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 pin 6 of P2 is the fan input. If the climate control option is abandoned and connections are made directly to P2 pin 6 of P2 must be energized for proper operation.

“Y1” terminal or pin 7 of P2 is the compressor input.

“W1” terminal or pin 8 of P2 is the fist stage heat.

“R” terminal or pin 10 of P2 is 24 VAC hot.

“C” terminal or pin 11 of P2 is 24 VAC grounded.

“L” terminal or pin 12 of P2 is compressor lockout output. This terminal is activated on a high or low pressure trip by the electronic heat pump control. This is a 24 VAC output.

“W2” terminal or pin 9 of P2 is second stage heat (if equipped). If the unit is equipped with an optional hot water coil plenum box or electric heat these will be energized by this terminal.

“F” terminal of pin 5 of P2 is the ventilation input. This terminal energizes any factory installed ventilation option.

NOTE: For total and proper control using DDC, a total of 5 controlled outputs are required (4 if no ventilation system is installed).

LOW VOLTAGE CONNECTIONS

FOR DDC CONTROL

Fan Only

Energize G

Cooling Mode

Energize Y1, G

1st Stage Heating

Energize G, W1

2nd State Heating

Energize G, W2

(if employed)

 

Ventilation

Energize G, F

GENERAL

This unit is equipped with a variable speed ECM motor. The motor is designed to maintain rated airflow up to the maximum static allowed. It is important that the blower motor plugs are not plugged in or unplugged while the power is on. Failure to remove power prior to unplugging or plugging in the motor could result in motor failure.

CAUTION

Do not plug in or unplug blower motor

connectors while the power is on.

Failure to do so may result in motor failure.

Manual

2100-522B

Page

21 of 38

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Bard Q60A1, Q30A1, Q36A1, Q42A1, Q24A1, Q48A1 installation instructions LOW Voltage Connections For DDC Control

Q48A1, Q24A1, Q60A1, Q42A1, Q36A1 specifications

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