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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 electric
al wiring and large electrical appliances as possible (15' [5m] recommended).
Communicating systems using the iComfort Wi-Fi
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
(AHC)
IMPORTANT: After electric heat strips are installed, the Air Handler Control (AHC)
must be manually configured to detect the number of electric heat sections. (SEE
ALSO 506181-01 for complete configuration guide.)
This procedure is applicable only to the 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:
S
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.
S
On the air handler control (AHC), unit should be in idle mode (decimal blinks
at 1 Hertz—0.5 second ON, 0.5 second OFF.
S
Select field test mode—press and hold the push button until solid "–" appears;
release button. Display will blink.
S
Press the push button and wait for the display LED to show "H" (capital H), then
release the button.
S
The AHC cycles the indoor blower motor "on" to the selected heat speed and
stages the electric heat relays "on" and "off" to automatically detect the
507152-01
®
Note: iComfort Wi-Fi
thermostat does not require shielded cable wiring.
Indoor Unit
Controller
Single wire to
terminal C
Unused wires
®
thermostat require four
Single wire to
terminal C
Unused wires
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).
number of electric heat sections. The AHC stores the number of electric heat
sections, then automatically exits "Field Test Mode".
S
At this point, the iComfort Wi-Fi
stored in the AHC.
FUSE
3 AMP
XFMR 24V
24 VAC
COM
3
2
1
P8
4
6
5
9
8
7
XFMR LINE
L2
L1
INDOOR
G
L2 L1
BLOWER
POWER
EARTH
INDOOR BLOWER
SIGNAL
4
6
5
1
2
3
I + I
LINK
PUSHBUTTON
Page 38
®
iComfort Wi-Fi
thermostat
®
will now detect the heat strip information
HEAT
HUMIDITROL
1 2 3 4
C
DH
COOL
HUMIDIFICATION
1 2 3 4
AUTO
SMART
DELAY
EVENHEAT
1 2 3 4
BLOWER
ADJUST
ONLY CFM
NORM
+
1 2 3 4
A92
INTEGRATED
CONTROL
R
I + I
C
OUTDOOR
R
I + I
C
OUTDOOR UNIT
AIR SENSOR
THERMOSTAT
LED
DS
O
L
H
DH
R
C
Y1
Y2
G
W3
W2
W1
DISCHARGE
AIR SENSOR
7/2013
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