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50D50-842, -843 WIRING
Fig. 1 – Typical hookup for White-Rodgers replacement
with separate flame sense and spark probes
Fig. 2 – Typical hookup for White-Rodgers
replacement with direct flame sense through
single spark/sense probe
lengthof sparkcableshouldbe less than3ft (0.9m) and ratedat 15kV. Thecablemust not run in
continuouscontactwithanymetalsurfaceorsparkvoltageisgreatlyreduced. Useceramicorplasticstandoff
insulatorsasrequired.Ensureburner isgroundeddirectly tomodule forsparkreturnpath.
ALTERNATE
LIMIT
TRANSFORMER THERMOSTAT OR
CONTROLLER
L1 (HOT)
L2
SPARK
PROBE
MV
(GND)
LIMIT
CONTROLLER
FLAME
Gas
Valve
MV VAL TR TH GNDFLYLEAD SPARK
Burner Ground
FLAME
PROBE
(GND)
ALTERNATE
LIMIT
TRANSFORMER THERMOSTAT OR
CONTROLLER
L1 (HOT)
L2
SPARK
PROBE
MV
(GND)
LIMIT
CONTROLLER
FLAME Gas
Valve
MV VAL TR TH GND FLYLEAD SPARK
Burner Ground
(GND)
JUMPER
LINK
Fig. 4 – Typical hookup for White-Rodgers
replacement with direct flame sense through
single spark/sense probe
Fig. 6 – Typical hookup for White-Rodgers
replacement with damper vent and direct flame sense
through single spark/sense probe
Fig. 5 – Typical hookup for White-Rodgers
replacement with damper vent and separate flame-sense and
spark probes
Fig. 3 – Typical hookup for White-Rodgers replacement with
separate flame-sense and spark probes
NOTE: Max length of spark cable should be less than 3ft (0.9m) and rated at 15kV. The cable must not run in
continuous contact with any metal surface or spark voltage is greatly reduced. Use ceramic or plastic standoff
insulators as required. Ensure burner is grounded directly tomodule for spark return path.
ALTERNATE
LIMIT
TRANSFORMER THERMOSTAT OR
CONTROLLER
L1 (HOT)
L2
SPARK
PROBE
MV
PV
LIMIT
CONTROLLER
FLAME
Gas
Valve
MV VAL PV TR TH GNDFLYLEAD SPARK
Burner Ground
FLAME
PROBE
(GND)
(GND)
ALTERNATE
LIMIT
TRANSFORMER THERMOSTAT OR
CONTROLLER
L1 (HOT)
L2
SPARK
PROBE
MV
PV
LIMIT
CONTROLLER
FLAME Gas
Valve
MV VAL PV TR TH GNDFLYLEAD SPARK
Burner Ground
(GND)
(GND)
JUMPER
LINK
ALTERNATE
LIMIT
TRANSFORMER THERMOSTAT OR
CONTROLLER
L1 (HOT)
L2
SPARK
PROBE
MV
PV
LIMIT
CONTROLLER
FLAME
Gas
Valve
MV VAL PV TR TH GNDFLYLEAD SPARK
Burner Ground
FLAME
PROBE
(GND)
(GND)
WHITE
RED
ORANGE
GREY
Damper
Vent Plug
ALTERNATE
LIMIT
TRANSFORMER THERMOSTAT OR
CONTROLLER
L1 (HOT)
L2
SPARK
PROBE
MV
PV
LIMIT
CONTROLLER
FLAME Gas
Valve
MV VAL PV TR TH GNDFLYLEAD SPARK
Burner Ground
(GND)
(GND)
JUMPER
LINK
WHITE
RED
ORANGE
GREY
Damper
Vent Plug
50D50-842 wiring
50D50-843 wiring
189
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