Lennox SL280DFV Installation Instructions Manual page 37

SL280DFV, 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 thermostat 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
With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight
®
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
setting.
SYSTEM DEMAND
Thermostat Demand Relative Humidity
W
Y1 O G
1
On On On Acceptable
On On On Acceptable
On On On
On On On Acceptable
On On On
On On On
®
7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room
TABLE 20
Compressor
Status D
24
High
VAC
24
High
VAC
0
Demand High
VAC
24
High
VAC
0
Demand High
VAC
0
Demand High
VAC
®
board
Page 37
SYSTEM RESPONSE
Blower
CFM Comments
(COOL)
Compressor and indoor
100% blower follow thermostat
demand
ComfortSense
100%
thermostat energizes Y1
and de−energizes D on a
70%*
call for de−humidification
100%
Dehumidification mode
begins when humidity is
greater than set point
70%*
ComfortSense
70%* thermostat will try to main-
tain room humidity set-
point by allowing the room
space to maintain a cooler
room thermostat set-
®
board
point**
®
7000
®
7000