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SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
12
SECTION 5: TROUBLESHOOTING
5.1 Sequence 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 sh
ut
off and re-start to verify no faults exist in the
system.
e. After the heating is turned off, the pump will
continue operation for 2 minutes, post purge.
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.