Lennox SL280V Installation Instructions Manual page 38

SL280DFV, Non−Communicating Thermostat with Humidity Control Feature and Two−Speed Outdoor Unit
OPERATING
SEQUENCE
System
Step
Condition
NO CALL FOR DEHUMIDIFICATION
Normal Operation −
1
Y1
Normal Operation −
2
Y2
ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING
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
ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING
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 two stage outdoor unit
Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2)
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
*Normal operation first stage cooling blower speed is 70% COOL speed.
**Dehumidification blower speed is, reduced to 70% of COOL.
***In Precision mode, ComfortSense
setting.
SYSTEM DEMAND
Thermostat Demand
W W
Y1 Y2 O G
1 2
On On On
On On On On
On On On
On On On On
On On On
On On On On
On On On On
On On On On
On On On On
On On On
On On On On
On On On On
®
7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room
TABLE 21
Relative Humidity
Compressor
Status D
24
Acceptable
VAC
24
Acceptable High
VAC
24
Acceptable
VAC
0
Demand High
VAC
24
Acceptable
VAC
0
Demand High
VAC
0
Demand High
VAC
24
Acceptable High
VAC
0
Demand High
VAC
24
Acceptable
VAC
0
Demand High
VAC
0
Demand High
VAC
®
board
Page 38
SYSTEM RESPONSE
Blower
CFM
(COOL)
Low 70%*
Compressor and indoor
blower follow thermostat
demand
100%
ComfortSense
Low 70%*
thermostat energizes Y2
and de−energizes D on a
70%**
call for de−humidification
Low 70%*
Dehumidification mode
begins when humidity is
greater than set point
70%**
ComfortSense
thermostat will try to
maintain room humidity
70%** setpoint by allowing the
room space to maintain
a cooler room thermostat
setpoint***
ComfortSense
100%
thermostat energizes Y2
and de−energizes D on a
70%**
call for de−humidification
Low 70%*
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
setpoint***
®
control
Comments
®
7000
®
7000
®
7000
®
7000