Troubleshooting Guide - L.B. White Foreman CI230 Manuel Du Propriétaire Et Instructions

30
Foreman Ductable Dual Fuel Indirect-Fired Heater

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 proce-
dures for isolating equipment problems. This guide
is intended for use by a QUALIFIED GAS HEATER
SERVICE PERSON. DO NOT ATTEMPT TO SER-
VICE THESE HEATERS UNLESS 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
identified. Refer to the system 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:
• Line voltage is connected to the heater power
receptacle.
• Line voltage is sent to:
- Volt meter and it display the voltage suppled.
- Selector switch terminal 2
- Main motor relay terminal 2
Owner's Manual • Foreman
- Heater control terminal "L1"
• Selector switch set to heat mode.
- 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 activate.
- CI230, circuit closes on positive pressure
- CI500/CI750, circuit open on positive pressure
• Burner motor perform a 60 second pre-purge.
• Electrode and Gas Valve or Solenoids are energized.
- Ignition occurs
• Limit/Purge LED stop flashing
• After a preset time delay, line voltage is sent from "IND" to
the main motor relay terminal 0.
- CI230, 15 seconds
- CI500/CI750, 30 seconds
• Main motor relay closes, and the blower motor is
energized.
- Main motor LED comes ON
• Thermostat opens once heat demand is satisfied.
- Thermostat LED OFF
- Heater control shut off burner
• Blower motor continue to operate (post-purge).
- 180 seconds (CI230)
- 90 seconds (CI500 / CI750)
- Limit/Purge LED Flashes
• After the post purge, the heater control de-energized the
blower motor.
- Limit LED OFF
- Main motor LED OFF