4 / Installation Guide ComfortNet HiDef Control System
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Indoor unit to outdoor unit wiring: Connect a wire between terminal “R” on the indoor unit’s 4-position plug and
the terminal “R” on the outdoor unit’s 4-position plug connector. Repeat for the C, 1, and 2 terminals.
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Alternate indoor unit to outdoor unit wiring: In some installations, only two wires may be available for low voltage
control wiring at the outdoor unit. If this is the case, use the existing low voltage control wires and connect the 1 and
2 terminals as shown in the figure below. Follow instructions below to wire the system.
• Install the optional 40 VA transformer (Kit TFK01) in the outdoor unit using the screws provided. Align the holes in
the transformer mounting bracket with the holes in the sheet metal mounting panel and secure with screws.
• Connect one terminated end of the black 22” wire jumper to the 240VAC terminal on the transformer (or 208VAC
terminal if 208VAC system). Connect the othe terminated end of the wire jumper to L1 on the outdoor unit’s
control.
• Connect the red 22” wire jumper to the 240VAC COM terminal on the transformer. Connect the other end of the
wire jumper to L2 on the outdoor unit’s control.
• Connect the terminated end of the red 14” wire jumper to the 24VAC terminal on the transformer. Connect the
other end to the “R” terminal on the included plug connector.
• Connect the terminated end of the blue 14” wire jumper to the 24VAC COM terminal on the transformer. Connect
the other end to the “C” terminal on the included plug connector.
• Dual Fuel Systems: It is highly recommended that the optional 40VA transformer be used in the outdoor unit. See
alternate indoor unit to outdoor unit wiring for transformer wiring instructions.
• To maintain the UL rating on all AC and heat pump models the installing contractor is required to use the low
voltage wiring provided inside the control panel when converting to the communicating control system.
CTK02AA
Indoor
Board Terminal
Connections
Outdoor
Board Terminal
Connections
R
C
1
2
R
C
1
2
1
2
R
C
24VAC (Hot)
24VAC 230V
24VAC
(Common)
Data 1
Data 2
Optional Outdoor 40VA
Transformer (Kit TFK01)
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