Lennox SIGNATURE SL280UHV Installation Instructions Manual page 49

SL280UHV, 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
®
Dave Lennox ComfortSense
*Dehumidification blower speed is 70% of COOL speed for all units .
**In Precision mode, ComfortSense
OPERATING SEQUENCE
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 to use for this application − Y2081 4 heat / 2 cool
®
7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.
TABLE 18
Compres-
sor
Status D
24
High
VAC
24
High
VAC
0
Demand High
VAC
24
High
VAC
0
Demand High
VAC
0
Demand High
VAC
®
control
Page 49
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
maintain room humidity
setpoint by allowing the
room space to maintain a
cooler room thermostat
®
control
setpoint**
7000
7000