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4.8 CONVENTIONAL 24VAC THERMOSTAT CONTROL WIRING (-)H2V
The (-)ARL/(-)ASL-series of condensing units allow the installer to use conventional
24VAC control wiring and a conventional thermostat for proper unit operation.
IMPORTANT: The preferred method of unit installation and operation is by the Comfort
2
Control
System™, which allows access to the fault history of the system. This diagnos-
tic information is not available when the (-)ARL/(-)ASL unit is using a conventional ther-
mostat. Reference section 7.1 Comfort Control
Thermostat control wiring requires a minimum of seven (7) wires for proper unit opera-
tion:
R – 24VAC
C – 24VAC common
G – Constant Fan
W1 – First stage electric heat
W2 – Second stage electric heat
Y1 – First stage operation
Y2 – Second stage operation
Optional wiring:
ODD – On demand humidification
NOTE: W1 and W2 may be jumpered together to energize all the electric heat when a
call for electric heat is received if warmer supply air is desired.
NOTE: When using 24VAC thermostat control wiring, the serial communicating control
will ignore any inputs to Data wire 1 and Data wire 2.
IMPORTANT: Class 2 low voltage control wire should not be run in conduit with power
wiring and must be separated from power wiring, unless Class 1 wire of proper voltage
rating is used.
Low voltage control wiring should be 18 AWG color-coded (105°C minimum). For
lengths longer than 100 ft., 16 AWG wire should be used.
Low voltage control connections are made by extending wires from top of air handler
using wire nuts.
See wiring diagrams attached to indoor and outdoor sections to be connected
Do not leave excess field control wiring inside unit, pull excess control wire to outside of
unit and provide strain relief for field wiring on inside of cabinet where wiring penetrates
cabinet.
Make sure, after installation, separation of control wiring and power wiring has been
maintained.
2
System™ Control Wiring.
19
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