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Control Installation Location
Locate the control on a vibration-free inside wall in an area having good air circulation. The control should be
located approximately five feet high. The control should be located in an area such that it is not influenced by
the following:
Drafts
■
Dead spots behind doors, in corners,
■
or under cabinets
Cold or hot air from registers
■
Sunlight
■
Wiring Requirements
Each digitally communicating device in the system requires four wire connections:
18 AWG solid wire is recommended.
24VAC Hot (R), 24VAC Common (C), Data 1 (1), and Data 2 (2). The R and C connec-
tions provide a 24VAC power supply that can be shared between the indoor and
outdoor units and the thermostat. The data 1 and data 2 connections provide the
communications bus between the indoor unit, outdoor unit and thermostat. Thus,
the R, C, 1, and 2 terminals must be wired consistently. See the indoor unit and
outdoor unit respective installation manuals for additional wiring details.
Indoor unit to thermostat wiring: Connect a wire between terminal "R" on the
■
thermostat sub base and terminal "R" on the 4-position plug connector for the
indoor unit. Repeat for the C, 1, and 2 terminals.
ComfortNet HiDef Control System
Light from fixtures or other appliance
■
Radiant heat from a fireplace or
■
other heat source
Concealed water pipes (hot or cold)
■
Unconditioned areas behind the control
■
Indoor
Board Terminal
CTK02AA
Connections
24VAC (Hot)
R
R
24VAC
(Common)
C
C
Data 1
1
1
Data 2
2
2
Installation Guide / 3
Outdoor
Board Terminal
Connections
R
C
1
2
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