Wiring For Control System Components - Lennox iComfort S30 Installation And Setup Manual

The figure below illustrates the basic Lennox communication control wiring to all system components.
OPTIONAL DISCHARGE AIR
SENSOR (SEE DAS NOTE ON
PAGE 7)
OPTIONAL OUTDOOR AIR
SENSOR (SEE OAS NOTE ON
PAGE 7)
SMART HUB
C
i-
i+
MAG-
MOUNT R
MAXIMUM TOTAL LENGTH OF ALL CONNECTIONS ON THE RSBUS IS LIMITED TO 1500FT.
WIRE GAUGE OF RSBUS WIRE IS 18.
Figure 3. iComfort
DAS NOTE:
Installation of discharge air sensor (DAS) (88K88) must comply with the following requirements:
S
Installed downstream of the heat exchanger or electric heat elements.
S
It must be placed in free airflow, where other accessories (such as humidifiers, UV lights, etc.)
will not interfere with its accuracy.
S
Wiring distance between the IFC or AHC and the discharge air sensor should not exceed 10
feet (3 meters) when wired with 18-gauge thermostat wire.
OAS NOTE
The optional outdoor air (temperature) sensor (OAS) (X2658) wiring distance to either the iComfort
furnace control or iComfort air handler control should not exceed 200 feet when wired with 18-gauge
thermostat wire. Installation of OAS must comply with the following requirements:
S
Sensor wiring must be run to avoid touching or being close to high voltage wiring and light
ballast.
S
Choose a protected outdoor location away from direct sunlight or other heat sources (usually
on the north side of the building).

WIRING FOR CONTROL SYSTEM COMPONENTS

®
iComfort
FURNACE (IFC) OR AIR HANDLER (AHC)
OUTDOOR UNIT
®
Communicating System
Wiring
OPTIONAL DISCHARGE AIR SENSOR
(SEE DAS NOTE ON PAGE 7)
MAG-
MOUNT
®
IComfort
(AC OR HP)
MAXIMUM TOTAL LENGTH OF ALL
CONNECTIONS ON THE RSBUS IS
LIMITED TO 1500FT.
WIRE GAUGE OF RSBUS WIRE IS 18.
Figure 4. iComfort
Non-Communicating Outdoor (HP) System Wiring
S
Ensure that water will neither collect on, nor wash over the sensor.
S
Do not locate the sensor near driveways or similar heat‐absorbing masses which may reflect
stored heat energy onto the sensor and send inaccurate information to the thermostat.
S
Locate the sensor away from attic and soffit vents, or furnace venting pipes.
S
Do not locate the sensor directly above an air conditioner or heat pump.
THERMOSTAT WIRING NOTE
Thermostat control wiring runs are as follows:
S
Maximum total length of all connections on the the system is limited to 1500 feet (450 meters)
total.
S
Maximum length between iComfort controls (indoor to outdoor unit) is 300 feet (90 meters).
7
®
iComfort AIR HANDLER (AHC)
SMART HUB
RSBUS
®
Communicating Indoor /
OPTIONAL OUTDOOR
AIR SENSOR (SEE OAS
NOTE ON PAGE 7)
SETUP NOTES:
CUT Y1-Y2 ON-BOARD
LINK FOR 2-STAGE OUT­
DOOR UNITS (NON-COM­
MUNICATING)
CUT R-O ON-BOARD LINK
FOR OUTDOOR HEAT
PUMP UNITS (NON-COM­
MUNICATING)
24VAC
HEAT PUMP UNIT
- 1 OR 2 STAGE