Troubleshooting Information - L.B. White Oval-U 100 Owner's Manual And Instructions

Troubleshooting
Information
READ THIS ENTIRE SECTION BEFORE BEGIN-
NING TO TROUBLESHOOT PROBLEMS.
WARNING
■ This heater can start at any time.
■ Troubleshooting this system may require
operating the unit with line voltage present and
gas on. Use extreme caution when working on
the heater.
■ Failure to follow this warning may result in
property damage, personal injury or death.
The following troubleshooting guide provides proce-
dures for isolating equipment problems. This guide
is intended for use by a QUALIFIED GAS HEATER
SERVICE PERSON. DO NOT ATTEMPT TO
SERVICE THESE HEATERS UNLESS
YOU HAVE BEEN PROPERLY TRAINED.
TEST EQUIPMENT REQUIRED
The following pieces of test equipment will be
required to troubleshoot this system with minimal time
and effort.
• Digital Multimeter - for measuring AC voltage
and resistance.
• Low Pressure Gauge - for checking inlet and
outlet pressures at the gas control valve against
dataplate rating.
■ Visually inspect equipment for apparent damage.
■ Check all wiring for loose connections and worn
Refer to the system operation sequence in this
section to gain an understanding as to how the equip-
ment operates during a call for heat. Understanding
the sequence of operation of the ignition module and
related components is esential as it will relate directly
to problem solving provided by the flow charts.
The ignition control module is self-diagnostic. The red
LED on the burner box will flash a specific light pat-
tern depending upon the problem which is diagnosed.
To effectively use the flow charts, you must first
identify what the problem is by the light pattern of the
red diagnostic light.
Owner's Manual • Oval-U 100
Oval-U 100
Radiant Tube Heaters
A flashing light indicates a problem.
The flash pattern will be followed by a pause and then a
repeat of the flash pattern until the problem is corrected.
Refer to the tables below to identify what page to refer
to when troubleshooting any problems.
Problems
ON L.E.D. light is not ON, heater is not operating ... 24
L.E.D. diagnostic light is flashing:
A. Rapid Flash .................................................... 25
B. One Time ........................................................ 25
C. Two Times ...................................................... 25
D. Three Times ................................................... 26
E. Four Times ..................................................... 26
F. Five Times ...................................................... 26
Components should be replaced only after each step
has been completed and replacement is suggested
in the flow chart. Refer to the Servicing sections as
necessary to obtain information on disassembly and
replacement procedures of the component once the
problem is identified by the flow chart.
DIRECT IGNITION OPERATION SEQUENCE:
-- Line voltage is sent to ignition control and to
transformer.
-- Transformer reduces line voltage to 24 volts which is
sent to ignition control.
-- Ignition control module performs self safety check.
-- Internal components are tested.
-- Air pressure switch circuit is checked.
-- Ignition control module begins ignition trial sequence.
-- Ignition control module sends 24 volts to air pressure
switch.
-- Ignition control sends line voltage to motor.
-- Fan motor starts.
-- Green LED is illuminated.
-- Air pressure switch contacts close and 24 volts are
returned to the ignition control module.
-- Ignition control module sends high voltage to the
igniter electrode.
-- Igniter sparks.
-- Ignition control module sends 24 volts to the gas
control valve.
-- Gas control valve opens.
-- Ignition occurs.
-- Igniter continues to spark for 4 seconds
-- Ignition spark is cut off.
-- Gas valve stays open.
-- Building controller shuts heater down.
-- Process starts again on a call for heat.
Radiant Tube Heaters
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