.
Sudden release of boiler steam
pressure by action of zone valves.
Have qualified service technician adjust
valve operating time or install slow-opening
valves.
Domestic water from tankless
heater is hot then suddenly
turns cold.
OR
Domestic water from tankless
heater is always lukewarm.
Mineral deposits insulate internal
waterways of heater. Have qualified service technician delime or
replace coil.
Boiler stop-leak compound has been
added to boiler water and is insulating
outside of coil.
Have qualified service technician remove
and clean coil AND drain and flush boiler to
remove stop-leak.
Incorrect mixing valve setting for
tankless heater.
Have qualified service technican adjust
mixing valve setting.
Domestic flow rate too high. Have qualified service technician install flow
check valve set to rating of tankless heater.
Incorrect setting on tankless heater
control. Have qualified service technician raise
tankless control setting. Adjust differential
on tankless control to lower setting.