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When replacing
Default Settings for 50D50U-843
match S8610U Default Settings
Wires from 50D50U-843
11-pin harness
MV
MV/PV COM
PV
BRN GND
24V
PSW
24V COM
TH-W
C/GND
R
Other Setup Notes:
•
Keep vent damper jumper plug installed on 50D50U-843 if replaced control has it installed
•
When installing 50D50U-843 with this setup, leave 24V terminal on 50D50U-843 unconnected and
insulated (control will receive power from TH-W)
•
To use control with a vent damper, remove vent damper jumper plug and connect damper harness assembly
to vent damper connector on 50D50U-843
•
Once 50D50U-843 receives power with a vent damper connected, an internal circuit will open (non-reversible;
control with the jumper plug will no longer work)
•
If there is no TH-W terminal on the replaced control, connect the wire from 24V or 25V (2) terminal on old
control to TH-W on new 50D50U-843 and leave 24V on 50D50U-843 unconnected and insulated
•
For systems with air proving switch (APS), connect output of APS to TH-W on 50D50U-843
•
If default settings are not being used on replaced S8610U, match correct settings to 50D50U-843 through
White-Rodgers Connect App or 7-segment Configuration Menu
•
Follow all safety guidelines on page 1 and directions under MOUNTING AND WIRING DIAGRAM on page 4
Sequence of operation when
CONFIGURABLE
STANDBY,
CALL FOR HEAT
RECEIVED FROM
NOT
THERMOSTAT
POWERED
IF CONFIGURED, BEGIN
PREPURGE
SPARK
OPEN MAIN
OFF
GAS VALVE
CLOSE VENT DAMPER
Honeywell S8610U – Intermittent Pilot (IP)
Factory unit wires removed
from replaced control
50D50U-843
MODULE
RECEIVES POWER,
RUNS SELF CHECK
TRIAL FOR
IGNITION
RUN
CLOSE MAIN GAS VALVE AND PILOT GAS VALVE
SENSE terminal on 50D50U-843
Existing Control Being Replaced
is configured to replace S8610U:
DAMPER
CONNECTED?
NO
5 MINUTE RETRY DELAY
SPARK
OPEN PILOT
ON
GAS VALVE
NO
NO
CALL FOR
FLAME
HEAT ENDS?
LOST?
YES
Spade Spark
Terminal on
50D50U-843
Vent Damper
Connector on
50D50U-843
VENT DAMPER ERROR (AFTER 60 SECONDS)
NO
YES
DAMPER
FUSE OPENS
UPON FIRST
HEAT CALL
YES
SPARK OFF
NO
FLAME
PROVED?
YES
YES
CLOSE MAIN GAS
VALVE AND PILOT
GAS VALVE
DAMPER
OPEN?
CLOSE
PILOT
VALVE
5
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