Emerson White-Rodgers 50E47-843 Instrucciones De Instalación página 4

INSTALLATION
INSTALL PROGRAM KEY
The control replaces all listed models with the following
features:
• 120 volt hot surface ignitor
• remote rod flame sense or direct flame sense through ignitor
• one or three ignition tries
• Seven or four second trial for ignition intervals
• Pre-purge of 30 seconds or less
• 60 second inter-purge time
• 17 or 45 second ignitor warm-up times
Six program keys are provided for different applications.
Timings and Retries for each program key are shown in the
OPERATION
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
TROUBLESHOOTING
For proper control operation, the control must be electrically
connected to the gas valve and all the ignitor wiring connec-
tors 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 flash-
4
LED Condition
Green Normal
Solid On
Green Weak flame signal
Rapid Flashing
Red Control in lockout
Rapid Flash Flame sensed when
there should be none
Red Control in lockout
1 Flash Ignition retries exceeded
Red Control in lockout
2 Flash Ignition recycles exceeded
Yellow Internal self check
Solid On
Yellow Improper Polarity
Rapid Flashing
OFF Internal Failure
Red Gas valve miswired or
Solid On Internal error detected
Specifications section of this installation manual. Choose the
proper program key for the application by using the Module
Cross Reference (37-7209). Install the selected program key in
the slot on the left side of the module (see figure 4 on page 3).
If the module you are replacing is not listed in the Cross
Reference, contact the manufacturer of the appliance for a
recommended replacement or retrofit.
After inserting the proper program key, dispose of the
remaining keys to ensure the correct key remains in the
module.
Reversal of gas valve leads or open connection to MV1 and
MV2 may cause control to lockout. See troubleshooting guide
for remedy.
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.
ing 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.