Diagnostics - Brant Radiant Heaters DX2-20-60 User Manual

DX2 Series
Symptom
Thermostat closed, fan doesn't
operate.
Thermostat closed. Fan oper-
ates. Switch does not close.
Thermostat closed. Fan oper-
ates. Pressure switch closes.
No glo-bar igniter.
Thermostat closed. Fan oper-
ates. Pressure switch closed.
Glo-bar energizes. Valve does
not open.
Thermostat closed. Fan and
glo-bar /spark igniter operate.
Ignition occurs, burner cycles
off in less than 60 seconds.
Thermostat closed. Fan and
glo-bar /spark igniter oper-
ate. After 45 seconds glo-bar
shuts off (15 seconds for spark
igniter). No ignition.
Loss of heater efficiency.
Radiant tube leaking burnt
gases.
Condensation.
Tube bowing.
Tube corroding.
Visual inspection of burner
operation not possible.
Stack sooting.
Odor or fumes in space
(normal during first firing and
will subside after initial burn off,
approximately 20 minutes).
Possible Cause
• Blown fuse.
• Faulty thermostat.
• Loose or disconnected wire.
• Faulty fan.
• Loose or disconnected wire.
• Box lid or gasket not in place.
• Plugged pressure switch lines.
• Plugged or restricted exhaust vent.
• Baffle location incorrect.
• Faulty pressure switches.
• Faulty glo-bar igniter.
• Faulty circuit board.
• Disconnect gas valve wires.
• Faulty circuit board.
• Faulty gas valve.
• Low gas pressure.
• Baffle improperly positioned.
• Faulty exhaust pressure switch.
• Restricted flue vent.
• No electrical ground.
• Reversed polarity.
• Closed gas supply.
• Dirty or restricted orifice.
• Faulty valve. Disconnected wire.
• Inlet pressure exceeds 14" W.C.
• Low gas pressure.
• Dirty or restricted orifice.
• Foreign matter inside burner.
• Unit cycles on and off.
• Reflector is dirty.
• Reflector not in place.
• Clogged fan blower.
• Loose tube connections.
• Holes or cracks in radiant tubes.
• Stack length is too long.
• Light gauge flue stack used.
• Contaminated combustion air.
• Insufficient combustion air.
• Over-fired.
• Contaminated combustion air.
• Heater unable to expand properly.
• Contaminated combustion air.
• Dirty or sooted sight glass.
• Unit mounted upside-down.
• Insufficient combustion air.
• Improper gas.
• Dirty fan or blockage.
• Vaporized solvents decomposing when
contacting radiant tubes.
• Evaporation of oils, solvents at floor level.
• Fork lifts.
• Loose tube / vent connections.
43
4.0 Operation
Corrective Action
• Replace.
• Replace.
• Repair as required.
• Lubricate, repair or replace.
• Repair as required.
• Put in place.
• Clean as necessary.
• Remove foreign matter.
• Re-position baffles at vent end.
• Replace only. Do not adjust.
• Replace.
• Replace.
• Repair as required.
• Replace.
• Replace.
• Provide required gas pressure.
• Re-position baffle at vent end.
• Replace.
• Remove foreign matter.
• Connect electrical ground to junction box.
• Repair.
• Open all gas connections.
• Remove. Clean with a soft object.
• Replace or repair.
• Lower inlet pressure.
• Provide required gas pressure.
• Remove. Clean with a soft object.
• Clean as necessary.
• Check previous symptom.
• Clean with aluminum cleaner and
soft cloth.
• Put reflector in place.
• Clean fan blower.
• Ensure that tubes are fully
connected and clamped properly.
• Replace tubes.
• Shorten stack length.
• Minimum of 26 ga. vent pipe required.
• Provide fresh air inlet duct.
• Provide 1 sq. in. of free air for every
5,000 BTU/h of input.
• Check gas pressure and orifice size.
• Provide fresh air inlet duct.
• Remount with flexible inlet or vent
pipe.
• Provide fresh air inlet duct.
• Remove, clean or replace.
• Mount correctly.
• Provide 1 sq. in. of free air for every
5,000 BTU/h of input.
• Correct with proper gas input (or clean).
• Provide proper ventilation.
• Provide proper ventilation.
• Tighten tube clamps to 50-100 ft-lb.
• Seal vent pipes.
•

Diagnostics