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4
SMART SYSTEM control module
Figure 4-5 Status Display Screen
OPERATION
1. Once the gas pressure switch(es) are closed, the control turns
on the appropriate pumps (system and boiler pumps for space
heating, DHW pump for DHW). The LWCO must close.
Upon a call for heat, the control turns on the appropriate pumps.
The LWCO must close.
auxiliary limit switch must close.
2. The control turns on power to the louver relay. The louver
proving switch, and blocked drain switch must close.
3. The control starts the prepurge cycle by initiating the blower.
4. The control starts the trial for ignition by firing the spark
electrode and opening the gas valve.
5. If flame is not detected after the sparking ends, the control will
perform a postpurge, then start another prepurge cycle and try
to light the burner again. The control will perform a total of 4
attempts before locking out.
12
Once the LWCO has closed, the
User's Information Manual
™
F I R E T U B E
(continued)
DISPLAY
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