3A. ROUTE CONTROL WIRES TING
Install low voltage control wiring from outdoor to indoor unit and from thermostat to indoor unit. All low voltage wiring must enter unit through provided field−installed busing installed in electrical inlet.
Run 24VAC control wires through hole with grommet.
Make 24VAC control wire connections to outdoor control (A175).
NOTE AC control wires inside control box | . | B | ||||||
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separation of field−installed low and high voltage circuits. |
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| WIRE RUN LENGTH | AWG# INSULATION TYPE |
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| LESS THAN 100’ (30 METERS) | 18 | TEMPERATURE RATING |
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| MORE THAN 100’ (30 METERS) | 16 | 35ºC MINIMUM. |
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B. ROUTE CONTROL WIRES TING
CONTROL (A175)
HOLE
A
Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color−coded, with a temperature rating of 95ºF (35ºC) minimum, and solid−core (Class II Rated Wiring). All low voltage wiring must enter unit through provided field−installed busing installed in electrical inlet.
Communicating systems using the icomfortt−enabled thermostat require four thermostat wires between the thermostat and the furnace/air handler con- trol and four wires between the outdoor unit and the furnace/air handler control. When a thermostat cable with more than four wires is used, the extra wires must be properly connected to avoid electrical noise (see illustration below).
Use a wire nut to bundle the four unused wires at each end of the cable. Each bundle should also include an additional wire that should be connected on each end to the C terminal as shown in the figure below.
icomfortt−enabled
icomfortt−enabledIndoor Unit Outdoor Unit
Single Wire To C
Terminal
icomfortt−enabled
thermostat
Single Wire To C Terminal
Unused Wires
Unused Wires
4ROUTE HIGH VOLTAGE AND GROUND WIRES
Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a cutout is located in the bottom of the control box. Connect conduit to the control box using a proper conduit fitting.
WATERTIGHT
CONDUIT FITTING
WATERTIGHT FLEX-
IBLE CONDUIT
TO SERVICE
DISCONNECT BOX
GROUND LUG*
CONTACTOR
CONTROL BOX
ELECTRICAL
INLET (HIGH
VOLTAGE)
WIRING ENTRY POINTS
*Attach field−provided green ground wire to provided ground lug.
NOTE − Grounding wire must be a single, contin- uous wire run from unit ground lug to earth ground. DO NOT splice wire.
ELECTRICAL INLET (CONTROL WIRING LOW VOLTAGE). USE BUSHING PROVIDED IN BAG ASSEMBLY HERE.
ACCESS VIEW
FIGURE 13
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