Bard QW2S1, QW4S1, QW3S1, QW5S1 installation instructions LOW Voltage Connections for DDC Control

Models: QW5S1 QW3S1 QW2S1 QW4S1

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LOW VOLTAGE CONNECTIONS

The “R” terminal is the 24 VAC hot terminal and is supplied through Pin #10 of Plug P2.

The “C” terminal is the 24 VAC common/grounded terminal and feeds through Pin #11 of Plug P2.

The “G” terminal is the indoor blower input signal and feeds through Pin #6 of Plug P2.

The “Y1” terminal is the compressor starting signal and feeds through Pin #7 of Plug P2.

The “Y2” terminal is the compressor staging solenoid signal and feeds through Pin #4 of Plug P2.

The “O” terminal is the reversing valve signal and feeds through Pin #8 of Plug P2.

The “A” terminal is the ventilation demand signal and outputs a signal for ventilation during occupied programming conditions, and feeds through Pin #5 of Plug P2.

The “W2” terminal is the electric heat signal and feeds through Pin #9 of Plug P2.

The “W1/E” terminal is the emergency heat signal and feeds through Pin #3 of Plug P2.

The “L” terminal is used as an input terminal when a CS2000 infrared occupancy device is used. It feeds through Pin #12 of Plug P2.

The “D” terminal is used only of dehumidification models and feeds through Pin #1 of Plug P2.

LOW VOLTAGE CONNECTIONS FOR

DDC CONTROL

Fan Only

Energize G

Ventilation

Energize G, A (any mode of operation)

Part Load Cooling

Energize G, Y1, O

Full Load Cooling

Energize G, Y1, Y2, O

Part Load HP Heating

Energize G, Y1

Full Load HP Heating

Energize G, Y1, Y2

Electric Heat

Energize G, W2

Dehumidification

Energize G, D, O

FIGURE 13

BLOWER MOTOR LOW VOLTAGE

WIRE HARNESS PLUG

MIS-1285

Manual

2100-532B

Page

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Page 19
Image 19
Bard QW2S1, QW4S1, QW3S1, QW5S1 LOW Voltage Connections for DDC Control, Blower Motor LOW Voltage Wire Harness Plug