L.B.White Premier 350 DF Manual Del Usuario E Instrucciones página 25

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
systematic 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
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.
■ Checking all wiring for loose connections and worn
Refer to the system operation sequence in this
section to gain an understanding as to how the
heater operates during a call for heat.
Understanding the sequence of operation is
important as it relates to problem solving.
Four green lights are located next to the selector
switch. Each light will be acitvated in sequence as
that circuit within the heater is verified by the ignition
control. If the circuit is not verified, that respective
light will not be activated. The most common heating
mode problems are identified by a green light being
OFF if a specific fault occurs. However, two other
problems may also occur. See the following.
Premier Ductable Heaters
Identify the specific problem and then refer to the appropriate
troubleshooting flow chart
Heating Mode Problems
Volt meter does not display voltage
Transformer status light not ON.
Air pressure status light not ON.
Gas control status light not ON.
All lights are ON, fan motor runs,
burner does not light
All lights are on, EXCEPT gas valve light.
Fan motor does not run, burner does not light. 31
Heater lights but does not stay lit
Ventilation Mode Problems
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:
• Selector switch is set to HEAT.
- Volt meter activated indicating voltage to heater
• Line voltage is sent to the transformer and to ignition
control (L1).
• Transformer reduces line voltage to 24 volts which is sent to
ignition control.
- Transformer light is activated indicating that ignition
control is receiving 24 volts from transformer.
• Ignition control module sends 24 volts to thermostat switch.
- Thermostat calls for heat or thermostat switch is in the
MANUAL setting
• Thermostat sends 24 volts to ignition control (W).
• Ignition control module performs self safety check.
• Ignition control (PS1) sends 24 volts to air pressure switch.
• Ignition control (IND) sends line voltage to motor relay.
- Motor relay closes.
• Fan motor starts.
• Air pressure switch closes and 24 volts are returned to the
ignition control module (PS2).
- Air pressure switch light is activated indicating that the air
pressure circuit is operating properly.
• Ignition control begins ignition trial sequence.
• Ignition control sends high voltage to the igniter electrode.
- Igniter sparks.
• Ignition control (MV) sends 24 volts to the gas control valve
through the high limit switch(es).
- Gas valve light is activated indicating that gas control
valve is receiving 24 volts.
- Gas control valve opens.
- Ignition occurs.
• Igniter continues to spark until flame proving occurs.
Owner's Manual • Premier 350 2.0
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