Weil-McLain GV90+ Installation And Start-Up Manual page 81

GV90+ Series 2
OAS·FIRED WATER BOILER -
Boiler Manual
Troubleshooting
(continued)
Fi gure 94 Common causes and possible cooections.
part
1
Symptom
Common Causes Possible Corrections
Rapid cycling - boiler Thermostat installed where drafls Locate thennostat on inner wall away from
turns on and off frequently or heat affect reading heat sources or cool drafts.
Heat anticipator in thennostal Adjust thermostat per manufacturer's
a~usted inoorrectly instructions.
Incorrect limit setting Set limit aooording to system needs.
Maximum setting is 2oo•F. Increase limit
setting to decrease cycling.
Insufficient water flow t hrough
Check all valves to and from boiler. Return
boiler to proper setting.
Confirm circulator size.
Frequent release of water Expansion tank sized too small
Call quatKied service technician to chec·k
through relie f valve
expansion tank operation and size.
Aooded expansion tank
Call quatKied service technician to chec·k
expansion tank operation.
Inoperative limit control
Call quatKied service technician to replace
limit control.
Need to frequently add
Leaks in boiler or piping
Have qualified service technician repair
makeup water
leaks at once to avoid constant use of
makeup water. Makeup water can ceuse
mineral deposits which, in turn, can cause
boiler section failure. Do not use petroleum-
base slop-leak compounds.
Black water condition
Oxygen oorrosion due to leaks in
Have qualified service technician repair at
boiler and piping once. Keep pH of water between 7.0 to 8.5.
Large t empe rature swings
Incorrect Eoonomy seHing Adjust Economy seHing on boiler oontrol.
in living space
Part number 550-14-2-783/1012
St