Emerson White Rodgers 50E47-843 Instrucciones De Instalación página 6

OPERATION OPERATION
OPERATION OPERATION OPERATION
TYPICAL FURNACE INSTALLATION TYPICAL FURNACE INSTALLATION
TYPICAL FURNACE INSTALLATION TYPICAL FURNACE INSTALLATION TYPICAL FURNACE INSTALLATION
In a typical application the 50E47-843 is designed to energize the ignitor and gas valve and monitor the flame sensor. It is a
100% shut off design that locks out the gas valve if the burner does not light within the trial for ignition period. The ignition
sequence begins with a call for heat from the room thermostat. The thermostat applies power to the control. After pre-purge
interval, the ignitor warms up for the selected time. The control energizes the gas valve for the selected trial for ignition
period. If the burner lights within the allowed period the gas valve will remain open until the call for heat is satisfied. During
the trial for ignition period the ignitor is turned off. If the burner does not light, the control will either go into lockout or make
two more ignition retries depending on the options selected. The control can be reset from lockout by cycling the thermostat
to remove power for a minimum of 3 seconds. It includes a system analysis/troubleshooting LED that indicates normal
operation, lockout, weak flame signal or internal control fault.
TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING
For proper control operation, the control must be electrically connected to the gas valve and all the ignitor wiring connectors
plugged in. Gas valves with an electric "ON/OFF" switch must have the switch set to "ON".
The light on the control provides a self-diagnosis indication. If the red light on the module is on continuously, the fault is likely
to be internal to the module. To make sure, interrupt the line or 24 volt thermostat power for a few seconds and then restore.
If the internal fault is indicated again, and flame sensor is not shorted to ground, replace the control. A flashing light indicates
the problem is most likely in the external components or wiring (see chart below). Proceed as follows:
Three visual checks
1) The ignitor will warm up and glow red
2) The main burner flame will ignite
3) The main burner flame will continue to burn after the ignitor is turned off
Troubleshooting the system consists of checking for these three visual indications. The chart on the next page defines the
proper action if any of these indications do not occur.
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LED LED LED
LED LED
Green
Solid On
Green
Rapid Flashing
Red
Rapid Flash
Red
1 Flash Ignition retries exceeded
Red
2 Flash Ignition recycles exceeded
Yellow
Solid On
Yellow
Rapid Flashing
OFF
Red
Solid On
Condition Condition Condition
Condition Condition
Normal
Weak flame signal
Control in lockout
Flame sensed when
there should be none
Control in lockout
Control in lockout
Internal self check
Improper Polarity
Internal Failure
Gas valve miswired or
Internal error detected