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On-Board Links
Note: In communicating systems with a conventional out-
door unit (non-communicating), the on-board clippable
links must be set to properly configure the system.
WARNING
Carefully review all configuration information provided.
Failure to properly set DIP switches, jumpers and on-
board links can result in improper operation!
On-Board Link W914 Dehum or Harmony (R to DS)
On-Board Link W914 Dehum or Harmony (R to DS) On-
board link W914, is a clippable connection between termi-
nals R and DS on the integrated control. W914 must be
cut when the furnace is installed with either the Harmony
III zone control or a thermostat which features humidity
control. If the link is left intact the PMW signal from the
Harmony III control will be blocked and also lead to control
damage
Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit
OPERATING SEQUENCE
System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal Operation
1
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation
1
Dehumidification
2
call
PRECISION MODE (operates independent of a Y1 demand)
Normal Operation
1
Dehumidification
2
Call
Dehumidification
1
Call Only
Jumpers at indoor unit with a single stage outdoor unit. With Condensing unit - Cut
W914 (R to DS) on SureLight® control With Heat Pump - Cut W914 (R to DS) &
W951 (R to O) on SureLight® control
Dave Lennox ComfortSense® 7000 thermostat to use for this application - Y2081 4 heat / 2 cool
*Dehumidification blower speed is 70% of COOL speed for all units .
**In Precision mode, ComfortSense® 7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
OPERATING SEQUENCE
SYSTEM DEMAND
Thermostat Demand
Y1
O
G
W1
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Refer to TABLE 17 for operation sequence in applications
including EL297UHV, a thermostat which features hu-
midity control and a single-speed outdoor unit. TABLE 18
gives the operation sequence in applications with a two-
speed outdoor unit.
On-Board Link W951 Heat Pump (R to O)
On-board link W951 is a clippable connection between
terminals R and O on the integrated control. W951 must
be cut when the furnace is installed in applications which
include a heat pump unit and a thermostat which features
dual fuel use. If the link is left intact, terminal "O" will re-
main energized eliminating the HEAT MODE in the heat
pump.
On-Board Link W915 2 Stage Compr (Y1 to Y2)
On-board link W915 is a clippable connection between
terminals Y1 and Y2 on the integrated control. W915 must
be cut if two-stage cooling will be used. If the Y1 to Y2 link
is not cut the outdoor unit will operate in second-stage
cooling only.
TABLE 17
Relative Humidity
Status
D
24
Acceptable
VAC
24
Acceptable
VAC
Demand
0 VAC
24
Acceptable
VAC
Demand
0 VAC
Demand
0 VAC
Page 59
SYSTEM RESPONSE
Blower
Compre
CFM
ssor
(cool)
Compressor and
High
100%
indoor blower follow
thermostat demand
ComfortSense® 7500
High
100%
thermostat energizes
Y1 and de-energizes
D on a call for de-
High
70%
humidification
Dehumidification
High
100%
mode begins when
humidity is greater
High
70%
than set point
ComfortSense®
7500 thermostat will
try to maintain room
humidity setpoint by
High
70%
allowing the room
space to maintain
a cooler room
thermostat setpoint**
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