Trouble Shooting - Columbia EMG-31 120 Instructions Manual

Trouble Shooting the System
See burner manual for trouble shooting burner related problems.
Draft
Trouble: Boiling Noise in Top of Boiler
Source
Air Trapped in Boiler /
System
Trouble: Too Much Heat
Source
Circulator
Thermostat
Flow Valve
Trouble: Insufficient Domestic Hot Water
Source
Operating Control
Coil Heat Exchanger
Take a draft reading; draft
should be -0.02" for
chimney vent
Procedure
Check if boiler / system is
properly vented (purged)
Procedure
Check to see if Aquastat is
operating properly
Check thermostat settings
and calibration
Check to see if flow valve
is operating properly
Procedure
Check operating control
Inspect coils for fouled
surfaces and / or flow
restrictions
10
Down drafts
Insufficient draft
Excessive draft
Causes
Defective float vent
Waterlogged expansion
tank
Manual air vent requires
venting
Improper piping (air
trapped at highest point
of piping)
Causes
Circulator does not stop
running
Thermostat set too high
Thermostat defective
Thermostat out of
calibration
Flow valve dirty & stuck
Flow valve defective
Causes
Setting too low
Flow restriction
Fouled surfaces on heat
exchanger
Install a listed vent cap
Install a listed draft
inducer
Install a listed draft
regulator
Remedy
Replace vent
Drain tank
Open air vent
Install air vent at highest
point of piping
Remedy
Repair
Reset thermostat
Replace thermostat
Recalibrate thermostat
Clean flow valve
Replace flow valve
Remedy
Set operating control to
o
180 F
Remove restriction
Clean heat exchanger
surface