CONFIGURATION
SELF TEST
Heat ON Delay (sec.)
Constant Fan Speed
Heat OFF Delay (sec.)
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
180
150
120*
90
25
HEAT*
FAN
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
1
2
3
4
1
2
3
4
*Default
SW1-1
SW1-2
SW1- 3 & 4
60*
Cool Off Delay Setting
The default cool off delay is 90 seconds. If dehumidification control via the thermostat is not desired, the cool off
delay can be changed to 5 seconds by placing a jumper between the Y/Y2 and DHUM thermostat inputs.
Automatic Configuration
50M56U-751 automatically configures its functional operation to match that of the OEM control being replaced
across a variety of Carrier and ICP applications. This automatic configuration feature allows 50M56U-751 to
accept various connections (HPS Input, Inducer Ground, or Not Connected) on Pin 3 of the 11 Pin main harness
connector. See the
Wiring Diagram
for additional details on connections specific to your application
Enter Self-Test immediately after control
power up by:
• Double pressing the “FAULT RECALL” button while
LED rapid flashes green.
NOTE:
Control will terminate Self-Test mode if any
system fault occurs. Control will ignore any active
thermostat calls during Self-Test.
Sequence is as follows:
• LED will flash all stored fault codes five times. If there
are no faults LED will be off for 2 seconds.
• Afterward, the LED will slowly flash code 11 in alternate
colors (
green
,
amber
,
red
) to indicate Self-Test is
active. This will continue until Self-Test is complete.
• Inducer motor will turn ON and continue running until
Self-Test is complete.
• After 15 seconds, the ignitor will turn ON for 15 seconds,
then OFF.
• Blower motor runs at the Fan (SW1-2), Heat, and Cool
speeds respectively for 10 seconds each.
• Blower and Inducer motors turn OFF.
• Self-Test is complete, LED will display solid green to
indicate Standby mode.
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