Low Voltage Connections; General; Operating Voltage Range; Wall Thermostats - Bard I-TEC Series Installation Instructions Manual

The standard unit includes a remote thermostat
connection terminal strip. See Figures 11 through 16
for connection diagrams. Compatible thermostats are
listed in Table 4.
TABLE 4 – Wall Thermostats
Thermostat Predominant Features
3 Stage Cool; 3 Stage Heat
Programmable/Non-Programmable
8403-060
Electronic
(1120-445)
HP or Conventional
Auto or Manual changeover
8403-067 Carbon Dioxide Sensor with LCD for
(CDT-2W40-LCD-RLY) Sensor Readings
2 stage Cool; 2 stage Heat
Programmable/Non-Programmable
8403-084
Electronic
(VT8600U5000B)
HP or Conventional, Auto or Manual
changeover with BACnet
3 Stage Heat, 3 Stage Cool, Prog/
NonProg, HP or Conv,
Auto or Manual Changeover, Humidity
CS9B-THO
Sensor w/dehumidification, Motion
Sensor w/Intelligent Learning Control,
BACnet-compatible
3 Stage Heat, 3 Stage Cool, Prog/
NonProg, HP or Conv,
Auto or Manual Changeover, Humidity
CS9B-THOC
Sensor w/dehumidification, CO
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
CS9BE-THO Sensor 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
CS9BE-THOC Sensor w/ dehumidification, CO
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.
"Y2" terminal is the compressor full load input.
"B/W1" terminal is the reversing valve input.
The reversing valve must be energized for heating mode.
"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 by the electronic heat pump
control. 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.
NOTE: For total and proper control using DDC,
a minimum of 9 controlled outputs are needed
when above 10KW Electric Heat is employed with
ventilation, a total of 8 controlled outputs with below
10KW Electric Heat with Ventilation, 7 controlled
outputs below 10KW Electric Heat with no ventilation,
7 controlled outputs with no Electric Heat, but with
ventilation, and 6 controlled outputs with no electric
heat and no ventilation. If Dehumidification Model &
Vent, 10 controlled outputs are needed when above
10KW Electric Heat is employed with ventilation.
LOW VOLTAGE CONNECTIONS FOR DDC CONTROL
Fan Only
Cooling Part Load
2
Cooling Full Load
HP Heating Part Load
HP Heating Full Load
HP Heating Full Load + Electric Heat
(up to 10KW)
Heating with Bank #1 Electric Heat Only
Emergency Heat (Heat pump operation
is negated for this condition)
Ventilation

GENERAL

2
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.
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, Y1, B/W1
Energize G, Y1, Y2, B/W1
Energize G, Y1, Y2, B/W1, W2
Energize G, W2
Energize G, W2, W3
Energize A
CAUTION
Manual 2100-578L
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