AVPTC Service Manual

SERVICING
35
1
2R
C
12RC
12
RC
CTK0*
Thermostat
CT Compatible
Modular Blower
Inte
g
rated Control Module
CT Compatible
AC/HP Integrated
Control Module
40VA Transformer
(
included in
CTK0*** kit)
208/230 VAC
24 VAC
System Wiring Using Three-Wires
between Air Handler and AC / HP
and Four Wires between Air Handler and Thermostat
RECOMMENDED CTK 03/04 WIRING SCHEME:
Three wires should be utilized between the indoor and outdoor
units. For this wiring scheme, two wires for the data lines, 1
and 2 are required and a wire connecting the common “C”
terminals between the indoor and outdoor units. This con-
nects both commons to the same ground potential allowing
for better communication. A 40VA, 208/230 VAC to 24 VAC
transformer must be installed in the outdoor unit to provide
24 VAC power to the outdoor unit’s electronic control. The
transformer is included with the CTK0* kit. See kit instruc-
tions for mounting and wiring instructions. Four wires are
required between the indoor unit and thermostat.
ALTERNATE CTK 03/04 WIRING SCHEME:
Two wires may be utilized between the indoor and outdoor
units. For this wiring scheme, only the data lines, 1 and 2,
are required between the indoor and outdoor units. A 40VA,
208/230 VAC to 24 VAC transformer must be installed in the
outdoor unit to provide 24 VAC power to the outdoor unit’s
electronic control. The “C” 24v common of the outdoor
transformer should be grounded to the equipment (earth)
ground. Not as secure as the third wire but it insures there is
not a floating “C” 24v common. The transformer is included
with the CTK0* kit. See kit instructions for mounting and
wiring instructions. Four wires are required between the
indoor unit and thermostat.
1
2R
C
12RC
12
RC
CTK0*
Thermostat
CT Compatible
Modular Blower
Inte
g
rated Control Module
CT Compatible
AC/HP Integrated
Control Module
40VA Transformer
(
included in
CTK0*** kit)
208/230 VAC
24 VAC
System Wiring Using Two-Wires
between Air Handler and AC / HP
and Four Wires between Air Handler and Thermostat
COMFORTNET™ SYSTEM A DVANCED F EATURES
The ComfortNet™ system permits access to additional
system information, advanced setup features, and advanced
diagnostic/troubleshooting features. These advanced fea-
tures are organized into a menu structure. Refer to the
Installation and Start-Up instructions shipped with your
particular CTKO*** thermostat.