11
Condensing PV Series
11
Normal Heating Sequence (cont.)
7. Steady state operation.
During steady state operation, the control monitors:
Thermostat temperature sensor
-when the set point temperature is satisfied, the
gas valve is shut down and the blower will post purge for 15 seconds. The control
LED flashes a short flash once every 4 seconds (idle) status code.
Pressure switch / blower temperature switch
-if either switch opens, the pilot
valve and the main valve are both shut down. The blower continues to run for 30
seconds attempting to close the circuit. The control LED flashes 3 times with a 3
second pause.
Flame sensor
-if flame is lost, the pilot & main valves are shut down and the blower
runs for 15 seconds. The control attempts to re-light the pilot 4 times. If
unsuccessful, the blower is shut down and the control proceeds to a 5 minute
lockout. The control re-attempts to light pilot starting at normal heating sequence
#2.
8. Thermostat satisfies. (Control LED flashing once every 4 seconds).
9. Burner off.
10. Blower post purges (15 seconds).
Abnormal Operation
1. Simulated Resistive Device Fault:
a.
If the resistance is greater than 70,000 Ohms-
the gas control immediately
turns off all outputs. The control waits and monitors the resistance for 30
seconds. If the resistance is greater than 65,000 ohms after 30 seconds, the
gas control proceeds to verify resistive delay for 2 minutes and flashes 7
times, then once with a three second pause. This process is repeated 5
times until the control either returns to normal operation or proceeds to
flammable vapor lockout.
b.
If the resistance is below 3000 Ohms-
The gas control immediately turns
off all outputs and proceeds to flash 8 times, then once with a three second
pause. The error self clears if the resistance returns to normal range for at
least 15 seconds.
2. Temperature Sensor Fault:
a.
Temperature sensor detected open circuit
–The gas control immediately
turns off all outputs and proceeds to flash 8 times, then 3 times with a 3
second pause. The error self clears if the fault clears for at least 15 seconds.
b.
Thermal well sensor not reading the same temperature within ±5.5°F
–
The gas control immediately turns off all outputs and proceeds to flash 8
