23
Circulator
Check if circulator is operational.
Check if circulator is correct
size.
Check if circulator is up to
speed; check if voltage to
circulator is sufficient.
Thermostat
Check thermostat settings.
Check thermostat location.
Check thermostat calibration.
Flow Valve
Check flow valve for sticking in
partially closed position.
Radiation
Check for air in radiators.
Check to see if radiators are
sized properly.
Boiler
Determine structure heat load.
Piping
Check to see if piping is sized
properly.
Heat
Check heat exchanger for soot or
Exchanger
scale accumulation.
Burner
Check pump pressure with
pressure gauge.
Nozzle
Check nozzle for size and spray
angle.
Check for faulty nozzle.
Coupling worn or broken.
Pump binding.
Circulator motor burned out.
Wiring from operating control
defective.
Operating control defective.
Circulator too small.
Circulator defective.
Insufficient voltage.
Settings too low.
Bad location due to heat build
up.
Out of calibration.
Flow valve not opening fully.
Radiators airbound.
Radiators inadequate.
Boiler too small.
Piping inadequate.
Insufficient heat transfer.
Insufficient pump pressure.
Wrong nozzle installed.
Nozzle underfiring due to
defective nozzle.
Replace coupling.
Replace pump.
Replace circulator motor.
Repair wiring.
Repair or replace operating
control.
Replace with proper circulator.
Repair circulator.
Call utility company.
Increase setting.
Move thermostat to a better
location.
Recalibrate. Level thermostat.
Clean or replace flow valve.
Bleed radiators.
Install adequate radiation.
Additional heating capacity.
Install adequate piping.
Clean heat exchanger.
Increase pressure according to
installer/serviceman labels for
Series I & II boilers.
Install specified nozzle.
Replace nozzle.
SOURCE
PROCEDURE
CAUSES
REMEDY
TROUBLE: INSUFFICIENT HEAT