IBC VFC 45-225 User Manual

5-9
TROUBLESHOOTING
VFC 15-150, VFC 45-225 MODULATING GAS BOILERS
5.3.4 Temperature Problems
SYMPTOM DIAGNOSIS REMEDY
INSUFFICIENT HEAT
Operating
temperature too low.
Increase temperature target.
Priority parameters
or load conguration
improperly set up.
Review load conguration 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 CO2 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.
Insufcient radiation/
excessive heat loss.
Check actual length of pipe using radiation / heat
loss calculation.
Insufcient ow rate
to zone(s).
Check temperature drop across zone.
Defective zone valve/
zone circulator.
Check operation per manufacturer’s instructions.

IBC VFC 45-225 Specifications

General

Brand	IBC
Model	VFC 45-225
Category	Boiler
Language	English