Guardian PowerVent Training Manual SVC900; Rev 1
Page 15
Water is heated. Thermostat
and control module shuts
off all power to the unit.
Unit is in stand-by mode.
(The electronic control
checks to see if the water
temp is close to the set
point. If so, it will attempt
to turn the main burner on.
For instance, if the set point
is 120
0
, then after 6 hours,
the control module will
adjust the set point back to
115
0
to see if it can fire off
the main burner.)
In stand-by mode, the
control module constantly
monitors the water
temperature via the
thermistor to ensure the
water inside the tank is
within the user-selected
range.
In addition, the control will
monitor the inputs to look
for any other fault conditions
such as a control health,
false flame or faulty
switches.
Unit is in Stand-by mode Unit monitors control health
and the local environment
for flammable vapors as long
as there is 120 VAC to the
water heater.
False sensing
The blower will turn on
immediately if flame is
sensed when no flame
should be present.
Flame with gas valve off -
If there is proof of flame for
10 seconds with the gas
valve off, the control will go
into lockout. The blower
motor will run during
lockout if there is proof of
flame. If there is proof of
flame for less than 10
seconds, the unit will post-
purge. LED flashes 4/3.
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