Manual 2100-631
Page
21 of 53
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).
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.
“2” terminal is the “L” input back to the thermostat if
CCM is tripped.
“3” terminal is the
dehumidification input.
This energizes compressor, blower and 3-way
dehumidification valve.
“W1” terminal is the
heating 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.
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).
FIGURE 10
INSTALLATION OF FLEXIBLE CONDUIT
Low Voltage Connections for DDC Control
Fan Only
Energize G
Cooling Mode
Energize G, Y1
Heating Mode
Energize W1
Ventilation
Energize G, A
Dehumidification
Energize 3
Tap
Range
240
253 – 206
208
220 – 187