Direct Spark Ignition Sequence Of Operation & Troubleshooting Information - Suburban SW10P Service Training Manual

Suburban DSi Water Heater SeQuence
elaPSeD tiMe FunctiOn tiMe
0
Seconds
15-18
Seconds
20-25
Seconds
Seconds
69-75
Seconds
44-50
Seconds
Varies
SeQuence OF OPeratiOn
The ON/OFF
operating circuit to the Water Heater.
When the thermostat closes power is
applied to the module board. The reset
light will illuminate. The module board
will perform a pre trial for ignition purge
cycle.
TRIAL FOR IGNITION
The reset light turns off. The module
board then simultaneously provides
voltage (10.5-13.5 VDC) to the gas valve
allowing fuel to flow to the burner and
creates a high voltage current through
the electrode wire to the electrode
5-7
creating spark for ignition. As the fuel
exits the burner tube it passes through
the spark at the electrode and ignites.
The electrode is heated by the burner
flame generating a small micro amp
current which travels back through the
electrode and wire to the module board
to prove flame sense.
*If ignition is not successful, the module
board will attempt 2 more trials for
ignition, each trail for ignition will be
preceded by a 15-18 second purge
cycle, during which time the reset light
will be illuminated. If all three trails for
ignition are unsuccessful, the module
board will go into the LOCKOUT mode.
The reset light will remain illuminated
during LOCKOUT.
HEATING CYCLE
Once flame sense is confirmed, the
module board will stop sending the high
voltage current to the electrode and
continue applying voltage to the gas
valve until the thermostat opens or the
power switch is turned off.
switch controls the
16
Fault
• NO RESET LIGHT
• NO IGNITION
• NO SPARK
• GAS VALVE DOESN'T OPEN
• BURNER LIGHTS
MOMENTARILY, THEN GOES
BACK OUT
• DELAYED IGNITION
• LOCKOUT
• NO HOT WATER AT FAUCET
OR WATER NOT HOT
ENOUGH
• WATER TEMPERATURE TOO
HOT
• EXCESSIVE WEEPING FROM
T&P VALVE
• SOOT IN EXHAUST VENT
(back firing)