Troubleshooting Guide - L.B. White Foreman CI500 Mode D'emploi

Troubleshooting Guide

READ THIS ENTIRE SECTION
BEFORE BEGINNING 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
procedures for isolating equipment problems.
This guide is intended for use by a QUALIFIED
GAS HEATER SERVICE PERSON. DO NOT
ATTEMPT TO SERVICE THESE HEATERS UN-
LESS YOU HAVE BEEN PROPERLY TRAINED.
TEST EQUIPMENT REQUIRED:
• 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
Before Starting:
• Visually inspect equipment for apparent damage.
• Check all wiring for loose connections and worn
insulation.
Components should be replaced only after each
step has been completed and replacement is
suggested. Refer to the Servicing sections as
necessary to obtain information on disassembly
and replacement procedures of the component
once the problem is identifi ed. Refer to the sys-
tem operation sequence in this section to gain an
understanding as to how the equipment operates
during a call for heat. Understanding the sequence
of operation of the ignition module and related
components is essential as it will relate directly to
problem solving provided by the charts.
OPERATION SEQUENCE:
• Power cord connected to line voltage.
• Line voltage is sent to:
- Selector switch terminal 2
- Main motor relay terminal 2
- Heater control terminal "L1"
Foreman Ductable Dual Fuel Indirect-Fired Heater
Owner's Manual • Foreman
• Selector switch set to heat mode.
- Power LED activated indicating heater is receiving
main power supply.
- Line voltage sent to thermostat outlet.
• Thermostat calls for heat or Thermostat switch set to
manual.
- Thermostat selector switch sends voltage to terminal
"W" of heater control.
- Thermostat LED activated indicating a call for heat.
- Line voltage is sent to burner control from "PSO" on
heater control through limit switches.
- Line voltage returned to "PSI" on heater control.
- Burner control performs internal components test.
- Line voltage is sent to burner motor.
- Limit/Purge LED Flashes
• Pressure switch circuit opens on positive pressure
build-up.
• 60 seconds after Burner control receives power.
- Ignition occurs
- Limit/Purge LED stop fl ashing
• 30 second after ignition occurred, line voltage is sent
from "IND" to main motor relay terminal 0.
- Relay closes, Main motor is energized.
- Main motor LED comes on.
• Thermostat opens once heat demand is satisfi ed.
- Thermostat LED off
- Heater control shut off burner.
- Main motor continue to receive line voltage (post-
purge) for 90 seconds.
- Limit/Purge LED fl ashes
• After 90 seconds, heater control de-enrgized main
motor
- Limit/Purge LED off
- Main motor LED off
DIAGNOSTICS
The burner controller features diagnostics which identify
the cause of malfunction in the heater.
To use the feature, wait at least 10 seconds after the
heater stops operating. Press and hold the reset button
for more than 3 seconds. A yellow light pulse will indicate
to you the operation is completed. Release the button
once the yellow light pulses. The control box will generate
a sequence of pulses (1 second apart) to identify the
malfunction that occurred.
The controller will only provide the diagnostics when the
selector switch is set to HEAT
DO NOT leave the heater in diagnostic mode once
diagnosis has been determined. The main motor will
restart after 90 seconds and will remain ON until power is
removed.
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