INSTALLATION AND OPERATION INSTRUCTIONS
5-10
SL 20-115 G2 MODULATING GAS BOILER
SL 10-85 G3, SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS
5.3.4 Temperature Problems
SYMPTOM
DIAGNOSIS
REMEDY
INSUFFICIENT HEAT
Operating temperature
too low.
Increase temperature target.
Priority parameters
or load configuration
improperly set up.
Review load configuration parameters.
Unit undersized.
Refer to Load Calculation vs. Boiler Output.
Air trapped within
system.
Bleed system as required.
Improper system
piping.
Refer to recommended piping in
Section 1.6
System pump
undersized.
Check pump manufacturer’s data/check temp
differential across heat exchanger.
Poor gas/air mixing.
Check CO
2
level.
Defective thermostat.
Refer to manufacturer’s instructions.
Obstruction in
condensate drain.
Inspect and clean condensate drain.
Unit cycling on
operating/ safety
controls.
Check operation with Ohmmeter/Voltmeter.
System radiation
undersized.
Check manufacturer’s rating tables for capacity per
foot.
TEMPERATURE EXCEEDS
THERMOSTAT SETTING
Incorrect anticipator
setting.
Check with Ammeter.
Thermostat not level.
Check level.
ONE OR MORE ZONES DO
NOT HEAT PROPERLY
Air trapped within
zone(s) piping
Vent system/zone as required.
Insufficient radiation/
excessive heat loss.
Check actual length of pipe using radiation / heat loss
calculation.
Insufficient flow rate to
zone(s).
Check temperature drop across zone.
Defective zone valve/
zone circulator.
Check operation per manufacturer’s instructions.
Summary of Contents for SL 20-160 G3
Page 75: ...6 3 DIAGRAMS SL 10 85 G3 SL 14 115 G3 SL 20 160 G3 SL 30 199 G3 MODULATING GAS BOILERS...
Page 77: ...6 5 DIAGRAMS SL 10 85 G3 SL 14 115 G3 SL 20 160 G3 SL 30 199 G3 MODULATING GAS BOILERS...
Page 79: ...6 7 DIAGRAMS SL 10 85 G3 SL 14 115 G3 SL 20 160 G3 SL 30 199 G3 MODULATING GAS BOILERS...
Page 85: ...SERVICE RECORD DATE LICENSED CONTRACTOR DESCRIPTION OF WORK DONE...
Page 86: ...NOTES...
Page 87: ...NOTES...
