Wiring - Low Voltage Wiring; Low Voltage Connections; General - Bard I30A1DA Installation Instructions Manual

WIRING – LOW VOLTAGE WIRING
230/208V, 1 PHASE AND 3 PHASE EQUIPMENT
DUAL PRIMARY VOLTAGE TRANSFORMERS
All equipment leaves the factory wired on 240V tap.
For 208V operation, reconnect from 240V to 208V tap.
The acceptable operating voltage range for the 240 and
208V taps are as noted in Table 3.
TABLE 3 – Operating Voltage Range
TAP
240V
208V
NOTE: The voltage should be measured at the field
power connection point in the unit and while the unit
is operating at full load (maximum amperage operating
condition).
The standard unit includes a remote thermostat
connection terminal strip. See Figures 13-18 on pages
23 through 28 for connection diagrams. Compatible
thermostats are listed in Table 4.
TABLE 4 – Wall Thermostats
Thermostat Predominant Features
3 Stage Cool; 3 Stage Heat
8403-060 Programmable/Non-Programmable Electronic
(1120-445) HP or Conventional
Auto or Manual changeover
8403-067
Carbon Dioxide Sensor with LCD for
(CDT-2W40-LCD-
Sensor Readings
RLY)
3 Stage Heat, 3 Stage Cool, Prog/NonProg, HP or
Conv,
CS9B-THO Auto or Manual Changeover, Humidity Sensor w/
dehumidification, Motion Sensor w/ Intelligent
Learning Control, BACnet-compatible
3 Stage Heat, 3 Stage Cool, Prog/NonProg, HP or
Conv,
CS9B-THOC Auto or Manual Changeover, Humidity Sensor w/
dehumidification, CO2 Sensor, Motion Sensor w/
Intelligent Learning Control, BACnet-compatible
3 Stage Heat, 3 Stage Cool, Prog/NonProg, HP or
Conv,
Auto or Manual Changeover, Humidity Sensor
CS9BE-THO
w/ dehumidification, Motion Sensor, Intelligent
Learning Control, BACnet-compatible, Ethernet-
compatible
3 Stage Heat, 3 Stage Cool, Prog/NonProg, HP or
Conv,
Auto or Manual Changeover, Humidity Sensor w/
CS9BE-THOC
dehumidification, CO2 Sensor, Motion Sensor w/
Intelligent Learning Control, BACnet-compatible,
Ethernet-compatible

LOW VOLTAGE CONNECTIONS

These units use a grounded 24 volt AC low voltage circuit.
"G" terminal is the fan input.
"Y1" terminal is the compressor part load input.
RANGE
253 – 216
220 – 187
"Y2" terminal is the compressor full load input.
"R" terminal is 24 VAC hot.
"C" terminal is 24 VAC grounded.
"L" terminal is compressor lockout output. This
terminal is activated on a high or low pressure trip and
condensate overflow trip. This is a 24 VAC output.
"W2" terminal is first stage electric heat (if equipped).
First stage electric heat can be operated simultaneously
with the heat pump operating.
"A" terminal is the ventilation input. This terminal
energizes any factory installed ventilation option.
"W3" terminal is second stage electric heat. When
"W3" terminal is energized, it locks out compressor
operation to limit discharge air temperature and
required branch circuit ampacity.
"D" terminal is the dehumidification mode (on models
so equipped).
NOTE: For total and proper control using DDC, a
minimum of nine controlled outputs are needed when
above 10KW electric heat is employed with ventilation,
a total of eight controlled outputs with below 10KW
electric heat with ventilation, seven controlled outputs
below 10KW electric heat with no ventilation, seven
controlled outputs with no electric heat but with
ventilation, and six controlled outputs with no electric
heat and no ventilation. If dehumidification model and
vent, ten controlled outputs are needed when above
10KW electric heat is employed with ventilation.
LOW VOLTAGE CONNECTIONS FOR DDC CONTROL
Fan Only
Cooling Part Load
Cooling Full Load
Heating with Bank #1 Electric Heat
Only
Emergency Heat
Ventilation
Dehumidification

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.
Energize G
Energize G, Y1
Energize G, Y1, Y2
Energize G, W2
Energize G, W2, W3
Energize A
Energize G, D
Manual 2100-597G
Page 23 of 68