Rheem Guardian PowerVent - SEQUENCE OF OPERATIONS

Guardian PowerVent Training Manual SVC900; Rev 1
Page 10
LOCKOUTS
Internal Lockout - As the control performs its various control checks of the microprocessor’s
function and feedback circuitry it detects a fault condition. The control will respond by de-
energizing all outputs and entering a lockout. The control will lockout if a failure is detected
within the control or it recognizes flame when none should be present. The LED will be turned
Steady On and all other inputs will be turned off. The control must be manually reset by cycling
the line voltage.
External Lockout - The control will lockout if it failed to ignite gas after the specified number of
ignition attempts (3) or detected improper states of safety switch (ECO or vent over temp
switch). The green led will flash a code to indicate the type of failure. (See LED chart). The
blower motor will be turned on if flame is detected and all other outputs will be turned off. The
control must be manually reset by cycling the line voltage.
LFL Lockout (Lower Flammability Limit)
The control shall lockout if it senses the LFL
Fault signals from the sensor. The control shall
respond to LFL fault in the following manner:
• The main valve, pilot valve and spark
igniter shall be de-activated.
• The LED error code for the “Flammable
Vapor present” Condition shall be
displayed.
• The inducer blower shall be energized
for the Post-purge time at the beginning
of lockout.
• The control shall remain in lockout until
external LFL Lockout Reset is resolved.
Once the control detects Lower Flame Limit
(LFL) Fault signal, the control will de-energize
main valve, pilot valve and spark igniter, and
enter the LFL lockout. The inducer blower
shall be energized for the Post-purge time of 30
seconds at the beginning of lockout. The
control shall output the corresponding error
code to diagnostic LED.
If the LFL senses a miswired condition, such as
a shunt or plug, the control shall output the
corresponding code to diagnostic LED.
Figure 3 – Wiring Harness Connection Diagram