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OPERATION
HEAT MODE
Output
Thermostat - W
Inducer
Pressure Switch
Ignitor
Gas Valve
Flame Sensor
Blower (Heat Speed)
Humidifier (24V)
Humidifier (120V)
EAC
LED
On
Cool On Delay
• Cool blower ON delay is 2 seconds.
Fan & Low Cool
• The constant fan speed (G) and low cool speed
(Y1) are determined by the fan speed tap selected
with dipswitch SW1-2 (heat speed is default).
• There is a 1 second blower ON delay and a 1
second blower OFF delay for a fan only demand.
• Set thermostat to Fan ON for continuous fan.
Dehumidification
NOTE: This feature requires connection to a thermostat
with a dehumidification function (DHUM terminal).
• DHUM input is reverse logic in that presence of a
24V signal = no dehumidify demand, and absence
of a 24V signal = dehumidify demand.
• Dehumidify demand with a Y1 input runs the blower
at the low cool speed selected by dipswitch SW1-2
(heat speed is default).
• Dehumidify demand with a Y / Y2 input runs the
blower at the cool speed for 10 minutes, then
6
15 s
5-21 s
2.8 s
25, *60 s
Amber LED - 42 Flash
reduces the blower speed from cool to low cool
for 10 minutes, then returns to the cool speed for 10
minutes.
• Alternating 10-minute cycles continue for as long as
there is a call for 2
• When the call for cool is satisfied and there is a
dehumidify demand, the blower off delay is reduced
to 5 seconds.
Air Conditioner & Heat Pump
• Systems retrofitted with 50M56U-751 can be paired
with either a 1 or 2 stage air conditioner or heat
pump.
• When paired with a 1-stage unit, connect the Y
output from the thermostat to Y/Y2 input on the
control. For 2-stage units, connect the Y1 output
from the thermostat to the Y1 input on the control
and the Y2 output from the thermostat to the Y/Y2
input on the control.
• 50M56U-751 will provide auxiliary heating during
a heat pump defrost cycle if it receives heat and
cool calls simultaneously (W + any Y).
15 s
90, *120, 150, 180 s
Green LED – Solid On
Stage cooling (Y2).
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