SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
SECTION 5: TROUBLESHOOTING
DANGER
Electrical Shock Hazard
Disconnect electric before service or maintenance.
More than one disconnect switch may be required to disconnect electric to the unit.
Failure to follow these instructions can result in death or electrical shock.
WARNING
Explosion Hazard
Turn off gas supply to equipment before service or maintenance.
Failure to follow these instructions can result in death, injury or property damage.
5.1Sequence of Operation
a.On demand for heat from the thermostat, the panel will send power to the pump. The pump will begin operation.
b.Once vacuum is established, the pressure
switch at the pump will close. If the vacuum is not established within 30 seconds the pump will go into lockout (pump LED is flashing).
After one hour of lockout, the system will re- start.
c.The System Control panel sends power to the burners. The burners will go through a 45 second purge and cycle time.
d.Once flame is established, the heater will remain in operation until such time as either the heating is turned off by the thermostat, lockout conditions occur, or after 24 hours of continuous operation. After 24 hours of con-
tinuous operation, the system control will shut off and
e.After the heating is turned off, the pump will continue operation for 2 minutes, post purge.
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