Specifications

Manual 2100-590C
Page 21 of 67
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).
17. THERMOSTATS
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.
“Y1” terminal is the compressor 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.
“W1” terminal is the 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:
460 Volt Units
All models are equipped with single primary voltage
transformers and no rewiring is required.
TABLE 3
THERMOSTAT WIRE SIZE
FIGURE 10
INSTALLATION OF FLEXIBLE CONDUIT
TABLE 4
WALL THERMOSTAT
Direct Digital Controls (DDC)
For total and proper control using DDC, a total of 5
controlled outputs are required (4 if no ventilation is
installed).
LOW VOLTAGE CONNECTIONS FOR DDC CONTROL
Fan Only Energize G
Cooling Mode Energize G, Y1
Heating Mode Energize W1
Ventilation Energize G, A
Thermostat Predominant Features
8403-057
TH3110D1040
1 Stage Cool; 1 Stage Heat
System: heat-off-cool Fan: on-auto
Electronic Non-Programmable
8403-058
TH5220D1151
2 Stage Cool; 2 Stage Heat
Electronic Non-Programmable
HP or Conventional
Auto or Manual changeover
8403-060
1120-445
3 Stage Cool; 3 Stage Heat
Programmable/Non-Programmable Electronic
HP or Conventional
Auto or Manual changeover
Tap Range
240 253 – 206
208 220 – 187
Transformer
VA
FLA Wire Gauge
Maximum
Distance
in Feet
55 2.3
20 gauge
18 gauge
16 gauge
14 gauge
12 gauge
45
60
100
160
250