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Low Voltage Connections
These units use a grounded 24 volt AC low voltage
circuit.
The "R" terminal is the hot terminal and the "C"
terminal is grounded.
"G" terminal or pins 6 and 1 of P2 are the fan inputs.
Both must be energized for proper fan operation. This
is done automatically in the factory-installed climate
control options. If the climate control option is
abandoned and connections are made directly to P2,
both pins 6 and 1 of P2 must be energized for proper
operation.
"Y1" terminal or pin 7 of P2 is the first stage cooling
input.
"W1" terminal or pin 8 of P2 is the first stage heating
input.
"R" terminal or pin 10 of P2 is 24 VAC hot.
"C" terminal or pin 11 of P2 is 24 VAC grounded.
Manual 2100-416J
Page
20 of 27
"Y2" terminal or pin 12 of P2 is the second stage
cooling input.
"W2" terminal or pin 9 of P2 is second stage heating
output.
"3" terminal of pin 5 of P2 is the ventilation input.
This terminal energizes any factory installed ventilation
option.
Fan Only
1st Cooling Mode
2nd Cooling Mode
1st Stage Heating
2nd Stage Heating
Ventilation
FIGURE 15
Blower Motor Low Voltage
Wire Harness Plug
MIS-1285
Low Voltage Connections for
DDC Control
Energize G
Energize Y1, G
Energize Y1, Y2, G
Energize G, W1
Energize G, W1, W2
Energize G, 3
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