Figure 14: Outdoor unit control box (three-phase -
larger base)
Field connections control wiring
1. Route low voltage wiring into bottom of control
box as shown in Figure 12 or Figure 13. Make low
voltage wiring connections inside the low voltage
box as shown in Figure 15.
2. The complete connection diagram and schematic
wiring label is located on the inside surface of the
unit service access panel.
3. Replace the control box cover removed in Step 2 of
the procedures.
4. All field wiring to be in accordance with national
electrical codes (NEC) or local city codes.
NOTICE
A Start Assist Kit is available and
recommended for long refrigerant piping
applications or in areas of known low voltage
problems. The kit may be required when a
TXV is used (refer to the Tabular Data Sheet to
determine if applicable).
5. Mount the thermostat about 5 ft above the floor,
where it is exposed to normal room air circulation.
Do not place it on an outside wall or where it is
exposed to the radiant effect from exposed glass or
appliances, drafts from outside doors or supply air
grilles.
6. Route the 24 V control wiring (NEC Class 2) from
the outdoor unit to the indoor unit and thermostat.
NOTICE
To eliminate erratic operation, seal the hole in
the wall at the thermostat with permagum or
equivalent to prevent air drafts affecting the
operation of the thermostat.
Field wiring
Figure 15: Typical field wiring (air handler/electrical heat) (single-phase)
Installation Manual: R-410A Outdoor Split-System Air Conditioner18
Johnson Controls Ducted Systems
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