Lennox SL280V - Page 37

Page 37
TABLE 20
SL280DFV, Non−Communicating Thermostat with Humidity Control Feature and Single−Speed Outdoor Unit
OPERATING
SEQUENCE
SYSTEM DEMAND SYSTEM RESPONSE
System
Condition
Step
Thermostat Demand Relative Humidity
Compressor
Blower
CFM
(COOL)
Comments
Y1 O G
W
1
Status D
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1 On On On Acceptable
24
VAC
High 100%
Compressor and indoor
blower follow thermostat
demand
BASIC MODE (only active on a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable
24
VAC
High 100%
ComfortSense
®
7000
thermostat energizes Y1
and de−energizes D on a
call for de−humidification
Dehumidification
Call
2 On On On Demand
0
VAC
High 70%*
PRECISION MODE (operates independent of a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable
24
VAC
High 100%
Dehumidification mode
begins when humidity is
greater than set point
Dehumidification
call
2 On On On Demand
0
VAC
High 70%*
Dehumidification
call ONLY
1 On On On Demand
0
VAC
High 70%*
ComfortSense
®
7000
thermostat will try to main-
tain room humidity set-
point by allowing the room
space to maintain a cooler
room thermostat set-
point**
Jumpers at indoor unit with a single stage outdoor unit
With Condensing unit − Cut W914 (R to DS) on SureLight
®
board
With Heat Pump − Cut W914 (R to DS) & W951 (R to O) on SureLight
®
board
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.