IBC Technologies Inc.
49
VFC 15-150 and VFC 45-225
Temperature Problems
Symptom
Diagnosis
Remedy
Insufficient heat.
Operating temperature too
low
increase temperature target
per
Section 2.8
above
Priority parameters or
load configuration
improperly set up.
Review load configuration
parameters as per
Section 2.8
above.
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 1.5
.
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.
Miscellaneous
Symptom
Diagnosis
Remedy
Fumes and High Humidity
Improperly installed
condensate trap
Refer to installation/operation
instructions
Leak in vent piping
Inspect using soap solution
Flue gas leak within
boiler
Visually inspect all
mechanical connections
