Wiring - Low Voltage Wiring; Thermostats; Thermostat Wire Size; Wall Thermostat - Bard WG Series Installation Instructions Manual

16. WIRING – LOW VOLTAGE WIRING
Low Voltage Connection
These units use a 24 volt AC low voltage circuit.
The "R" terminal is the hot terminal and the "C"
terminal is grounded.
"G" terminal is the fan input.
"Y" terminal is the economizer input (where equipped).
"Y1" terminal is the compressor input.
"Y2" terminal is the compressor staging solenoid input.
"R" terminal is 24 VAC hot.
"C" terminal is 24 VAC grounded.
"A" terminal is the ventilation input. This terminal
energizes any factory or field installed vent option.
"2" terminal is the alarm output.
"W1" terminal is the gas heat input.
230/208 Volt Units
All models are equipped with 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 240V and 208V taps are:
Tap
240
208
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).
460 Volt Units
All models are equipped with single primary voltage
transformers and no rewiring is required.
Direct Digital Controls (DDC)
For total and proper control using DDC, a total of five
controlled outputs are required (four if no ventilation is
installed).
LOW VOLTAGE CONNECTIONS FOR DDC CONTROL
Fan Only
Cooling Mode (Low)
Cooling Mode (High)
Heating Mode
Ventilation
Manual 2100-587J
Page 20 of 59
Range
253 – 206
220 – 187
Energize G
Energize G, Y1
Energize G, Y1, Y2
Energize W1
Energize G, A

17. THERMOSTATS

TABLE 3

Thermostat Wire Size

Transformer VA FLA
50 2.1
TABLE 4

Wall Thermostat

Thermostat
2 stage Cool; 2 stage Heat
8403-058
Electronic Non-Programmable
(TH5220D1151)
Auto or Manual changeover
3 stage Cool; 3 stage Heat
Programmable/Non-Programmable
8403-060
Electronic
(1120-445)
HP or Conventional
Auto or Manual changeover
2 stage Cool; 2 stage Heat
Programmable/Non-Programmable
8403-082 Electronic
(VT8600U5500B) HP or Conventional, Auto or Manual
changeover with Occupancy Sensor,
BACnet
2 stage Cool; 2 stage Heat
Programmable/Non-Programmable
8403-084
Electronic
(VT8600U5000B)
HP or Conventional, Auto or Manual
changeover with BACnet
2 stage Cool; 3 stage Heat – Heat Pump
2 stage Cool; 2 stage Heat – Conventional
8403-090
Programmable/Non-Programmable
(T6 Pro)
Electronic
Auto or Manual changeover
Maximum
Wire Gauge Distance
in Feet
20 gauge 45
18 gauge 60
16 gauge 100
14 gauge 160
12 gauge 250
Predominant Features