AVPTC 14 Series Installation and Operating Instructions

20
20.3 CTK03/04 Four-Wire Indoor, Three-Wire Outdoor Wiring
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 connects 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
instructions for mounting and wiring instructions. Four wires are required between the indoor unit and thermostat.
20.4 CTK03/04 Four-Wire Indoor, Two-Wire Outdoor
Wiring
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 out-
door transformer should be grounded to the equipment
(earth) ground. Not as secure as the third wire but it in-
sures there is not a floating “C” 24v common. The trans-
former is included with the CTK0* kit. See kit instructions
for mounting and wiring instructions. Four wires are re-
quired between the indoor unit and thermostat.
20.5 ComfortNet™ System Advanced Features
The ComfortNet system permits access to additional sys-
tem information, advanced set-up features, and advanced
diagnostic/troubleshooting features. These advanced fea-
tures are organized into a menu structure. See the AIR HAN-
DLER ADVANCED FEATURES MENU section for layout of
menu shortcuts.
20.6 Diagnostics
Accessing the air handler’s diagnostics menu provides ready
access to the last six faults detected by the air handler.
Faults are stored most recent to least recent. Any consecu-
tively repeated fault is stored a maximum of three times.
Example: A clogged return air filter causes the air handler’s
motor to repeatedly entera limiting condition. The control
will only store this fault the first three consecutive times
the fault occurs.
NOTE: It is highly recommended that the fault history be
cleared after performing maintenance or servicing the air
handler.
20.7 Network Troubleshooting
The ComfortNet system is a fully communicating system,
and thus, constitutes a network. Occasionally the need to
troubleshoot the network may arise. The integrated air han-
dler control has some on-board tools that may be used to troubleshoot the network. These tools are: red communications LED, green
receive (Rx) LED, and learn button. Refer to the Communications Troubleshooting Chart at the end of this manual for error codes,
possible causes and corrective actions.
• Red communications LED – Indicates the status of the network. The table below indicates the LED status and the corresponding
potential problem.
• Green receive LED – Indicates network traffic. The
COMMUNICATIONS TROUBLESHOOTING CHART indicates the LED status and
the corresponding potential problem.
• Learn button – Used to reset the network. Depress the button for approximately 2 seconds to reset the network.
1
2R
C
12RC
12
RC
CTK0*
Thermostat
CT Compatible
Modular Blower
Integrated Control Module
CT Compatible
AC/HP Integrated
Control Module
40VA Transformer (included in
CTK0*** kit)
208/230 VAC
24 VAC
CTK03 & CTK04 System Wiring Using Three-Wires
between Air Handler and AC / HP
and Four Wires between Air Handler and Thermostat
Figure 33
1
2R
C
12RC
12
RC
CTK0*
Thermostat
CT Compatible
Modular Blower
Integrated Control Module
CT Compatible
AC/HP Integrated
Control Module
40VA Transformer (included in
CTK0*** kit)
208/230 VAC
24 VAC
CTK03 & CTK04 System Wiring Using Two-Wires
between Air Handler and AC / HP
and Four Wires between Air Handler and Thermostat
Figure 34