Bard QC Series, Installation Instructions Manual

Page: 22 / 29

Manual 2100-416L
Page
22 of 29
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.
“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 Energize G
1st Cooling Mode Energize Y1, G
2nd Cooling Mode Energize Y1, Y2, G
1st Stage Heating Energize G, W1
2nd Stage Heating Energize G, W1, W2
Ventilation Energize G, 3
Low Voltage Connections for
DDC Control
FIGURE 17
Blower Motor Low Voltage Wire Harness Plug
MIS-1285