Thermostat Wire Termination In Communicating System; Configuring Heat Sections On Air Handler Control - Lennox iComfort Wi-Fi Setup Manual

Thermostat Wire Termination in Communicating System

RSBus
Minimum wire size is 18
gauge
Outdoor Unit
BEST PRACTICES! Keep all communication wiring as far away from house electrical wiring and large electrical appliances as possible (15' [5m] re­
commended).
Maximum total length of all connections on the RSBus is limited to 1500 ft. (450 m). Max. length between components is 300 ft. (90 m).
Communicating systems
thermostat require four thermostat wires between the
thermostat and the furnace/air handler control and four wires
between the outdoor unit and the furnace/air handler control.
When a thermostat cable with more than four wires is used,
the extra wires must be properly connected to avoid electrical
noise. The wires must not be left disconnected.
Use wire nuts to bundle the unused wires at each end of the
cable. A single wire should then be connected to the indoor
unit end of the wire bundle and attached to the "C" terminals as
shown in the diagram above.
This is not an issue in non-communicating systems.
Configuring Heat Sections on Air Handler
Control
IMPORTANT: After electric heat strips are installed, the Air
Handler Control must be manually configured to detect the
number of electric heat sections. (See also 506181-01 for
complete configuration guide.)
This procedure is
CBX32MV-XX-230-6-06 and higher and CBX40UHV (all
models). To configure the heat strips so that they will be
detected by the thermostat:
•
Power must be applied to the air handler but NOT to the
thermostat. Remove thermostat from base plate or
remove wires to thermostat at the air handler.
•
On the air handler control, unit should be in idle mode
(decimal blinks at 1 Hertz—0.5 second ON, 0.5 second
OFF.
507343-01
Note: iComfort S30iComfort Wi-Fi
cable wiring.
Indoor Unit
Controller
Single wire to
terminal C
Unused wires
Figure 17. Thermostat Wire Termination in Communicating System
using the iComfort
applicable only
®
Controls do not require shielded
®
Wi-Fi •
Select field test mode—press and hold the push button
until solid "–" appears; release button. Display will blink.
•
Press the push button and wait for the display LED to
show "H" (capital H), then release the button.
•
The air handler control cycles the indoor blower motor "on"
to the selected heat speed and stages the electric heat
relays "on" and "off" to automatically detect the number of
electric heat sections. The air handler control stores the
number of electric heat sections, then automatically exits
"Field Test Mode".
•
At this point, the iComfort Wi-Fi
strip information stored in the air handler control.
FUSE
XFMR 24V
24 VAC
COM
3 2
6 5
9
8
to the
XFMR LINE
L2
G L2 L1
EARTH
INDOOR BLOWER
SIGNAL
4 5
1 2
PUSHBUTTON
Page 74
Single wire to
terminal C
IComfortiComfort
®
Wi-Fi S30
Unused wires
Smart Hub
®
will now detect the heat
3 AMP
HEAT
HUMIDITROL
1 2 3 4
C DH
COOL HUMIDIFICATION
1 2 3 4 SMART
EVENHEAT
DELAY
1 2 3 4
1
P8
4
BLOWER
ADJUST
ONLY CFM
7
NORM + −
1 2 3 4
L1
A92
INDOOR
INTEGRATED
BLOWER
CONTROL
POWER
6
3
R I + I − C
R I + I −
OUTDOOR UNIT
I + I −
THERMOSTAT
LINK
LED
AUTO
DS
O
L
H
DH
R
C
Y1
Y2
G
W3
W2
W1
OUTDOOR
DISCHARGE
C
AIR SENSOR AIR SENSOR