4. Route wires from disconnect through power wiring
exit provided and into the unit control box correct
location as shown in Figure or Figure .
5. Install the correct size time-delay fuses or circuit
breaker, and make the power supply connections.
Field connections control wiring
1. Route low voltage wiring into bottom of control box
correct location as shown in Figure 10 and Figure
11. Connect low voltage wiring to the appropriate
connections. See to depending on the application.
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 procedure.
4. All field wiring to be in accordance with national
electrical codes (NEC) and local-city codes.
NOTICE
Use a Start Assist Kit for long lineset
applications or in areas of known low voltage
problems.
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 in the thermostat.
Figure 10: Outdoor unit control box (208/230 V single-
phase 30, 36, 42, 48, and 60 models only)
Figure 11: Outdoor unit control box (208/230 V single-
phase 18 and 24 models only)
Installation Manual: R-410A Outdoor Split-System Heat Pump - YH2F, THF2, RHP150 Series32
Johnson Controls Ducted Systems
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