TECHNICAL SERVICE DEPARTMENT
Technical Service Bulletin
1-800-432-8373
PowerVent with Electronic Control Sequence of Operations
1622.docx 4
Flame is rectified.
There is always a flame
rectification circuit check
while the main burner is
operating.
If flame is not sensed during
the Trial period, the igniter
turns off, the pilot valve
closes, the control runs the
inducer through Post-purge
then turns off the inducer
and enters Soft Lockout and
flashes the Soft Lockout
error code.
After flame has been
recognized (rectified), the
igniter will turn off.
IF the main burner fails
during heating, the unit will
recycle and attempt ignition.
The control remains in Soft
Lockout for 5 minutes before
automatically responding to
the Demand for Heat.
Control will cycle three
times, then go into a Hard
Lockout.
Water heats to thermostat
setting.
Blower motor thermal
safety switch is monitoring
venting temperatures.
Flammable Vapor (FV)
sensor is monitoring.
ECO is monitoring water
temperature. Trips at 199°F.
Blower motor thermal safety
switch trips at 180°F with
automatic reset at 125°F.
FV Sensor is monitoring
local environment for
presence of flammable
vapors
Water is heated.
Control shuts off all power
to the gas valve.
Blower continues a post
purge to vent excess heat
and combustion gases.
Unit is in stand-by mode.
In stand-by mode, the gas
control constantly monitors
the water temperature via the
thermistor to ensure the
water inside the tank is
within the user-selected
range.
Safeties monitors control
health, other fault conditions
and the local environment
for flammable vapors.
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